HD74LS257
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Input voltage
Symbol
V
IH
V
IL
V
OH
Output voltage
V
OL
S
S except
S
S except
S
S except
Output current
I
IH
I
IL
I
I
I
OZ
min.
2.0
—
2.4
—
—
—
—
—
—
—
—
—
—
typ.*
—
—
—
—
—
—
—
—
—
—
—
—
—
max.
—
0.8
—
0.5
0.4
40
20
–0.8
–0.4
0.2
0.1
20
–20
Unit
V
V
V
V
µA
mA
mA
µA
V
CC
= 4.75 V, V
IH
= 2 V, V
IL
= 0.8 V,
I
OH
= –2.6 mA
I
OL
= 8 mA V
CC
= 4.75 V, V
IH
= 2 V,
I
OL
= 4 mA V
IL
= 0.8 V
V
CC
= 5.25 V, V
I
= 2.7 V
V
CC
= 5.25 V, V
I
= 0.4 V
V
CC
= 5.25 V, V
I
= 7 V
V
O
= 2.4 V
V
O
= 0.4 V
V
CC
= 5.25 V, V
IH
= 2 V
Condition
Input
current
Short-circuit output current
I
OS
–30
—
–130
mA
V
CC
= 5.25 V
All outputs high
—
5.9
10
Supply
I
CC
mA
V
CC
= 5.25 V
All outputs low
—
9.2
16
current**
All outputs off
—
10
19
Input clamp voltage
V
IK
—
—
–1.5
V
V
CC
= 4.75 V, I
IN
= –18 mA
Notes: * V
CC
= 5 V, Ta = 25°C
** I
CC
is measured with all outputs open and all possible inputs grounded while achieving the stated output
conditions.
Switching Characteristics
(V
CC
= 5 V, Ta = 25°C)
Item
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
ZH
t
ZL
t
HZ
t
LZ
Inputs
A, B
S
OC
OC
Output
Y
Y
Y
Y
min.
—
—
—
—
—
—
—
—
typ.
12
12
14
14
20
20
18
16
max.
18
18
21
21
30
30
30
25
Unit
ns
ns
ns
ns
C
L
= 5 pF,
R
L
= 2 kΩ
C
L
= 15 pF,
R
L
= 2 kΩ
Condition
Propagation delay time
Output enable time
Output disable time
Rev.3.00, Jul.15.2005, page 3 of 5
RENESAS [ RENESAS TECHNOLOGY CORP ]
