Philips N74F456N, N74F456D Datasheet
74F455*, 74F456
Buffers/drivers
Product specification
Supersedes data of 1990 Nov 26
IC15 Data Handbook
1999 Jan 08
INTEGRATED CIRCUITS
* Discontinued part. Please see the Discontinued Product List.
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)
2
1999 Jan 08 853–0371 20616
* Discontinued part. Please see the Discontinued Products List.
FEA TURES
•High impedance NPN base inputs for reduced loading
(40µA in High and Low states)
•74F456 combines 74F244 and 74F280A functions in one package
•74F456 is a center pin version of the 74F656A
•74F456 Non-Inverting
•3-State outputs sink 64mA and source 15mA
•24-pin plastic Slim DIP (300 mil) package
•Broadside pinout simplifies PC board layout
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.
TYPE
TYPICAL
PROPAGATION
DELA Y
TYPICAL SUPPL Y CURRENT
(TOT AL)
74F455 6.5ns 64mA
74F456 7.5ns 64mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL
RANGE
V
CC
= 5V ±10%,
T
amb
= 0°C to +70°C
PKG DWG #
24-pin plastic Slim
DIP (300mil)
N74456N SOT222-1
24-pin plastic SOL N74456D 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 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.
PIN CONFIGURATION – 74F455
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
Q5
Q
4
Q3
Q
2
Q
1
Q
0
ΣE
ΣO
GND
GND
V
CC
SF00969
PIN CONFIGURATION – 74F456
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
GND
GND
V
CC
SF00958
Philips Semiconductors Product specification
74F455,* 74F456Buffers/Drivers
1999 Jan 08
3
* Discontinued part. Please see the Discontinued Products List.
LOGIC SYMBOL – 74F455
D0 D1 D2 D3 D4 D5 D6 D7
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
OE0
OE1
PI
ΣE
ΣO
45689101112
23
24
1
2
3
22 21 20 17 16 15 14 13
SF00959
VCC= Pin 7
GND = Pin 18, 19
LOGIC SYMBOL (IEEE/IEC) – 74F455
SF00961
4
6
8
9
3,5,6,7,8
9,10,11,12
1
2
2K
21
20
17
Z6
5
22
10
11
12
15
14
13
16
4
24
23
3
Z5
Z8
Z7
Z9
Z11
Z10
Z12
1
EN4
P3
3,5,6,7,8
9,10,11,12
[EVEN]
[ODD]
LOGIC SYMBOL – 74F456
D0 D1 D2 D3 D4 D5 D6 D7
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
OE0
OE1
PI
ΣE
ΣO
45689101112
23
24
1
2
3
22 21 20 17 16 15 14 13
SF00960
VCC= Pin 7
GND = Pin 18, 19
LOGIC SYMBOL (IEEE/IEC) – 74F456
SF00962
4
6
8
9
3,5,6,7,8
9,10,11,12
1
2
2K
21
20
17
Z6
5
22
10
11
12
15
14
13
16
4
24
23
3
Z5
Z8
Z7
Z9
Z11
Z10
Z12
1
EN4
P3
3,5,6,7,8
9,10,11,12
[EVEN]
[ODD]
FUNCTION T ABLE
INPUTS
OUTPUTS
74F455 74F456
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
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
Philips Semiconductors Product specification
74F455,* 74F456Buffers/Drivers
1999 Jan 08
4
* Discontinued part. Please see the Discontinued Products List.
LOGIC DIAGRAM for 74F455
3
4
5
6
8
9
10
11
12
1
2
22
21
20
17
16
15
14
13
23
24
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
OE
0
OE
1
PI
SF00963
VCC= Pin 7
GND = Pin 18, 19
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