SN54LS697 Synchronous Up/Down Counters With Output Registers And Multiplexed 3-State Outpu | TI.com

SN54LS697
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Synchronous Up/Down Counters With Output Registers And Multiplexed 3-State Outpu

 

Description

These low-power Schottky LSI devices incorporate synchronous up/down counters, four-bit D-type registers, and quadruple two-line to one-line multiplexers with three state outputs in a single 20-pin package. The up/down counters are programmable from the data inputs and feature enable P\ and enable T\ and a ripple-carry output for easy expansion. The register/counter select input R/C\, selects the counter when low and the register when high for the three-state outputs, QA, QB, QC, and QD. These outputs are rated at 12 and 24 milliamperes (54LS/74LS) for good bus driving performance.

Both the counter CCK and register clock RCK are positive-edge triggered. The counter clear CCLR\ is active low and is asynchronous on the 'LS696 and 'LS697, synchronous on the 'LS699. Loading of the counter is accomplished when LOAD\ is taken low and a positive transition occurs on the counter clock CCK.

Expansion is easily accomplished by connecting RCO\ of the first stage to ENT\ of the second stage, etc. All ENP\ inputs can be tied common and used as a master enable or disable control.

 

Features

  • 4-Bit Counters/Registers
  • Multiplexed Outputs for Counter or Latched Data
  • 3-State Outputs Drive Bus Lines Directly
  • 'LS696 … Decade Counter, Direct Clear'LS697…Binary Counter, Direct Clear'LS699…Binary Counter, Synchronous Clear

 

Parametrics

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Part number Order Technology Family VCC (Min) (V) VCC (Max) (V) Bits (#) Voltage (Nom) (V) F @ nom voltage (Max) (MHz) ICC @ nom voltage (Max) (mA) tpd @ nom Voltage (Max) (ns) IOL (Max) (mA) IOH (Max) (mA) Function Type Rating Operating temperature range (C) Package Group
SN54LS697 Order now LS     4.75     5.25     4     5     35     70     40     24     -2.6     Counter     Binary     Military     -55 to 125     CDIP | 20    
SN74LS697 Samples not available LS     4.75     5.25     4     5     35     70     40     24     -2.6     Counter     Binary     Catalog     0 to 70     PDIP | 20
SOIC | 20