参数资料
型号: SN74HC373DB
厂商: Texas Instruments, Inc.
英文描述: OCTAL TRANSPARENT D-TYPE LATCHES WITH 3-STATE OUTPUTS
中文描述: 有三态输出的8个透明D型锁存器
文件页数: 6/7页
文件大小: 107K
代理商: SN74HC373DB
SN54HC373, SN74HC373
OCTAL TRANSPARENT D-TYPE LATCHES
WITH 3-STATE OUTPUTS
SCLS140B – DECEMBER 1982 – REVISED MAY 1997
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
VOLTAGE WAVEFORMS
SETUP AND HOLD AND INPUT RISE AND FALL TIMES
VOLTAGE WAVEFORMS
PULSE DURATIONS
th
tsu
50%
50%
10%
50%
10%
90%
90%
VCC
VCC
0 V
0 V
tr
tf
Reference
Input
Data
Input
50%
High-Level
Pulse
50%
VCC
0 V
50%
50%
VCC
0 V
tw
Low-Level
Pulse
VOLTAGE WAVEFORMS
PROPAGATION DELAY AND OUTPUT TRANSITION TIMES
50%
50%
10%
50%
10%
90%
90%
VCC
VOH
VOL
0 V
tr
tf
Input
In-Phase
Output
50%
tPLH
tPHL
50%
10%
50%
10%
90%
90%
VOH
VOL
tr
tf
tPHL
tPLH
Out-of-
Phase
Output
50%
10%
90%
VCC
VCC
VOL
0 V
Output
Control
(Low-Level
Enabling)
Output
Waveform 1
(See Note B)
50%
tPZL
tPLZ
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES FOR 3-STATE OUTPUTS
VOH
0 V
50%
50%
tPZH
tPHZ
Output
Waveform 2
(See Note B)
VCC
Test
Point
From Output
Under Test
RL
VCC
S1
S2
LOAD CIRCUIT
PARAMETER
CL
tPZH
tpd or tt
tdis
ten
tPZL
tPHZ
tPLZ
1 k
1 k
50 pF
or
150 pF
50 pF
Open
Closed
RL
S1
Closed
Open
S2
Open
Closed
Closed
Open
50 pF
or
150 pF
Open
Open
––
NOTES: A. CL includes probe and test-fixture 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. Phase relationships between waveforms were chosen arbitrarily. All input pulses are supplied by generators having the following
characteristics: PRR
1 MHz, ZO = 50
, tr = 6 ns, tf = 6 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. tPLH and tPHL are the same as tpd.
CL
(see Note A)
Figure 1. Load Circuit and Voltage Waveforms
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