74LV123
Dual retriggerable monostable
multivibrator with reset
Product data
Supersedes data of 1998 Apr 20 2003 Mar 13
INTEGRATED CIRCUITS
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2
2003 Mar 13
FEATURES
•Optimized for Low Voltage applications: 1.0 V to 5.5 V
•Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V
•Typical VOLP (output ground bounce) < 0.8 V @ VCC = 3.3 V,
Tamb = 25 °C
•Typical VOHV (output VOH undershoot) > 2 V @ VCC = 3.3 V,
Tamb = 25 °C
•DC triggered from active HIGH or active LOW inputs
•Retriggerable for very long pulses up to 100% duty factor
•Direct reset terminates output pulses
•Schmitt-trigger action on all inputs except for the reset input
•Output capability: standard (except for nREXT/CEXT)
•ICC category: MSI
DESCRIPTION
The 74LV123 is a low-voltage Si-gate CMOS device and is pin and
function compatible with the 74HC/HCT123.
The 74LV123 is a dual retriggerable monostable multivibrator with
output pulse width control by three methods. The basic pulse time is
programmed by selection of an external resistor (REXT) and
capacitor (CEXT). They are normally connected as shown in
Figure 1. Once triggered, the basic output pulse width may be
extended by retriggering the gated active LOW-going edge input
(nA) or the active HIGH-going edge input (nB). By repeating this
process, the output pulse period (nQ = HIGH, nQ = LOW) can be
made as long as desired. Alternatively, an output delay can be
terminated at any time by a LOW-going edge on input nRD, which
also inhibits the triggering. Figures 1 and 2 illustrate pulse control by
retriggering and early reset. The basic output pulse width is essentially
determined by the values of the external timing components REXT
and CEXT. For pulse width when CEXT < 10000 pF, see Figure 5.
When CEXT > 10,000 pF, the typical output pulse width is defined
as: tW = 0.45 × REXT × CEXT (typ.), where tW= pulse width in ns;
REXT = external resistor in kΩ; and CEXT = external capacitor in pF.
Schmitt-trigger action in the nA and nB inputs makes the circuit
highly tolerant of slower input rise and fall times.
QUICK REFERENCE DATA
GND = 0V ; Tamb = 25°C; tr = tf v2.5 ns
SYMBOL PARAMETER CONDITIONS TYPICAL UNIT
tPHL/tPLH Propagation delay
nA, nB to nQ, nQ
nRD to nQ, nQ
CL = 15 pF
VCC = 3.3 V
REXT = 5 kΩ
CEXT = 0 pF 25
20 ns
ns
CIInput capacitance 3.5 pF
CPD Power dissipation capacitance per monost-
able VCC = 3.3V, VI = GND to VCC160 pF
NOTES:
1. CPD is used to determine the dynamic power dissipation (PD in µW)
PD = CPD × VCC2 × fi × N + Σ (CL × VCC2 × fo) where:
N = number of outputs switching;
fi = input frequency in MHz; CL = output load capacitance in pF;
fo = output frequency in MHz; VCC = supply voltage in V ;
Σ (CL × VCC2 × fo) = sum of the outputs.
