Philips 74F456 Technical data
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INTEGRATED CIRCUITS
74F455*, 74F456
Buffers/drivers
* Discontinued part. Please see the Discontinued Product List.
Product specification
Supersedes data of 1990 Nov 26
IC15 Data Handbook
1999 Jan 08
Philips Semiconductors Product specification
74F455,* 74F456Buffers/Drivers
74F455 Octal Buffer/Driver with Parity, Inverting (3-State)
74F456 Octal Buffer/Driver with Parity, Non-Inverting (3-State)
FEATURES
•High impedance NPN base inputs for reduced loading
(40µA in High and Low states)
•74F456 combines 74F244 and 74F280A functions in one package
DESCRIPTION
The 74F455 and 74F456 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.
•74F456 is a center pin version of the 74F656A
•74F456 Non-Inverting
TYPE
•3-State outputs sink 64mA and source 15mA
•24-pin plastic Slim DIP (300 mil) package
•Broadside pinout simplifies PC board layout
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
D0–D7 Data inputs 2.0/0.066 40µA/40µA
PI Parity input 1.0/0.033 20µA/20µA
OE0, OE1 Output Enable inputs (active Low) 1.0/0.033 20µA/20µA
ΣE, ΣO Parity outputs 750/106.7 15mA/64mA
Q0–Q7 Data outputs (75F455) 750/106.7 15mA/64mA
Q0–Q7 Data outputs (75F456) 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.
74F455 6.5ns 64mA
74F456 7.5ns 64mA
ORDERING INFORMATION
DESCRIPTION
24-pin plastic Slim
DIP (300mil)
24-pin plastic SOL N74456D SOT137-1
TYPICAL
PROPAGATION
DELA Y
COMMERCIAL
V
CC
T
= 0°C to +70°C
amb
N74456N SOT222-1
74F(U.L.)
HIGH/LOW
TYPICAL SUPPL Y CURRENT
(TOTAL)
RANGE
= 5V ±10%,
PKG DWG #
LOAD VALUE
HIGH/LOW
PIN CONFIGURATION – 74F455
0
OE
1
1
OE
2
PI
3
D0
4
D1
5
D2
6
V
7
CC
D3
8
D4
9
D5
10
D6
11
D7 Q
24
23
22
21
20
19
18
17
16
15
14
1312
SF00969
ΣO
ΣE
0
Q
Q
1
2
Q
GND
GND
Q3
Q
4
Q5
6
Q
7
PIN CONFIGURATION – 74F456
0
OE
1
OE
1
2
PI
3
D0
4
D1
5
D2
6
V
7
CC
D3
8
D4
9
D5
10
D6
11
D7 Q7
24
23
22
21
20
19
18
17
16
15
14
1312
SF00958
ΣO
ΣE
Q0
Q1
Q2
GND
GND
Q3
Q4
Q5
Q6
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08 853–0371 20616
2
Philips Semiconductors Product specification
74F455,* 74F456Buffers/Drivers
LOGIC SYMBOL – 74F455
45689101112
D0 D1 D2 D3 D4 D5 D6 D7
3
1
2
VCC= Pin 7
GND = Pin 18, 19
PI
OE0
OE1
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
22 21 20 17 16 15 14 13
LOGIC SYMBOL (IEEE/IEC) – 74F455
3,5,6,7,8
9,10,11,12
1
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
P3
3,5,6,7,8
9,10,11,12
EN4
3
1
2
4
5
6
8
9
10
11
12
2K
[EVEN]
[ODD]
4
SF00961
ΣE
ΣO
23
24
22
21
20
17
16
15
14
13
SF00959
LOGIC SYMBOL – 74F456
45689101112
D0 D1 D2 D3 D4 D5 D6 D7
23
24
3
1
2
VCC= Pin 7
GND = Pin 18, 19
PI
OE0
OE1
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
22 21 20 17 16 15 14 13
ΣE
ΣO
23
24
SF00960
LOGIC SYMBOL (IEEE/IEC) – 74F456
2K
3,5,6,7,8
9,10,11,12
1
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
P3
3,5,6,7,8
9,10,11,12
EN4
3
1
2
4
5
6
8
9
10
11
12
[EVEN]
[ODD]
4
23
24
22
21
20
17
16
15
14
13
SF00962
FUNCTION TABLE
INPUTS
OE0 OE1 Dn Qn Qn
L L L H L
L L H L H
H X X Z Z
X H X Z Z
H = High voltage level
L = Low voltage level
Z = High impedance “off” state
X = Don’t care
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
OUTPUTS
74F455 74F456
FUNCTION TABLE for PARITY OUTPUTS
INPUTS OUTPUTS
Number of inputs, High (PI, D0 - D7) ΣE ΣO
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
X = Don’t care
3
Philips Semiconductors Product specification
74F455,* 74F456Buffers/Drivers
LOGIC DIAGRAM for 74F455
3
PI
23
ΣE
24
ΣO
4
D0
5
D1
6
D2
8
D3
9
D4
22
0
Q
21
1
Q
20
2
Q
17
Q
3
16
Q
4
10
D5
11
D6
12
D7
1
OE
0
2
1
OE
VCC= Pin 7
GND = Pin 18, 19
* Discontinued part. Please see the Discontinued Products List.
1999 Jan 08
15
Q
5
14
6
Q
13
Q
7
SF00963
4
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