Datasheet

74AC11240
OCTAL BUFFER/LINE DRIVER
WITH 3-STATE OUTPUTS
SCAS448A – MAY 1987 – REVISED APRIL 1996
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
C
L
= 50 pF
(see Note A)
LOAD CIRCUIT
S1
2 × V
CC
500 Ω
500 Ω
t
PHL
t
PLH
Output
Control
(low-level
enabling)
Output
Waveform 1
S1 at 2 × V
CC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
V
OL
V
OH
t
PZL
t
PZH
t
PLZ
t
PHZ
V
C
C
V
CC
0 V
50% V
CC
50% V
CC
V
OH
V
OL
0 V
50% V
CC
20% V
CC
50% V
CC
80% V
CC
0 V
V
CC
GND
Open
Input
Output
VOLTAGE WAVEFORMS VOLTAGE WAVEFORMS
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
Open
2 × V
CC
GND
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 ≤ 1 MHz, Z
O
= 50 Ω, t
r
= 3 ns, t
f
= 3 ns.
D. The outputs are measured one at a time with one input transition per measurement.
50% V
CC
50% V
CC
50% V
CC
50% V
CC
Figure 1. Load Circuit and Voltage Waveforms