Motorola MC74LCX138MEL, MC74LCX138SD, MC74LCX138M, MC74LCX138D, MC74LCX138DR2 Datasheet
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SEMICONDUCTOR TECHNICAL DATA
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The MC74LCX138 is a high performance, 1–of–8 decoder/
demultiplexer operating from a 2.7 to 3.6V supply. High impedance TTL
compatible inputs significantly reduce current loading to input drivers
while TTL compatible outputs offer improved switching noise
performance. A VI specification of 5.5V allows MC74LCX138 inputs to be
safely driven from 5V devices. The MC74LCX138 is suitable for memory
address decoding and other TTL level bus oriented applications.
The MC74LCX138 high–speed 1–of–8 decoder/demultiplexer accepts
three binary weighted inputs (A0, A1, A2) and, when enabled, provides
eight mutually exclusive active–LOW outputs (O0
features three Enable inputs, two active–LOW (E1
active–HIGH (E3). All outputs will be HIGH unless E1
and E3 is HIGH. This multiple enabled function allows easy parallel
expansion of the device to a 1–of–32 (5 lines to 32 lines) decoder with just
four LCX138 devices and one inverter (See Figure 1). The LCX138 can
be used as an 8–output demultiplexer by using one of the active–LOW
Enable inputs as the data input and the other Enable inputs as strobes.
The Enable inputs which are not used must be permanently tied to their
appropriate active–HIGH or active–LOW state.
Current drive capability is 24mA at the outputs.
–O7). The LCX138
, E2) and one
and E2 are LOW,
LOW–VOLTAGE CMOS
DECODER/DEMULTIPLEXER
D SUFFIX
16
1
16
1
PLASTIC SOIC
CASE 751B–05
M SUFFIX
PLASTIC SOIC EIAJ
CASE 966–01
• Designed for 2.7 to 3.6V V
Operation
CC
• 5V Tolerant Inputs — Interface Capability With 5V TTL Logic
• LVTTL Compatible
• LVCMOS Compatible
• 24mA Balanced Output Sink and Source Capability
• Near Zero Static Supply Current (10µA) Substantially Reduces System
Power Requirements
• Latchup Performance Exceeds 500mA
• ESD Performance: Human Body Model >2000V; Machine Model >200V
Pinout: 16–Lead Plastic Package (Top View)
V
CC
A0 A1 A2 E1 E2 E3 O7 GND
O1 O2 O3 O4 O5 O6
O0
1516 14 13 12 11 10
21 34567
9
8
16
16
PIN NAMES
Pins
A0–A2
E1
–E2
E3
O0–O7
1
1
Function
Address Inputs
Enable Inputs
Enable Input
Outputs
SD SUFFIX
PLASTIC SSOP
CASE 940B–03
DT SUFFIX
PLASTIC TSSOP
CASE 948F–01
11/96
Motorola, Inc. 1996
1
REV 1
MC74LCX138
LOGIC DIAGRAM
A2 A1 A0 E1 E2 E3
654123
7 9 10 11 12 13 14 15
O7 O6 O5 O4 O3 O2 O1 O0
INPUTS OUTPUTS
E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7
H
X
X
L
L
L
L
L
L
L
L
H = High Voltage Level; L = Low V oltage Level; X = High or Low V oltage Level and T ransitions Are Acceptable; For ICC reasons, DO NOT FLOAT
Inputs
X
H
X
L
L
L
L
L
L
L
L
X
X
L
H
H
H
H
H
H
H
H
X
X
X
L
H
L
H
L
H
L
H
X
X
X
L
L
H
H
L
L
H
H
X
X
X
L
L
L
L
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
L
A0
A1
A2
A3
A4
A0 A1 A2 E
O0 O1 O2 O3 O4 O5 O6 O7
O0
H
123 123 123 123
A0 A1 A2 E
O0 O1 O2 O3 O4 O5 O6 O7
A0 A1 A2 E
O0 O1 O2 O3 O4 O5 O6 O7
A0 A1 A2 E
O0 O1 O2 O3 O4 O5 O6 O7
‘04
O31
Figure 1. Expansion to 1–of–32 Decoding
MOTOROLA LCX DATA
2
BR1339 — REV 3
MC74LCX138
ABSOLUTE MAXIMUM RATINGS*
Symbol Parameter Value Condition Unit
V
CC
V
I
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
STG
* Absolute maximum continuous ratings are those values beyond which damage to the device may occur. Exposure to these conditions or
conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute–maximum–rated conditions is
not implied.
1. Output in HIGH or LOW State. IO absolute maximum rating must be observed.
DC Supply Voltage –0.5 to +7.0 V
DC Input Voltage –0.5 ≤ VI ≤ +7.0 V
DC Output Voltage –0.5 ≤ VO ≤ VCC + 0.5 Note 1. V
DC Input Diode Current –50 VI < GND mA
DC Output Diode Current –50 VO < GND mA
+50 VO > V
DC Output Source/Sink Current ±50 mA
DC Supply Current Per Supply Pin ±100 mA
DC Ground Current Per Ground Pin ±100 mA
Storage Temperature Range –65 to +150 °C
CC
mA
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min Typ Max Unit
V
CC
V
I
V
O
I
OH
I
OL
I
OH
I
OL
T
A
∆t/∆V Input Transition Rise or Fall Rate, VIN from 0.8V to 2.0V ,
Supply Voltage Operating
Data Retention Only
Input Voltage 0 5.5 V
Output Voltage (HIGH or LOW State) 0 V
HIGH Level Output Current, VCC = 3.0V – 3.6V –24 mA
LOW Level Output Current, VCC = 3.0V – 3.6V 24 mA
HIGH Level Output Current, VCC = 2.7V – 3.0V –12 mA
LOW Level Output Current, VCC = 2.7V – 3.0V 12 mA
Operating Free–Air Temperature –40 +85 °C
VCC = 3.0V
2.0
1.5
0 10 ns/V
3.3
3.3
3.6
3.6
CC
V
V
LCX DATA
BR1339 — REV 3
3 MOTOROLA
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