MC74HC393A_14 Datasheet, PDF (4/8 Pages) ON Semiconductor – Dual 4-Stage Binary Ripple Counter

MC74HC393A
TIMING REQUIREMENTS (Input t_r = t_f = 6 ns)
Symbol
Parameter
t_rec Minimum Recovery Time, Reset Inactive to Clock
(Figure 2)
t_w
Minimum Pulse Width, Clock
(Figure 1)
t_w
Minimum Pulse Width, Reset
(Figure 2)
t_r, t_f Maximum Input Rise and Fall Times
(Figure 1)
Guaranteed Limit
V_CC
–55 to
V
25_C
v85_C v125_C Unit
2.0
25
30
40
ns
3.0
15
20
30
4.5
10
13
15
6.0
9
11
13
2.0
75
3.0
27
4.5
15
6.0
13
95
110
ns
32
36
19
22
15
19
2.0
75
3.0
27
4.5
15
6.0
13
95
110
ns
32
36
19
22
15
19
2.0
1000
1000
1000
ns
3.0
800
800
800
4.5
500
500
500
6.0
400
400
400
PIN DESCRIPTIONS
INPUTS
Clock (Pins 1, 13)
Clock input. The internal flip−flops are toggled and the
counter state advances on high−to−low transitions of the
clock input.
OUTPUTS
Q1, Q2, Q3, Q4 (Pins 3, 4, 5, 6, 8, 9, 10, 11)
Parallel binary outputs Q4 is the most significant bit.
CONTROL INPUTS
Reset (Pins 2, 12)
Active−high, asynchronous reset. A separate reset is
provided for each counter. A high at the Reset input prevents
counting and forces all four outputs low.
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