參數(shù)資料
型號： 74LVC245
廠商： Texas Instruments, Inc.
英文描述： OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS
中文描述： 八路總線收發(fā)器具有三態(tài)輸出
文件頁數(shù)： 6/10頁
文件大?。?/td> 97K
代理商： 74LVC245
Philips Semiconductors
Product specification
74LVC245A
74LVCH245A
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
1998 May 20
6
AC CHARACTERISTICS
GND = 0V; t
r
= t
f
2.5ns; C
L
= 50pF; R
L
= 500
; T
amb
= –40
°
C to +85
°
C.
LIMITS
SYMBOL
PARAMETER
WAVEFORM
V
CC
= 3.3V
±
0.3V
MIN
TYP
1
V
CC
= 2.7V
MIN
V
CC
= 1.2V
TYP
UNIT
MAX
MAX
t
PHL
t
PLH
Propagation delay
A
n
to B
n
;
B
n
to A
n
3-State output enable time
OE to A
n
;
OE to B
n
3-State output disable time
OE to A
n
;
OE to B
n
1, 3
1.5
3.6
6.3
1.5
7.3
16
ns
t
PZH
t
PZL
2, 3
1.5
5.1
8.5
1.5
9.5
23
ns
t
PHZ
t
PLZ
2, 3
1.5
4.5
7.0
1.5
8.0
16
ns
NOTE:
1. Unless otherwise stated, all typical values are at V
CC
= 3.3V and T
amb
= 25
°
C.
AC WAVEFORMS
V
M
= 1.5V at V
V
and V
OH
are the typical output voltage drop that occur with the
output load.
V
X
= V
OL
+ 0.3V at V
CC
2.7V; V
X
= V
OL
+ 0.1 V
CC
at V
CC
V
Y
= V
OH
–0.3V at V
CC
2.7V; V
Y
= V
OH
– 0.1 V
CC
at V
CC
2.7V; V
= 0.5 V
at V
2.7V.
2.7V
2.7V
SY00041
INPUT
V
M
t
PHL
t
PLH
V
OL
V
I
V
M
GND
V
OH
OUTPUT
Waveform 1. Input (D
n
) to output (Qn) propagation delays.
t
PLZ
t
PZL
V
I
nOE INPUT
GND
V
CC
Q
OUTPUT
LOW-to-OFF
OFF-to-LOW
V
OL
V
OH
Q
OUTPUT
HIGH-to-OFF
OFF-to-HIGH
GND
outputs
enabled
outputs
enabled
outputs
disabled
t
PHZ
V
M
V
M
V
M
t
PZH
V
X
V
Y
SW00207
Waveform 2. 3-State enable and disable times.
TEST CIRCUIT
PULSE
GENERATOR
R
T
V
IN
D.U.T.
V
OUT
C
L
V
CC
R
L
=500
SWITCH POSITION
TEST
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
SWITCH
Open
2
V
CC
GND
Test Circuit for 3-State Outputs
Open
GND
S
1
2
V
CC
DEFINITIONS
R
L
= Load resistor
C
L
= Load capacitance includes jig and probe capacitance
R
T
=Termination resistance should be equal to Z
OUT
of pulse generators.
V
CC
2.7V
2.7 – 3.6V
V
IN
V
CC
2.7V
SW00047
R
L
=500
Waveform 3. Load circuitry for switching times.
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