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M74HC390M1RSTN/a754avaiDUAL DECADE COUNTER
M74HC390RM13TRSTN/a2500avaiDUAL DECADE COUNTER


M74HC390RM13TR ,DUAL DECADE COUNTERlogic diagram has not be used to estimate propagation delays3/12M74HC390TIMING CHART
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M74HC390M1R-M74HC390RM13TR
DUAL DECADE COUNTER
1/12July 2001 HIGH SPEED :
fMAX = 79 MHz (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 390
DESCRIPTION

The M74HC390 is an high speed CMOS DUAL
DECADE COUNTER fabricated with silicon gate2 MOS technology.
This dual decade counter contains two
independent ripple carry counters. Each counter is
composed of a divide by two and divide by five
counter. The divide by two and divide by five
counters can be cascaded to form dual decade,
dual biquinary, or various combination up to a
single divide by 100 counter.
Each 4-bit counter is incremented on the high to
low transition (negative edge) of the clock input,
and each has an independent clear input. When
clear is set low all four bits of each counter are set
to low. This enables count truncation and allows
the implementation of divide by N counter
configuration.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HC390

DUAL DECADE COUNTER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
M74HC390
2/12
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE

* : Output QA is connected to input CLOCK B for BCD count.
** : Output QD is connected to input CLOCK A for bi-quinary count.
M74HC390
3/12
BLOCK DIAGRAM
LOGIC DIAGRAM

This logic diagram has not be used to estimate propagation delays
M74HC390
4/12
TIMING CHART
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
M74HC390
5/12
RECOMMENDED OPERATING CONDITIONS
DC SPECIFICATIONS
M74HC390
6/12
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
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