JM38510/32803BSA

Overview

The JM38510/32803BSA is an octal bus transceiver with 3-state outputs manufactured by Texas Instruments. It utilizes Schottky transistor logic to facilitate asynchronous two-way communication between data buses. The device features a 20-pin Ceramic Flatpack (CFP) package and operates within a temperature range of -55 °C to 125 °C. It supports bidirectional data transmission controlled by a direction input and includes an active-low output enable for bus isolation.

Feature Summary

• Provides three-state outputs capable of driving bus lines directly
• Incorporates PNP inputs to reduce DC loading on bus lines
• Features built-in hysteresis at bus inputs to improve noise margins

Applications

• Building automation systems
• Electronic point of sale terminals
• Factory automation and control networks
• Test and measurement equipment

Procurement Notes

Verify the component meets MIL-PRF-38535 requirements, as parameters are tested unless otherwise noted. Confirm the specific ordering suffix matches the required ceramic flatpack package configuration. Ensure compatibility with the specified operating temperature range and supply voltage limits before integration into the design.

Selection Notes

Select this component for applications requiring robust bidirectional data transfer over ribbon cables or backplanes. The LS logic family offers high drive strength suitable for extending cable lengths. Consider the thermal resistance characteristics of the CFP package when designing heat dissipation strategies for enclosed environments.

Part Context

This part belongs to the SNx4LS245 family of octal bus transceivers. It shares functional similarities with commercial variants but adheres to military-grade specifications. The device provides standard '245 logic functionality with a common pinout and direction select pin, ensuring interchangeability within compatible system architectures.

Replacement Considerations

JM38510/32803BRA

FAQ

How does the device isolate the A and B buses?

Setting the output-enable (OE) input HIGH places all outputs in a high-impedance state, effectively isolating the A and B sides of the device from one another.

What determines the direction of data transmission?

The direction-control (DIR) input determines the signal path. A LOW level directs data from the B bus to the A bus, while a HIGH level directs data from the A bus to the B bus.