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CD74FCT646 Datasheet(PDF) 7 Page - Texas Instruments

No. de pieza CD74FCT646
Descripción Electrónicos  BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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CD74FCT646 Datasheet(HTML) 7 Page - Texas Instruments

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CD74FCT646
BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
SCBS735A – JULY 2000 – REVISED JULY 2000
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
3 V
3 V
0 V
0 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Data Input
tPLH
tPHL
tPHL
tPLH
VOH
VOH
VOL
VOL
3 V
0 V
1.5 V
1.5 V
Input
Out-of-Phase
Output
In-Phase
Output
Timing Input
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
Output
Control
Output
Waveform 1
(see Note B)
Output
Waveform 2
(see Note B)
VOL
VOH
tPZL
tPZH
tPLZ
tPHZ
≈3.5 V
0 V
1.5 V
VOL + 0.3 V
1.5 V
≈0 V
3 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open Drain
Open
7 V
Open
7 V
TEST
S1
3 V
0 V
1.5 V
tw
VOLTAGE WAVEFORMS
PULSE DURATION
Input
NOTES: A. CL 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, ZO = 50 Ω, tr and tf = 2.5 ns.
D. The outputs are measured one at a time with one input transition per measurement.
E. tPLZ and tPHZ are the same as tdis.
F. tPZL and tPZH are the same as ten.
G. tPHL and tPLH are the same as tpd.
From Output
Under Test
CL = 50 pF
(see Note A)
LOAD CIRCUIT FOR
3-STATE AND OPEN-DRAIN OUTPUTS
S1
7 V
500
GND
From Output
Under Test
CL = 50 pF
(see Note A)
Test
Point
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
Open
VOH – 0.3 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
500
500
1.5 V
1.5 V
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
1.5 V
1.5 V
10%
10%
90%
90%
3 V
0 V
tr
tf
Figure 2. Load Circuit and Voltage Waveforms


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