SN54AHC541, SN74AHC541
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCLS261M – DECEMBER 1995 – REVISED JULY 2003
PARAMETER MEASUREMENT INFORMATION
RL = 1 kΩ
S1
VCC
Open
GND
From Output
Under Test
CL
(see Note A)
Test
Point
From Output
Under Test
CL
(see Note A)
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open Drain
S1
Open
VCC
GND
VCC
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR
3-STATE AND OPEN-DRAIN OUTPUTS
VCC
Timing Input
tw
VCC
tsu
Data Input
0V
50% VCC
50% VCC
th
0V
VCC
50% VCC
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VCC
VCC
50% VCC
tPZL
50% VCC
tPZH
Output
Waveform 2
S1 at GND
(see Note B)
50% VCC
50% VCC
0V
tPLZ
≈V
CC
VOL + 0.3 V
tPHZ
VOH – 0.3 V
VOH
≈0
V
VOL
Input
50% VCC
50% VCC
VOLTAGE WAVEFORMS
PULSE DURATION
Input
tPLH
In-Phase
Output
tPHL
Out-of-Phase
Output
50% VCC
50% VCC
0V
tPHL
Output
Control
50% VCC
VOH
50% VCC
VOL
tPLH
Output
Waveform 1
S1 at VCC
(see Note B)
50% VCC
VOH
50% VCC
VOL
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
≤
1 MHz, ZO = 50
Ω,
tr
≤
3 ns, tf
≤
3 ns.
D. The outputs are measured one at a time with one input transition per measurement.
E. All parameters and waveforms are not applicable to all devices.
Figure 1. Load Circuit and Voltage Waveforms
6
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
