Datasheet

SN54BCT541, SN74BCT541A
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS
SCBS011E – JULY 1988 – REVISED MARCH 2003
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
NOTES: A. C
L
includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, t
r
= t
f
≤ 2.5 ns, duty cycle = 50%.
C. 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.
D. The outputs are measured one at a time with one transition per measurement.
E. When measuring propagation delay times of 3-state outputs, switch S1 is open.
F. All parameters and waveforms are not applicable to all devices.
From Output
Under Test
Test
Point
R1
C
L
(see Note A)
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR
3-STATE AND OPEN-COLLECTOR OUTPUTS
R1
S1
7 V (t
PZL
, t
PLZ
, O.C.)
Open
(all others)
From Output
Under Test
Test
Point
R2
C
L
(see Note A)
R
L
= R1 = R2
1.5 V
1.5 V
1.5 V
3 V
3 V
0 V
0 V
t
h
t
su
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing Input
(see Note B)
Data Input
(see Note B)
1.5 V
1.5 V
3 V
3 V
0 V
0 V
High-Level
Pulse
(see Note B)
Low-Level
Pulse
t
w
VOLTAGE WAVEFORMS
PULSE DURATION
1.5 V
1.5 V
t
PHL
t
PLH
t
PLH
t
PHL
Input
(see Note B)
Out-of-Phase
Output
(see Note D)
1.5 V 1.5 V
1.5 V1.5 V
1.5 V 1.5 V
3 V
0 V
V
OL
V
OH
V
OH
V
OL
In-Phase
Output
(see Note D)
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES (see Note D)
t
PHZ
t
PLZ
0.3 V
t
PZL
t
PZH
1.5 V1.5 V
1.5 V
1.5 V
3 V
0 V
Output
Control
(low-level enable)
Waveform 1
(see Notes C and D)
Waveform 2
(see Notes C and D)
0 V
V
OH
V
OL
3.5 V
0.3 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
Figure 1. Load Circuit and Voltage Waveforms