HD74HC190 Datasheet, PDF (8/13 Pages) Hitachi Semiconductor – Synchronous Up/Down Decade,4-bit Binary Counter(Single Clock Line)

HD74HC190, HD74HC191
Test Circuit
VCC
Input
Pulse Generator
Zout = 50 Ω
VCC
Output
G
Load
Ripple
Clock
Down/Up
Clock Max/Min
A
B
C
QA to QD
D
Output
Output
C_L = 50 pF
C_L = 50 pF
C_L = 50 pF
Note : 1. C_L includes probe and jig capacitance.
Waveforms
• Wavwform – 1
Data
Load
tr
50%
tsu
50%
10%
90%
tr
tf
50%
tsu
50%
10%
90%
tr
Output
(Corresponding to data input)
Note : 1. Input : PRR ≤ 1 MHz, Zo = 50 Ω, t_r ≤ 6 ns, t_f ≤ 6 ns
V_CC
0V
V_CC
0V
VOH
VOL
Rev.3.00, Jan 31, 2006 page 8 of 12