SN74ALS621A

Name: SN74ALS621A
Brand: TI
SKU: SN74ALS621A
Price: 2.229 USD

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数据表

document-pdfAcrobat Octal Bus Transceivers 数据表 (Rev. A) (英语)

SN74ALS621A

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数据表

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Supply voltage (min) (V)

4.5

Supply voltage (max) (V)

5.5

Number of channels

8

IOL (max) (mA)

24

IOH (max) (mA)

-15

Input type

TTL

Output type

TTL

Features

High speed (tpd 10-50ns), Over-voltage tolerant inputs

Technology family

ALS

Rating

Catalog

Operating temperature range (°C)

0 to 70

Supply voltage (min) (V)

4.5

Supply voltage (max) (V)

5.5

Number of channels

8

IOL (max) (mA)

24

IOH (max) (mA)

-15

Input type

TTL

Output type

TTL

Features

High speed (tpd 10-50ns), Over-voltage tolerant inputs

Technology family

ALS

Rating

Catalog

Operating temperature range (°C)

0 to 70

PDIP (N)

20

228.702 mm² 24.33 x 9.4

SOIC (DW)

20

131.84 mm² 12.8 x 10.3

Local Bus-Latch Capability
Choice of True or Inverting Logic
Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs

Local Bus-Latch Capability
Choice of True or Inverting Logic
Package Options Include Plastic Small-Outline (DW) Packages and Standard Plastic (N) 300-mil DIPs

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation allows for maximum flexibility in timing.

These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending upon the logic levels at the output-enable (OEAB and ) inputs.

The output-enable inputs disable the device so that the buses are effectively isolated. The dual-enable configuration gives the transceivers the capability to store data by simultaneously enabling OEAB and . Each output reinforces its input in this transceiver configuration. When both OEAB and are enabled and all other data sources to the two sets of bus lines are in the high-impedance state, both sets of bus lines (16 total) remain at their last states. The 8-bit codes appearing on the two sets of buses are identical for the SN74ALS621A, SN74ALS623A, and SN74AS623 or complementary for the SN74ALS620A.

The -1 versions of the SN74ALS620A and SN74ALS621A are identical to the standard versions, except that the recommended maximum I_OL is increased to 48 mA in the -1 versions.

The SN74ALS620A, SN74ALS621A, SN74ALS623A, and SN74AS623 are characterized for operation from 0°C to 70°C.

These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control-function implementation allows for maximum flexibility in timing.

These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending upon the logic levels at the output-enable (OEAB and ) inputs.

The output-enable inputs disable the device so that the buses are effectively isolated. The dual-enable configuration gives the transceivers the capability to store data by simultaneously enabling OEAB and . Each output reinforces its input in this transceiver configuration. When both OEAB and are enabled and all other data sources to the two sets of bus lines are in the high-impedance state, both sets of bus lines (16 total) remain at their last states. The 8-bit codes appearing on the two sets of buses are identical for the SN74ALS621A, SN74ALS623A, and SN74AS623 or complementary for the SN74ALS620A.

The -1 versions of the SN74ALS620A and SN74ALS621A are identical to the standard versions, except that the recommended maximum I_OL is increased to 48 mA in the -1 versions.

The SN74ALS620A, SN74ALS621A, SN74ALS623A, and SN74AS623 are characterized for operation from 0°C to 70°C.

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