HD74HC640 Datasheet, PDF (1/11 Pages) Hitachi Semiconductor – Octal Bus Transceivers (with 3-state outputs)

HD74HC640, HD74HC643
Octal Bus Transceivers (with 3-state outputs)
REJ03D0637-0200
(Previous ADE-205-517)
Rev.2.00
Mar 30, 2006
Description
Each device has an active enable G and a direction control input, DIR. When DIR is high, data flows from the A inputs
to the B outputs. When DIR is low, data flows from the B inputs to the A outputs. The HD74HC640 transfers inverted
data from one bus to other and the HD74HC643 transfers inverted data from the A bus to the B bus and true data from
the B bus to the A bus.
Features
• High Speed Operation: t_pd = 12 ns typ (C_L = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: V_CC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: I_CC (static) = 4 µA max (Ta = 25°C)
• Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HC640P
DILP-20 pin
PRDP0020AC-B
(DP-20NEV)
P
HD74HC640FPEL SOP-20 pin (JEITA)
PRSP0020DD-B
(FP-20DAV)
FP
HD74HC640RPEL
SOP-20 pin (JEDEC)
PRSP0020DC-A
RP
HD74HC643RPEL
(FP-20DBV)
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
—
EL (2,000 pcs/reel)
EL (1,000 pcs/reel)
Function Table
Control Inputs
G
DIR
L
L
L
H
H
X
H : high level
L : low level
X : irrelevant
HD74HC640
B data to A bus
A data to B bus
Isolation
Operation
HD74HC643
B data to A bus
A data to B bus
Isolation
Rev.2.00 Mar 30, 2006 page 1 of 10