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M74HC4520M1R
DUAL 4 BIT BINARY COUNTER
1/12July 2001 HIGH SPEED :
fMAX = 60 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:
tPLH ≅ tPHL WIDE OPERATING VOLTAGE RANGE:
VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 4520
DESCRIPTIONThe M74HC4520 is an high speed CMOS DUAL
BINARY COUNTER fabricated with silicon gate2 MOS technology.
It consists of two identical internally synchronous
4-stage counters. The counter stages are D-TYPE
flip-flops having interchangeable CLOCK and
ENABLE inputs for incrementing on either the
positive-going or negative-going transition.
For single-unit operation the ENABLE input is
maintained "high" and the counter advances on
each positive-going transition of the CLOCK. The
counters are cleared by high levels on their clear
lines.
The counter can be cascaded in the ripple mode
by connecting Q4 to the enable input of the
subsequent counter while the clock input of the
latter is held permanently low.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
M74HC4520DUAL 4 BIT BINARY COUNTER
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
M74HC45202/12
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
TRUTH TABLE X : Don’t Care
Z : High Impedance
M74HC4520
LOGIC DIAGRAM This logic diagram has not be used to estimate propagation delays
TIMING CHART
M74HC45204/12
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
M74HC45205/12
DC SPECIFICATIONS
M74HC45206/12
AC ELECTRICAL CHARACTERISTICS (CL = 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/2 (per
COUNTER)
