74LVC245ATTR [NXP]
LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER (NOT INVERTED) HIGH PERFORMANCE; 低压CMOS八路总线收发器（不倒）高性能
| 型号： | 74LVC245ATTR |
| 厂家： | 
NXP |
| 描述： | LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER (NOT INVERTED) HIGH PERFORMANCE |
| 文件： | 总12页 (文件大小：307K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74LVC245A
LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER
(NOT INVERTED) HIGH PERFORMANCE
■
■
■
5V TOLERANT INPUTS
HIGH SPEED: t = 6.3ns (MAX.) at V = 3V
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
PD
CC
■
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 24mA (MIN) at V = 3V
PCI BUS LEVELS GUARANTEED AT 24 mA
BALANCED PROPAGATION DELAYS:
OH
OL
CC
SOP
TSSOP
■
■
t
t
PLH
PHL
Table 1: Order Codes
PACKAGE
■
OPERATING VOLTAGE RANGE:
(OPR) = 1.65V to 3.6V (1.2V Data
V
T & R
CC
Retention)
SOP
74LVC245AMTR
74LVC245ATTR
■
■
■
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
TSSOP
LATCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
direction of data transmission is determined by
DIR input. The enable input G can be used to
disable the device so that the buses are effectively
isolated.
It has more speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
All inputs are equipped with protection circuits
against static discharge, giving them 2KV ESD
immunity and transient excess voltage.
All floating bus terminals during High Z State must
be held HIGH or LOW.
DESCRIPTION
The 74LVC245A is a low voltage CMOS OCTAL
BUS TRANSCEIVER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
2
wiring C MOS technology. It is ideal for 1.65 to 3.6
V
operations and low power and low noise
CC
applications.
This IC is intended for two-way asynchronous
communication between data buses and the
Figure 1: Pin Connection And IEC Logic Symbols
Rev. 4
1/12
July 2004
.
74LVC245A
Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
Table 3: Truth Table
INPUTS
PIN N°
SYMBOL
NAME AND FUNCTION
FUNCTION
A BUS B BUS
OUTPUT INPUT
OUTPUT
Yn
1
DIR
Directional Control
Data Inputs/Outputs
G
DIR
2, 3, 4, 5, 6,
7, 8, 9
A1 to A8
L
L
L
H
X
A = B
B = A
Z
INPUT
Z
OUTPUT
Z
18, 17, 16,
15, 14, 13,
12, 11
B1 to B8
Data Inputs/Outputs
H
X : Don’t Care
Z : High Impedance
19
10
20
G
Output Enable Input
Ground (0V)
GND
V
Positive Supply Voltage
CC
Table 4: Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +7.0
V
V
CC
V
DC Input Voltage
I
V
DC Output Voltage (High Impedance or V = 0V)
V
O
CC
V
DC Output Voltage (High or Low State) (note 1)
DC Input Diode Current
-0.5 to V + 0.5
V
O
CC
I
- 50
- 50
mA
mA
mA
mA
°C
°C
IK
I
DC Output Diode Current (note 2)
DC Output Current
OK
I
± 50
O
I
or I
DC V or Ground Current per Supply Pin
± 100
-65 to +150
300
CC
GND
CC
T
Storage Temperature
stg
T
Lead Temperature (10 sec)
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
1) I absolute maximum rating must be observed
O
2) V < GND
O
2/12
74LVC245A
Table 5: Recommended Operating Conditions
Symbol
Parameter
Value
Unit
V
Supply Voltage (note 1)
Input Voltage
1.65 to 3.6
0 to 5.5
V
V
CC
V
I
V
Output Voltage (High Impedance or V = 0V)
0 to 5.5
V
O
CC
V
Output Voltage (High or Low State)
0 to V
V
O
CC
I
I
I
I
, I
High or Low Level Output Current (V = 3.0 to 3.6V)
± 24
± 12
mA
mA
mA
mA
°C
OH OL
CC
, I
High or Low Level Output Current (V = 2.7 to 3.0V)
OH OL
CC
, I
High or Low Level Output Current (V = 2.3 to 2.7V)
± 8
OH OL
CC
, I
High or Low Level Output Current (V = 1.65 to 2.3V)
± 4
OH OL
CC
T
Operating Temperature
-55 to 125
0 to 10
op
dt/dv
Input Rise and Fall Time (note 2)
ns/V
1) Truth Table guaranteed: 1.2V to 3.6V
2) V from 0.8V to 2V at V = 3.0V
IN
CC
Table 6: DC Specifications
Test Condition
Value
Symbol
Parameter
-40 to 85 °C
-55 to 125 °C
Unit
V
CC
(V)
Min.
