SN74ALVCH244 Datasheet, PDF (8/9 Pages) Texas Instruments – OCTAL BUFFER/DRIVER WITH 3-STATE OUTPUTS

SN74ALVCH244
OCTAL BUFFER/DRIVER
WITH 3-STATE OUTPUTS
SCES112C – JULY 1997 – REVISED FEBRUARY 1999
PARAMETER MEASUREMENT INFORMATION
V_CC = 2.7 V AND 3.3 V ± 0.3 V
From Output
Under Test
CL = 50 pF
(see Note A)
500 Ω
500 Ω
6V
S1
Open
GND
TEST
tpd
tPLZ/tPZL
tPHZ/tPZH
S1
Open
6V
GND
LOAD CIRCUIT
Timing
Input
Data
Input
1.5 V
tsu
1.5 V
th
1.5 V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
2.7 V
0V
2.7 V
0V
Input
1.5 V
1.5 V
2.7 V
0V
tPLH
tPHL
Output
1.5 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.5 V
VOH
VOL
Input
tw
1.5 V
1.5 V
VOLTAGE WAVEFORMS
PULSE DURATION
2.7 V
0V
Output
Control
(low-level
enabling)
1.5 V
1.5 V
2.7 V
0V
tPZL
Output
Waveform 1
S1 at 6 V
(see Note B)
tPZH
Output
Waveform 2
S1 at GND
(see Note B)
1.5 V
1.5 V
tPLZ
3V
VOL + 0.3 V
VOL
tPHZ
VOH
VOH – 0.3 V
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
NOTES: A. CL includes probe and jig 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. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.
D. The outputs are measured one at a time with one transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPLH and tPHL are the same as tpd.
Figure 3. Load Circuit and Voltage Waveforms
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