SN54ALS299, SN74ALS299 8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH 3-STATE OUTPUTS

SDAS220B - 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
Direct Overriding 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 multiplexedI/O ports to achieve full 8-bit data handling in a single 20-pinpackage. Two function-select (S0, S1) inputs and two output- enable (, OE2\) inputs can be used to choose the modes of operationlisted 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 asynchronously whenthe clear () input is low.Taking either OE1\ or OE2\ high disables the outputs, but has noeffect on clearing, shifting, or storing data.

The SN54ALS299 is characterized for operation over the fullmilitary temperature range of -55°C to 125°C. TheSN74ALS299 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.

Title: 8-BIT UNIVERSAL SHIFT/STORAGE REGISTERS WITH 3-STATE OUTPUTS
Product Family: SHIFT REGISTERS
Device Functionality: SHIFT REGISTERS
Orderable Devices: SN54ALS299J, SNJ54ALS299FK, SNJ54ALS299J, SNJ54ALS299W, SN74ALS299DW, SN74ALS299DWR, SN74ALS299N

View the complete PDF datasheet: sdas220b.pdf (113 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN54ALS299, SN74ALS299

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