HD74LS293 Datasheet, PDF (4/8 Pages) Hitachi Semiconductor – 4-bit Binary Counters

HD74LS293
Switching Characteristics
Item
Symbol Inputs Outputs
min.
typ.
Maximum count
A
frequency
ƒ_max
B
Q_A
32
42
Q_B
16
—
t_PLH
A
t_PHL
Q_A
—
10
—
12
t_PLH
A
t_PHL
Q_D
—
46
—
46
Propagation delay
t_PLH
B
time
t_PHL
Q_B
—
10
—
14
t_PLH
B
t_PHL
Q_C
—
21
—
23
t_PLH
B
t_PHL
Q_D
—
34
—
34
t_PHL
Set-to-0 Q_A to Q_D
—
26
Timing Method
t_w
R0
1.3 V
A or B
Input
1.3 V
t_su
1.3 V
t_w
1.3 V
max.
—
—
16
18
70
70
16
21
32
35
51
51
40
(V_CC = 5 V, Ta = 25°C)
Unit
Condition
MHz
ns
ns
C_L = 15 pF,
ns
R_L = 2 kΩ
ns
ns
ns
3V
0V
3V
0V
Rev.3.00, Jul.15.2005, page 4 of 7