Datasheet

SN74ABT18502
SCAN TEST DEVICE
WITH 18-BIT REGISTERED BUS TRANSCEIVER
SCBS753 – FEBRUARY 2002
27
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
LOAD CIRCUIT FOR OUTPUTS
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
(see Note A)
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NON-INVERTING 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
(see Note B)
1.5 V
Output
Control
Output
Waveform 1
S1 at 7 V
(see Note C)
Output
Waveform 2
S1 at Open
(see Note C)
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. 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.
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.
Figure 13. Load Circuit and Voltage Waveforms