STMICROELECTRONICS 74LVX245

74LVX245
LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER
(3-STATE) WITH 5V TOLERANT INPUTS
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HIGH SPEED:
tPD=4.7ns (TYP.) at VCC = 3.3V
5V TOLERANT INPUTS
POWER-DOWN PROTECTION ON INPUTS
INPUT VOLTAGE LEVEL:
VIL = 0.8V, VIH = 2V at VCC =3V
LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA=25°C
LOW NOISE:
VOLP = 0.5V (TYP.) at VCC =3.3V
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 4 mA (MIN) at VCC =3V
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
OPERATING VOLTAGE RANGE:
VCC(OPR) = 2V to 3.6V (1.2V Data Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74LVX245 is a low voltage CMOS OCTAL
BUS BUFFER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C2MOS technology. It is ideal for low
power, battery operated and low noise 3.3V
applications.
This IC is intended for two-way asynchronous
communication between data busses; the
direction of data transmission is determined by
SOP
TSSOP
Table 1: Order Codes
PACKAGE
T&R
SOP
TSSOP
74LVX245MTR
74LVX245TTR
DIR input. The enable input G can be used to
disable the device so that the busses are
effectively isolated.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage.
This device can be used to interface 5V to 3V. It
combines high speed performance with the true
CMOS low power consumption.
All inputs and outputs 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.
Figure 1: Pin Connection And IEC Logic Symbols
August 2004
Rev. 5
1/12
74LVX245
Figure 2: Input Equivalent Circuit
Table 2: Pin Description
PIN N°
SYMBOL
1
2, 3, 4, 5, 6,
7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
19
10
20
DIR
A1 to A8
Directional Control
Data Inputs/Outputs
B1 to B8
Data Inputs/Outputs
G
GND
VCC
NAME AND FUNCTION
Output Enable Input
Ground (0V)
Positive Supply Voltage
Table 3: Truth Table
INPUTS
FUNCTION
OUTPUT
G
DIR
A BUS
B BUS
L
L
H
L
H
X
OUTPUT
INPUT
Z
INPUT
OUTPUT
Z
A=B
B=A
Z
X :Don‘t Care
Z : High Impedance
Table 4: Absolute Maximum Ratings
Symbol
VCC
Parameter
Value
Unit
Supply Voltage
-0.5 to +7.0
V
VI
DC Input Voltage
-0.5 to +7.0
V
VO
DC Output Voltage
-0.5 to VCC + 0.5
V
IIK
DC Input Diode Current
- 20
mA
IOK
DC Output Diode Current
± 20
mA
IO
DC Output Current
ICC or IGND DC VCC or Ground Current
Tstg
Storage Temperature
TL
Lead Temperature (10 sec)
± 25
mA
± 50
mA
-65 to +150
°C
300
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
Table 5: Recommended Operating Conditions
Symbol
VCC
Parameter
Supply Voltage (note 1)
Unit
2 to 3.6
V
VI
Input Voltage
0 to 5.5
V
VO
Output Voltage
0 to VCC
V
Top
Operating Temperature
dt/dv
Input Rise and Fall Time (note 2) (VCC = 3V)
1) Truth Table guaranteed: 1.2V to 3.6V
2) VIN from 0.8V to 2.0V
2/12
Value
-55 to 125
°C
0 to 100
ns/V
74LVX245
Table 6: DC Specifications
Test Condition
Symbol
VIH
VIL
VOH
VOL
IOZ
II
ICC
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
High Impedance
Output Leakage
Current
Input Leakage
Current
Quiescent Supply
Current
Value
TA = 25°C
VCC
(V)
Min.
2.0
3.0
3.6
2.0
3.0
3.6
Typ.
Max.
1.5
2.0
2.4
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
1.5
2.0
2.4
0.5
0.8
0.8
Max.
1.5
2.0
2.4
0.5
0.8
0.8
Unit
V
0.5
0.8
0.8
V
2.0
IO=-50 µA
1.9
2.0
3.0
IO=-50 µA
2.9
3.0
3.0
IO=-4 mA
2.58
2.0
IO=50 µA
0.0
0.1
0.1
0.1
3.0
IO=50 µA
0.0
0.1
0.1
0.1
3.0
IO=4 mA
0.36
0.44
0.55
3.6
VI = VIH or VIL
VO = VCC or GND
±0.25
± 2.5
±5
µA
3.6
VI = 5V or GND
± 0.1
±1
±1
µA
3.6
VI = VCC or GND
4
40
40
µA
1.9
1.9
2.9
2.9
2.48
2.4
V
V
Table 7: Dynamic Switching Characteristics
Test Condition
Symbol
VOLP
VOLV
VIHD
VILD
Parameter
Dynamic Low
Voltage Quiet
Output (note 1, 2)
Dynamic High
Voltage Input
(note 1, 3)
Dynamic Low
Voltage Input
(note 1, 3)
TA = 25°C
VCC
(V)
Min.
