74LS162 DIP Synchronous 4-Bit Decade Counter With Synchronous Clear

The 74LS162 is a high speed TTL integrated circuit that functions as a synchronous 4-bit decade counter. Unlike the 74LS160, this device features a synchronous clear input, meaning the reset operation occurs only on the next positive transition of the clock pulse. This architecture is essential for fully synchronous systems where every state change, including the reset, must be aligned with the system clock to prevent timing glitches.

This IC counts in a Binary Coded Decimal sequence from 0 through 9 and is fully presettable via parallel data inputs. The carry look-ahead circuitry and two count enable inputs allow for high speed cascading into multi-decade counting arrays. Because all internal flip flops are triggered simultaneously, the outputs change state in unison, making this component ideal for high frequency digital clocks, frequency dividers, and precision timing controllers.

KEY FEATURES

• Fully synchronous operation including the clear function
• Synchronous reset ensures clean state transitions
• Internal carry look-ahead for high speed cascading
• Presettable parallel inputs for programmable start values
• Low power Schottky technology for high speed logic
• Standard 16 pin dual in line package

SPECIFICATIONS

• Supply Voltage 4.75V to 5.25V
• Operating Temperature 0 to 70 Celsius
• Logic Type TTL Low Power Schottky
• Maximum Clock Frequency 25MHz
• Typical Power Dissipation 93mW
• High Level Output Current -0.4mA
• Low Level Output Current 8mA

INTERFACES

• CLK Clock input positive edge triggered
• CLR Clear input synchronous active low
• LOAD Parallel load input active low
• ENP Count enable P input
• ENT Count enable T input for carry logic
• A B C D Parallel data inputs
• QA QB QC QD BCD counter outputs
• RCO Ripple carry output
• VCC Positive supply voltage
• GND Ground reference