Datasheet
SN54LS373, SN54LS374, SN54S373, SN54S374,
SN74LS373, SN74LS374, SN74S373, SN74S374
OCTAL D-TYPE TRANSPARENT LATCHES AND EDGE-TRIGGERED FLIP-FLOPS
SDLS165B – OCTOBER 1975 – REVISED AUGUST 2002
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
†
SN54LS’ SN74LS’
UNIT
PARAMETER
TEST
CONDITIONS
†
MIN TYP
‡
MAX MIN TYP
‡
MAX
UNIT
V
IH
High-level input voltage 2 2 V
V
IL
Low-level input voltage 0.7 0.8 V
V
IK
Input clamp voltage V
CC
= MIN, I
I
= –18 mA –1.5 –1.5 V
V
OH
High level out
p
ut voltage
V
CC
= MIN, V
IH
= 2 V,
24
34
24
31
V
V
OH
High
-
level
output
voltage
CC
,
V
IL
= V
IL
max,
IH
,
I
OH
= MAX
2
.
4
3
.
4
2
.
4
3
.
1
V
V
OL
Low level out
p
ut voltage
V
CC
= MIN, V
IH
= 2 V,
I
OL
= 12 mA 0.25 0.4 0.25 0.4
V
V
OL
Low
-
level
output
voltage
CC
,
V
IL
= V
IL
max
IH
,
I
OL
= 24 mA 0.35 0.5
V
I
OZH
Off-state output current, V
CC
= MAX, V
IH
= 2 V,
20
20
A
I
OZH
,
high-level voltage applied
CC
,
V
O
= 2.7 V
IH
,
20
20
A
I
OZL
Off-state output current, V
CC
= MAX, V
IH
= 2 V,
20
20
A
I
OZL
,
low-level voltage applied
CC
,
V
O
= 0.4 V
IH
,
–
20
–
20
A
I
I
Input current at maximum
V
CC
= MAX
V
I
=7V
01
01
mA
I
I
input voltage
V
CC
=
MAX
,
V
I
=
7
V
0
.
1
0
.
1
mA
I
IH
High-level input current V
CC
= MAX, V
I
= 2.7 V 20 20 A
I
IL
Low-level input current V
CC
= MAX, V
I
= 0.4 V –0.4 –0.4 mA
I
OS
Short-circuit output current
§
V
CC
= MAX –30 –130 –30 –130 mA
I
CC
Su
pp
ly current
V
CC
= MAX,
’LS373 24 40 24 40
mA
I
CC
Supply
current
CC
,
Output control at 4.5 V
’LS374 27 40 27 40
mA
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
‡
All typical values are at V
CC
= 5 V, T
A
= 25°C.
§
Not more than one output should be shorted at a time and duration of the short circuit should not exceed one second.
switching characteristics, V
CC
= 5 V, T
A
= 25°C (see Figure 1)
PARAMETER
FROM TO
TEST CONDITIONS
’LS373 ’LS374
UNIT
PARAMETER
(INPUT) (OUTPUT)
TEST
CONDITIONS
MIN TYP MAX MIN TYP MAX
UNIT
f
max
R
L
= 667 Ω C
L
= 45 pF,
See Note 3
35 50 MHz
t
PLH
Data
Any Q
R
L
= 667 Ω C
L
= 45 pF,
12 18
ns
t
PHL
Data
Any
Q
L L
,
See Note 3
12 18
ns
t
PLH
CorCLK
Any Q
R
L
= 667 Ω C
L
= 45 pF,
20 30 15 28
ns
t
PHL
C
or
CLK
Any
Q
L L
,
See Note 3
18 30 19 28
ns
t
PZH
OC
Any Q
R
L
= 667 Ω C
L
= 45 pF,
15 28 20 26
ns
t
PZL
OC
Any
Q
L L
,
See Note 3
25 36 21 28
ns
t
PHZ
15
25
15
28
t
PHZ
OC
Any Q
R
L
667 Ω C
L
5
p
F
15
25
15
28
ns
t
PLZ
OC
An
y
Q
R
L
=
667
Ω
C
L
=
5
pF
12
20
12
20
ns
t
PLZ
12
20
12
20
NOTE 3: Maximum clock frequency is tested with all outputs loaded.
f
max
= maximum clock frequency
t
PLH
= propagation delay time, low-to-high-level output
t
PHL
= propagation delay time, high-to-low-level output
t
PZH
= output enable time to high level
t
PZL
= output enable time to low level
t
PHZ
= output disable time from high level
t
PLZ
= output disable time from low level