3.3
3.3
3.3
Value
-0.8
CL = 50 pF
Typ.
Max.
0.5
0.8
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
Unit
Max.
-0.5
V
2.0
0.8
1) Worst case package.
2) Max number of outputs 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: 3.3V to threshold (VILD), 0V to threshold
(VIHD), f=1MHz.
3/12
74LVX245
Table 8: AC Electrical Characteristics (Input tr = tf = 3ns)
Test Condition
Symbol
tPLH
tPHL
tPZL
tPZH
Parameter
Propagation Delay
Time
Output Enable
Time
tPLZ
tPHZ
Output Disable
Time
tOSLH
tOSHL
Output to Output
Skew Time (note
1,2)
VCC
(V)
CL
(pF)
2.7
2.7
Value
TA = 25°C
-55 to 125°C
Typ.
Max.
Min.
Max.
Min.
Max.
15
50
6.1
8.6
11.4
14.9
1.0
1.0
13.5
17.0
1.0
1.0
15.0
18.0
3.3(*)
15
4.5
7.1
1.0
8.5
1.0
9.5
3.3(*)
2.7
2.7
50
7.2
10.6
1.0
12.0
1.0
13.0
15
50
7.1
9.6
13.8
17.3
1.0
1.0
16.5
20.0
1.0
1.0
17.5
21.0
3.3(*)
15
5.5
8.8
1.0
10.5
1.0
12.
3.3(*)
2.7
50
8.0
12.3
1.0
14.0
1.0
15.0
50
11.6
16.0
1.0
19.0
1.0
20.5
3.3(*)
2.7
50
9.7
11.4
1.0
13.0
1.0
14.5
50
0.5
1.0
1.5
1.5
(*)
50
0.5
1.0
1.5
1.5
3.3
Min.
-40 to 85°C
Unit
ns
ns
ns
ns
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the same direction, either HIGH or LOW
2) Parameter guaranteed by design
(*) Voltage range is 3.3V ± 0.3V
Table 9: Capacitive Characteristics
Test Condition
Symbol
Parameter
CIN
Input Capacitance
Ci/o
Input/Output
Capacitance
Power Dissipation
Capacitance
(note 1)
CPD
Value
TA = 25°C
VCC
(V)
Min.
Typ.
Max.
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
Unit
Max.
3.3
5
10
10
pF
3.3
10
15
15
pF
3.3
fIN = 10MHz
32
pF
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/8 (per circuit)
4/12
74LVX245
Figure 3: Test Circuit
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
VCC
tPZH, tPHZ
GND
CL =15/50pF or equivalent (includes jig and probe capacitance)
RL = R1 = 1KΩ or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
5/12
74LVX245
Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
6/12
74LVX245
SO-20 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
inch
MAX.
MIN.
TYP.
MAX.
A
2.35
2.65
0.093
0.104
A1
0.1
0.30
0.004
0.012
B
0.33
0.51
0.013
0.020
C
0.23
0.32
0.009
0.013
D
12.60
13.00
0.496
0.512
E
7.4
7.6
0.291
0.299
e
1.27
0.050
H
10.00
10.65
0.394
0.419
h
0.25
0.75
0.010
0.030
L
0.4
1.27
0.016
0.050
k
0°
8°
0°
8°
ddd
0.100
0.004
0016022D
7/12
74LVX245
TSSOP20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
A
MIN.
TYP.
MAX.
1.2
A1
0.05
A2
0.8
b
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0079
D
6.4
6.5
6.6
0.252
0.256
0.260
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
1
e
0.65 BSC
K
0˚
L
0.45
A
0.0256 BSC
0.60
8˚
0˚
0.75
0.018
8˚
0.024
0.030
A2
A1
b
K
e
L
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
8/12
74LVX245
Tape & Reel SO-20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
TYP
MAX.
MIN.
330
MAX.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
TYP.
0.504
30.4
0.519
1.197
Ao
10.8
11
0.425
0.433
Bo
13.2
13.4
0.520
0.528
Ko
3.1
3.3
0.122
0.130
Po
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
9/12
74LVX245
Tape & Reel TSSOP20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
MAX.
MIN.
330
13.2
TYP.
MAX.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
10/12
TYP
0.504
22.4
0.519
0.882
Ao
6.8
7
0.268
0.276
Bo
6.9
7.1
0.272
0.280
Ko
1.7
1.9
0.067
0.075
Po
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
74LVX245
Table 10: Revision History
Date
Revision
27-Aug-2004
5
Description of Changes
Ordering Codes Revision - pag. 1.
11/12
74LVX245
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