HD74LS156 Datasheet, PDF (4/7 Pages) Hitachi Semiconductor – Dual 2-line-to-4-Line Decoders / Demultiplexers(with open collector outputs)

HD74LS156
Switching Characteristics
Item
Propagation
delay time
Symbol
t_PLH
t_PHL
t_PLH
t_PHL
t_PLH
t_PHL
Inputs
A, B, 2C,
1G or 2G
A, B, 2C,
1G or 2G
A or B
A or B
1C
1C
Output
Y
Level of
logic
2
Y
2
Y
3
Y
3
Y
3
Y
3
min.
—
—
—
—
—
—
(V_CC = 5 V, Ta = 25°C)
typ. max. Unit Condition
25
40
34
51
31
46
ns
C_L = 15 pF,
R_L = 2 kΩ
34
51
32
48
32
48
Testing Method
Test Circuit
V_CC
4.5V
P.G.
Zout = 50Ω
Input
1Y0
1G ^1Y1
1C 1Y2
B 1Y3
A _2Y0
2C _2Y1
2G _2Y2
2Y3
Note: C_L includes probe and jig capacitance.
RL
Output
CL
Rev.3.00, Jul.13.2005, page 4 of 6