CD74HCT4515E Datasheet, PDF (5/10 Pages) Texas Instruments – 4-LINE TO 16-LINE DECODERS/DEMULTIPLEXERS

CD74HCT4514, CD74HCT4515
4ĆLINE TO 16ĆLINE DECODERS/DEMULTIPLEXERS
WITH INPUT LATCHES
SCHS314D − MAY 2002 − REVISED SEPTEMBER 2004
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
Test
Point
CL
(see Note A)
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
1.3 V
3V
1.3 V
0V
VOLTAGE WAVEFORMS
PULSE DURATION
CLR
Input
CLK
1.3 V
trec
1.3 V
3V
Reference
Input
3V
1.3 V
0V
0V
tsu
th
3V
Data
Input
1.3 V
0.3 V
2.7 V
2.7 V
3V
1.3 V
0.3 V _{0 V}
0V
tr
tf
VOLTAGE WAVEFORMS
RECOVERY TIME
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
Input
In-Phase
Output
Out-of-Phase
Output
1.3 V
tPLH
1.3 V
10%
tPHL
90%
90%
tr
1.3 V
10%
tf
1.3 V
tPHL
90%
tPLH
1.3 V
10%
3V
0V
VOH
1.3 V
10% _VOL
tf
90% ^VOH
VOL
tr
Output
Control
tPZL
Output
Waveform 1
(see Note B)
tPZH
Output
Waveform 2
(see Note B)
1.3 V
1.3 V
1.3 V
3V
1.3 V
0V
tPLZ
≈VCC
10% _VOL
tPHZ
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 1. Load Circuit and Voltage Waveforms
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