Philips Semiconductors
74F244/74F244B
Octal buffers (3-State)
Product specification 1994 Dec 05
INTEGRATED CIRCUITS
IC15 Data Handbook
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
2
1994 Dec 5 853-0357 14381
FEATURES
•Octal bus interface
• 3-State output buffer sink 64mA
•15mA source current
•Guaranteed output skew less than 2.0ns (74F244B)
•Reduced ground bounce (74F244B)
•Reduced ICC (74F244B)
•Reduced loading (74F244B IIL = 40µA)
•Split lead frame offers increased noise immunity (74F244B)
•Industrial temperature range available (-40°C to +85°C) for
74F244
•74F244 available in SSOP Type II package
DESCRIPTION
The 74F244 is an octal buffer that is ideal for driving bus lines of
buffer memory address registers. The outputs are all capable of
sinking 64mA and sourcing up to 15mA, producing very good
capacitive drive characteristics. The device features two output
enables, OEa and OEb, each controlling four of the 3-State outputs.
The 74F244B is functionally equivalent to the 74F244. It has been
designed to reduce effects of ground noise. Other advantages are
noted in the features.
TYPE TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPLY
CURRENT (TOTAL)
74F244 4.0ns 53mA
74F244B 4.0ns 33mA
ORDERING INFORMATION
ORDER CODE
COMMERCIAL RANGE INDUSTRIAL RANGE
PKG DWG #
DESCRIPTION VCC = 5V ±10%, VCC = 5V ±10%,
PKG
DWG
#
Tamb = 0°C to +70°C Tamb = -40°C to +85°C
20-pin plastic DIP N74F244N, N74F244BN I74F244N SOT146-1
20-pin plastic SOL N74F244D, N74F244BD I74F244D SOT163-1
20-pin plastic SSOP II N74F244DB SOT339-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS DESCRIPTION 74F (U.L.)
HIGH/LOW LOAD VALUE
HIGH/LOW
Ian, Ibn Data inputs (74F244) 1.0/2.67 20µA/1.6mA
Data inputs (74F244B) 1.0/0.067 20µA/40µA
OEa, OEbOutput enable inputs (active low) (74F244) 1.0/1.67 20µA/1.0mA
Output enable inputs (active low) (74F244B) 1.0/0.067 20µA/40µA
Yan, Ybn Data outputs 750/106.7 15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the high state and 0.6mA in the low state.
PIN CONFIGURATION
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
16
17
18
19
20 VCC
OEa
Ia0
Yb0
Ia1
Yb1
Ia2
Yb2
Ia3
Yb3
GND
SF00227
OEb
Ya0
Ib0
Ya1
Ib1
Ya2
Ib2
Ya3
Ib3
LOGIC SYMBOL
OEa
1
SF00228
2 4 6 8 17 15 13 11
18 16 14 12 3 5 7 9
Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3
Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3
VCC = Pin 20
GND = Pin 10
OEb19
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 5 3
IEC/IEEE SYMBOL
1
2D
EN1
EN2
1
2
19
2
4
6
8
17
15
13
11
18
16
14
12
3
5
7
9
SF00229
LOGIC DIAGRAM
VCC = Pin 20
Ia0
SF00230
OEa
Ia3
Ia2
Ia1
2
4
6
8
1
Ya0
Ya1
Ya2
Ya3
18
16
14
12
Ib0
Ib1
Ib2
Ib3
OEb
17
15
13
11
19
3
5
7
9
Yb0
Yb1
Yb2
Yb3
GND = Pin 10
FUNCTION TABLE
INPUTS OUTPUTS
OEa Ia OEb Ib Ya Yb
L L L L L L
L H L H H H
H X H X Z Z
NOTES:
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance ”off” state
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 5 4
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL PARAMETER RATING UNIT
VCC Supply voltage -0.5 to +7.0 V
VIN Input voltage -0.5 to +7.0 V
IIN Input current -30 to +5 mA
VOUT Voltage applied to output in high output state -0.5 to VCC V
IOUT Current applied to output in low output state 128 mA
T
Otif it t
Commercial range 0 to +70 °C
Tamb Operating free air temperature range Industrial range
(74F244 only) -40 to +85 °C
Tstg Storage temperature range -65 to +150 °C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5.0 5.5 V
VIN High-level input voltage 2.0 V
VIL Low-level input voltage 0.8 V
IIK Input clamp current –18 mA
IOH High-level output current –15 mA
iol Low-level output current 64 mA
T
Otif it t
Commercial range 0 +70 °C
Tamb Operating free air temperature range Industrial range
(74F244 only) –40 +85 °C
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 5 5
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST LIMITS
UNIT
SYMBOL
PARAMETER
CONDITIONS1MIN TYP2MAX
UNIT
VCC = MIN, IOH = -3mA ±10%VCC 2.5 V
VOH High-level output voltage VIL = MAX, ±5%VCC 2.7 3.4 V
VIH = MIN IOH = -15mA ±10%VCC 2.0 V
±5%VCC 2.0 V
VOL Low-level output voltage VCC = MIN,
VIL = MAX, IOL = MAX ±10%VCC 0.55 V
VIH = MIN, ±5%VCC 0.42 0.55 V
VIK Input clamp voltage VCC = MIN, II = IIK -0.73 -1.2 V
IIInput current at maximum input voltage VCC = MAX, VI = 7.0V 100 µA
IIH High-level input current VCC = MAX, VI = 2.7V 20 µA
74F244 OEa, OEb -1.0 mA
IIL Low-level input current 74F244 Ian, Ibn VCC = MAX, VI = 0.5V -1.6 mA
74F244B all inputs -40 µA
IOZH Off-state output current,
high-level voltage applied VCC = MAX, VO = 2.7V 50 µA
IOZL Off-state output current,
low-level voltage applied VCC = MAX, VO = 0.5V -50 µA
IOS Short-circuit output current
3
VCC = MAX -100 -225 mA
ICCH 40 60 mA
74F244 ICCL VCC = MAX 60 90 mA
ICC Supply current (total) ICCZ 60 90 mA
ICCH 20 30 mA
74F244B ICCL VCC = MAX 50 70 mA
ICCZ 29 40 mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at VCC = 5V, Tamb = 25°C.
