SNJ54ALS640BW

$25.79

Description：BUS TRANSCEIVER, ALS SERIES
Series：*
Mfr：Texas Instruments
Package：Bulk

SKU:c2ce15849066 Category: Buffers, Drivers, Receivers, Transceivers Brand: Texas Instruments

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Product introduction

Product Detailed Parameters

Description：BUS TRANSCEIVER, ALS SERIES
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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SNJ54ALS640BW

Overview

The SNJ54ALS640BW is an octal bus transceiver from the Texas Instruments SN54ALS640B series, designed for high-speed bidirectional data transfer. It features eight independent channels with three-state outputs and inverting polarity. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL input and output levels. Key electrical parameters include a propagation delay of 11 ns, a low-level output current of 24 mA, and a high-level output current of -15 mA. It is housed in a 20-pin ceramic dual in-line package (CDIP) and functions reliably across an extended military temperature range of -55°C to +125°C.

Feature Summary

Octal Bus Transceiver
Three-State Outputs
Inverting Polarity
Bidirectional Data Transfer

Applications

Military-grade data bus systems
High-speed memory interface circuits
Control logic signal routing
Industrial instrumentation data acquisition

Procurement Notes

Verify the specific suffix 'BW' indicates the ceramic dual in-line package (CDIP) variant, distinct from plastic SOIC or tape-and-reel options. Confirm RoHS compliance status as military-grade ceramic packages may have different regulatory classifications than commercial equivalents. Check lead times carefully, as ceramic DIP components often involve longer manufacturing cycles compared to standard surface-mount devices. Ensure the ordering part number matches the required pin configuration and material specifications for your PCB design.

Selection Notes

Select this component when designing for environments requiring extended temperature stability and robust physical packaging. The ALS logic family offers faster switching speeds than standard LS counterparts while maintaining lower power consumption. Verify that the system's I/O requirements align with the specified 24 mA sink and 15 mA source capabilities. Consider the 20-pin CDIP footprint during layout planning, ensuring adequate clearance for through-hole mounting processes.

Part Context

This part belongs to the SN54/74ALS640(B) family of octal bus transceivers. The SN54 prefix denotes military-grade qualification, supporting operation from -55°C to +125°C, whereas the SN74 series is limited to commercial temperatures. The 'ALS' suffix identifies the Advanced Low-power Schottky logic technology, providing improved speed and power efficiency over earlier generations.

Replacement Considerations

SNJ54ALS640BJ: Identical functional specification in a different ceramic package variant.

FAQ

What is the difference between SN54 and SN74 prefixes?

The SN54 prefix indicates military-grade qualification with an extended operating temperature range of -55°C to +125°C, while SN74 is commercial grade limited to 0°C to +70°C.