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参数资料
型号： SN74LV245ATGVR
厂商： Texas Instruments, Inc.
英文描述： OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
中文描述： 八路总线收发器具有三态输出
文件页数： 6/19页
文件大小： 464K
代理商： SN74LV245ATGVR
www.ti.com
50% V
CC
3 V
3 V
0 V
0 V
t
h
t
su
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Data Input
t
PLH
t
PHL
t
PHL
t
PLH
V
OH
V
OH
V
OL
V
OL
3 V
0 V
50% V
CC
50% V
CC
Input
Out-of-Phase
Output
In-Phase
Output
Timing Input
50% V
CC
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
INVERTING AND NONINVERTING OUTPUTS
Output
Control
Output
Waveform 1
S1 at V
CC
(see Note B)
Output
Waveform 2
S1 at GND
(see Note B)
V
OL
V
OH
t
PZL
t
PZH
t
PLZ
t
PHZ
≈
V
CC
0 V
50% V
CC
V
OL
+ 0.3 V
50% V
CC
≈
0 V
3 V
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES
LOW- AND HIGH-LEVEL ENABLING
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
Open Drain
Open
V
CC
GND
V
CC
TEST
S1
3 V
0 V
t
w
VOLTAGE WAVEFORMS
PULSE DURATION
Input
From Output
Under Test
C
L
(see Note A)
LOAD CIRCUIT FOR
3-STATE AND OPEN-DRAIN OUTPUTS
S1
V
CC
R
L
= 1 k
GND
From Output
Under Test
C
L
(see Note A)
Test
Point
LOAD CIRCUIT FOR
TOTEM-POLE OUTPUTS
Open
V
OH
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
1.5 V
NOTES: A. C
L
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, Z
O
= 50
, t
r
≤
3 ns, t
f
≤
3 ns.
D. The outputs are measured one at a time, with one input transition per measurement.
E. t
PLZ
and t
PHZ
are the same as t
dis
.
F. t
PZL
and t
PZH
are the same as t
en
.
G. t
PHL
and t
PLH
are the same as t
pd
.
H. All parameters and waveforms are not applicable to all devices.
SN74LV245AT
OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCLS605B–DECEMBER 2004–REVISED AUGUST 2005
PARAMETER MEASUREMENT INFORMATION
Figure 1. Load Circuits and Voltage Waveforms
6
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