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74AC11646_09 Datasheet, PDF (8/9 Pages) Texas Instruments – OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
74AC11646
OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3ĆSTATE OUTPUTS
SCAS079A − JULY 1987 − REVISED APRIL 1993
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL = 50 pF
(see Note A)
500 Ω
500 Ω
2 × VCC
S1
Open
GND
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
S1
Open
2 × VCC
GND
LOAD CIRCUIT
Input
tw
50%
50%
VOLTAGE WAVEFORMS
VCC
0V
Timing Input
(see Note B)
tsu
Data Input
50%
th
50%
50%
VOLTAGE WAVEFORMS
VCC
0V
VCC
0V
Input
(see Note B)
50%
50%
VCC
0V
tPLH
In-Phase
Output
tPHL
Out-of-Phase
Output
50% VCC
50% VCC
tPHL
VOH
50% VCC
VOL
tPLH
VOH
50% VCC
VOL
VOLTAGE WAVEFORMS
Output
Control
(low-level
enabling)
tPZL
Output
Waveform 1
S1 at 2 × VCC
(see Note C)
Output
Waveform 2
S1 at GND
(see Note C)
tPZH
50%
50%
tPLZ
50% VCC
tPHZ
20% VCC
50% VCC
80% VCC
VOLTAGE WAVEFORMS
VCC
0V
[ VCC
VOL
VOH
[0V
NOTES: A. CL includes probe and jig capacitance.
B. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10 MHz, ZO = 50 Ω, tr = 3 ns, tf = 3 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 input transition per measurement.
Figure 2. Load Circuit and Voltage Waveforms
2−8
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