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HD74HC490 Datasheet(PDF) 4 Page - Hitachi Semiconductor

Part No. HD74HC490
Description  Dual 4-bit Decade Counters
Download  8 Pages
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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HD74HC490 Datasheet(HTML) 4 Page - Hitachi Semiconductor

   
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HD74HC490
4
AC Characteristics (C
L = 50 pF, Input tr = tf = 6 ns)
Ta = 25
°C
Ta = –40 to
+85
°C
Item
Symbol
V
CC (V)
Min Typ Max Min
Max
Unit
Test Conditions
Maximum clock
f
max
2.0
4
3
MHz
frequency
4.5
20
16
6.0
24
19
Propagation delay t
PLH
2.0
120 —
150
ns
Clock to Q
A
time
t
PHL
4.5
13
24
30
6.0
20
26
t
PLH
2.0
205 —
255
ns
Clock to Q
B QC
t
PHL
4.5
21
41
51
6.0
35
43
t
PLH
2.0
280 —
350
ns
Clock to Q
C
t
PHL
4.5
23
56
70
6.0
48
60
t
PHL
2.0
205 —
255
ns
Clear to any output
4.5
18
41
51
6.0
35
43
t
PLH
2.0
205 —
255
ns
Set-to-9 to Q
A, QD
4.5
13
41
51
6.0
35
43
t
PHL
2.0
190 —
240
ns
Set-to-9 to Q
B, QC
4.5
17
38
48
6.0
32
41
Pulse width
t
w
2.0
80
100
ns
4.5
16
6
20
6.0
14
17
Setup time
t
su
2.0
100 —
125
ns
4.5
20
1
25
6.0
17
21
Output rise/fall
t
TLH
2.0
75
95
ns
time
t
THL
4.5
5
15
19
6.0
13
16
Input capacitance
Cin
5
10
10
pF


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