Datasheet

SN54ABT8543, SN74ABT8543
SCAN TEST DEVICES WITH
OCTAL REGISTERED BUS TRANSCEIVERS
SCBS120E – AUGUST 1991 – REVISED JULY 1996
24
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
1.5 V
t
h
t
su
From Output
Under Test
C
L
= 50 pF
(see Note A)
LOAD CIRCUIT
S1
7 V
Open
GND
500 Ω
500 Ω
Data Input
Timing Input
1.5 V
3 V
0 V
1.5 V 1.5 V
3 V
0 V
3 V
0 V
1.5 V 1.5 V
t
w
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VOLTAGE WAVEFORMS
PULSE DURATION
t
PLH
t
PHL
t
PHL
t
PLH
V
OH
V
OH
V
OL
V
OL
1.5 V 1.5 V
3 V
0 V
1.5 V1.5 V
Input
1.5 V
Output
Control
Output
Waveform 1
S1 at 7 V
(see Note B)
Output
Waveform 2
S1 at Open
(see Note B)
V
OL
V
OH
t
PZL
t
PZH
t
PLZ
t
PHZ
1.5 V
1.5 V
3.5 V
0 V
1.5 V
V
OL
+ 0.3 V
1.5 V
V
OH
– 0.3 V
0 V
3 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
Output
Output
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
Open
7 V
Open
TEST S1
NOTES: A. C
L
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, Z
O
= 50 Ω, t
r
≤ 2.5 ns, t
f
≤ 2.5 ns.
D. The outputs are measured one at a time with one transition per measurement.
Figure 13. Load Circuit and Voltage Waveforms