CY74FCT2374T
8-BIT REGISTER
WITH 3-STATE OUTPUTS
SCCS040A – SEPTEMBER 1994 – REVISED OCTOBER 2001
PARAMETER MEASUREMENT INFORMATION
7 V
Open
GND
S1
500 Ω
From Output
Under Test
From Output
Under Test
Test
Point
TEST
S1
t
/t
Open
7 V
PLH PHL
t /t
C
= 50 pF
C
= 50 pF
L
L
500 Ω
500 Ω
PLZ PZL
/t
(see Note A)
(see Note A)
t
Open
PHZ PZH
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR
3-STATE OUTPUTS
3 V
0 V
1.5 V
Timing Input
Data Input
t
w
t
h
t
3 V
su
3 V
0 V
1.5 V
Input
1.5 V
1.5 V
1.5 V
0 V
VOLTAGE WAVEFORMS
PULSE DURATION
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
3 V
0 V
3 V
0 V
Output
Control
1.5 V
1.5 V
1.5 V
1.5 V
Input
t
t
t
t
t
t
PLH
PHL
PLH
PZL
PZH
PLZ
≈3.5 V
V
Output
Waveform 1
(see Note B)
OH
In-Phase
Output
1.5 V
1.5 V
1.5 V
1.5 V
V
V
+ 0.3 V
OL
V
OL
V
OL
t
t
PHL
PHZ
V
V
V
OH
OH
Output
Waveform 2
(see Note B)
Out-of-Phase
Output
– 0.3 V
OH
1.5 V
1.5 V
≈0 V
OL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
NOTES: A. includes probe and jig capacitance.
C
L
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 ]
