HD74LS279
Electrical Characteristics
(Ta = –20 to +75 °C)
Item
Input voltage
Symbol
V
IH
V
IL
V
OH
Output voltage
V
OL
I
IH
I
IL
I
I
min.
2.0
—
2.7
—
—
—
—
—
–20
—
—
typ.*
—
—
—
—
—
max.
—
0.8
—
0.4
0.5
20
–0.4
0.1
–100
7
–1.5
Unit
V
V
V
V
µA
mA
mA
mA
mA
V
V
CC
= 4.75 V, V
IH
= 2 V, V
IL
= 0.8 V,
I
OH
= –400
µA
I
OL
= 4 mA V
CC
= 4.75 V, V
IH
= 2 V,
I
OL
= 8 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
CC
= 5.25 V
V
CC
= 5.25 V
V
CC
= 4.75 V, I
IN
= –18 mA
Condition
Input current
Short-circuit output current
I
OS
—
Supply current**
I
CC
3.8
Input clamp voltage
V
IK
—
Notes: * V
CC
= 5 V, Ta = 25°C
** I
CC
is measured with all
R
inputs grounded, all
S
inputs at 4.5 V, and all outputs open.
Switching Characteristics
(V
CC
= 5 V, Ta = 25°C)
Item
Propagation delay time
Symbol
t
PLH
t
PHL
t
PHL
Inputs
S
R
Output
Q
min.
—
—
—
typ.
12
13
15
max.
22
21
27
Unit
ns
Condition
C
L
= 15 pF, R
L
= 2 kΩ
Note: Refer to Test Circuit and Waveform of the Common Item "TTL Common Matter (Document No.: REJ27D0005-
0100)".
Rev.4.00, May 10, 2006, page 3 of 4