SN54ALS323, SN74ALS323 8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH SYNCHRONOUS CLEAR AND 3-STATE OUTPUTS

SDAS267A - DECEMBER 1982 - REVISED DECEMBER 1994

features

• Multiplexed I/O Ports Provide Improved Bit Density
• Four Modes of Operation:
  • Hold (Store)
  • Shift Right
  • Shift Left
  • Load Data
• Operate With Outputs Enabled or at High Impedance
• 3-State Outputs Drive Bus Lines Directly
• Can Be Cascaded for n-Bit Word Lengths
• Synchronous Clear
• Applications:
  • Stacked or Push-Down Registers
  • Buffer Storage
  • Accumulator Registers
• Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

description

These 8-bit universal shift/storage registers feature multiplexedinput/output (I/O) ports to achieve full 8-bit data handling in a20-pin package. Two function-select (S0, S1) inputs and twooutput-enable (, ) inputs can be used to choose themodes of operation listed in the function table.

Synchronous parallel loading is accomplished by taking both S0 andS1 high. This places the 3-state outputs in the high-impedance stateand permits data applied on the I/O ports to be clocked into theregister. Reading out of the register can be accomplished while theoutputs are enabled in any mode. Clearing occurs synchronously whenthe clear () input is low.Taking eitheror high disables the outputs but hasno effect on clearing, shifting, or storing data.

The SN54ALS323 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ALS323 is characterized for operation from 0°C to 70°C.

NOTE: a...h = the level of the steady-state input at inputsA through H, respectively. This data is loaded into the flip-flopswhile the flip-flop outputs are isolated from the I/Oterminals.

When one or both output-enable inputs are high, the eightI/O terminals are disabled to the high-impedance state; however,sequential operation or clearing of the register is notaffected.

View more information about generic part numbers:SN54ALS323, SN74ALS323

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