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
74F656A
Octal buffer/driver with parity,
non-inverting (3-State)
Product specification
Supersedes data of 1991 Jul 17
IC15 Data Handbook
2000 Jun 30
INTEGRATED CIRCUITS
Philips Semiconductors Product specification
74F656A
Octal buffer/driver with parity, non-inverting (3-State)
2
2000 Jun 30 853-0383 24025
FEATURES
•Significantly improved AC performance over 74F656
•High impedance NPN base input for reduced loading
(40µA in High and Low states)
•Ideal in applications where high output drive and light bus loading
are required (IIL is 40µA vs. F AST std of 600 µA)
•74F656A combines 74F244 and 74F280A functions in one
package
•Non-inverting
•3-State outputs sink 64mA and source 15mA
•24-pin plastic Slim DIP (300mil) package
•Inputs on one side and outputs on the other side simplifies PC
board layout
•Combined functions reduce part count and enhance system
performance
•Industrial temperature range available (–40°C to +85°C)
DESCRIPTION
The 74F656A is an octal buffer and line driver with parity
generation/checking designed to be employed as memory address
drivers, clock drivers and bus-oriented transmitters/receivers. These
parts include parity generator/checker to improve PC board density.
TYPE TYPICAL
PROPAGATION
DELAY
TYPICAL SUPPLY CURRENT
(TOTAL)
74F656A 6.5ns 64mA
ORDERING INFORMATION
DESCRIPTION COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
INDUSTRIAL RANGE
VCC = 5V ±10%,
Tamb = –40°C to +85°CPKG DWG #
24-pin Plastic Slim
DIP (300mil) N74F656AN I74F656AN SOT222-1
24-pin Plastic SOL N74F656AD I74F656AD SOT137-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION 74F(U.L.)
HIGH/LOW LOAD VALUE
HIGH/LOW
D0–D7 Data inputs 2.0/0.066 40µA/40µA
PI Parity input 1.0/0.033 20µA/20µA
OE0, OE1, OE2Output Enable Inputs (active Low) 1.0/0.033 20µA/20µA
ΣE, ΣOParity outputs 750/106.7 15mA/64mA
Q0–Q7 Data outputs 750/106.7 15mA/64mA
NOTE: One (1.0) FAST Unit Load (U.L.) is defined as: 20µA in the High state and 0.6mA in the Low state.
Philips Semiconductors Product specification
74F656A
Octal buffer/driver with parity, non-inverting (3-State)
2000 Jun 30 3
PIN CONFIGURATION
24
23
22
21
20
19
18
17
16
15
14
1312
10
11
9
8
7
6
5
4
3
2
1
OE0
OE1
PI
D0
D1
D2
D3
D4
D5
D6
D7
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
ΣE
ΣO
VCC
GND
OE2
SF01169
LOGIC SYMBOL
D0 D1 D2 D3 D4 D5 D6 D7
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
OE0
OE1
PI ΣE
ΣO
4567891011
21
22
1
2
3
20 19 18 17 16 15 14 13
OE2
23
VCC=Pin 24
GND=Pin 12
SF01171
LOGIC SYMBOL (IEEE/IEC)
SF01173
3
19
18
17
16
15
14
6
7
4
8
9
10
1
23
20
54
1311
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
2EN4
≥1
P3
2K
3,5,6,7,8
9,10,11,12
3,5,6,7,8
9,10,11,12
[EVEN]
[ODD] 22
21
Philips Semiconductors Product specification
74F656A
Octal buffer/driver with parity, non-inverting (3-State)
2000 Jun 30 4
LOGIC DIAGRAM
3
4
5
6
7
8
9
10
11
23
2
20
19
18
17
16
15
14
13
21
22
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
ΣE
ΣO
D0
D1
D2
D3
D4
D5
D6
D7
OE1
OE2
1
OE0
PI
SF01175
VCC = Pin 24
GND = Pin 12
Philips Semiconductors Product specification
74F656A
Octal buffer/driver with parity, non-inverting (3-State)
2000 Jun 30 5
FUNCTION TABLE
INPUTS OUTPUTS
OE0
OE1
OE2
Dn
Qn
OE0
OE1
OE2
Dn
Qn
L L L L L
L L L H H
H X X X Z
X H X X Z
X X H X Z
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
FUNCTION TABLE for PARITY OUTPUTS
INPUTS PARITY
OUTPUTS
Number of inputs, High (PI, D0–D7) ΣEΣ0
Even - 0, 2, 4, 6, 8 H L
Odd - 1, 3, 5, 7, 9 L H
Any OEn = High Z Z
H = High voltage level
L = Low voltage level
Z = High impedance “off” state
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits 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
O
p
erating free air tem
p
erature range
Commercial range 0 to +70 °C
T
amb
Operating
free
-
air
temperat
u
re
range
Industrial range –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
VIH 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
O
p
erating free air tem
p
erature range
Commercial range 0 70 °C
T
amb
Operating
free
-
air
temperat
u
re
range
Industrial range –40 85 °C
Philips Semiconductors Product specification
74F656A
Octal buffer/driver with parity, non-inverting (3-State)
2000 Jun 30 6
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
TEST CONDITIONS1
LIMITS UNIT
SYMBOL
TEST
CONDITIONS1
MIN TYP2MAX
VCC = MIN
IO= 3mA
±10%VCC 2.4 V
VOH High-level output voltage
VCC
=
MIN
,
VIL = MAX
V MIN
I
OH = –
3mA
±5%VCC 2.7 3.3 V
V
IH =
MIN
IOH = –15mA ±10%VCC 2.0 V
VO
p
VCC = MIN,
V MAX
IO= 64mA
±10%VCC 0.55 V
V
OL
w-
v
u
u
v
V
IL =
MAX
VIH = MIN
I
OL =
64mA
±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 = 0.0, VI = 7.0V 100 µA
Commercial Dn 40 µA
I
Hi
g
h-level
Commercial
range Pl, OEn
VCC = MAX V =27V
20 µA
I
IH
High level
input current Industrial Dn
V
CC =
MAX
,
V
I =
2
.
