74LVX4245TTR [STMICROELECTRONICS]
OCTAL DUAL SUPPLY BUS TRANSCEIVER; 八路双电源总线收发器
| 型号： | 74LVX4245TTR |
| 厂家： | 
ST |
| 描述： | OCTAL DUAL SUPPLY BUS TRANSCEIVER |
| 文件： | 总13页 (文件大小：310K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74LVX4245
OCTAL DUAL SUPPLY BUS TRANSCEIVER
■
HIGH SPEED:
= 8.5 ns (MAX.) at
t
PD
V
=5.0V V
= 3.3V
CCA
CCB
■
■
■
■
■
LOW POWER DISSIPATION:
= I =5µA(MAX.) at T =25°C
I
CCA
CCB
A
LOW NOISE: V
=0.3V (TYP.) at
OLP
V
=5.5V V
=3.3V
SOP
TSSOP
CCA
CCB
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 24mA (MIN)
OH
OL
Table 1: Order Codes
PACKAGE
BALANCED PROPAGATION DELAYS:
t
t
PLH
PHL
T & R
OPERATING VOLTAGE RANGE:
SOP
74LVX4245MTR
74LVX4245TTR
V
(OPR)=4.5Vto5.5V(1.2VDataRetention)
CCA
TSSOP
V
(OPR)=2.7Vto3.6V(1.2VDataRetention)
CCB
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 4245
IMPROVED LATCH-UP IMMUNITY
This IC is intended for two-way asynchronous
communication between data buses and the
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.
■
DESCRIPTION
The 74LVX4245 is a dual supply low voltage
CMOS OCTAL BUS TRANSCEIVER fabricated
with sub-micron silicon gate and double-layer
The A-port interfaces with the 5V bus, the B-port
with the 3.3V bus.
2
metal wiring C MOS technology. Designed for use
as an interface between a 5V bus and a 3.3V bus
in a mixed 5V/3.3V supply systems, it achieves
high speed operation while maintaining the CMOS
low power dissipation.
All inputs are equipped with protection circuits
against static discharge, giving them 2KV ESD
immunity and transient excess voltage.
Figure 1: Pin Connection And IEC Logic Symbols
Rev. 6
1/13
August 2004
74LVX4245
Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
PIN N°
SYMBOL
NAME QND FUNCTION
2
DIR
Directional Control
Data Inputs/Outputs
3, 4, 5, 6, 7,
8, 9, 10
A1 to A8
21, 20, 19,
18, 17, 16,
15, 14
B1 to B8
Data Inputs/Outputs
22
G
Output Enable Input
Ground (0V)
11, 12, 13
GND
NC
23
1
Not Connected
V
V
Positive Supply Voltage
CCA
24
Positive Supply Voltage
CCB
Table 3: Truth Table
INPUTS
FUNCTION
OUTPUT
G
DIR
A BUS
B BUS
L
L
L
H
X
OUTPUT
INPUT
Z
INPUT
OUTPUT
Z
A = B
B = A
Z
H
X : Don’t Care
Z : High Impedance
Table 4: Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7.0
-0.5 to +7.0
V
V
CCA
V
Supply Voltage
CCB
V
DC Input Voltage
DC I/O Voltage
-0.5 to V
+ 0.5
V
I
CCA
CCA
CCB
V
-0.5 to V
-0.5 to V
+ 0.5
+ 0.5
V
I/OA
V
DC I/O Voltage
V
I/OB
I
DC Input Diode Current
DC Output Diode Current
DC Output Current
DC Output Current
± 20
mA
mA
mA
mA
mA
mA
mW
°C
°C
IK
I
± 50
± 50
± 50
± 200
± 100
180
OK
I
OA
I
OB
I
DC V or Ground Current
CCA
CC
I
DC V or Ground Current
CCB
CC
P
Power Dissipation
d
T
Storage Temperature
Lead Temperature (10 sec)
-65 to +150
300
stg
T
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
2/13
74LVX4245
Table 5: Recommended Operating Conditions
Symbol
Parameter
Value
Unit
V
Supply Voltage (note 1)
Supply Voltage (note 1)
Input Voltage
4.5 to 5.5
2.7 to 3.6
V
V
CCA
V
CCB
V
0 to V
V
I
CCA
V
I/O Voltage
0 to V
V
I/OA
CCA
V
I/O Voltage
0 to V
V
I/OB
CCB
T
Operating Temperature
-55 to 125
0 to 10
°C
ns/V
op
dt/dv
