Datasheet

SN54HC646, SN74HC646
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS150C – DECEMBER 1982 – REVISED MARCH 2003
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range (unless otherwise
noted)
V
CC
T
A
= 25°C SN54HC646 SN74HC646
UNIT
V
CC
MIN MAX MIN MAX MIN MAX
UNIT
2 V 6 4.3 5.5
f
clock
Clock frequency
4.5 V
31 22 27
MHz
6 V 36 25 31
2 V 80 115 95
t
w
Pulse duration, CLKBA or CLKAB high or low
4.5 V
16 23 19
ns
6 V 14 20 16
↑ ↑
2 V 100 150 125
t
su
Setup time, A before CLKAB
↑
or B before CLKBA
↑
4.5 V 20 30 25
ns
6 V 17 26 21
↑ ↑
2 V 5 5 5
t
h
Hold time, A after CLKAB
↑
or B after CLKBA
↑
4.5 V 5 5 5
ns
6 V 5 5 5
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design phase of development. Characteristic data and other
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change or discontinue these products without notice.