3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, IOS tests should be performed last.
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 5 6
AC ELECTRICAL CHARACTERISTICS FOR 74F244
A PORT LIMITS
Tamb = +25°C Tamb = 0°C to +70°C Tamb = -40°C to +85°C
SYMBOL PARAMETER TEST VCC = +5.0V VCC = +5.0V ± 10% VCC = +5.0V ± 10% UNIT
CONDITION CL = 50pF,
RL = 500ΩCL = 50pF,
RL = 500ΩCL = 50pF,
RL = 500Ω
MIN TYP MAX MIN MAX MIN MAX
tPLH
tPHL Propagation delay
Ian, Ibn to Yn W aveform 1 2.5
2.5 4.0
4.0 5.2
5.2 2.0
2.0 6.2
6.5 1.5
2.0 7.0
7.0 ns
tPZH
tPZL Output enable time
to high or low W aveform 2
W aveform 4 2.0
2.0 4.3
5.0 5.7
7.0 2.0
2.0 6.7
8.0 2.0
2.0 8.0
8.5 ns
tPHZ
tPLZ Output disable time
from high or low Waveform 2
W aveform 4 1.5
1.5 2.5
2.5 5.5
5.5 1.0
1.0 6.0
5.5 1.0
1.0 6.0
5.5 ns
AC ELECTRICAL CHARACTERISTICS FOR 74F244B
LIMITS
Tamb = +25°C Tamb = 0°C to +70°C
SYMBOL PARAMETER TEST VCC = +5.0V VCC = +5.0V ± 10% UNIT
CONDITION CL = 50pF, RL = 500ΩCL = 50pF, RL = 500Ω
MIN TYP MAX MIN MAX
tPLH
tPHL Propagation delay
Ian, Ibn to Yn W aveform 1 2.5
2.5 4.5
4.5 5.7
6.0 2.0
2.5 6.2
6.5 ns
tPZH
tPZL Output enable time
to high or low level W aveform 2
W aveform 4 2.0
3.0 4.0
5.5 6.0
7.5 2.0
3.0 6.5
8.0 ns
tPHZ
tPLZ Output disable time
from high or low level W aveform 2
W aveform 4 1.5
1.5 2.5
2.5 5.5
5.5 1.0
1.0 6.0
5.5 ns
tsk(0) Output skew
,
W aveform 3 1.5 2.0 ns
NOTES:
1. |tPN actual - tPM actual| for any output compared to any other output where N and M are either LH or HL.
2. Skew times are valid only under same test conditions (temperature, VCC, loading, etc.,).
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 5 7
AC WAVEFORMS
For all waveforms, VM = 1.5V.
VM
VM
VM
VM
Yn
Ian, Ibn
tPLH tPHL
SF00231
W aveform 1. Propagation Delay for data to outputs
VOH–0.3V
VM
VM
VM
Yn
tPZH tPHZ
SF00233
OEn
0V
W aveform 2. 3-State output enable time to high level
and output disable time from high level
VM
VM
Yn, Yn
tsk(0)
SF00232
Yn, Yn
W aveform 3. Output skew
VOL+0.3V
VM
VM
VM
Yn
tPZL tPLZ
SF00234
OEn
3.5V
W aveform 4. 3-State output enable time to low level
and output disable time from low level
TEST CIRCUIT AND WAVEFORMS
tw90%
VM
10%
90%
VM10%
90%
VM10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
0V
tTHL (tf )
INPUT PULSE REQUIREMENTS
rep. rate twtTLH tTHL
1MHz 500ns 2.5ns 2.5ns
Input pulse definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN VOUT
Test circuit for 3-State outputs
DEFINITIONS:
RL= Load resistor; see AC electrical characteristics for
value.
CL= Load capacitance includes jig and probe
capacitance; see AC electrical characteristics for
value
RT= Termination resistance should be equal to ZOUT of
pulse generators.
tTHL (tf )
tTLH (tr )
tTLH (tr )
AMP (V)
amplitude
3.0V 1.5V
VM
RL
7.0V
SWITCH POSITION
TEST SWITCH
closed
openAll other
tPLZ, tPZL
SF000235
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 05 8
DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 05 9
SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 05 10
SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
1994 Dec 05 11
NOTES
Philips Semiconductors Product specification
74F244/74F244BOctal buffers (3-State)
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. 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. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
LIFE SUPPORT APPLICATIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appl iances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
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Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Philips Semiconductors and Philips Electronics North America Corporation
register eligible circuits under the Semiconductor Chip Protection Act.
Copyright Philips Electronics North America Corporation 1996
All rights reserved. Printed in U.S.A.
(print code) Date of release: October 28, 1991
Document order number: 9397-750-05103
9397-750-05103