HD74LS640FPEL 查看數據表（PDF） - Renesas Electronics
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HD74LS640FPEL Datasheet PDF : 7 Pages
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HD74LS640
Switching Characteristics
Item
Propagation delay time
Output enable time
Output disable time
(VCC = 5 V, Ta = 25°C)
Symbol Inputs Outputs min. typ. max. Unit Condition
A
tPLH
B
B
—
6
10
ns
A
—
6
10
ns
A
tPHL
B
G
tZL
G
B
—
8
15
ns
A
—
8
15
ns CL = 45 pF,
A
—
31
40
ns
RL = 667 Ω
B
—
31
40
ns
G
A
—
23
40
ns
tZH
G
B
—
23
40
ns
G
A
—
15
25
ns
tLZ
G
B
—
15
25
ns
CL = 5 pF,
G
A
—
15
25
ns
RL = 667 Ω
tHZ
G
B
—
15
25
ns
Rev.2.00, Feb.18.2005, page 3 of 6
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