SCLS039C - DECEMBER 1982 - REVISED MAY 1997
Please be aware that an important notice concerningavailability, standard warranty, and use in critical applications ofTexasInstruments semiconductor products and disclaimers theretoappears at the end of this data sheet.
The 'HC590A contain an 8-bit binary counter that feeds an 8-bitstorage register. The storage register has parallel outputs. Separateclocks are provided for both the binary counter and storage register.The binary counter features direct clear (
) is providedfor cascading. Expansion is easily accomplished for two stages byconnecting of the firststage to 
of the secondstage. Cascading for larger count chains can be accomplished byconnecting of each stageto the counter clock (CCLK) input of the following stage.
Both CCLK and the register clock (RCLK) input are positive-edgetriggered. If both clocks are connected together, the counter stateis always one count ahead of the register. Internal circuitryprevents clocking from the clock enable.
The SN54HC590A is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74HC590A is characterized for operation from -40°C to85°C.
View more information about generic part numbers:SN54HC590A, SN74HC590A
Go to the Engineering Design Center to locate information on other TI Semiconductor devices.