DS14C238
DS14C238 Single Supply TIA/EIA-232 4 x 4 Driver/Receiver
Literature Number: SNLS084B
DS14C238
Single Supply TIA/EIA-2324x4Driver/Receiver
General Description
The DS14C238 is a four driver, four receiver device which
conforms to the TIA/EIA-232-E standard and CCITT V.28
recommendations. This device eliminates ±12V supplies by
employing an internal DC-DC converter to generate the nec-
essary output levels from a single +5V supply. Driver slew
rate control and receiver noise filtering have also been inter-
nalized to eliminate the need for external slew rate control
and noise filtering capacitors.
Features
nConforms to TIA/EIA-232-E and CCITT V.28
nInternal DC-DC converter
nOperates with single +5V supply
nLow power requirement — I
CC
10 mA max
nInternal driver slew rate control
nReceiver noise filtering
nOperates above 120 kbits/sec
nDirect replacement for MAX238
Connection Diagram
01128201
Order Number DS14C238WM, DS14C238WMX
See NS Package Number M24B
Functional Diagram
01128202
July 2002
DS14C238 Single Supply TIA/EIA-2324x4Driver/Receiver
© 2002 National Semiconductor Corporation DS011282 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
) −0.3V to +6V
V+ Pin (V
CC
−0.3V) to +15V
V− Pin +0.3V to −15V
Driver Input Voltage −0.3V to (V
CC
+0.3V)
Driver Output Voltage (V+ +0.3V) to (V−
−0.3V)
Receiver Input Voltage ±30V
Receiver Output Voltage −0.3V to (V
CC
+0.3V)
Junction Temperature +150˚C
Maximum Package Power Dissipation @+25˚C (Note 6)
WM Package 1400 mW
Storage Temp. Range −65˚C to +150˚C
Lead Temp.
(Soldering, 4 Seconds) +260˚C
Short Circuit Duration (D
OUT
) Continuous
ESD Rating
(HBM, 1.5 kΩ, 100 pF) ≥2.0 kV
Recommended Operating
Conditions
Min Max Units
Supply Voltage, V
CC
4.5 5.5 V
Operating Free Air Temp. (T
A
)
DS14C238 0 +70 ˚C
Electrical Characteristics (Note 2)
Over recommended operating conditions, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
DEVICE CHARACTERISTICS
V+ Positive Power Supply R
L
=3kΩ, C1–C4 = 1.0 µF, D
IN
= 0.8V 9.0 V
V− Negative Power Supply R
L
=3kΩ, C1–C4 = 1.0 µF, D
IN
= 2.0V −8.0 V
I
CC
Supply Current (V
CC
) No Load 7.0 10 mA
DRIVER CHARACTERISTICS
V
IH
High Level Input Voltage 2.0 V
CC
V
V
IL
Low Level Input Voltage GND 0.8 V
I
IH
High Level Input Current V
IN
≥2.0V −10 +10 µA
I
IL
Low Level Input Current V
IN
≤0.8V −10 +10 µA
V
OH
High Level Output Voltage R
L
=3kΩ5.0 7.4 V
V
OL
Low Level Output Voltage −6.3 −5.0 V
I
OS
+ Output High Short V
O
= 0V, V
IN
= 0.8V (Note 3) −30 −15 −5.0 mA
Circuit Current
I
OS
− Output Low Short V
O
= 0V, V
IN
= 2.0V 5.0 12 30 mA
Circuit Current
R
O
Output Resistance −2V ≤V
O
≤+2V, V
CC
= GND = 0V 300 Ω
RECEIVER CHARACTERISTICS
V
TH
Input High Threshold Voltage 1.9 2.4 V
V
TL
Input Low Threshold Voltage 0.8 1.5 V
V
HY
Hysteresis 0.2 0.4 1.0 V
R
IN
Input Resistance 3.0 4.5 7.0 kΩ
I
IN
Input Current V
IN
= +15V 2.14 3.8 5.0 mA
V
IN
= +3V 0.43 0.6 +1.0 mA
V
IN
= −3V −1.0 −0.6 −0.43 mA
V
IN
= −15V −5.0 −3.8 −2.14 mA
V
OH
High Level Output Voltage V
IN
= −3V, I
O
= −3.2 mA 3.5 4.5 V
V
IN
= −3V, I
O
= −20 µA 4.0 4.9 V
V
OL
Low Level Output Voltage V
IN
= +3V, I
O
= +2.0 mA 0.25 0.4 V
DS14C238
www.national.com 2
Switching Characteristics (Note 4)
Over recommended operating conditions, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
DRIVER CHARACTERISTICS
t
PLH
Propagation Delay LOW to HIGH R
