HD74HC192 Datasheet, PDF (11/14 Pages) Hitachi Semiconductor – Synchronous Up/Down Decade,4-bit Binary Counter(Dual Clock Line)

HD74HC192, HD74HC193
• Waveform – 4 (HD74HC193)
tr
tf
Count
Down
50% 50%
50%
tw (H)
tw (L) _{tPLH (Measure at tn+0)}
50%
tPHL (Measure at tn+1)
QA
50%
50%
tPLH (Measure at tn+0)
tPHL (Measure at tn+2)
QB
50%
50%
tPLH (Measure at tn+0)
tPHL (Measure at tn+4)
QC
50%
50%
tPLH (Measure at tn+0)
tPHL (Measure at tn+8)
QD
50%
50%
Borrow
(Measure before tPHL
1 clock of tn+0)
tPLH (Measure at tn+0)
90%
50%
10%
90%
50%
tTHL
tTLH
Notes : 1. Input pulse : PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
2. tn is reference bit time when outputs are H, L, L, H
V_CC
0V
VOH
VOL
VOH
VOL
VOH
VOL
VOH
VOL
VOH
VOL
Rev.3.00, Jan 31, 2006 page 11 of 13