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MC74LCX245
Low-Voltage CMOS Octal
Transceiver
With 5 V−Tolerant Inputs and Outputs
(3−State, Non−Inverting)
The MC74LCX245 is a high performance, non−inverting octal
transceiver operating from a 2.0 to 5.5 V supply. High impedance TTL
compatible inputs significantly reduce current loading to input drivers
while TTL compatible outputs offer improved switching noise
performance. A V
I
specification of 5.5 V allows MC74LCX245 inputs
to be safely driven from 5 V devices if V
CC
is less than 5.0 V. The
MC74LCX245 is suitable for memory address driving and all TTL
level bus oriented transceiver applications.
Current drive capability is 24 mA at both A and B ports. The
Transmit/Receive (T/R) input determines the direction of data flow
through the bi−directional transceiver. Transmit (active−HIGH)
enables data from A ports to B ports; Receive (active−LOW) enables
data from B to A ports. The Output Enable input, when HIGH,
disables both A and B ports by placing them in a HIGH Z condition.
Features
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MARKING
DIAGRAMS
20
20
1
SOIC−20
DW SUFFIX
CASE 751D
1
20
TSSOP−20
DT SUFFIX
CASE 948E
1
LCX
245
ALYWG
G
LCX245
AWLYYWWG
20
1
•
•
•
•
•
•
•
•
Designed for 2.0 to 5.5 V V
CC
Operation
5 V Tolerant
−
Interface Capability With 5 V TTL Logic
Supports Live Insertion and Withdrawal
I
OFF
Specification Guarantees High Impedance When V
CC
= 0 V
LVTTL Compatible
LVCMOS Compatible
24 mA Balanced Output Sink and Source Capability
20
1
20
SOEIAJ−20
M SUFFIX
CASE 967
1
74LCX245
AWLYWWG
1
Near Zero Static Supply Current in All Three Logic States (10
mA)
Substantially Reduces System Power Requirements
•
Latchup Performance Exceeds 500 mA
•
ESD Performance:
Human Body Model >2000 V
Machine Model >200 V
•
Pb−Free Packages are Available*
A
L, WL
Y, YY
W, WW
G or
G
QFN20
MN SUFFIX
CASE 485AA
LCX
245
ALYWG
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
1
Publication Order Number:
MC74LCX245/D
©
Semiconductor Components Industries, LLC, 2009
December, 2009
−
Rev. 9
MC74LCX245
V
CC
20
OE
19
B0
18
B1
17
B2
16
B3
15
B4
14
B5
13
B6
12
B7
11
OE 19
T/R 1
2
18
B0
A0
1
T/R
2
A0
3
A1
19
4
A2
5
A3
6
A4
7
A5
8
A6
12
9
A7
10
GND
A1
3
17
B1
A2
20
PIN #1
11
QFN
10
A3
2
9
A4
4
16
5
15
6
14
B4
B3
B2
Figure 1. Pinout
(Top View)
PIN NAMES
PINS
OE
T/R
A0−A7
B0−B7
FUNCTION
Output Enable Input
Transmit/Receive Input
Side A 3−State Inputs or 3−State Outputs
Side B 3−State Inputs or 3−StateOutputs
A5
7
13
B5
A6
8
12
B6
A7
9
11
B7
TRUTH TABLE
INPUTS
OE
L
L
H
T/R
L
H
X
OPERATING MODE
Non−Inverting
B Data to A Bus
A Data to B Bus
Z
Figure 2. Logic Diagram
H = High Voltage Level
L = Low Voltage Level
Z = High Impedance State
X = High or Low Voltage Level and Transitions are Acceptable
For I
CC
reasons, Do Not Float Inputs
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2
MC74LCX245
MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
Parameter
DC Supply Voltage
DC Input Voltage
DC Output Voltage
Value
−0.5
to +7.0
−0.5
≤
V
I
≤
+7.0
−0.5
≤
V
O
≤
+7.0
−0.5
≤
V
O
≤
V
CC
+ 0.5
DC Input Diode Current
DC Output Diode Current
−50
−50
+50
DC Output Source/Sink Current
DC Supply Current Per Supply Pin
DC Ground Current Per Ground Pin
Storage Temperature Range
±50
±100
±100
−65
to +150
Output in 3−State
Output in HIGH or LOW State (Note 1)
V
I
< GND
V
O
< GND
V
O
> V
CC
Condition
Unit
V
V
V
V
mA
mA
mA
mA
mA
mA
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. I
O
absolute maximum rating must be observed.
