Page 1
74F655A*
Octal buffer/driver with parity, inverting
(3-State)
74F656A
Octal buffer/driver with parity,
non-inverting (3-State)
Product specification
IC15 Data Handbook
1991 Jul 17
INTEGRATED CIRCUITS
* Discontinued part. Please see the Discontinued Product List.
Page 2
Philips Semiconductors Product specification
74F655A*
74F656A
Buffers/drivers
74F655A Octal buffer/driver with parity, inverting (3-State)
74F656A Octal buffer/driver with parity, non-inverting (3-State)
2
1991 Jul 17 853-0383 03305
* Discontinued part. Please see the Discontinued Products List.
FEA TURES
•Significantly improved AC performance over 74F655 and 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 (I
IL
is 40µA vs. FAST std of 600µA)
•74F655A combines 74F240 and 74F280A functions in one
package
•74F656A combines 74F244 and 74F280A functions in one
package
•74F655A Inverting
•74F656A 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 74F655A and 74F656A are octal buffers and line drivers 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
DELA Y
TYPICAL SUPPL Y CURRENT
(TOT AL)
74F655A 6.5ns 64mA
74F656A 6.5ns 64mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
INDUSTRIAL RANGE
V
CC
= 5V ±10%,
T
amb
= –40°C to +85°C
PKG 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, OE2 Output Enable Inputs (active Low) 1.0/0.033 20µA/20µA
ΣE, ΣO Parity outputs 750/106.7 15mA/64mA
Q0–Q7 Data outputs (74F655A) 750/106.7 15mA/64mA
Q0–Q7 Data outputs (74F656A) 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.
Page 3
Philips Semiconductors Product specification
74F655A*
74F656A
Buffers/drivers
1991 Jul 17
3
* Discontinued part. Please see the Discontinued Products List.
PIN CONFIGURATION – 74F655A
24
23
22
21
20
19
18
17
16
15
14
1312
10
11
9
8
7
6
5
4
3
2
1
OE
0
OE
1
PI
D0
D1
D2
D3
D4
D5
D6
D7
Q
7
Q
6
Q
5
Q
4
Q
3
Q
2
Q
1
Q
0
ΣE
ΣO
VCC
GND
OE
2
SF01168
PIN CONFIGURATION – 74F656A
24
23
22
21
20
19
18
17
16
15
14
1312
10
11
9
8
7
6
5
4
3
2
1
OE
0
OE
1
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 – 74F655A
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
SF01170
LOGIC SYMBOL – 74F656A
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
IEEE/IEC SYMBOL – 74F655A
SF01172
3
19
18
17
16
15
14
6
7
4
8
9
10
1
23
20
5
4
1311
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
2
EN4
≥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
LOGIC SYMBOL (IEEE/IEC) – 74F656A
SF01173
3
19
18
17
16
15
14
6
7
4
8
9
10
1
23
20
5
4
1311
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
2
EN4
≥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
Page 4
Philips Semiconductors Product specification
74F655A*
74F656A
Buffers/drivers
1991 Jul 17
4
* Discontinued part. Please see the Discontinued Products List.
LOGIC DIAGRAM – 74F655A
3
4
5
6
7
8
9
10
11
2
23
20
19
18
17
16
15
14
13
21
22
Q
0
Q
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
ΣE
ΣO
D0
D1
D2
D3
D4
D5
D6
D7
OE1
OE
2
1
OE
0
PI
SF01174
VCC = Pin 24
GND = Pin 12
Page 5
Philips Semiconductors Product specification
74F655A*
74F656A
Buffers/drivers
1991 Jul 17
5
* Discontinued part. Please see the Discontinued Products List.
LOGIC DIAGRAM – 74F656A
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
OE
2
1
OE
0
PI
SF01175
VCC = Pin 24
GND = Pin 12
Page 6
Philips Semiconductors Product specification
74F655A*
74F656A
Buffers/drivers
1991 Jul 17
6
* Discontinued part. Please see the Discontinued Products List.
FUNCTION TABLE
INPUTS OUTPUTS
74F655A 74F656A
OE0
OE1
OE2
Dn
Qn Qn
L L L L H L
L L L H L H
H X X X Z Z
X H X X Z Z
X X H X Z 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) ΣE Σ0
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
V
CC
Supply voltage –0.5 to +7.0 V
V
IN
Input voltage –0.5 to +7.0 V
I
IN
Input current –30 to +5 mA
V
OUT
Voltage applied to output in High output state –0.5 to +V
CC
V
I
OUT
Current applied to output in Low output state 128 mA
p
p
Commercial range 0 to +70 °C
T
amb
Operating free-air temperature range
Industrial range –40 to +85 °C
T
stg
Storage temperature range –65 to +150 °C
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
MIN NOM MAX
UNIT
V
CC
Supply voltage 4.5 5.0 5.5 V
V
IH
High-level input voltage 2.0 V
V
IL
Low-level input voltage 0.8 V
I
IK
Input clamp current –18 mA
I
OH
High-level output current –15 mA
I
OL
Low-level output current 64 mA
p
p
Commercial range 0 70 °C
T
amb
Operating free-air temperature range
Industrial range –40 85 °C
Page 7
Philips Semiconductors Product specification
74F655A*
74F656A
Buffers/drivers
1991 Jul 17
7
* Discontinued part. Please see the Discontinued Products List.
