DS3695ATM

Overview

The DS3695ATM is a multipoint RS-485/RS-422 transceiver manufactured by Texas Instruments. It operates on a single +5V supply with a voltage range of 4.75V to 5.25V. The device features one driver and one receiver, supporting half-duplex communication at data rates up to 10 Mb/s. It provides a bus common mode range of -7V to +12V, allowing for ±7V ground differences between devices. Key electrical parameters include a typical driver propagation delay of 15 ns with 2 ns skew, a receiver hysteresis of 70 mV, and a supply current of 60 mA maximum. It is housed in an SOIC-8 package.

Feature Summary

• Meets EIA standard RS-485 requirements with extended common mode range from -7V to +12V.
• Features thermal shutdown protection that forces driver outputs into a high-impedance state during excessive power dissipation.
• Provides tri-state capability for both driver and receiver outputs across the entire common mode range.
• High impedance to the bus when the driver is tri-stated or power is off, allowing unused devices to be powered down.

Applications

• Multipoint bus transmission systems requiring RS-485 compliance.
• Industrial control networks where ground potential differences exist between devices.
• Communication interfaces utilizing RS-422 standards for point-to-point or multipoint connections.

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix 'A' indicates the commercial temperature range (0°C to 70°C) and 'TM' denotes the surface-mount SOIC-8 package. Check for RoHS compliance status as indicated in the packaging information addendum. Ensure the source documentation matches the SNLS072C datasheet revision C for accurate specifications.

Selection Notes

Select this component for applications requiring a single differential channel with high-speed performance up to 10 Mb/s. Consider the commercial temperature range limits when designing for environments outside 0°C to 70°C; use the DS3695T variant for industrial ranges (-40°C to 85°C). Evaluate the need for thermal shutdown reporting if system diagnostics are required, noting that the TS pin serves this function on compatible variants.

Part Context

The DS3695ATM belongs to the DS3695 family of multipoint transceivers, which also includes the DS3696 repeater and DS3697 line driver/receiver. These devices share similar electrical characteristics and interface standards but differ in functionality and pin configurations. The family is designed to facilitate robust communication in noisy industrial environments using differential signaling techniques.

Replacement Considerations

The DS3695TN/NOPB is a verified alternative offering the same functionality within an extended industrial temperature range (-40°C to 85°C). Both parts utilize the PDIP package in their base forms, but the ATM suffix specifically refers to the SOIC-8 surface mount option. Verify package compatibility and thermal management requirements when substituting.

FAQ

What is the purpose of the TS pin on the DS3695?

The TS pin is an open-collector output with an internal 10 kΩ pull-up resistor that reports the occurrence of thermal shutdown. It goes low when the device's thermal protection circuit activates due to excessive power dissipation.

How does the DS3695 handle ground differences between devices?

The device supports a bus common mode range of -7V to +12V. This specification permits up to a ±7V ground difference between any two devices connected on the bus without causing communication errors or damage.

What is the typical receiver input hysteresis value?

The DS3695 features a typical receiver hysteresis of 70 mV. This helps improve noise immunity on the bus lines by preventing false triggering due to signal fluctuations near the threshold voltage.