1/9
February 2002
s
5V TOLERANT INPUTS
s
HIGH SPEED: t
PD
= 6.3ns (MAX.) at V
CC
= 3V
s
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24mA (MIN) at V
CC
= 3V
s
PCI BUS LEVELS GUARANTEED AT 24 mA
s
BALANCED PROPAGATION DELAYS:
t
PLH
t
PHL
s
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 1.65V to 3.6V (1.2V Data
Retention)
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
s
LATCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
s
ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
DESCRIPTION
The 74LVC245A is a low voltage CMOS OCTAL
BUS TRANSCEIVER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for 1.65 to 3.6
V
CC
operations and low power and low noise
applications.
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.
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.
74LVC245A
LOW VOLTAGE CMOS OCTAL BUS TRANSCEIVER
(NOT INVERTED) HIGH PERFORMANCE
.
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
SOP
74LVC245AM
74LVC245AMTR
TSSOP
74LVC245ATTR
TSSOP
SOP
74LVC245A
2/9
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don't Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
1) I
O
absolute maximum rating must be observed
2) V
O
< GND
PIN No
SYMBOL
NAME AND FUNCTION
1
DIR
Directional Control
2, 3, 4, 5, 6,
7, 8, 9
A1 to A8
Data Inputs/Outputs
18, 17, 16,
15, 14, 13,
12, 11
B1 to B8
Data Inputs/Outputs
19
G
Output Enable Input
10
GND
Ground (0V)
20
V
CC
Positive Supply Voltage
INPUTS
FUNCTION
OUTPUT
G
DIR
A BUS
B BUS
Yn
L
L
OUTPUT
INPUT
A = B
L
H
INPUT
OUTPUT
B = A
H
X
Z
Z
Z
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage
-0.5 to +7.0
V
V
I
DC Input Voltage
-0.5 to +7.0
V
V
O
DC Output Voltage (High Impedance or V
CC
= 0V)
-0.5 to +7.0
V
V
O
DC Output Voltage (High or Low State) (note 1)
-0.5 to V
CC
+ 0.5
V
I
IK
DC Input Diode Current
- 50
mA
I
OK
DC Output Diode Current (note 2)
- 50
mA
I
O
DC Output Current
50
mA
I
CC
or I
GND
DC V
CC
or Ground Current per Supply Pin
100
mA
T
stg
Storage Temperature
-65 to +150
C
T
L
Lead Temperature (10 sec)
300
C
74LVC245A
3/9
RECOMMENDED OPERATING CONDITIONS
1) Truth Table guaranteed: 1.2V to 3.6V
2) V
IN
from 0.8V to 2V at V
CC
= 3.0V
DC SPECIFICATIONS
Symbol
Parameter
Value
Unit
V
CC
Supply Voltage (note 1)
1.65 to 3.6
V
V
I
Input Voltage
0 to 5.5
V
V
O
Output Voltage (High Impedance or V
CC
= 0V)
0 to 5.5
V
V
O
Output Voltage (High or Low State)
0 to V
CC
V
I
OH
, I
OL
High or Low Level Output Current (V
CC
= 3.0 to 3.6V)
24
mA
I
OH
, I
OL
High or Low Level Output Current (V
CC
= 2.7 to 3.0V)
12
mA
I
OH
, I
OL
High or Low Level Output Current (V
CC
= 2.3 to 2.7V)
8
mA
I
OH
, I
OL
High or Low Level Output Current (V
CC
= 1.65 to 2.3V)
4
mA
T
op
Operating Temperature
-55 to 125
C
dt/dv
Input Rise and Fall Time (note 2)
0 to 10
ns/V
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
-40 to 85 C
-55 to 125 C
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
1.65 to 1.95
0.65V
CC
0.65V
CC
V
2.3 to 2.7
1.7
1.7
2.7 to 3.6
2
2
V
IL
Low Level Input
Voltage
1.65 to 1.95
0.35V
CC
0.35V
CC
V
2.3 to 2.7
0.7
0.7
2.7 to 3.6
0.8
0.8
V
OH
High Level Output
Voltage
1.65 to 3.6
I
O
=-100
A
V
CC
-0.2
V
CC
-0.2
V
1.65
I
O
=-4 mA
1.2
1.2
2.3
I
O
=-8 mA
1.7
1.7
2.7
I
O
=-12 mA
2.2
2.2
3.0
I
O
=-18 mA
2.4
2.4
3.0
I
O
=-24 mA
2.2
2.2
V
OL
Low Level Output
Voltage
1.65 to 3.6
I
O
=100
A
0.2
0.2
V
1.65
I
O
=4 mA
0.45
0.45
2.3
I
O
=8 mA
0.7
0.7
2.7
I
O
=12 mA
0.4
0.4
3.0
I
O
=24 mA
0.55
0.55
I
I
Input Leakage
Current
3.6
V
I
= 0 to 5.5V
5
5
A
I
off
Power Off Leakage
Current
0
V
I
or V
O
= 5.5V
10
10
A
I
OZ
High Impedance
Output Leakage
Current
3.6
V
I
= V
IH
orV
IL
V
O
= 0 to 5.5V
10
10
A
I
CC
Quiescent Supply
Current
3.6
V
I
= V
CC
or GND
10
10
A
V
I
or V
O
= 3.6 to
5.5V
10
10
I
CC
I
CC
incr. per Input
2.7 to 3.6
V
IH
= V
CC
-0.6V
500
500
A
74LVC245A
4/9
DYNAMIC SWITCHING CHARACTERISTICS
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.
