The TC74VHC393 is an advanced high speed CMOS 4-BIT BINARY

COUNTER fabricated with silicon gate C2MOS technology.

It achieves the high speed operation similar to equivalent Bipolar Schottky

TTL while maintaining the CMOS low power dissipation.

It contains two independent counter circuits in one package, so that

counting or frequency division of eight binary bits can be achieved with one

IC.

This device changes state on the negative going transition of the CLOCK

pulse. The counter can be reset to “0” (QA to QD = “L”) by a high at the

CLEAR input regardless of other inputs.

An input protection circuit ensures that 0 to 5.5 V can be applied to the

input pins without regard to the supply voltage. This device can be used to

interface 5 V to 3 V systems and two supply systems such as battery back

up. This circuit prevents device destruction due to mismatched supply and

input voltages.

Features

 High speed: fmax = 170 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)

 Power down protection is provided on all inputs.

 Balanced propagation delays: tpLH ∼− tpHL

 Wide operating voltage range: VCC (opr) = 2 to 5.5 V

 Low noise: VOLP = 0.8 V (max)

 Pin and function compatible with 74ALS393