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
I
OH
Supply Voltage
Input Voltage
Output Voltage
HIGH Level Output Current
(HIGH or LOW State)
(3−State)
V
CC
= 3.0 V
−
3.6 V
V
CC
= 2.7 V
−
3.0 V
V
CC
= 2.3 V
−
2.7 V
V
CC
= 3.0 V
−
3.6 V
V
CC
= 2.7 V
−
3.0 V
V
CC
= 2.3 V
−
2.7 V
−55
0
Parameter
Operating
Data Retention Only
Min
2.0
1.5
0
0
0
Typ
2.5, 3.3
2.5, 3.3
Max
5.5
5.5
5.5
V
CC
5.5
−
24
−
12
−
8
+ 24
+ 12
+8
+125
10
Unit
V
V
V
mA
I
OL
LOW Level Output Current
mA
T
A
Dt/DV
Operating Free−Air Temperature
Input Transition Rise or Fall Rate, V
IN
from 0.8 V to 2.0 V, V
CC
= 3.0 V
°C
ns/V
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3
MC74LCX245
DC ELECTRICAL CHARACTERISTICS
T
A
=
−55°C
to +125°C
Symbol
V
IH
V
IL
V
OH
Characteristic
HIGH Level Input Voltage (Note 2)
Condition
2.3 V
≤
V
CC
≤
2.7 V
2.7 V
≤
V
CC
≤
3.6 V
LOW Level Input Voltage (Note 2)
2.3 V
≤
V
CC
≤
2.7 V
2.7 V
≤
V
CC
≤
3.6 V
HIGH Level Output Voltage
2.3 V
≤
V
CC
≤
3.6 V; I
OL
= 100
mA
V
CC
= 2.3 V; I
OH
=
−8
mA
V
CC
= 2.7 V; I
OH
=
−12
mA
V
CC
= 3.0 V; I
OH
=
−18
mA
V
CC
= 3.0 V; I
OH
=
−24
mA
V
OL
LOW Level Output Voltage
2.3 V
≤
V
CC
≤
3.6 V; I
OL
= 100
mA
V
CC
= 2.3 V; I
OL
= 8 mA
V
CC
= 2.7 V; I
OL
= 12 mA
V
CC
= 3.0 V; I
OL
= 16 mA
V
CC
= 3.0 V; I
OL
= 24 mA
I
I
I
OZ
I
OFF
I
CC
DI
CC
Input Leakage Current
3−State Output Current
Power−Off Leakage Current
Quiescent Supply Current
2.3 V
≤
V
CC
≤
3.6 V; 0 V
≤
V
I
≤
5.5 V
2.3
≤
V
CC
≤
3.6 V; 0V
≤
V
O
≤
5.5 V;
V
I
= V
IH
or V
IL
V
CC
= 0 V; V
I
or V
O
= 5.5 V
2.3
≤
V
CC
≤
3.6 V; V
I
= GND or V
CC
2.3
≤
V
CC
≤
3.6 V; 3.6
≤
V
I
or V
O
≤
5.5 V
Increase in I
CC
per Input
2.3
≤
V
CC
≤
3.6 V; V
IH
= V
CC
−
0.6 V
2. These values of V
I
are used to test DC electrical characteristics only.
V
CC
−
0.2
1.8
2.2
2.4
2.2
0.2
0.6
0.4
0.4
0.55
±5
±5
10
10
±10
500
mA
mA
mA
mA
mA
V
Min
1.7
2.0
0.7
0.8
V
V
Max
Unit
V
AC CHARACTERISTICS
t
R
= t
F
= 2.5 ns; R
L
= 500
W
Limits
T
A
=
−55°C
to +125°C
V
CC
= 3.3 V
±
0.3V
C
L
= 50 pF
Symbol
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
OSHL
t
OSLH
Parameter
Propagation Delay
Input to Output
Output Enable Time
to High and Low Level
Output Disable Time From
High and Low Level
Output−to−Output Skew
(Note 3)
Waveform
1
2
2
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
7.0
7.0
8.5
8.5
7.5
7.5
1.0
1.0
V
CC
= 2.7 V
C
L
= 50 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
8.0
8.0
9.5
9.5
8.5
8.5
1.0
1.0
V
CC
= 2.5 V
±
0.2V
C
L
= 30 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
8.4
8.4
10.5
10.5
9.0
9.0
1.0
1.0
V
CC
= 5.0 V
C
L
= 50 pF
Min
1.5
1.5
1.5
1.5
1.5
1.5
Max
5.0
5.0
7.0
7.0
6.0
6.0
1.0
1.0
Unit
ns
ns
ns
ns
3. Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device.
The specification applies to any outputs switching in the same direction, either HIGH−to−LOW (t
OSHL
) or LOW−to−HIGH (t
OSLH
); parameter
guaranteed by design.
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4
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