Datasheet

SN74GTL1655
16-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVER
WITH LIVE INSERTION
SCBS696G – JULY 1997 – REVISED AUGUST 2001
2–14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
t
h
t
su
From Output
Under Test
C
L
= 50 pF
(see Note A)
LOAD CIRCUIT FOR A OUTPUTS
S1
6 V
Open
GND
500 Ω
500 Ω
TEST
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
Open
6 V
GND
t
PLH
t
PHL
Output
Control
Output
Waveform 1
S1 at 6 V
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
V
OL
V
OH
t
PZL
t
PZH
t
PLZ
t
PHZ
3 V
0 V
V
REF
V
REF
V
TT
V
OL
0 V
V
OL
+ 0.3 V
V
OH
– 0.3 V
≈0 V
3 V
0 V
0 V
3 V
0 V
t
w
Input
3 V
3 V
3 V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(CLK to B port)
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
(A port)
Timing
Input
Data Input
A Port
Output
Input
V
TT
Test
Point
C
L
= 30 pF
(see Note A)
From Output
Under Test
12.5 Ω
LOAD CIRCUIT FOR B OUTPUTS
t
PLH
t
PHL
0 V
V
OH
V
OL
Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
(CLK to A port)
Output
V
REF
V
REF
0 V
V
TT
Data Input
B Port
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.
E. t
PLZ
and t
PHZ
are the same as t
dis
.
F. t
PZL
and t
PZH
are the same as t
en
.
1.5 V
1.5 V
1.5 V 1.5 V
1.5 V 1.5 V
1.5 V
1.5 V
1.5 V
1.5 V 1.5 V
1.5 V
1.5 V
1.5 V 1.5 V
3 V
Figure 1. Load Circuits and Voltage Waveforms