Datasheet

SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645
OCTAL BUS TRANSCEIVERS
WITH 3-STATE OUTPUTS
SDAS278 – JANUARY 1995
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 4.5 V to 5.5 V,
C
L
= 50 pF,
R1 = 500 Ω
,
R2 = 500 Ω,
T
A
= MIN to MAX
†
UNIT
SN54AS645 SN74AS645
MIN MAX MIN MAX
t
PLH
AorB
BorA
2 11 2 9.5
ns
t
PHL
A
or
B
B
or
A
2 10.5 2 9
ns
t
PZH
OE
AorB
2 12 2 11
ns
t
PZL
OE
A
or
B
2 12 2 10
ns
t
PHZ
OE
AorB
2 8 2 7
ns
t
PLZ
OE
A
or
B
2 13 2 12
ns
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.