DS3487M

Overview

The DS3487M is a quad TRI-STATE line driver compliant with EIA RS-422 standards. It features four independent drivers with TTL-compatible inputs and outputs that enter a high-impedance state when the control pin is low. The device operates on a single 5V supply (4.75V to 5.25V) within a commercial temperature range of 0°C to +70°C. Key electrical parameters include a typical propagation delay of 10 ns, output rise/fall times under 15 ns, and an active power supply current of 80 mA maximum. The component is available in SOIC packages.

Feature Summary

• Four independent TRI-STATE differential drivers for balanced voltage digital interfaces
• TTL-compatible input buffering minimizes loading effects across logic states
• Fast switching performance with propagation delays typically at 10 ns
• Pin-compatible design facilitating direct replacement for legacy components

Applications

• Balanced voltage digital interface circuits requiring RS-422 compliance
• Industrial communication systems utilizing differential signaling
• Data transmission lines requiring TRI-STATE bus isolation capabilities

Procurement Notes

Verify the specific package variant against the datasheet, as the base model number corresponds to multiple physical form factors including SOIC. Confirm the lifecycle status, as certain suffixes indicate lifetime-buy periods or discontinuation. Ensure the selected part meets the required operating temperature range and voltage specifications for the target application environment before finalizing orders.

Selection Notes

Select this component when designing systems requiring four independent RS-422 drivers with TRI-STATE functionality. Verify that the system voltage remains within the 4.75V to 5.25V range to ensure proper operation. Consider the thermal dissipation requirements if operating near the upper temperature limits, as power derating applies above 25°C. Ensure input signals meet the specified TTL compatibility thresholds.

Part Context

The DS3487 belongs to Texas Instruments' family of RS-422 interface integrated circuits. It serves as the driver counterpart to receiver devices like the MC3486. The component is designed for robust data transmission over balanced lines, offering high noise immunity through differential signaling. Its architecture supports complex bus topologies common in industrial and telecommunications equipment.

Replacement Considerations

The datasheet explicitly identifies the DS8924 and MC3487 as pin-compatible replacements. Designers should verify that substitute components maintain identical electrical characteristics, particularly propagation delay and output drive strength, to ensure signal integrity is preserved in existing circuit layouts.