Max.
Min.
Max.
V
High Level Input
Voltage
0.65V
0.65V
CC
1.65 to 1.95
2.3 to 2.7
2.7 to 3.6
1.65 to 1.95
2.3 to 2.7
2.7 to 3.6
1.65 to 3.6
IH
CC
V
V
1.7
2
1.7
2
V
Low Level Input
Voltage
0.35V
0.35V
CC
IL
CC
0.7
0.8
0.7
0.8
V
High Level Output
Voltage
I =-100 µA
V
-0.2
V
-0.2
OH
O
CC
CC
I =-4 mA
1.65
2.3
1.2
1.2
1.7
2.2
2.4
2.2
O
I =-8 mA
1.7
2.2
2.4
2.2
O
V
I =-12 mA
2.7
O
I =-18 mA
3.0
O
I =-24 mA
3.0
O
V
Low Level Output
Voltage
I =100 µA
1.65 to 3.6
1.65
2.3
0.2
0.45
0.7
0.2
0.45
0.7
OL
O
I =4 mA
O
I =8 mA
V
O
I =12 mA
2.7
0.4
0.4
O
I =24 mA
3.0
0.55
± 5
0.55
± 5
O
I
Input Leakage Current
V = 0 to 5.5V
3.6
µA
µA
µA
I
I
I
Power Off Leakage
Current
off
V or V = 5.5V
0
10
10
I
O
I
High Impedance
Output Leakage
Current
3.6
V = V orV
± 10
± 10
OZ
I
IH
IL
V
= 0 to 5.5V
O
I
Quiescent Supply
Current
V = V or GND
I CC
10
10
CC
3.6
µA
µA
V or V = 3.6 to
I
O
± 10
500
± 10
500
5.5V
∆I
I
incr. per Input
V
= V -0.6V
2.7 to 3.6
CC
CC
IH
CC
3/12
74LVC245A
Table 7: Dynamic Switching Characteristics
Test Condition
Value
T = 25 °C
Symbol
Parameter
Unit
A
V
CC
(V)
Min.
Typ.
Max.
V
Dynamic Low Level Quiet
Output (note 1)
0.8
C = 50pF
OLP
L
3.3
V
V
= 0V, V = 3.3V
V
-0.8
IL
IH
OLV
1) Number of output defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is
measured in the LOW state.
Table 8: AC Electrical Characteristics
Test Condition
Value
-55 to 125 °C
Symbol
Parameter
-40 to 85 °C
Unit
ns
V
(V)
C
R
t = t
CC
L
L
s
r
(pF)
(Ω)
(ns)
Min.
Max.
Min.
Max.
t
t
Propagation Delay
Time
1.65 to 1.95
2.3 to 2.7
2.7
30
30
50
50
30
30
50
50
30
30
50
50
1000
500
500
500
1000
500
500
500
1000
500
500
500
2.0
2.0
2.5
2.5
2.0
2.0
2.5
2.5
2.0
2.0
2.5
2.5
2.0
2.0
1.5
1.0
2.0
2.0
1.0
1.0
2.0
2.0
2.0
2.0
9.0
8.0
7.3
6.3
12
2.0
2.0
1.5
1.0
2.0
2.0
1.0
1.0
2.0
2.0
2.0
2.0
12
10.5
8.8
7.6
16
PLH PHL
3.0 to 3.6
t
t
t
Output Enable Time 1.65 to 1.95
PZL PZH
2.3 to 2.7
9.5
9.0
8.5
11
12.5
11
ns
2.7
3.0 to 3.6
10
t
Output Disable Time 1.65 to 1.95
14
PLZ PHZ
2.3 to 2.7
2.7
9.0
8.5
7.5
1
12
ns
ns
10
3.0 to 3.6
9.0
1
t
t
Output To Output
Skew Time (note1,
2)
2.7 to 3.6
OSLH
OSHL
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW (t
2) Parameter guaranteed by design
= | t
- t
|, t
= | t
- t
|
OSLH
PLHm PLHn OSHL
PHLm PHLn
Table 9: Capacitive Characteristics
Test Condition
Value
T = 25 °C
Symbol
Parameter
Unit
A
V
CC
(V)
Min.
