Datasheet
SN54ALVTH16821, SN74ALVTH16821
2.5-V/3.3-V 20-BIT BUS-INTERFACE FLIP-FLOPS
WITH 3-STATE OUTPUTS
SCES078E – JULY 1996 – REVISED JANUARY 1999
8
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended operating free-air temperature range, V
CC
= 2.5 V ± 0.2 V
(unless otherwise noted) (see Figure 1)
SN54ALVTH16821 SN74ALVTH16821
UNIT
MIN MAX MIN MAX
UNIT
f
clock
Clock frequency 150 150 MHz
t
w
Pulse duration, CLK high or low 1.6 1.5 ns
t
Setup time data before CLK↑
Data high 1.6 1.5
ns
t
su
S
e
t
up
ti
me,
d
a
t
a
b
e
f
ore
CLK↑
Data low 2.1 2
ns
t
h
Hold time data after CLK↑
Data high 0.4 0.3
ns
t
h
Hold
time
,
data
after
CLK↑
Data low 1.1 1
ns
timing requirements over recommended operating free-air temperature range, V
CC
= 3.3 V ± 0.3 V
(unless otherwise noted) (see Figure 2)
SN54ALVTH16821 SN74ALVTH16821
UNIT
MIN MAX MIN MAX
UNIT
f
clock
Clock frequency 150 150 MHz
t
w
Pulse duration, CLK high or low 1.6 1.5 ns
t
Setup time data before CLK↑
Data high 1.6 1.5
ns
t
su
S
e
t
up
ti
me,
d
a
t
a
b
e
f
ore
CLK↑
Data low 1.6 1.5
ns
t
h
Hold time data after CLK↑
Data high 1.1 1
ns
t
h
Hold
time
,
data
after
CLK↑
Data low 1.1 1
ns
switching characteristics over recommended operating free-air temperature range, C
L
= 30 pF,
V
CC
= 2.5 V ± 0.2 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO
SN54ALVTH16821 SN74ALVTH16821
UNIT
PARAMETER
(INPUT) (OUTPUT)
MIN MAX MIN MAX
UNIT
f
max
150 150 MHz
t
PLH
CLK
Q
1 4.2 1 4.1
ns
t
PHL
CLK
Q
1 4.5 1 4.4
ns
t
PZH
OE
Q
1.5 4.7 1.5 4.6
ns
t
PZL
OE
Q
1 4.2 1 4.1
ns
t
PHZ
OE
Q
1.5 4.6 1.5 4.5
ns
t
PLZ
OE
Q
1 5 1 4.9
ns
switching characteristics over recommended operating free-air temperature range, C
L
= 50 pF,
V
CC
= 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 2)
PARAMETER
FROM TO
SN54ALVTH16821 SN74ALVTH16821
UNIT
PARAMETER
(INPUT) (OUTPUT)
MIN MAX MIN MAX
UNIT
f
max
150 150 MHz
t
PLH
CLK
Q
1 3.6 1 3.5
ns
t
PHL
CLK
Q
1 3.6 1 3.5
ns
t
PZH
OE
Q
1 4.2 1 4.1
ns
t
PZL
OE
Q
1 3.7 1 3.6
ns
t
PHZ
OE
Q
1 4.9 1 4.8
ns
t
PLZ
OE
Q
1 4.8 1 4.6
ns
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design phase of development. Characteristic data and other
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change or discontinue these products without notice.