SNJ54HC645FK

$29.14

Description：54HC645 OCTAL BUS TRANSCEIVERS W
Series：*
Mfr：Texas Instruments
Package：Bulk

SKU:bfed33ac0d55 Category: Buffers, Drivers, Receivers, Transceivers Brand: Texas Instruments

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Product introduction

Product Detailed Parameters

Description：54HC645 OCTAL BUS TRANSCEIVERS W
Series：*
Mfr：Texas Instruments
Package：Bulk
Logic Type：-
Number of Elements：-
Number of Bits per Element：-
Input Type：-
Output Type：-
Current - Output High, Low：-
Voltage - Supply：-
Operating Temperature：-
Mounting Type：-
Package / Case：-
Supplier Device Package：-
Grade：-
Qualification：-

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SNJ54HC645FK

Overview

The SNJ54HC645FK is an octal bus transceiver from the Texas Instruments HC series, designed for asynchronous two-way communication between data buses. It features a 20-pin LCCC package and operates within a supply voltage range of 2 V to 6 V. The device provides non-inverting transmission with direction control (DIR) and output enable (OE) inputs. It supports high-current 3-state outputs capable of driving up to 15 LSTTL loads, with typical propagation delay of 12 ns at 5 V.

Feature Summary

Octal bidirectional bus transceiver architecture
High-current 3-state CMOS outputs
Direction control and isolation capability

Applications

Asynchronous two-way communication between data buses
Memory and memory mapping applications
Signal buffering and level shifting

Procurement Notes

Verify the specific ordering suffix FK corresponds to the Leadless Ceramic Chip Carrier (LCCC) package configuration. Confirm that the military-grade SN54HC variant meets the required environmental specifications for the intended application. Ensure compatibility with existing PCB footprints designed for the 20-pin LCCC form factor before finalizing procurement.

Selection Notes

Select this component when high-density packaging and wide temperature operation are required. The LCCC package offers robust performance in harsh environments compared to standard plastic packages. Consider the HC logic family characteristics regarding power consumption and speed relative to other available bus transceivers in the product line.

Part Context

This part belongs to the SN54HC645 family, which includes variants in CDIP, CFP, and LCCC packages. The SN54 designation indicates military-grade qualification, supporting an extended operating temperature range of -55°C to 125°C. It is functionally equivalent to the commercial SN74HC645 but with stricter reliability standards.

Replacement Considerations

SNJ54HC645J

FAQ

What is the function of the DIR input?

The DIR input controls the direction of data flow. A low level directs data from the A bus to the B bus, while a high level directs data from the B bus to the A bus.