74HCT640N NXP Semiconductors, 74HCT640N Datasheet - Page 3

• Manufacturer Part Number: 74HCT640N
• Description: IC, 74HCT CMOS, 74HCT640, DIP20, 5V
• Manufacturer: NXP Semiconductors

Specifications of 74HCT640N

• Supply Voltage Range: 4.5V To 5.5V
• Logic Case Style: DIP
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC (18-Jun-2010)
• Package / Case: DIP
• Base Number: 74
• Ic Generic: RoHS Compliant

Philips Semiconductors
PIN DESCRIPTION
March 1988
PIN NO.
1
2, 3, 4, 5, 6, 7, 8, 9
10
18, 17, 16, 15, 14, 13, 12, 11 B
19
20
Octal bus transceiver; 3-state; inverting
Fig.1 Pin configuration.
Fig.3 IEC logic symbol.
SYMBOL NAME AND FUNCTION
DIR
A
GND
OE
V
0
0
CC
to A
to B
7
7
FUNCTION TABLE
Note
1. H = HIGH voltage level
OE
direction control
data inputs/outputs
ground (0 V)
data inputs/outputs
output enable input (active LOW)
positive supply voltage
H
L
L
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
inputs
Fig.2 Logic symbol.
DIR
H
X
L
A
A=B
inputs
Z
3
n
inputs/outputs
B
inputs
B=A
Z
n
Fig.4 Functional diagram.
74HC/HCT640
Product specification