CD54HC190 Datasheet, PDF (17/26 Pages) Texas Instruments – SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL

CD54HC190, CD74HC190
CD54HC191, CD74HC191, CD54HCT191, CD74HCT191
SYNCHRONOUS UP/DOWN COUNTERS WITH DOWN/UP MODE CONTROL
SCHS275E − MARCH 2002 − REVISED OCTOBER 2003
PARAMETER MEASUREMENT INFORMATION − ’HC190, ’HC191
From Output
Under Test
Test
Point
CL
(see Note A)
RL = 1 kΩ
VCC
S1
S2
PARAMETER
tPZH
ten
tPZL
tdis
tPHZ
tPLZ
tpd or tt
S1
Open
Closed
Open
Closed
Open
S2
Closed
Open
Closed
Open
Open
LOAD CIRCUIT
Input
tw
50% VCC
50% VCC
VOLTAGE WAVEFORMS
PULSE DURATION
VCC
0V
LOAD
Input
CLK
50% VCC
trec
50% VCC
VOLTAGE WAVEFORMS
RECOVERY TIME
VCC
0V
VCC
0V
Reference
Input
50% VCC
VCC
0V
Data
Input
50%
10%
tsu
90%
tr
th
90%
VCC
5100%%VC0CV
tf
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
Input
In-Phase
Output
Out-of-Phase
Output
50% VCC
tPLH
50%
10%
tPHL
90%
90%
50% VCC
tPHL
90%
tr
501%0%VCC
tf
tPLH
50%
10%
VCC
0V
VOH
5100%%VCVCOL
tf
90% ^VOH
VOL
tr
Output
Control
tPZL
Output
Waveform 1
(see Note B)
tPZH
Output
Waveform 2
(see Note B)
50% VCC
VCC
50% VCC
0V
50% VCC
tPLZ
≈VCC
10% _VOL
tPHZ
50% VCC
90%
VOH
≈0 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
VOLTAGE WAVEFORMS
OUTPUT ENABLE AND DISABLE TIMES
NOTES: A. CL includes probe and test-fixture capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr = 6 ns, tf = 6 ns.
D. For clock inputs, fmax is measured with the input duty cycle at 50%.
E. The outputs are measured one at a time with one input transition per measurement.
F. tPLZ and tPHZ are the same as tdis.
G. tPZL and tPZH are the same as ten.
H. tPLH and tPHL are the same as tpd.
Figure 4. Load Circuit and Voltage Waveforms
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