Datasheet

SN54ABT16821, SN74ABT16821
20-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCBS216B – JUNE 1992 – REVISED JANUARY 1997
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
V
CC
= 5 V,
T
A
= 25°C
SN54ABT16821 SN74ABT16821
UNIT
MIN MAX MIN MAX MIN MAX
f
clock
Clock frequency 0 150 0 150 0 150 MHz
t
w
Pulse duration, CLK high or low 3.3 3.3 3.3 ns
t
su
Setup time, data before CLK↑ 1.8 1.8 1.8 ns
t
h
Hold time, data after CLK↑ 1.3 1.3 1.3 ns
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
SN54ABT16821 SN74ABT16821
UNIT
(INPUT)
(OUTPUT)
MIN TYP MAX MIN MAX MIN MAX
f
max
150 150 150 MHz
t
PLH
CLK
Q
1.3 3.7 5.1 1.3 6.7 1.3 6.1
ns
t
PHL
CLK
Q
1.6 3.9 5.1 1.6 5.8 1.6 5.4
ns
t
PZH
OE
Q
1.1 3.2 4.7 1.1 5.8 1.1 5.7
ns
t
PZL
OE
Q
1.6 3.8 5 1.6 5.7 1.6 5.6
ns
t
PHZ
OE
Q
2 4.5 5.7 2 6.6 2 6.5
ns
t
PLZ
OE
Q
1.8 4.1 5.8 1.8 8.4 1.8 7.1
ns
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