SN74LV244PW Datasheet, PDF (5/10 Pages) Texas Instruments – OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS

SN54LV244, SN74LV244
OCTAL BUFFERS/DRIVERS
WITH 3ĆSTATE OUTPUTS
SCLS194C − FEBRUARY 1993 − REVISED APRIL 1996
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL = 50 pF
(see Note A)
1 kΩ
S1
1 kΩ
LOAD CIRCUIT
tw
Input
Vm
Vm
VOLTAGE WAVEFORMS
PULSE DURATION
Vz
Open
GND
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
S1
Open
Vz
GND
WAVEFORM
CONDITION
Vm
Vi
Vz
VCC = 4.5 V
to 5.5 V
0.5 × VCC
VCC
2 × VCC
VCC = 2.7 V
to 3.6 V
1.5 V
2.7 V
6V
Timing Input
Vi
Vm
0V
Vi
Data Input
0V
tsu
Vm
th
Vi
Vm
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Input
tPLH
Output
Output ^tPHL
Vm
Vm
Vm
Vi
Vm
0V
tPHL
VOH
Vm
VOL
tPLH
VOH
Vm
VOL
Output
Control
tPZL
Output
Waveform 1
S1 at Vz
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
tPZH
Vm
tPLZ
Vm
tPHZ
Vm
Vi
Vm
0V
0.5 × Vz
VOL + 0.3 V _VOL
VOH − 0.3 V ^VOH
[0V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
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 1. Load Circuit and Voltage Waveforms
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
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