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS UNIT
SYMBOL PARAMETER TEST CONDITIONS
NO TAG
MIN
TYP
NO TAG
MAX
±10%V
CC
2.4 V
V
OH
High-level output voltage
V
CC
=
MIN
,
VIL = MAX
I
OH
= –
3mA
±5%V
CC
2.7 3.3 V
V
IH
=
MIN
IOH = –15mA ±10%V
CC
2.0 V
p
VCC = MIN,
±10%V
CC
0.55 V
VOLLow-level output voltage
V
IL
=
MAX
VIH = MIN
I
OL
=
64mA
±5%V
CC
0.42 0.55 V
V
IK
Input clamp voltage VCC = MIN, II = I
IK
–0.73 –1.2 V
I
I
Input current at maximum input voltage VCC = 0.0, VI = 7.0V 100 µA
Commercial
Dn 40
µA
High-level
Commercial
range
Pl, OEn
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
p
Dn
–40 µA
IILLow-level input current
Pl, OEn
V
CC
=
MAX, V
I
= 0.
5V
–20 µA
I
OZH
Off-state current
High-level voltage applied
VCC = MAX, VO = 2.7V 50
µA
I
OZL
Off-state current
Low-level voltage applied
VCC = MAX, VO = 0.5V –50 µA
I
OS
Short-circuit output current
3
VCC = MAX –100 –225 mA
I
CCH
50 80 mA
I
CC
Supply current
I
CCL
VCC = MAX
78 110 mA
(total)
I
CCZ
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, T
amb
= 25°C.
3. Not more than one output should be shorted at a time. For testing I
OS
, 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, I
OS
tests should be performed last.
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
amb
= +25°C,
T
amb
= 0°C to +70°C
T
amb
= –40°C to +85°C
SYMBOL PARAMETER
TEST
CONDITIONS
V
CC
= +5.
0V
C
= 50pF,
V
CC
= +5.0V ±
10%
C
= 50pF,
V
CC
= +5.0V ±
10%
C
= 50pF,
UNIT
CONDITIONS
C
L
=
50pF,
RL = 500Ω
C
L
=
50pF,
RL = 500Ω
C
L
=
50pF,
RL = 500Ω
MIN TYP MAX MIN MAX MIN MAX
t
PLH
t
PHL
Propagation delay
Dn to Qn
74F655A Waveform 2
2.0
1.0
4.5
2.5
6.5
4.0
2.0
1.0
7.5
4.5
2.0
1.0
8.5
5.5
ns
ns
t
PLH
t
PHL
Propagation delay
Dn to Qn
74F656A Waveform 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
t
PLH
t
PHL
Propagation delay
Dn to ΣE, ΣO
Waveform 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
t
PZH
t
PZL
Output enable time to
High or Low level
Waveform 3
Waveform 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
t
PHZ
t
PLZ
Output disable time from
High or Low level
Waveform 3
Waveform 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
Page 8
Philips Semiconductors Product specification
74F655A*
74F656A
Buffers/drivers
1991 Jul 17
8
* Discontinued part. Please see the Discontinued Products List.
AC WAVEFORMS
SF00965
V
M
V
M
V
M
V
M
t
PHL
t
PLH
Dn
E, O, Qn
Waveform 1. Propagation Delay, Non-Inverting Outputs
SF00966
V
M
V
M
V
M
V
M
t
PHL
t
PLH
Dn
E, O, Qn
Waveform 2. Propagation Delay, Inverting Outputs
V
M
V
M
V
M
t
PHZ
t
PZH
VOH -0.3V
0V
OE
n
SF00967
E, O, Qn, Qn
Waveform 3. 3-State Output Enable Time to High Level
and Output Disable Time from High Level
V
M
V
M
V
M
t
PLZ
t
PZL
VOL +0.3V
OE
n
SF00968
E, O, Qn, Qn
Waveform 4. 3-State Output Enable Time to Low Level
and Output Disable Time from Low Level
TEST CIRCUIT AND WAVEFORM
t
w
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
90%
V
M
10%
NEGATIVE
PULSE
POSITIVE
PULSE
t
w
AMP (V)
0V
0V
t
THL (tf
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLHtTHL
1MHz 500ns
2.5ns 2.5ns
Input Pulse Definition
V
CC
family
74F
D.U.T.
PULSE
GENERATOR
R
L
C
L
R
T
V
IN
V
OUT
Test Circuit for 3-State Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC electrical characteristics for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
t
THL (tf
)
t
TLH (tr
)
t
TLH (tr
)
AMP (V)
amplitude
3.0V
1.5V
V
M
R
L
7.0V
SF00777
TEST SWITCH
t
PLZ
closed
t
PZL
closed
All other open
SWITCH POSITION
Page 9
Philips Semiconductors Product specification
74F655A*, 74F656ABuffers/drivers
1991 Jul 17
9
* Discontinued part. Please see the Discontinued Product List.
DIP24: plastic dual in-line package; 24 leads (300 mil) SOT222-1
Page 10
Philips Semiconductors Product specification
74F655A*, 74F656ABuffers/drivers
1991 Jul 17
10
* Discontinued part. Please see the Discontinued Product List.
SO24: plastic small outline package; 24 leads; body width 7.5 mm SOT137-1
Page 11
Philips Semiconductors Product specification
74F655A*, 74F656ABuffers/drivers
1991 Jul 17
11
* Discontinued part. Please see the Discontinued Product List.
NOTES
Page 12
Philips Semiconductors Product specification
74F655A*, 74F656ABuffers/drivers
yyyy mmm dd
12
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 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, 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 1998
All rights reserved. Printed in U.S.A.
print code Date of release: 10-98
Document order number: 9397-750-05169
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 chages 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.
* Discontinued part. Please see the Discontinued Product List.
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