Datasheet
SCAS520H − AUGUST 1995 − REVISED OCTOBER 2003
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
V
CC
T
A
= 25°C SN54ACT74 SN74ACT74
UNIT
PARAMETER
TEST CONDITIONS
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
I
OH
= −50 A
4.5 V 4.4 4.49 4.4 4.4
I
OH
= −50 µA
5.5 V 5.4 5.49 5.4 5.4
V
OH
I
OH
= −24 mA
4.5 V 3.86 3.7 3.76
V
V
OH
I
OH
= −24 mA
5.5 V 4.86 4.7 4.76
V
I
OH
= −50 mA
†
5.5 V 3.86
I
OH
= −75 mA
†
5.5 V 3.85
I
OL
= 50 A
4.5 V 0.001 0.1 0.1 0.1
I
OL
= 50 µA
5.5 V 0.001 0.1 0.1 0.1
V
OL
I
OL
= 24 mA
4.5 V 0.36 0.5 0.44
V
V
OL
I
OL
= 24 mA
5.5 V 0.36 0.5 0.44
V
I
OL
= 50 mA
†
5.5 V 1.65
I
OL
= 75 mA
†
5.5 V 1.65
I
I
V
I
= V
CC
or GND 5.5 V ±0.1 ±1 ±1 µA
I
CC
V
I
= V
CC
or GND, I
O
= 0 5.5 V 2 40 20 µA
∆I
CC
‡
One input at 3.4 V,
Other inputs at GND or V
CC
5.5 V 0.6 1.6 1.5 mA
C
i
V
I
= V
CC
or GND 5 V 3 pF
†
Not more than one output should be tested at a time, and the duration of the test should not exceed 2 ms.
‡
This is the increase in supply current for each input that is at one of the specified TTL voltage levels, rather than 0 V or V
CC
.
timing characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 1)
T
A
= 25°C SN54ACT74 SN74ACT74
UNIT
MIN MAX MIN MAX MIN MAX
UNIT
f
clock
Clock frequency 145 85 125 MHz
t
w
Pulse duration
PRE or CLR low 5 7 6
ns
t
w
Pulse duration
CLK
5 7 6
ns
t
su
Setup time, data before CLK↑
Data 3 4 3.5
ns
t
su
Setup time, data before CLK↑
PRE
or CLR inactive 0 0.5 0
ns
t
h
Hold time, data after CLK↑ 1 1 1 ns
switching characteristics over recommended operating free-air temperature (unless otherwise
noted) (see Figure 1)
FROM
TO
SN54ACT74
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
T
A
= 25°C
MIN
MAX
UNIT
PARAMETER
(INPUT)
(OUTPUT)
MIN TYP MAX
MIN
MAX
UNIT
f
max
145 210 85 MHz
t
PLH
PRE or CLR
Q or Q
1 5.5 9.5 1 11.5
ns
t
PHL
PRE or CLR Q or Q
1 6 10 1 12.5
ns
t
PLH
CLK
Q or Q
1 7.5 11 1 14
ns
t
PHL
CLK
Q or Q
1 6 10 1 12
ns