Typ.
Max.
C
Input Capacitance
4
pF
pF
IN
C
Power Dissipation Capacitance
(note 1)
1.8
2.5
3.3
f
= 10MHz
IN
28
30
34
PD
1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
PD
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
= C x V x f + I /n (per circuit)
CC(opr)
PD CC IN CC
4/12
74LVC245A
Figure 3: Test Circuit
R
= Z
of pulse generator (typically 50Ω)
OUT
T
Table 10: Test Circuit And Waveform Symbol Value
V
CC
Symbol
1.65 to 1.95V
30pF
2.3 to 2.7V
30pF
2.7V
50pF
500Ω
6V
3.0 to 3.6V
50pF
500Ω
6V
C
L
R = R
1000Ω
500Ω
L
1
V
2 x V
2 x V
CC
S
CC
V
V
V
CC
2.7V
1.5V
3.0V
2.7V
IH
CC
V
V
/2
V /2
CC
1.5V
M
CC
V
V
V
CC
3.0V
OH
CC
V
V
+ 0.15V
- 0.15V
V
+ 0.15V
- 0.15V
V
+ 0.3V
V
V
+ 0.3V
- 0.3V
X
Y
OL
OL
OL
OL
OH
V
V
V
V
- 0.3V
OH
OH
OH
t = t
<2.0ns
<2.0ns
<2.5ns
<2.5ns
r
r
Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
5/12
74LVC245A
Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
6/12
74LVC245A
SO-20 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
MIN.
MAX.
A
A1
B
2.35
2.65
0.093
0.104
0.1
0.33
0.23
12.60
7.4
0.30
0.51
0.32
13.00
7.6
0.004
0.013
0.009
0.496
0.291
0.012
0.020
0.013
0.512
0.299
C
D
E
e
1.27
0.050
H
10.00
0.25
0.4
10.65
0.75
1.27
8°
0.394
0.010
0.016
0°
0.419
0.030
0.050
8°
h
L
k
0°
ddd
0.100
0.004
0016022D
7/12
74LVC245A
TSSOP20 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.2
MIN.
MAX.
0.047
0.006
0.041
0.012
0.0079
0.260
0.260
0.176
A
A1
A2
b
0.05
0.8
0.15
1.05
0.30
0.20
6.6
0.002
0.031
0.007
0.004
0.252
0.244
0.169
0.004
0.039
1
0.19
0.09
6.4
c
D
6.5
6.4
0.256
0.252
E
6.2
6.6
E1
e
4.3
4.4
4.48
0.173
0.65 BSC
0.0256 BSC
K
0˚
8˚
0˚
8˚
L
0.45
0.60
0.75
0.018
0.024
0.030
A2
A
K
L
b
e
A1
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
8/12
74LVC245A
Tape & Reel SO-20 MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
330
MIN.
MAX.
12.992
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
30.4
11
1.197
0.433
0.528
0.130
0.161
0.476
Ao
Bo
Ko
Po
P
10.8
13.2
3.1
0.425
0.520
0.122
0.153
0.468
13.4
3.3
3.9
4.1
11.9
12.1
9/12
74LVC245A
Tape & Reel TSSOP20 MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
330
MIN.
MAX.
12.992
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
22.4
7
0.882
0.276
0.280
0.075
0.161
0.476
Ao
Bo
Ko
Po
P
6.8
6.9
0.268
0.272
0.067
0.153
0.468
7.1
1.9
4.1
12.1
1.7
3.9
11.9
10/12
74LVC245A
Table 11: Revision History
Date
Revision
Description of Changes
Ordering Codes Revision - pag. 1.
26-Jul-2004
4
11/12
74LVC245A
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
All other names are the property of their respective owners
© 2004 STMicroelectronics - All Rights Reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com
12/12
相关型号：
©2020 ICPDF网 联系我们和版权申明