HD74HC640, HD74HC643
Octal Bus Transceivers (with 3-state outputs)
REJ03D0637-0200 (Previous ADE-205-517)
Rev.2.00 Mar...
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: tpd = 12 ns typ (CL = 50 pF) High Output Current: Fanout of 15 LSTTL Loads
Wide Operating
Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (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)
HD74HC643RPEL
PRSP0020DC-A RP (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 LL LH HX 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
HD74HC640, HD74HC643
Pin Arrangement
HD74HC64...