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74LS161 - Synchronous 4-Bit Binary Counters

General Description

These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs.

The DM74LS161A and DM74LS163A are 4-bit binary counters.

Key Features

  • s Synchronously programmable s Internal look-ahead for fast counting s Carry output for n-bit cascading s Synchronous counting s Load control line s Diode-clamped inputs s Typical propagation time, clock to Q output 14 ns s Typical clock frequency 32 MHz s Typical power dissipation 93 mW Ordering Code: Order Number DM74LS161AM DM74LS161AN DM74LS163AM DM74LS163AN Package Number M16A N16E M16A N16E Package.

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Other Datasheets by Fairchild (now onsemi)

Part Number Description
74LS161A Synchronous 4-Bit Binary Counters
74LS163 Synchronous 4-Bit Binary Counters
74LS163A Synchronous 4-Bit Binary Counters
74LS164 8-Bit Serial In/Parallel Out Shift Register
74LS165 8-Bit Parallel In/Serial Output Shift Registers

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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DM74LS161A • DM74LS163A Synchronous 4-Bit Binary Counters August 1986 Revised April 2000 DM74LS161A • DM74LS163A Synchronous 4-Bit Binary Counters General Description These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. The DM74LS161A and DM74LS163A are 4-bit binary counters. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating.