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System Logic Semiconductor
System Logic Semiconductor

HC138 Datasheet

1-of-8 Decoder/Demultiplexer


HC138 Datasheet Preview


SL74HC138
1-of-8 Decoder/Demultiplexer
High-Performance Silicon-Gate CMOS
The SL74HC138 is identical in pinout to the LS/ALS138. The device
inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
The SL74HC138 decodes a three-bit Address to one-of-eight active-
low outputs. This device features three Chip Select inputs, two active-
low and one active-high to facilitate the demultiplexing, cascading, and
chip-selecting functions. The demultiplexing function is accomplished
by using the Address inputs to select the desired device output; one
of the Chip Selects is used as a data input while the other Chip Selects
are held in their active states.
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0 µA
High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
SL74HC138N Plastic
SL74HC138D SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =VCC
PIN 8 = GND
SLS
System Logic
Semiconductor
FUNCTION TABLE
Inputs
Outputs
CS1CS2CS3 A2 A1A0
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
XXH
XHX
LXX
XXX
XXX
XXX
H H H HHHHH
H H H HHHHH
H H H HHHHH
HLL
HLL
HLL
HLL
LLL
LLH
LHL
LHH
L H H HHHHH
H L H HHHHH
H H L HHHHH
H H H LHHHH
HLL
HLL
HLL
HLL
HLL
HLH
HHL
HHH
H H H HLHHH
H H H HHLHH
H H H HHHLH
H H H HHHHL
H = high level (steady state)
L = low level (steady state)
X = don’t care
Page 1

SL74HC138
MAXIMUM RATINGS*
Symbol
VCC
VIN
VOUT
IIN
IOUT
ICC
PD
Parameter
DC Supply Voltage (Referenced to GND)
DC Input Voltage (Referenced to GND)
DC Output Voltage (Referenced to GND)
DC Input Current, per Pin
DC Output Current, per Pin
DC Supply Current, VCC and GND Pins
Power Dissipation in Still Air, Plastic DIP+
SOIC Package+
Value
-0.5 to +7.0
-1.5 to VCC +1.5
-0.5 to VCC +0.5
±20
±25
±50
750
500
Tstg Storage Temperature
TL Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)
-65 to +150
260
*Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
+Derating - Plastic DIP: - 10 mW/°C from 65° to 125°C
SOIC Package: : - 7 mW/°C from 65° to 125°C
Unit
V
V
V
mA
mA
mA
mW
°C
°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
VIN, VOUT
TA
tr, tf
DC Supply Voltage (Referenced to GND)
DC Input Voltage, Output Voltage (Referenced to GND)
Operating Temperature, All Package Types
Input Rise and Fall Time (Figure 2)
VCC =2.0 V
VCC =4.5 V
VCC =6.0 V
Min Max Unit
2.0 6.0
V
0 VCC
-55 +125
V
°C
0 1000 ns
0 500
0 400
This device contains protection circuitry to guard against damage due to high static voltages or electric
fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated
voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range
GND(VIN or VOUT)VCC.
Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC).
Unused outputs must be left open.
SLS
System Logic
Semiconductor
Page 2

SL74HC138
DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND)
Symbol
Parameter
Test Conditions
VIH Minimum High-Level VOUT=0.1 V or VCC-0.1 V
Input Voltage
IOUT≤ 20 µA
VIL Maximum Low -Level VOUT=0.1 V or VCC-0.1 V
Input Voltage
IOUT ≤ 20 µA
VOH Minimum High-Level VIN=VIH or VIL
Output Voltage
IOUT ≤ 20 µA
VIN=VIH or VIL
IOUT ≤ 4.0 mA
IOUT ≤ 5.2 mA
VOL Maximum Low-Level VIN=VIH or VIL
Output Voltage
IOUT ≤ 20 µA
VIN=VIH or VIL
IOUT ≤ 4.0 mA
IOUT ≤ 5.2 mA
IIN Maximum Input
Leakage Current
VIN=VCC or GND
ICC Maximum Quiescent VIN=VCC or GND
Supply Current
IOUT=0µA
(per Package)
VCC Guaranteed Limit
V 25 °C 85 125 Unit
to °C °C
-55°C
2.0 1.5 1.5 1.5
4.5 3.15 3.15 3.15
6.0 4.2 4.2 4.2
V
2.0 0.5 0.5 0.5
4.5 1.35 1.35 1.35
6.0 1.8 1.8 1.8
V
2.0 1.9
4.5 4.4
6.0 5.9
1.9 1.9
4.4 4.4
5.9 5.9
V
4.5 3.98 3.84 3.7
6.0 5.48 5.34 5.2
2.0 0.1
4.5 0.1
6.0 0.1
0.1 0.1
0.1 0.1
0.1 0.1
V
4.5 0.26 0.33 0.4
6.0 0.26 0.33 0.4
6.0 ±0.1 ±1.0 ±1.0 µA
6.0 4.0
40 160 µA
SLS
System Logic
Semiconductor
Page 3
Part Number HC138
Manufactur System Logic Semiconductor
Description 1-of-8 Decoder/Demultiplexer
Total Page 5 Pages
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