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M74HC238B1RSTN/a316avai3 TO 8 LINE DECODER
M74HC238M1RSTN/a13600avai3 TO 8 LINE DECODER
M74HC238RM13TRSTN/a30000avai3 TO 8 LINE DECODER


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M74HC238B1R-M74HC238M1R-M74HC238RM13TR
3 TO 8 LINE DECODER
1/10July 2001 HIGH SPEED:
tPD = 15ns (TYP.) at VCC = 6V LOW POWER DISSIPATION:
ICC = 4μA(MAX.) at TA=25°C HIGH NOISE IMMUNITY:NIH = VNIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE:OH | = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: PLH ≅ t PHL WIDE OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 238
DESCRIPTION

The M74HC238 is an high speed CMOS 3 TO 8
LINE DECODER fabricated with silicon gate2 MOS technology.
If the device is enabled, 3 binary select inputs (A,
B and C) determine which one of outputs will go
high. When enable input G1 is held "Low" or either
G2A or G2B is held "High" decoding function is
inhibited and all the 8 outputs go low. Three
enable inputs are provided to ease cascade
connection and application of this address
decoder in memory systems.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HC238

3 TO 8 LINE DECODER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
M74HC238
2/10
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE

X : Don’t Care
LOGIC DIAGRAM

This logic diagram has not be used to estimate propagation delays
M74HC238
3/10
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
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
M74HC238
4/10
DC SPECIFICATIONS
AC ELECTRICAL CHARACTERISTICS (C
L = 50 pF, Input tr = tf = 6ns)
M74HC238
5/10
CAPACITIVE CHARACTERISTICS

1) CPD 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. ICC(opr) = CPD x VCC x fIN + ICC
TEST CIRCUIT

CL = 50pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
M74HC238
6/10
WAVEFORM 1: PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)
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