CY74FCT2374T
8-BIT REGISTER
WITH 3-STATE OUTPUTS
SCCS040A – SEPTEMBER 1994 – REVISED OCTOBER 2001
PARAMETER MEASUREMENT INFORMATION
7V
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
Open
GND
500
Ω
TEST
tPLH/tPHL
tPLZ/tPZL
tPHZ/tPZH
S1
Open
7V
Open
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR
3-STATE OUTPUTS
3V
Timing Input
tw
3V
tsu
Data Input
0V
1.5 V
1.5 V
0V
th
3V
1.5 V
0V
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
3V
3V
1.5 V
1.5 V
0V
tPZL
VOH
1.5 V
1.5 V
VOL
tPLH
VOH
1.5 V
1.5 V
VOL
Output
Waveform 2
(see Note B)
Output
Waveform 1
(see Note B)
tPZH
1.5 V
1.5 V
tPLZ
≈3.5
V
VOL + 0.3 V
tPHZ
VOH – 0.3 V
VOH
≈0
V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
VOL
Input
1.5 V
1.5 V
VOLTAGE WAVEFORMS
PULSE DURATION
Input
tPLH
In-Phase
Output
tPHL
Out-of-Phase
Output
1.5 V
1.5 V
0V
tPHL
Output
Control
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
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. The outputs are measured one at a time with one input transition per measurement.
Figure 1. Load Circuit and Voltage Waveforms
6
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
CONEXANT [ CONEXANT SYSTEMS, INC ]