Input Rise and Fall Time (note 2)
1) V from 30% to 70% of V
IN
CC
2) V
= 4.5 to 5.5V; V
= 2.7 to 3.6V;
CCA
CCB
Table 6: DC Specifications For V
CCA
Test Condition
Value
-40 to 85 °C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
T = 25 °C
Symbol
Parameter
A
V
V
CCB
(V)
CCA
(V)
V
High Level Input
Voltage
4.5
5.5
4.5
5.5
4.5
3.3
3.3
3.3
3.3
3.0
2.0
2.0
2.0
2.0
2.0
2.0
IHA
V
V
V
Low Level Input
Voltage
0.8
0.8
0.8
0.8
0.8
0.8
ILA
V
High Level
Output Voltage
I =-100 µA
4.4
4.5
0
4.4
4.4
OHA
O
V
V
I =-24 mA
4.5
4.5
4.5
3.0
3.0
3.0
3.86
3.76
3.76
O
V
Low Level Output
Voltage
I =100 µA
0.1
0.1
0.1
OLA
O
I =24 mA
0.36
0.44
0.44
O
I
Input Leakage
Current
IA
V = V or GND
5.5
5.5
3.6
3.6
± 0.1
± 0.5
± 1
± 5
± 1
± 5
µA
µA
I
CC
I
High Impedance
Output Leakage
Current
V
V
= V
or V
or V
OZA
IA
IHA
ILA
ILB
= V
IB
IHB
V
= V
or
I/OA
CCA
GND
= V or
CCA
I
Quiescent Supply 5.5
Current
3.6
3.6
V
V
5
50
50
µA
CCtA
IA
IB
GND
= V
or
CCB
GND
= V
∆I
Maximum
5.5
V
- 2.1V
CCA
1.35
1.5
1.5 mA
CCtA
IA
Quiescent Supply
Current / Input
(An, DIR, G)
V
= V
GND
or
CCB
IB
3/13
74LVX4245
Table 7: DC Specifications For V
CCB
Test Condition
Value
T = 25 °C
Symbol
Parameter
-40 to 85 °C -55 to 125°C Unit
A
V
V
CCB
CCA
(V)
(V)
Min. Typ. Max. Min. Max. Min. Max.
V
High Level Input
Voltage
5.0
5.0
5.0
5.0
4.5
3.6
2.7
3.6
2.7
3.0
2.0
2.0
2.0
2.0
2.0
2.0
IHB
V
V
V
Low Level Input
Voltage
0.8
0.8
0.8
0.8
0.8
0.8
ILB
V
High Level
Output Voltage
I =-100 µA
2.9
3.0
0.0
2.9
2.4
2.2
2.9
2.4
2.2
OHB
O
I =-12 mA
4.5
4.5
4.5
4.5
4.5
3.0
2.7
3.0
3.0
2.7
2.48
2.26
V
V
O
I =-8 mA
O
V
Low Level Output
Voltage
I =100 µA
0.1
0.1
0.1
OLB
O
I =12 mA
0.31
0.31
0.40
0.40
0.40
0.40
O
I =8 mA
O
I
Input Leakage
Current
IB
V = V
or GND
CCA
5.5
5.5
3.6
3.6
± 0.1
± 0.5
± 1
± 5
± 1
± 5
µA
µA
I
I
High Impedance
Output Leakage
Current
V
= V
or V
OZB
IA
IHA ILA
V
= V
or
I/Ob
CCb
GND
= V or
CCA
GND
= V
GND
= V
CCA
I
Quiescent Supply 5.5
Current
3.6
3.6
V
5
50
5
µA
CCtB
IA
IB
V
V
or
CCB
∆I
Maximum
5.5
or
0.35
0.5
0.35 mA
CCtB
IA
Quiescent Supply
Current / Input
GND
= V
V
- 0.6V
CCB
IB
Table 8: Dynamic Switching Characteristics
Test Condition
Value
T = 25 °C
Symbol
Parameter
-40 to 85 °C -55 to 125°C Unit
A
V
V
CCB
CCA
(V)
(V)
Min. Typ. Max. Min. Max. Min. Max.
V
V
Dynamic Low Level
Quiet Output (note 1,
2)
5.0
5.0
5.0
5.0
3.3
3.3
3.3
3.3
1.0
-0.6
0.8
1.5
1.2
OLPA
OLPB
V
V
-1.2
-0.8
Dynamic Low Level
Quiet Output (note 1,
2)
-0.5
V
Dynamic High Voltage
Input (note 1, 3)
IHDA
5.0
5.0
5.0
5.0
3.3
3.3
3.3
3.3
2
2
V
V
V
V
V
Dynamic Low Voltage
Input (note 1, 3)
ILDA
IHDB
0.8
0.8
V
Dynamic High Voltage
Input (note 1, 3)
V
Dynamic Low Voltage
Input (note 1, 3)
ILDB
1) Worst case package
2) Max number of output defined as (n). Data inputs are driven 0V to 3.3V, (n-1) outputs switching and one output at GND
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3V to threshold (V ). 0V to threshold
ILD
(V ) f = 1MHz
IHD
4/13
74LVX4245
Table 9: AC Electrical Characteristics (C = 50pF, Input t = t = 3ns)
L
r
f
(3)
Test Condition
Value
Symbol
Parameter
Unit
T = 25°C
-40 to 85°C -55 to 125°C
A
V
CCB
(V)
Min. Typ. Max. Min. Max. Min. Max.