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE ORDER CODE PKG. DWG. #
16-Pin Plastic DIL –40°C to +125°C 74LV123N SOT38-1
16-Pin Plastic SO –40°C to +125°C 74LV123D SOT109-1
16-Pin Plastic SSOP Type II –40°C to +125°C 74LV123DB SOT338-1
16-Pin Plastic TSSOP Type I –40°C to +125°C 74LV123PW SOT403-1
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 3
PIN CONFIGURATION
14
13
12
11
10
9
7
6
5
4
3
2
1
GND
VCC
1A
1B
1RD
1Q
2Q
8
15
16
2CEXT
2REXT/CEXT
1REXT/CEXT
1CEXT
1Q
2Q
2RD
2B
2A
SV00096
PIN DESCRIPTION
PIN
NUMBER SYMBOL FUNCTION
1,9 1A, 2A T rigger inputs
(negative-edge triggered)
2,10 1B, 2B T rigger inputs
(positive-edge triggered)
3,11 1RD, 2RDDirect reset LOW and trigger action at
positive edge
4, 12 1Q, 2Q Outputs (active LOW)
7 2REXT/CEXT External resistor/capacitor connection
8 GND Ground (0V)
13, 5 1Q, 2Q Outputs (active HIGH)
14, 6 1CEXT,
2CEXT External capacitor connection
15 1REXT/CEXT External resistor/capacitor connection
16 VCC Positive supply voltage
LOGIC SYMBOL (IEEE/IEC)
CX
RCX
&
R
14
15
1
2
3
13
4
CX
RCX
&
R
6
7
9
10
11
5
12
SV00098
LOGIC SYMBOL
1
9
2
10
3
11
14
6
15
7
13
5
4
12
1A
2A
1B
2B
1RD
2RD
1CEXT
2CEXT
1REXT/CEXT
2REXT/CEXT
1Q
2Q
1Q
2Q
S
Q
Q
RD
T
SV00097
FUNCTIONAL DIAGRAM
1
9
2
10
3
11
14
6
15
7
13
5
4
12
1A
2A
1B
2B
1RD
2RD
1CEXT
2CEXT
1REXT/CEXT
2REXT/CEXT
1Q
2Q
1Q
2Q
S
Q
Q
RD
T
SV00099
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 4
LOGIC DIAGRAM
R
nREXT/CEXT
VCC
Q
Q
RD
RR
CL
CL
VCC CL
CLCL
R
A
B
SV00100
VCC
It is recommended that Pin 6 (2CEXT) and Pin 14 (1CEXT) by externally grounded to Pin 8 (GND)
FUNCTION TABLE
INPUTS OUTPUTS
nRDnA nB nQ nQ
L X X L H
X H X L * H *
X X L L * H *
H L ↑
H↓H
↑L H
NOTES:
* If the monostable was triggered before this condition was
established, the pulse will continue as programmed.
H = HIGH voltage level
L = LOW voltage level
X = don’t care
↑ = LOW-to-HIGH transition
↓ = HIGH-to-LOW transition
= one HIGH level output pulse
= one LOW level output pulse
VCC
REXT
CEXT
to nCEXT
(pin 14 or 6) to nREXT/CEXT
(pin 15 or 7)
SV00101
Figure 1. Timing component connection
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 5
RECOMMENDED OPERATING CONDITIONS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT
VCC DC supply voltage See Note11.0 3.3 5.5 V
VIInput voltage 0 – VCC V
VOOutput voltage 0 – VCC V
Tamb Operating ambient temperature range in free air See DC and AC characteristics –40
–40 +85
+125 °C
VCC = 1.0 V to 2.0 V – – 500 ns/V
t t
Input rise and fall times except for Schmitt-trigger VCC = 2.0 V to 2.7 V – – 200 ns/V
t
r,
t
f
gg
inputs VCC = 2.7 V to 3.6 V – – 100 ns/V
VCC = 3.6 V to 5.5 V – – 50 ns/V
NOTE:
1. The LV is guaranteed to function down to VCC = 1.0 V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2 V to
VCC = 5.5 V.
ABSOLUTE MAXIMUM RATINGS1, 2
In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0 V).
SYMBOL PARAMETER CONDITIONS RATING UNIT
VCC DC supply voltage –0.5 to +7.0 V
±IIK DC input diode current VI < –0.5 V or VI > VCC + 0.5 V 20 mA
±IOK DC output diode current VO < –0.5 V or VO > VCC + 0.5 V 50 mA
±IODC output source or sink current (standard
outputs) –0.5 V < VO < VCC + 0.5 V 25 mA
