HEX BUFFERS/DRIVERS
WITH OPEN-DRAIN OUTPUTS
SCAS595P – OCTOBER 1997 – REVISED JANUARY 2007
www.ti.com
PARAMETER MEASUREMENT INFORMATION
V
CC
= 2.5 V
±
0.2 V
2
×
V
CC
From Output
Under Test
C
L
= 30 pF
(see Note A)
500 Ω
S1
Open
GND
500 Ω
TEST
t
PZL
(see Note F)
t
PLZ
(see Note G)
t
PHZ
/t
PZH
S1
2 × V
CC
2 × V
CC
2 × V
CC
LOAD CIRCUIT
t
w
Timing
Input
t
su
Data
Input
V
CC
/2
V
CC
V
CC
/2
0V
t
h
V
CC
V
CC
/2
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Output
Control
(low-level
enabling)
t
PZL
V
CC
Input
V
CC
/2
V
CC
/2
0V
t
PLH
t
PHL
V
CC
Output
V
CC
/2
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
V
CC
/2
V
OL
Output
Waveform 2
S1 at 2 × V
CC
(see Note B)
Output
Waveform 1
S1 at 2 × V
CC
(see Note B)
t
PZH
V
CC
Input
V
CC
/2
VOLTAGE WAVEFORMS
PULSE DURATION
V
CC
/2
0V
V
CC
V
CC
/2
V
CC
/2
0V
t
PLZ
V
CC
V
CC
/2
V
OL
+ 0.15 V
V
OL
t
PHZ
V
CC
V
CC
− 0.15 V
0V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
V
CC
/2
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 ns, t
f
≤
2 ns.
D. The outputs are measured one at a time, with one transition per measurement.
E. Since this device has open-drain outputs, t
PLZ
and t
PZL
are the same as t
pd
.
F. t
PZL
is measured at V
CC
/2.
G. t
PLZ
is measured at V
OL
+ 0.15 V.
H. All parameters and waveforms are not applicable to all devices.
Figure 2. Load Circuit and Voltage Waveforms
6
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