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HD74LS193 Datasheet, PDF (7/12 Pages) Hitachi Semiconductor – Synchronous Up/Down 4-bit Binary Counters(dual clock lines) | |||
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HD74LS193
Waveforms 1
Æmax, tPLH, tPHL, (Count Up)
tTLH
tTHL
Count
90% 90%
3V
Up
10% 1.3V 1.3V 10%
1.3V
1.3V
0V
tw (H)
tw (L)
tPHL
tPLH
(Measure at
tn + 2)
VOH
QA
(Measure at
tn + 1)
1.3V
tPHL
tPLH (Measure at tn + 2)
VOL
(Measure at
tn + 4)
VOH
QB
1.3V
1.3V
Outputs
QC
VOL
tPHL
tPLH (Measure at tn + 4)
(Measure at
tn + 8)
VOH
1.3V
1.3V
VOL
tPHL
tPLH (Measure at tn + 8)
(Measure at
tn + 16)
VOH
QD
1.3V
1.3V
VOL
(Measure before tPHL
tPLH (Measure at tn + 16)
1 clock of tn + 16)
Carry
VOH
1.3V
1.3V
VOL
Notes:
1. Input pulse; tTLH, tTHL ⤠7 ns, Duty Cycle ⤠50%, PRR = 500 kHz (Data input). PRR = 1 MHz
(except data input)
2. for Æmax tTLH = tTHL ⤠2.5 ns.
3. tn is reference bit time when all outputs are low.
Rev.2.00, Feb.18.2005, page 7 of 11
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