CD74FCT2952A Datasheet, PDF (6/9 Pages) Texas Instruments – BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS

CD74FCT2952A
BiCMOS OCTAL BUS TRANSCEIVER AND REGISTER
WITH 3-STATE OUTPUTS
SCBS720 – JULY 2000
PARAMETER MEASUREMENT INFORMATION
From Output
Under Test
CL = 50 pF
(see Note A)
Test
Point
500 Ω
From Output
Under Test
CL = 50 pF
(see Note A)
500 Ω ^S1
500 Ω
7V
Open
GND
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR
3-STATE AND OPEN-DRAIN OUTPUTS
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
Open Drain
S1
Open
7V
Open
7V
1.5 V
10%
90%
tr
90%
3V
1.5 V
10% _{0 V}
tf
VOLTAGE WAVEFORM
INPUT RISE AND FALL TIMES
Input
tw
3V
1.5 V
1.5 V
0V
VOLTAGE WAVEFORMS
PULSE DURATION
3V
Timing Input
1.5 V
0V
th
tsu
3V
Data Input
1.5 V
1.5 V
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Input
1.5 V
3V
1.5 V
0V
tPLH
In-Phase
Output
1.5 V
tPHL
VOH
1.5 V
VOL
tPHL
tPLH
Out-of-Phase
Output
1.5 V
1.5 V
VOH
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
Output
Control
1.5 V
3V
1.5 V
0V
tPZL
Output
Waveform 1
(see Note B)
tPZH
Output
Waveform 2
(see Note B)
1.5 V
1.5 V
tPLZ
≈3.5 V
VOL + 0.3 V _VOL
tPHZ
VOH – 0.3 VVOH
≈0 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
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.
Figure 1. Load Circuit and Voltage Waveforms
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