Datasheet
SN54AHCT273, SN74AHCT273
OCTAL D-TYPE FLIP-FLOPS
WITH CLEAR
SCLS375E – JUNE 1997 – REVISED APRIL 2002
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 SN54AHCT273 SN74AHCT273
UNIT
PARAMETER
TEST
CONDITIONS
V
CC
MIN TYP MAX MIN MAX MIN MAX
UNIT
V
I
OH
= –50 A
45V
4.4 4.5 4.4 4.4
V
V
OH
I
OH
= –8 mA
4
.
5
V
3.94 3.8 3.8
V
V
I
OL
= 50 A
45V
0.1 0.1 0.1
V
V
OL
I
OL
= 8 mA
4
.
5
V
0.36 0.44 0.44
V
I
I
V
I
= 5.5 V or GND 0 V to 5.5 V ±0.1 ±1* ±1 A
I
CC
V
I
= V
CC
or GND, I
O
= 0 5.5 V 4 40 40 A
∆I
CC
†
One input at 3.4 V,
Other inputs at V
CC
or GND
5.5 V 1.35 1.5 1.5 A
C
i
V
I
= V
CC
or GND 5 V 2.5 10 10 pF
* On products compliant to MIL-PRF-38535, this parameter is not production tested at V
CC
= 0 V.
†
This is the increase in supply current for each input at one of the specified TTL voltage levels rather than 0 V or V
CC
.
timing requirements over recommended operating free-air temperature range, V
CC
= 5 V ± 0.5 V
(unless otherwise noted) (see Figure 1)
T
A
= 25°C SN54AHCT273 SN74AHCT273
UNIT
MIN MAX MIN MAX MIN MAX
UNIT
t
Pulse duration
CLR low 5 6 6
ns
t
w
Pulse
duration
CLK high or low 5 6.5 6.5
ns
t
Setup time
Data before CLK↑
5 5 5
ns
t
su
S
e
t
up
ti
me
CLR
before CLK↑
2.5 2.5 2.5
ns
t
h
Hold time, data after CLK↑ 0 0 0 ns
switching characteristics over recommended operating free-air temperature range,
V
CC
= 5 V ± 0.5 V (unless otherwise noted) (see Figure 1)
PARAMETER
FROM TO LOAD
T
A
= 25°C SN54AHCT273 SN74AHCT273
UNIT
PARAMETER
(INPUT) (OUTPUT) CAPACITANCE
MIN TYP MAX MIN MAX MIN MAX
UNIT
f
C
L
= 15 pF 75** 120** 65** 65
MHz
f
max
C
L
= 50 pF 50 75 45 45
MHz
t
PHL
CLR Q
C
L
= 15 pF 7.5** 10** 1** 11.6** 1 11.6 ns
t
PLH
CLK
Q
C
L
=15
p
F
5.5** 7.5** 1** 8.8** 1 8.8
ns
t
PHL
CLK
Q
C
L
=
15
pF
5.8** 8.2** 1** 10** 1 10
ns
t
PHL
CLR Q
C
L
= 50 pF 8.5 11 1 12.6 1 12.6 ns
t
PLH
CLK
Q
C
L
=50
p
F
6.5 8.5 1 9.8 1 9.8
ns
t
PHL
CLK
Q
C
L
=
50
pF
6.8 9.2 1 11 1 11
ns
t
sk(o)
C
L
= 50 pF 1*** 1 ns
** On products compliant to MIL-PRF-38535, this parameter is not production tested.
*** On products compliant to MIL-PRF-38535, this parameter does not apply.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.