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TC74HC4520A

DUAL 4-BIT BINARY COUNTER

Toshiba 

TC74HC4520AP/AF

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic

TC74HC4520AP,TC74HC4520AF

Dual 4-Bit Binary Counter

The TC74HC4520A is high speed CMOS DUAL BCD/4-BIT

BINARY COUNTER fabricated with silicon gate C2MOS

technology.

It achieves the high speed operation similar to equivalent

LSTTL while maintaining the CMOS low power dissipation.

Since it contains two independent counter circuits in one

package, counting or frequency division of eight binary bits can

be achieved with one device. The counter is reset to “O” (Q0 to Q3

low) by setting the CLR input high regardless of the other inputs.

Counting occurs on the positive going (rising edge) transition of

CK if CE is high or the negative going (falling edge) transition of

CK if CE is low.

All inputs are equipped with protection circuits against static

discharge or transient excess voltage.

Features

• High speed: fmax = 55 MHz (typ.) at VCC = 5 V

• Low power dissipation: ICC = 4 μA (max) at Ta = 25°C

• High noise immunity: VNIH = VNIL = 28% VCC (min)

• Outputs drive capability: 10 LSTTL loads

• Symmetrical output impedance: |IOH| = IOL = 4 mA (min)

• Balanced propagation delays: tpLH ∼− tpHL

• Wide operating voltage range: VCC (opr) = 2 to 6 V

• Pin and function compatible with TC4520B

Pin Assignment

TC74HC4520AP

TC74HC4520AF

Weight

DlP16-P-300-2.54A

SOP16-P-300-1.27A

: 1.00 g (typ.)

: 0.18 g (typ.)

1

2007-10-01

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