t
t
Propagation Delay
Time (An to Bn)
2.7
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
10.0
9.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
11.0
10.0
11.0
10.0
12.5
11.5
11.5
11.5
11.0
11.0
8.5
PLH
(*)
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
5.1
5.3
6.5
6.7
6.0
3.3
5.4
5.5
5.2
5.8
3.9
8.5
8.5
10.0
10.0
9.5
6.5
8.5
8.5
9.0
9.0
7.0
3.0
2.7
ns
ns
ns
ns
ns
Propagation Delay
Time (An to Bn)
10.0
9.0
PHL
(*)
3.0
2.7
t
Output Enable
Time (G to Bn)
11.5
10.5
11.5
10.5
10.0
10.0
7.5
PZL
PZH
(*)
3.0
2.7
t
Output Enable
Time (G to Bn)
(*)
3.0
2.7
t
Output Disable
Time (G to Bn)
PLZ
PHZ
(*)
3.0
2.7
t
Output Disable
Time (G to Bn)
(*)
7.0
8.0
3.0
2.7
t
t
Propagation Delay
Time (Bn to An)
10.0
9.0
11.0
10.0
11.0
10.0
11.0
10.5
11.0
10.5
8.5
PLH
(*)
3.0
2.7
Propagation Delay
Time (Bn to An)
10.0
9.0
PHL
(*)
3.0
2.7
t
Output Enable
Time (G to An)
10.0
9.5
PZL
PZH
(*)
3.0
2.7
t
Output Enable
Time (G to An)
10.0
9.5
(*)
3.0
2.7
t
Output Disable
Time (G to An)
7.5
PLZ
(*)
7.5
8.5
3.0
2.7
ns
ns
t
Output Disable
Time (G to An)
7.5
8.5
PHZ
(*)
2.9
0.5
0.5
6.5
1.0
1.0
7.0
8.0
3.0
2.7
t
t
Output To Output
Skew Time (note1,
2)
1.5
1.5
OSLH
OSHL
(**)
1.5
1.5
3.3
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
3) Typical values at V
= 5.0V, V
= 3.3V
CCA
CCB
(*) Voltage range is 3.0V ± 0.3V
5/13
74LVX4245
Table 10: Capacitive Characteristics
Test Condition
Value
T = 25 °C
Symbol
Parameter
-40 to 85 °C -55 to 125°C Unit
A
V
V
CCB
CCA
(V)
(V)
Min. Typ. Max. Min. Max. Min. Max.
C
Input
Capacitance
open open
4.5
10
55
10
10
10
V
V
V
INA
C
C
Input/Output
Capacitance
3.3
3.3
5.0
5.0
I/O
Dynamic Low
Level Quiet
Output (note 1)
A to B
PD
C
Dynamic Low
Level Quiet
Output (note 1)
B to A
3.3
5.0
40
V
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 current can be obtained by the following equation. I
= C x V x f + I /8 (per circuit)
CC(opr)
PD CC IN CC
Figure 3: Test Circuit
TEST
SWITCH
t
t
t
, t
Open
PLH PHL
, t
2V
CC
PZLH PLZ
, t
Open
PZH PHZ
C
R
R
= 50pF or equivalent (includes jig and probe capacitance)
L
L
T
= R = 500Ω or equivalent
1
OUT
= Z
of pulse generator (typically 50Ω)
6/13
74LVX4245
Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
7/13
74LVX4245
SO-24 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
15.20
7.4
0.30
0.51
0.32
15.60
7.6
0.004
0.013
0.009
0.598
0.291
0.012
0.020
0.013
0.614
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
0070769C
8/13
74LVX4245
TSSOP24 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.1
MIN.
MAX.
0.043
0.006
A
A1
A2
b
0.05
0.15
0.002
0.9
0.035
0.19
0.09
7.7
0.30
0.20
7.9
0.0075
0.0035
0.303
0.0118
0.0079
0.311
c
D
E
4.3
4.5
0.169
0.177
e
0.65 BSC
0.0256 BSC
H
K
6.25
0°
6.5
8°
0.246
0°
0.256
8°
L
0.50
0.70
0.020
0.028
A2
A
K
L
b
e
A1
H
c
D
E
PIN 1 IDENTIFICATION
1
7047476B
9/13
74LVX4245
Tape & Reel SO-24 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
11.0
15.9
3.1
1.197
0.433
0.626
0.122
0.161
0.476
Ao
Bo
Ko
Po
P
10.8
15.7
2.9
0.425
0.618
0.114
0.153
0.468
3.9
4.1
11.9
12.1
10/13
74LVX4245
Tape & Reel TSSOP24 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
0.331
0.075
0.161
0.476
Ao
Bo
Ko
Po
P
6.8
8.2
0.268
0.323
0.067
0.153
0.468
8.4
1.9
4.1
12.1
1.7
3.9
11.9
11/13
74LVX4245
Table 11: Revision History
Date
Revision
Description of Changes
Ordering Codes Revision - pag. 1.
27-Aug-2004
6
12/13
74LVX4245
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.
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All other names are the property of their respective owners
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