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HD74LS191 数据表(PDF) 5 Page - Renesas Technology Corp

部件名 HD74LS191
功能描述  Synchronous Up / Down 4-bit Binary Counter (single clock line)
PDF  11 Pages
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制造商  RENESAS [Renesas Technology Corp]
网页  http://www.renesas.com
标志 RENESAS - Renesas Technology Corp

HD74LS191 数据表(HTML) 5 Page - Renesas Technology Corp

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HD74LS191
Rev.2.00, Feb.18.2005, page 5 of 10
Switching Characteristics
(VCC = 5 V, Ta = 25°C)
Item
Symbol
Inputs
Outputs
min.
typ.
max.
Unit
Condition
Maximum clock
frequency
ƒmax
Clock
QA, QB, QC, QD
20
25
—
MHz
tPLH
—
22
33
tPHL
Load
QA, QB, QC, QD
—
33
50
ns
tPLH
—
20
32
tPHL
Data A,
B, C, D
QA, QB, QC, QD
—
27
40
ns
tPLH
—
13
20
tPHL
Clock
Ripple Clock
—
16
24
ns
tPLH
—
16
24
tPHL
Clock
QA, QB, QC, QD
—
24
36
ns
tPLH
—
28
42
tPHL
Clock
Max / Min
—
37
52
ns
tPLH
—
30
45
tPHL
Down /
Up
Ripple Clock
—
30
45
ns
tPLH
—
21
33
tPHL
Down /
Up
Max / Min
—
22
33
ns
tPLH
—
21
33
Propagation
delay time
tPHL
Enable
Ripple Clock
—
22
33
ns
CL = 15 pF,
RL = 2 k
Ω



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