±IGND,
±ICC DC VCC or GND current for types with standard
outputs 50 mA
Tstg Storage temperature range –65 to +150 °C
PTOT
Power dissipation per package
– plastic DIL
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
for temperature range: –40 °C to +125 °C
above +70 °C derate linearly with 12 mW/K
above +70 °C derate linearly with 8 mW/K
above +60 °C derate linearly with 5.5 mW/K
750
500
500 mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 6
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions. Voltages are referenced to GND (ground = 0 V). LIMITS
SYMBOL PARAMETER TEST CONDITIONS –40 °C to +85 °C –40 °C to +125 °CUNIT
MIN TYP1MAX MIN MAX
VCC = 1.2 V 0.9 0.9
V
HIGH level Input VCC = 2.0 V 1.4 1.4
V
V
IH voltage VCC = 2.7 V to 3.6 V 2.0 2.0
V
VCC = 4.5 V to 5.5 V 0.7*VCC 0.7*VCC
VCC = 1.2 V 0.3 0.3
V
LOW level Input VCC = 2.0 V 0.6 0.6
V
V
IL voltage VCC = 2.7 V to 3.6 V 0.8 0.8
V
VCC = 4.5 V to 5.5 V 0.3*VCC 0.3*VCC
VCC = 1.2 V ; VI = VIH or VIL; –IO = 100 µA 1.2
HIGH l l t t
VCC = 2.0 V ; VI = VIH or VIL; –IO = 100 µA 1.8 2.0 1.8
VOH HIGH level output
voltage
;
all out
p
uts
VCC = 2.7 V ; VI = VIH or VIL; –IO = 100 µA 2.5 2.7 2.5 V
voltage
all
out uts
VCC = 3.0 V ; VI = VIH or VIL; –IO = 100 µA 2.8 3.0 2.8
VCC = 4.5 V ; VI = VIH or VIL; –IO = 100 µA 4.3 4.5 4.3
VO
HIGH level output
voltage
;VCC = 3.0 V ; VI = VIH or VIL; –IO = 6 mA 2.40 2.82 2.20
V
V
OH
voltage;
STANDARD outputs VCC = 4.5 V ; VI = VIH or VIL; –IO = 12 mA 3.60 4.20 3.50
V
VCC = 1.2 V ; VI = VIH or VIL; IO = 100 µA 0
LOW l l t t
VCC = 2.0 V ; VI = VIH or VIL; IO = 100 µA 0 0.2 0.2
VOL LOW level output
voltage
;
all out
p
uts
VCC = 2.7 V ; VI = VIH or VIL; IO = 100 µA 0 0.2 0.2 V
voltage
all
out uts
VCC = 3.0 V ; VI = VIH or VIL; IO = 100 µA 0 0.2 0.2
VCC = 4.5 V ; VI = VIH or VIL; IO = 100 µA 0 0.2 0.2
VO
LOW level output
voltage
;VCC = 3.0 V ; VI = VIH or VIL; IO = 6 mA 0.25 0.40 0.50
V
V
OL
voltage;
STANDARD outputs VCC = 4.5 V ; VI = VIH or VIL; IO = 12 mA 0.35 0.55 0.65
V
IIInput leakage
current VCC = 5.5 V ; VI = VCC or GND 1.0 1.0 µA
ICC Quiescent supply
current; MSI VCC = 5.5 V ; VI = VCC or GND; IO = 0 20.0 160 µA
∆ICC Additional quiescent
supply current VCC = 2.7 V to 3.6 V ; V I = VCC – 0.6 V 500 850 µA
NOTE:
1. All typical values are measured at Tamb = 25 °C.
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 7
AC CHARACTERISTICS
GND = 0 V ; tr = tf ≤ 2.5 ns; CL = 50 pF; RL =1 kΩ
CONDITION
LIMITS
SYMBOL PARAMETER WAVEFORM
CONDITION
–40 °C to +85 °C –40 °C to +125 °CUNIT
VCC (V) MIN TYP1MAX MIN MAX
1.2 120
Propagation delay
Fi
g
ure 3 2.0 40 76 92
tPHL
P
ropaga
ti
on
d
e
l
ay
nRD,nA, nB, to nQ
Figure
3
CEXT = 0 pF
R5kΩ
2.7 30 56 68 ns
nRD
,
nA
,
nB
,
to
nQ
R
EXT = 5
k
Ω3.0 to 3.6 25248 57
4.5 to 5.5 18240 46
1.2 120
Propagation delay
Fi
g
ure 3 2.0 40 76 92
tPLH
P
ropaga
ti
on
d
e
l
ay
nRD,nA, nB, to nQ
Figure
3
CEXT = 0 pF
R5kΩ
2.7 30 56 68 ns
nRD
,
nA
,
nB
,
to
nQ
R
EXT = 5
k
Ω3.0 to 3.6 25248 57
4.5 to 5.5 182 40 46
1.2 100
Propagation delay
Fi
g
ure 3 2.0 30 57 68
tPHL
P
ropaga
ti
on
d
e
l
ay
nRDto nQ (reset)
Figure
3
CEXT = 0 pF
R5kΩ
2.7 23 43 51 ns
nRD
to
nQ
(reset)
R
EXT = 5
