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SN74ALS990

Features: • 3-State I/O-Type Read-Back Inputs• Bus-Structured Pinout• True Logic Outputs• Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPsPinoutSpecificationsSupply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . ....

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SeekIC No. : 004498205 Detail

SN74ALS990: Features: • 3-State I/O-Type Read-Back Inputs• Bus-Structured Pinout• True Logic Outputs• Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N)...

SN74ALS990 Data Sheet

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Part Number:
SN74ALS990
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

• 3-State I/O-Type Read-Back Inputs
• Bus-Structured Pinout
• True Logic Outputs
• Package Options Include Plastic
  Small-Outline (DW) Packages and Standard
  Plastic (N) 300-mil DIPs


Pinout

Connection Diagram


Specifications

Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 V
Input voltage, VI (OERB and LE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 V
Voltage applied to D inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5.5 V
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C


Description

This SN74ALS990 8-bit latch is designed specifically for storing the contents of the input data bus and providing the capability of reading back the stored data onto the input data bus.

The SN74ALS990 eight latches are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs.

Read back is provided through the output-enable (OERB) input. When OERB is taken low, the data present at the output of the data latches is allowed to pass back onto the input data bus. When OERB is taken high, the output of the data latches is isolated from the D inputs. OERB does not affect the internal operation of the latches; however, precautions should be taken not to create a bus conflict.The SN74ALS990 is characterized for operation from 0°C to 70°C.




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