MM54HC42/MM74HC42 BCD-to-Decimal Decoder

MM54HC42MM74HC42
BCD-to-Decimal Decoder
General Description
This decoder utilizes advanced silicon-gate CMOS technology
Data on the four input pins select one of the 10 outputs
corresponding to the value of the BCD number on the inputs
An output will go low when selected otherwise it remains
high If the input data is not a valid BCD number all
outputs will remain high The circuit has high noise immunity
and low power consumption usually associated with CMOS
circuitry yet also has speeds comparable to low power
Schottky TTL (LS-TTL) circuits and is capable of driving 10
LS-TTL equivalent loads
Connection Diagram
Dual-in-line Package
Top View
Order Number MM54HC42 or MM74HC42
Logic Diagram
TLF5301–1
January 1988
All inputs are protected from damage due to static discharge
by diodes to V CC and ground
Features
Y
Y
Y
Y
Typical propagation delay 15 ns
Wide supply range 2V–6V
Low quiescent current 80 mA (74HC)
Fanout of 10 LS-TTL loads
Truth Table
No
Inputs
Outputs
D C B A 0 1 2 3 4 5 6 7 8 9
L L L L L H H H H H H H H H
L L L H H L H H H H H H H H
L L H L H H L H H H H H H H
L L H H H H H L H H H H H H
L H L L H H H H L H H H H H
L H L H H H H H H L H H H H
L H H L H H H H H H L H H H
L H H H H H H H H H H L H H
H L L L H H H H H H H H L H
H L L H H H H H H H H H H L
H L 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 H
INVALID H H L L H H H H H H H H H H
H H L H H H H H H H H H H H
H H H L H H H H H H H H H H
H H H H H H H H H H H H H H
HeHigh Level LeLow Level
MM54HC42MM74HC42 BCD-to-Decimal Decoder
TLF5301–2
C1995 National Semiconductor Corporation
TLF5301
RRD-B30M105Printed in U S A

Absolute Maximum Ratings (Notes12)
If MilitaryAerospace specified devices are required
please contact the National Semiconductor Sales
OfficeDistributors for availability and specifications
Supply Voltage (V CC )
b05 to a70V
DC Input Voltage (V IN )
b15 to V CC a15V
DC Output Voltage (V OUT )
b05 to V CC a05V
Clamp Diode Current (I IK I OK )
g20 mA
DC Output Current per pin (I OUT )
g25 mA
DC V CC or GND Current per pin (I CC )
g50 mA
Storage Temperature Range (T STG ) b65Ctoa150C
Power Dissipation (P D )
(Note 3)
600 mW
SO Package only
500 mW
Lead Temp (T L ) (Soldering 10 seconds)
260C
Operating Conditions
Min Max Units
Supply Voltage V CC V
DC Input or Output Voltage V CC V
V IN V OUT
Operating Temp Range (T A )
MMHC b a C
MMHC b a C
Input Rise or Fall Times
t r t f V CC eV
ns
V CC eV ns
V CC eV ns
DC Electrical Characteristics (Note 4)
74HC
54HC
T A e25C
Symbol Parameter Conditions V CC T A eb40 to 85C T A eb55 to 125C Units
Typ
Guaranteed Limits
V IH Minimum High Level V V
Input Voltage V V
V V
V IL Maximum Low Level V V
Input Voltage V V
V V
V OH Minimum High Level V IN eV IH or V IL
Output Voltage lI OUTl s mA V V
V V
V V
V IN eV IH or V IL
lI OUTl s mA V V
lI OUTl s mA V V
V OL Minimum Low Level V IN eV IH or V IL
Output Voltage lI OUTl s mA V V
V V
V V
V IN eV IH or V IL
lI OUTl s mA V V
lI OUTl s mA V V
I IN Maximum Input V IN eV CC or GND V g g g mA
Current
I CC Maximum Quiescent V IN eV CC or GND V mA
Supply Current I OUT e mA
Note 1 Absolute Maximum Ratings are those values beyond which damage to the device may occur
Note 2 Unless otherwise specified all voltages are referenced to ground
Note 3 Power Dissipation temperature derating plastic ‘‘N’’ package b12 mWC from 65C to85C ceramic ‘‘J’’ package b12 mWC from 100C to125C
Note 4 For a power supply of 5V g10% the worst case output voltages (V OH and V OL ) occur for HC at 45V Thus the 45V values should be used when
designing with this supply Worst case V IH and V IL occur at V CC e55V and 45V respectively (The V IH value at 55V is 385V) The worst case leakage current (I IN
I CC and I OZ ) occur for CMOS at the higher voltage and so the 60V values should be used
V IL limits are currently tested at 20% of V CC The above V IL specification (30% of V CC ) will be implemented no later than Q1 CY’89
2

AC Electrical Characteristics V CC e5V T A e25C C L e15 pF t r et f e6ns
Symbol Parameter Conditions Typ
Guaranteed
Limit
t PHL t PLH Maximum Propagation 15 25 ns
Delay
Units
AC Electrical Characteristics V CC e20V to 60V C L e50 pF t r et f e6 ns (unless otherwise specified)
74HC
54HC
T A e25C
Symbol Parameter Conditions V CC T A eb40 to 85C T A eb55 to 125C Units
Typ
Guaranteed Limits
t PHL t PLH Maximum Propagation V ns
Delay V ns
V ns
t TLH t THL Maximum Output Rise V ns
and Fall Time V ns
V ns
C PD Power Dissipation per package pF
Capacitance Note
C IN Maximum Input pF
Capacitance
Note 5 C PD determines the no load dynamic power consumption P D eC PD V 2 CC faI CC V CC and the no load dynamic current consumption I S eC PD V CC faI CC
3

MM54HC42MM74HC42 BCD-to-Decimal Decoder
Physical Dimensions inches (millimeters)
Order Number MM54HC42J or MM54HC42J
NS Package J16A
Order Number MM54HC42N
NS Package N16E
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