k
Ω3.0 to 3.6 20238 45
4.5 to 5.5 14231 36
1.2 100
Propagation delay
Fi
g
ure 3 2.0 30 57 68
tPLH
P
ropaga
ti
on
d
e
l
ay
nRDto nQ (reset)
Figure
3
CEXT = 0 pF
R5kΩ
2.7 23 43 51 ns
nRD
to
nQ
(reset)
R
EXT = 5
k
Ω3.0 to 3.6 20238 45
4.5 to 5.5 14231 36
2.0 30 5 40
tW
T rigger pulse width
Figure 3
2.7 25 3.5 30
ns
t
W
gg
nA = LOW
Figure
3
3.0 to 3.6 20 3.0 225
ns
4.5 to 5.5 15 2.5 220
2.0 30 13 40
tW
T rigger pulse width
Figure 3
2.7 25 8 30
ns
t
W
gg
nB = HIGH
Figure
3
3.0 to 3.6 20 7225
ns
4.5 to 5.5 15 5220
2.0 35 6 45
tW
Reset pulse width
Figure 2
2.7 30 5 40
ns
t
WnRD = LOW
Figure
2
3.0 to 3.6 25 4230
ns
4.5 to 5.5 20 3225
2.0 470
tW
Output pulse width
nQ = HIGH
Figures 1, 2
CEXT = 100 nF
2.7 460
µs
t
W
nQ
=
HIGH
nQ = LOW
C
EXT =
100
nF
R
EXT
= 10 kΩ3.0 to 3.6 4502
µs
Q
EXT
4.5 to 5.5 4302
2.0 100
tW
Output pulse width
nQ = HIGH
Figures 1, 2
CEXT =0
p
F
2.7 90
ns
t
W
nQ
=
HIGH
nQ = LOW
C
EXT =
0
F
R
EXT
= 5 kΩ3.0 to 3.6 802
ns
Q
EXT
4.5 to 5.5 702
2.0 70
tt
Retrigger time Figure 1
CEXT =0
p
F
2.7 55
ns
t
rt
gg
nA, nB
C
EXT =
0
F
R
EXT
= 5 kΩ3.0 to 3.6 452
ns
EXT
4.5 to 5.5 402
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 8
AC CHARACTERISTICS (Continued)
GND = 0 V ; tr = tf ≤ 2.5 ns; CL = 50 pF; RL = 1 kΩ
CONDITION
LIMITS
SYMBOL PARAMETER WAVEFORM
CONDITION
–40 °C to +85 °C –40 °C to +125 °CUNIT
VCC (V) MIN TYP1MAX MIN MAX
1.2 10 1000
2.0 5 1000
REXT External timing resistor Figure 5 2.7 3 1000 kΩ
3.0 to 3.6 2 1000
4.5 to 5.5 2 1000
3
1.2
3
2.0
CEXT External timing capacitor Figure 5
3
2.7 No limits pF
3.0 to 3.6
4.5 to 5.5
NOTES:
1. Unless otherwise stated, all typical values are at Tamb = 25 °C.
2. Typical value measured at VCC = 3.3 V.
3. Typical value measured at VCC = 5.0 V.
4. For other REXT and CEXT combinations see Figure 5.
if CEXT > 10 nF, the next formula is valid:
tW= K × REXT x CEXT (typ.)
where, tW= output pulse width in ns;
REXT = external resistor in kΩ; CEXT = external capacitor in pF;
K = constant = 0.45 for VCC = 5.0 V and 0.48 for VCC = 2.0 V.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
5. The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT.
The output pulse width will only be extended when the time between the active-going edges of the
trigger pulses meets the minimum retrigger time.
If CEXT > 10 pF, the next formula (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid:
trt = 30 + 0.19R × C0.9 + 13 × R1.05 (typ.)
If CEXT > 10 pF, the next formula (at VCC = 3.0 V) for the set-up time of a retrigger pulse is valid:
trt = 41 + 0.15R × C0.9 × R1.05 (typ.)
where, trt = retrigger time in ns;
CEXT = external capacitor in pF;
REXT = external resistor in kΩ.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.
6. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50 pF.
AC WAVEFORMS
VM = 1.5 V at VCC ≥ 2.7 V; VM = 0.5 VCC at VCC t 2.7 V;
VOL and VOH are the typical output voltage drop that occur with the
output load.
tW
tW
trt
tW
tW
tW
nB INPUT
nA INPUT
nQ OUTPUT
SV00139
Figure 1. Output pulse control using retrigger pulse;
nRD = HIGH.
tW
tW
tW
nB INPUT
nRD INPUT
nQ OUTPUT
SV00140
Figure 2. Output pulse control using reset input nRD;
nA = LOW.
