INTEGRATED CIRCUITS
74F655A*
Octal buffer/driver with parity, inverting
(3-State)
74F656A
Octal buffer/driver with parity,
non-inverting (3-State)
* Discontinued part. Please see the Discontinued Product List.
Product specification
IC15 Data Handbook
1991 Jul 17
Philips
Semiconductors
Philips Semiconductors
Product specification
Buffers/drivers
74F655A Octal buffer/driver with parity, inverting (3-State)
74F656A Octal buffer/driver with parity, non-inverting (3-State)
FEATURES
74F655A*
74F656A
•
Significantly improved AC performance over 74F655 and 74F656
•
High impedance NPN base input for reduced loading
(40µA in High and Low states)
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.
TYPICAL
PROPAGATION
DELAY
6.5ns
6.5ns
•
Ideal in applications where high output drive and light bus loading
•
74F655A combines 74F240 and 74F280A functions in one
package
are required (I
IL
is 40µA vs. FAST std of 600µA)
TYPE
74F655A
74F656A
TYPICAL SUPPLY CURRENT
(TOTAL)
64mA
64mA
•
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)
ORDERING INFORMATION
DESCRIPTION
24-pin Plastic Slim
DIP (300mil)
24-pin Plastic SOL
COMMERCIAL RANGE
V
CC
= 5V
±10%,
T
amb
= 0°C to +70°C
N74F656AN
N74F656AD
INDUSTRIAL RANGE
V
CC
= 5V
±10%,
T
amb
= –40°C to +85°C
I74F656AN
I74F656AD
PKG DWG #
SOT222-1
SOT137-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
D0–D7
PI
OE0, OE1, OE2
ΣE, ΣO
Q0–Q7
Q0–Q7
Data inputs
Parity input
Output Enable Inputs (active Low)
Parity outputs
Data outputs (74F655A)
Data outputs (74F656A)
DESCRIPTION
74F(U.L.)
HIGH/LOW
2.0/0.066
1.0/0.033
1.0/0.033
750/106.7
750/106.7
750/106.7
LOAD VALUE
HIGH/LOW
40µA/40µA
20µA/20µA
20µA/20µA
15mA/64mA
15mA/64mA
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.
* Discontinued part. Please see the Discontinued Products List.
1991 Jul 17
2
853-0383 03305
Philips Semiconductors
Product specification
Buffers/drivers
74F655A*
74F656A
PIN CONFIGURATION – 74F655A
OE0
OE1
PI
D0
D1
D2
D3
D4
D5
D6
D7
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 VCC
23 OE2
22
ΣO
21
ΣE
20 Q0
19 Q1
18 Q2
17 Q3
16 Q4
15 Q5
14 Q6
13 Q7
PIN CONFIGURATION – 74F656A
OE0
OE1
PI
D0
D1
D2
D3
D4
D5
D6
D7
GND
1
2
3
4
5
6
7
8
9
10
11
12
24 VCC
23 OE2
22
ΣO
21
ΣE
20 Q0
19 Q1
18 Q2
17 Q3
16 Q4
15 Q5
14 Q6
13 Q7
SF01168
SF01169
LOGIC SYMBOL – 74F655A
4
D0
3
1
2
23
PI
OE0
OE1
OE2
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
ΣE
ΣO
21
22
5
D1
6
D2
7
D3
8
D4
9
D5
10
D6
11
D7
LOGIC SYMBOL – 74F656A
4
5
6
7
8
9
10
11
D0
3
1
2
23
PI
OE0
OE1
OE2
Q0
D1
D2
D3
D4
D5
D6
D7
ΣE
ΣO
21
22
Q1
Q2
Q3
Q4
Q5
Q6
Q7
V
CC
=Pin 24
GND=Pin 12
20
19
18
17
16
15
14
13
SF01170
V
CC
=Pin 24
GND=Pin 12
20
19
18
17
16
15
14
13
SF01171
IEEE/IEC SYMBOL – 74F655A
2K
3,5,6,7,8
9,10,11,12
3
1
2
23
4
5
6
7
8
9
10
11
P3
≥1
EN4
3,5,6,7,8
9,10,11,12
[EVEN]
[ODD]
21
22
LOGIC SYMBOL (IEEE/IEC) – 74F656A
2K
3,5,6,7,8
9,10,11,12
3
1
2
23
20
19
18
17
16
15
14
13
4
Z5
5
6
7
8
9
10
11
Z6
Z7
Z8
Z9
Z10
Z11
Z12
4
19
18
17
16
15
14
13
P3
≥1
EN4
3,5,6,7,8
9,10,11,12
[EVEN]
[ODD]
21
22
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
4
20
SF01172
SF01173
* Discontinued part. Please see the Discontinued Products List.
1991 Jul 17
3