AC ELECTRICAL CHARACTERISTICS
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
OSLH
= | t
PLHm
- t
PLHn
|, t
OSHL
= | t
PHLm
- t
PHLn
|
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
1) C
PD
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. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/n (per circuit)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25 C
Min.
Typ.
Max.
V
OLP
Dynamic Low Level Quiet
Output (note 1)
3.3
C
L
= 50pF
V
IL
= 0V, V
IH
= 3.3V
0.8
V
V
OLV
-0.8
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
C
L
(pF)
R
L
(
)
t
s
= t
r
(ns)
-40 to 85 C
-55 to 125 C
Min.
Max.
Min.
Max.
t
PLH
t
PHL
Propagation Delay
Time
1.65 to 1.95
30
1000
2.0
2.0
9.0
2.0
12
ns
2.3 to 2.7
30
500
2.0
2.0
8.0
2.0
10.5
2.7
50
500
2.5
1.5
7.3
1.5
8.8
3.0 to 3.6
50
500
2.5
1.0
6.3
1.0
7.6
t
PZL
t
PZH
Output Enable Time
1.65 to 1.95
30
1000
2.0
2.0
12
2.0
16
ns
2.3 to 2.7
30
500
2.0
2.0
9.5
2.0
12.5
2.7
50
500
2.5
1.0
9.0
1.0
11
3.0 to 3.6
50
500
2.5
1.0
8.5
1.0
10
t
PLZ
t
PHZ
Output Disable Time 1.65 to 1.95
30
1000
2.0
2.0
11
2.0
14
ns
2.3 to 2.7
30
500
2.0
2.0
9.0
2.0
12
2.7
50
500
2.5
2.0
8.5
2.0
10
3.0 to 3.6
50
500
2.5
2.0
7.5
2.0
9.0
t
OSLH
t
OSHL
Output To Output
Skew Time (note1,
2)
2.7 to 3.6
1
1
ns
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
T
A
= 25 C
Min.
Typ.
Max.
C
IN
Input Capacitance
4
pF
C
PD
Power Dissipation Capacitance
(note 1)
1.8
f
IN
= 10MHz
28
pF
2.5
30
3.3
34
74LVC245A
5/9
TEST CIRCUIT
R
T
= Z
OUT
of pulse generator (typically 50
)
TEST CIRCUIT AND WAVEFORM SYMBOL VALUE
Symbol
V
CC
1.65 to 1.95V
2.3 to 2.7V
2.7V
3.0 to 3.6V
C
L
30pF
30pF
50pF
50pF
R
L
=
R
1
1000
500
500
500
V
S
2 x V
CC
2 x V
CC
6V
6V
V
IH
V
CC
V
CC
2.7V
2.7V
V
M
V
CC
/2
V
CC
/2
1.5V
1.5V
V
OH
V
CC
V
CC
3.0V
3.0V
V
X
V
OL
+ 0.15V
V
OL
+ 0.15V
V
OL
+ 0.3V
V
OL
+ 0.3V
V
Y
V
OH
- 0.15V
V
OH
- 0.15V
V
OH
- 0.3V
V
OH
- 0.3V
t
r
= t
r
<2.0ns
<2.0ns
<2.5ns
<2.5ns
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