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 9
nB INPUT
(nA LOW)
tW
tW
tPLH
VM
VM
VM
tW
tTLH
tTHL
tPLH
tTHL
tTLH tPLH
tW
tPHL
tPHL
VM
tW
tPLH
nA INPUT
(nB HIGH)
nRD INPUT
Q OUTPUT
Q OUTPUT
SV00197
Figure 3. Input (nA, nB, nRD) to output (nQ, nQ) propagation delays, the output transition times,
and the input and output pulse widths.
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 10
0.8
0.4
0024
VCC (V)
‘K’ factor
SV00185
136
5
Figure 4. HCT typical “K” factor as a function of VCC;
CX = 10 nF; RX = 10 kΩ to 100 kΩ.
0110
2
SV00141
10 103104
102
103
104
105
106
tW
ns
CEXT (pF)
REXT =
100 kW
50 kW
10 kW
2 kW
Figure 5. Typical output pulse width as a function of the
external capacitor values at VCC = 3.3 V and Tamb = 25 °C.
APPLICATION INFORMATION
Power-up considerations
When the monostable is powered-up it may produce an output
pulse, with a pulse width defined by the values of RX and CX. This
output pulse can be eliminated using the circuit shown in Figure 6.
SV00152
RXVCC
A
B
CX
Q
Q
RESET VCC
nCEXT nREXT/CEXT
“123”
Figure 6. Power-up output pulse elimination circuit
Power-down considerations
A large capacitor (CX) may cause problems when powering-down
the monostable due to the energy stored in this capacitor. When a
system containing this device is powered-down or a rapid decrease
of VCC to zero occurs, the monostable may sustain damage, due to
the capacitor discharging through the input protection diodes. To
avoid this possibility, connect a damping diode (DX) preferably a
germanium or Schottky type diode able to withstand large current
surges as shown in Figure 7.
VCC
DX
RX
CX
nREXT/CEXT
SV00154
Figure 7. Power-down protection circuit
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 11
TEST CIRCUIT
PULSE
GENERATOR
RT
Vl
D.U.T.
VO
CLRL= 1 kΩ
Vcc
Test Circuit for Outputs
DEFINITIONS
VCC VI
< 2.7 V
2.7 V to 3.6 V
VCC
2.7 V
TEST
tPLH/tPHL
≥4.5 V VCC
RL = Load resistor
CL = Load capacitance includes jig and probe capacitiance
50 pF
RT = Termination resistance should be equal to ZOUT of pulse generators.
SV00902
Figure 8. Load circuitry for switching times
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 12
DIP16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 13
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 14
SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm SOT338-1
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 15
TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm SOT403-1
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 16
REVISION HISTORY
Rev Date Description
_3 20030313 Product data (9397 750 11244). ECN 853-1911 29490 of 07 February 2003.
Supersedes Product specification of 1998 Apr 20 (9397 750 04418).
Modifications:
•Quick Reference Data: Correct power dissipation formula in Note 1.
•Ordering information: delete “North America”column; rename column from “Outside North America” to
“Order Code”.
•AC characteristics, Note 5 (on page 8): correct CEXT value calculation formula for 5 V operation;
add CEXT value calculation formula for 3.3 V operation.
_2 19980420 Product specification (9397 750 04418). ECN 853-1911 19290 of 20 April 1998.
Supersedes data of 1997 Feb 04.
Philips Semiconductors Product data
74LV123
Dual retriggerable monostable multivibrator
with reset
2003 Mar 13 17
Definitions
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see
the relevant data sheet or data handbook.
Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given
in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no
representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be
expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree
to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes — Philips Semiconductors reserves the right to make changes in the products—including circuits, standard cells, and/or software—described
or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated
via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys
no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent,
copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit
http://www.semiconductors.philips.com. Fax: +31 40 27 24825
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Koninklijke Philips Electronics N.V. 2003
All rights reserved. Printed in U.S.A.
Date of release: 03-03
Document order number: 9397 750 11244
Data sheet status[1]
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Preliminary data
Product data
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status[2] [3]
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Definitions
This data sheet contains data from the objective specification for product development.
Philips Semiconductors reserves the right to change the specification in any manner without notice.
This data sheet contains data from the preliminary specification. Supplementary data will be published
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in
order to improve the design and supply the best possible product.
This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).
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[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
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Philips Semiconductors - PIP - 74LV123; Dual retriggerable monostable multivibrator with reset
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Product Information
74LV123; Dual
retriggerable
monostable
multivibrator with
reset
Information as of 2003-04-22
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General description
The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the
74HC/HCT123.
