JM38510/32803BRA

Overview

The Texas Instruments JM38510/32803BRA is a military-grade octal bus transceiver utilizing Schottky transistor logic. It provides bidirectional data transmission between two 8-bit buses with three-state outputs. The device features a direction control input to select the data flow path and an active-low output enable pin for bus isolation. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an extended temperature range from -55 °C to 125 °C. The component is housed in a 20-pin ceramic dual in-line package (CDIP).

Feature Summary

• Bidirectional octal bus transceiver with three-state outputs for direct bus line driving.
• Direction control input manages data flow between A and B buses.
• Active-low output enable isolates the device from the bus when disabled.
• PNP inputs reduce DC loading on bus lines.

Applications

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

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the base part number covers multiple configurations. Confirm compliance with MIL-PRF-38535 Class B requirements if specified. Check the current production status, as certain variants may be marked as not recommended for new designs. Ensure the supplier provides traceability documentation consistent with military grade specifications.

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 heavy bus loads. Consider the CDIP package for through-hole mounting in rugged environments. Verify that the operating temperature range meets the environmental constraints of the final assembly.

Part Context

This part belongs to the SNx4LS245 family of octal bus transceivers manufactured by Texas Instruments. It is designed for asynchronous two-way communication between data buses. The device minimizes external timing requirements through its control function implementation. It serves as a standard interface component for connecting microcontrollers, FPGAs, and CPUs to peripheral devices.

Replacement Considerations

JM38510/32803BSA

FAQ

How does the device isolate the buses?

Setting the output-enable (OE) input to a high logic level disables all outputs, placing them in a high-impedance state and effectively isolating the A and B sides of the device.

What determines the direction of data transmission?

The direction-control (DIR) input determines the signal path. A low level on DIR allows data to flow from the B bus to the A bus, while a high level directs data from the A bus to the B bus.