Datasheet

SN54273, SN54LS273, SN74273, SN74LS273
OCTAL D-TYPE FLIP-FLOP WITH CLEAR
SDLS090 – OCTOBER 1976 – REVISED MARCH 1988
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
max
Maximum clock frequency
C
30 40 MHz
t
PHL
Propagation delay time, high-to-low-level output from clear
C
L
= 15 pF,
R
L
= 400 Ω
18 27 ns
t
PLH
Propagation delay time, low-to-high-level output from clock
R
L
=
400
Ω
,
See Note 3
17 27 ns
t
PHL
Propagation delay time, high-to-low-level output from clock
See
Note
3
18 27 ns
NOTE 3: Load circuits and voltage waveforms are shown in Section 1.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
: SN54LS273 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74LS273 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NOTE 1: Voltage values are with respect to network ground terminal.
recommended operating conditions
SN54LS273 SN74LS273
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
Supply voltage, V
CC
4.5 5 5.5 4.75 5 5.25 V
High-level output current, I
OH
–400 –400 µA
Low-level output current, I
OL
4 8 mA
Clock frequency, f
clock
0 30 0 30 MHz
Width of clock or clear pulse, t
w
20 20 ns
Setu
p
time t
Data input 20↑ 20↑
ns
Set
u
p
time
,
t
su
Clear inactive state 25↑ 25↑
ns
Data hold time, t
h
5↑ 5↑ ns
Operating free-air temperature, T
A
–55 125 0 70 °C
↑The arrow indicates that the rising edge of the clock pulse is used for reference.