DM7490AN

Counter Dividers Overview

The DM7490AN is a monolithic binary/decade counter in a 14-lead PDIP package. It contains four master-slave flip-flops providing divide-by-two and divide-by-five counters. Recommended operating conditions specify a supply voltage of 4.75 V to 5.25 V and an operating temperature range of 0°C to 70°C. The maximum clock frequency is 32 MHz for input A and 16 MHz for input B. Propagation delays from input A to outputs QA and QD are 16 ns and 48 ns respectively.

Counter Dividers Feature Summary

• Contains four master-slave flip-flops configured as a divide-by-two and a three-stage divide-by-five counter
• Includes gated zero reset and gated set-to-nine inputs for BCD nine's complement applications
• Capable of symmetrical divide-by-ten count when the B input is connected to the QA output

Counter Dividers Applications

• BCD counting sequences
• Bi-quinary (5-2) counting systems
• Divide-by-ten square wave generation

Counter Dividers Procurement Notes

Verify component authenticity through authorized channels, as the DM7490AN is listed as obsolete by onsemi. Confirm that the specific lot matches the original Fairchild Semiconductor manufacturing specifications. Ensure the 14-MDIP package variant aligns with existing board layouts. Review current lifecycle status before initiating new designs due to potential availability constraints.

Counter Dividers Selection Notes

Select this component for legacy designs requiring a single-chip decade or binary counter solution. Verify compatibility with standard TTL logic levels and power supplies. Consider the physical dimensions of the 14-DIP package during PCB layout. Evaluate system requirements against the specified 32 MHz maximum clock frequency limit for input A.

Counter Dividers Part Context

This device belongs to the 7400 series of standard logic integrated circuits. Originally manufactured by Fairchild Semiconductor, production rights were transferred to onsemi. The DM7490A serves as a fundamental building block for digital timing and sequencing applications within industrial and consumer electronics systems utilizing discrete logic families.

Counter Dividers Replacement Considerations

Check for direct pin-compatible equivalents such as the DM7490N. Verify functional equivalence regarding reset and set-to-nine gating configurations. Ensure replacement parts meet the same electrical characteristics and package specifications.