TC74AC257P 查看數據表（PDF） - Toshiba
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TC74AC257P Datasheet PDF : 9 Pages
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TC74AC257,258P/F/FN
AC Characteristics (CL = 50 pF, RL = 500 Ω, input: tr = tf = 3 ns)
Characteristics
Propagation delay
time
(A, B-Y, Y )
Symbol
tpLH
tpHL
Test Condition
⎯
VCC (V)
3.3 ± 0.3
5.0 ± 0.5
Ta = 25°C
Ta = −40~85°C
Unit
Min Typ. Max Min Max
⎯
7.0 14.3 1.0 16.3
ns
⎯
4.7
7.5
1.0
8.5
Propagation delay
time
tpLH
(SELECT-Y, Y )
tpHL
3.3 ± 0.3 ⎯
8.6 17.2 1.0 19.6
⎯
ns
5.0 ± 0.5 ⎯
5.5
9.1
1.0 10.4
Output enable time
Output disable time
Input capacitance
Output capacitance
Power dissipation
capacitance
tpZL
tpHZ
tpLZ
tpHZ
CIN
COUT
CPD
(Note)
⎯
⎯
⎯
⎯
⎯
3.3 ± 0.3 ⎯
5.0 ± 0.5 ⎯
3.3 ± 0.3 ⎯
5.0 ± 0.5 ⎯
⎯
⎯
⎯
7.3 14.0 1.0 16.0
ns
5.0 7.9 1.0 9.0
5.6 9.6 1.0 11.0
ns
5.1 7.9 1.0 9.0
5
10
⎯
10
pF
10
⎯
⎯
⎯
pF
28
⎯
⎯
⎯
pF
Note:
CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
ICC (opr) = CPD･VCC･fIN + ICC/4 (per bit)
5
2007-10-01
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