L
=3kΩ0.7 4.0 µs
t
PHL
Propagation Delay HIGH to LOW C
L
= 50 pF 0.6 4.0 µs
t
sk
Skew |t
PLH
–t
PHL
|(Figures 1, 2) 0.1 1.0 µs
SR1 Output Slew Rate R
L
=3kΩto7kΩ,C
L
= 50 pF 4.0 15 30 V/µs
SR2 Output Slew Rate R
L
=3kΩ,C
L
= 2500 pF 3.0 5.0 V/µs
RECEIVER CHARACTERISTICS
t
PLH
Propagation Delay LOW to HIGH Input Pulse Width >10 µs 2.0 6.5 µs
t
PHL
Propagation Delay HIGH to LOW C
L
= 50 pF 2.8 6.5 µs
t
SK
Skew | t
PLH
–t
PHL
|(Figures 3, 4) 0.8 2.0 µs
t
NW
Noise Pulse Width Rejected (Figures 3, 4) 2.5 1.0 µs
Note 1: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of “Electrical Characteristics” specify conditions for device operation.
Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground unless otherwise
specified.
Note 3: IOS+ and IOS− values are for one output at a time. If more than one output is shorted simultaneously, the device power dissipation may be exceeded.
Note 4: Receiver AC input waveform for test purposes: tr=t
f= 200 ns, VIH =3V,V
IL =−3V,f=64kHz(128 kbits/sec). Driver AC input waveform for test purposes:
tr=t
f≤10 ns, VIH =3V,V
IL =0V,f=64kHz(128 kbits/sec).
Note 5: All typicals are given for VCC = 5.0V and TA= +25˚C.
Note 6: Ratings apply to ambient temperature at +25˚C. Above this temperature derate: WM package 13.5 mW/˚C.
Parameter Measurement Information
01128204
FIGURE 1. Driver Load Circuit
01128205
FIGURE 2. Driver Switching Waveform
01128206
FIGURE 3. Receiver Load Circuit
DS14C238
www.national.com3
Parameter Measurement Information (Continued)
Pin Descriptions
V
CC
(pin 9) — Power supply pin for the device,
+5V (±10%).
V+ (pin 11) — Positive supply for TIA/EIA-232-E drivers. Recommended external capacitor: C4 = 1.0 µF (6.3V). This supply is not
intended to be loaded externally.
V− (pin 15) — Negative supply for TIA/EIA-232-E drivers. Recommended external capacitor: C3 = 1.0 µF (16V). This supply is not
intended to be loaded externally.
C1+, C1− (pins 10 and 12) — External capacitor connection pins. Recommended capacitor – 1.0 µF (6.3V).
C2+, C2− (pins 13 and 14) — External Capacitor connection pins. Recommended capacitor – 1.0 µF (16V).
D
IN
1–4 (pins 5, 18, 19, and 21) — Driver input pins are TTL/CMOS compatible. Inputs of unused drivers may be left open, an
internal pull-up resistor (500 kΩminimum, typically 5 MΩ) pulls input to V
CC
. Output will be LOW for open inputs.
D
OUT
1–4 (pins 2, 1, 24, and 20) — Driver output pins conform to TIA/EIA-232-E levels.
R
IN1
1–4 (pins 3, 7, 23, and 16) — Receiver input pins accept TIA/EIA-232-E input voltages (±15V). Receivers feature a noise
filter and guaranteed hysteresis of 200 mV. Unused receiver input pins may be left open. Internal input resistor (5 kΩ) pulls input
LOW, providing a failsafe HIGH output.
R
OUT
1–4 (pins 4, 6, 22, and 17) — Receiver output pins are TTL/CMOS compatible. Receiver output HIGH voltage is specified
for both CMOS and TTL load conditions.
GND (pin 8) — Ground Pin.
01128207
FIGURE 4. Receiver Propagation Delays and Noise Rejection
DS14C238
www.national.com 4
Physical Dimensions inches (millimeters) unless otherwise noted
Order Number DS14C238WM, DS14C238WMX
NS Package Number M24B
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www.national.com
DS14C238 Single Supply TIA/EIA-2324x4Driver/Receiver
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