Philips Semiconductors FAST Products Product specification
74F40Dual 4-input NAND buffer
1April 11, 1989 853–0053 96314
TYPE TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F40 3.5ns 6mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
V
CC
= 5V ±10%, T
amb
= 0°C to +70°C
14-pin plastic DIP N74F40N
14-pin plastic SO N74F40D
PIN CONFIGURATION
14
13
12
11
10
9
87
6
5
4
3
2
1
GND
V
CC
D1b
D1a
Q1
NC
D1d
D1c
D0a
D0b
Q0
NC
D0c
D0d
SF00065
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW
Dna, Dnb, Dnc, Dnd Data inputs 1.0/2.0 20µA/1.2mA
Q0, Q1 Data outputs 750/106.7 15mA/64mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOGIC DIAGRAM

V
CC
= Pin 14
GND = Pin 7
NC = Pin 3, 11
SF00081
Q0
6
1
2
4
D0a
D0b
D0c
5
D0d
Q1
8
9
10
12
D1a
D1b
D1c
13
D1d
FUNCTION TABLE
INPUTS OUTPUT
Dna Dnb Dnc Dnd Qn
L X X X H
X L X X H
X X L X H
X X X X H
H H H H L
NOTES:
1. H = High voltage level
2. L = Low voltage level
3. X = Don’t care
LOGIC SYMBOL
D1a D1bD0a D0b D0c D1c D1dD0d
Q0 Q1
6 8
1 2 4 5 9 10 12 13
V
CC
= Pin 14
GND = Pin 7
NC = Pin 3, 11
SF00082
IEC/IEEE SYMBOL
SF00083
&
6
8
1
2
4
5
9
10
12
13