7V
80 µA
Industrial
range Pl, OEn 40 µA
I
Low level in
p
ut current
Dn
VCC = MAX V =05V
–40 µA
I
IL
Lo
w-
le
v
el
inp
u
t
c
u
rrent
Pl, OEn
V
CC =
MAX
,
V
I =
0
.
5V
–20 µA
IOZH Off-state current
High-level voltage applied VCC = MAX, VO = 2.7V 50 µA
IOZL Off-state current
Low-level voltage applied VCC = MAX, VO = 0.5V –50 µA
IOS Short-circuit output current3VCC = MAX –100 –225 mA
ICCH 50 80 mA
ICC Supply current
(total)
ICCL VCC = MAX 78 110 mA
(total)
ICCZ 83 90 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.
AC ELECTRICAL CHARACTERISTICS
LIMITS
TEST
Tamb = +25°C,
V=+50V
Tamb = 0°C to +70°C
V=+50V±10%
Tamb = –40°C to +85°C
V=+50V±10%
SYMBOL PARAMETER
TEST
CONDITIONS
V
CC = +
5
.
0V
C
L
= 50
p
F
,
V
CC = +
5
.
0V
±
10%
C
L
= 50
p
F
,
V
CC = +
5
.
0V
±
10%
C
L
= 50
p
F
,
UNIT
CONDITIONS
CL
=
50pF,
RL = 500Ω
CL
=
50pF,
RL = 500Ω
CL
=
50pF,
RL = 500Ω
MIN TYP MAX MIN MAX MIN MAX
tPLH
tPHL Propagation delay
Dn to Qn W aveform 1 2.0
2.5 4.0
5.5 6.5
7.0 2.0
2.5 7.0
7.5 2.0
2.5 8.0
9.0 ns
ns
tPLH
tPHL Propagation delay
Dn to ΣE, ΣOWaveform 1, 2 5.5
5.5 10.0
11.0 13.0
14.5 5.5
5.5 14.0
16.5 4.5
5.5 16.5
18.0 ns
ns
tPZH
tPZL Output enable time to
High or Low level W aveform 3
W aveform 4 3.5
4.0 7.0
8.0 10.5
11.0 3.5
4.5 11.5
12.0 3.0
4.0 13.0
13.5 ns
ns
tPHZ
tPLZ Output disable time from
High or Low level W aveform 3
W aveform 4 1.5
2.0 4.5
5.0 8.0
8.0 1.5
2.0 9.0
9.0 1.5
1.5 10.0
10.0 ns
ns
Philips Semiconductors Product specification
74F656A
Octal buffer/driver with parity, non-inverting (3-State)
2000 Jun 30 7
AC WAVEFORMS
SF00965
VM
VMVM
VM
tPHL
tPLH
Dn
SE, SO, Qn
W aveform 1. Propagation Delay, Non-Inverting Outputs
SF00966
VM
VMVM
VM
tPHL tPLH
Dn
SE, SO, Qn
W aveform 2. Propagation Delay, Inverting Outputs
VM
VM
VM
tPHZ
tPZH VOH -0.3V
0V
OEn
SF00967
SE, SO, Qn, Qn
W aveform 3. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
VM
VM
VM
tPLZ
tPZL
VOL +0.3V
OEn
SF00968
SE, SO, Qn, Qn
W aveform 4. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORM
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
SF00777
TEST SWITCH
tPLZ closed
tPZL closed
All other open
SWITCH POSITION
Philips Semiconductors Product specification
74F656AOctal buffer/driver with parity, non-inverting (3-State)
2000 Jun 30 8
DIP24: plastic dual in-line package; 24 leads (300 mil) SOT222-1
Philips Semiconductors Product specification
74F656AOctal buffer/driver with parity, non-inverting (3-State)
2000 Jun 30 9
SO24: plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
Philips Semiconductors Product specification
74F656AOctal buffer/driver with parity, non-inverting (3-State)
yyyy mmm dd 10
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 134). 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 af fect 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, 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.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 2000
All rights reserved. Printed in U.S.A.
Date of release: 06-00
Document order number: 9397-750 07278


Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition [1]
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
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.
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.
Data sheet status
[1] Please consult the most recently issued datasheet before initiating or completing a design.