The 74LV123 is a dual retriggerable monostable multivibrator with output pulse width control by three
methods. The basic pulse time is programmed by selection of an external resistor (REXT ) and capacitor (CEXT
). They are normally connected as shown in Figure 1. Once triggered, the basic output pulse width may be
extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input
(nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as
desired. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD ,
which also inhibits the triggering. Figures 1 and 2 illustrate pulse control by retriggering and early reset. The
basic output pulse width is essentially determined by the values of the external timing components REXT and
CEXT . For pulse width when CEXT > 10000 pF, see Figure 5. When CEXT > 10,000 pF, the typical output
pulse width is defined as: tW = 0.45 × REXT × CEXT (typ.), where tW = pulse width in ns; REXT = external
resistor in kOhm; and CEXT = external capacitor in pF. Schmitt-trigger action in the nA and nB inputs makes
the circuit highly tolerant of slower input rise and fall times.
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Features
● Optimized for Low Voltage applications: 1.0 V to 5.5 V
● Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V
● Typical VOLP (output ground bounce) < 0.8 V @ VCC = 3.3 V, Tamb = 25 Cel
● Typical VOHV (output VOH undershoot) > 2 V @ VCC = 3.3 V, Tamb = 25 Cel
● DC triggered from active HIGH or active LOW inputs
● Retriggerable for very long pulses up to 100pct duty factor
● Direct reset terminates output pulses
● Schmitt-trigger action on all inputs except for the reset input
● Output capability: standard (except for nREXT /CEXT )
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Philips Semiconductors - PIP - 74LV123; Dual retriggerable monostable multivibrator with reset
● ICC category: MSI
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Datasheet
Type number Title Publication
release date Datasheet status Page
count File
size
(kB)
Datasheet
74LV123 Dual retriggerable
monostable
multivibrator with
reset
3/13/2003 Product
specification 17 153
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Parametrics
Type
number Package Description Propagation
Delay(ns) Voltage No.
of
Pins
Power
Dissipation
Considerations
Logic
Switching
Levels
Output
Drive
Capability
74LV123D SOT109-1
(SO16)
Dual
Retriggerable
Monostable
Multivibrator
with Reset;
Triggerable
via Reset
Input
15 Low 16 Low Power or
Battery
Applications TTL Low
74LV123DB SOT338-1
(SSOP16)
Dual
Retriggerable
Monostable
Multivibrator
with Reset;
Triggerable
via Reset
Input
15 Low 16 Low Power or
Battery
Applications TTL Low
74LV123N SOT38-1
(DIP16)
Dual
Retriggerable
Monostable
Multivibrator
with Reset;
Triggerable
via Reset
Input
15 Low 16 Low Power or
Battery
Applications TTL Low
74LV123PW SOT403-1
(TSSOP16)
Dual
Retriggerable
Monostable
Multivibrator
with Reset;
Triggerable
via Reset
Input
15 Low 16 Low Power or
Battery
Applications TTL Low
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Philips Semiconductors - PIP - 74LV123; Dual retriggerable monostable multivibrator with reset
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Products, packages, availability and ordering
Type
number North
American
type number
Ordering code
(12NC) Marking/Packing
Download
PDF
File
IC packing info Package Device
status Buy online
74LV123D 74LV123D 9352 102 50112 Standard Marking
* Tube SOT109-1
(SO16) Full production
order this
product
online
-
74LV123D-
T 9352 102 50118 Standard Marking
* Reel Pack,
SMD, 13"
SOT109-1
(SO16) Full production
order this
product
online
-
74LV123DB 74LV123DB 9352 102 60112 Standard Marking
* Tube SOT338-1
(SSOP16) Full production
order this
product
online
-
74LV123DB-
T 9352 102 60118 Standard Marking
* Reel Pack,
SMD, 13"
SOT338-1
(SSOP16) Full production
order this
product
online
-
74LV123N 74LV123N 9352 102 70112 Standard Marking
* Tube SOT38-1
(DIP16) Full production
order this
product
online
-
74LV123PW 74LV123PW 9352 102 80112 Standard Marking
* Tube
SOT403-1
(TSSOP16)
Full production
order this
product
online
-
74LV123PW-
T 9352 102 80118 Standard Marking
* Reel Pack,
SMD, 13"
SOT403-1
(TSSOP16)
Full production
order this
product
online
-
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to
74LV123
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function or related to the type number(s) as listed on this page. The similar products page includes products
from the same catalog tree(s), relevant selection guides and products from the same functional category.
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