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M74HC148OKIN/a23avai8 TO 3 LINE PRIORITY ENCODER


M74HC148 ,8 TO 3 LINE PRIORITY ENCODERM74HC1488 TO 3 LINE PRIORITY ENCODER ■ HIGH SPEED: t = 16ns (TYP.) at V = 6VPD CC■ LOW POWER DISSI ..
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M74HC148
8 TO 3 LINE PRIORITY ENCODER
1/11July 2001 HIGH SPEED:
tPD = 16ns (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 148
DESCRIPTION

The M74HC148 is an high speed CMOS 8 TO 3
LINE PRIORITY ENCODER fabricated with
silicon gate C2 MOS technology.
The M74HC148 encodes eight data lines to
three-line (4-2-1) binary (octal). Cascading
circuitry (enable input EI and enable output EO)
has been provided to allow octal expansion
without the need for external circuitry. Data inputs
are active at the low logic level.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HC148

8 TO 3 LINE PRIORITY ENCODER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
M74HC148
2/11
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
M74HC148
3/11
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
M74HC148
4/11
DC SPECIFICATIONS
M74HC148
5/11
AC ELECTRICAL CHARACTERISTICS (C
L = 50 pF, Input tr = tf = 6ns)
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
M74HC148
6/11
TEST CIRCUIT

CL = 50pF or equivalent (includes jig and probe capacitance)
RT = ZOUT of pulse generator (typically 50Ω)
WAVEFORM 1: PROPAGATION DELAY TIMES ,FOR INVERTING AND NON INVERTING OUTPUTS

(f=1MHz; 50% duty cycle)
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