MAX3318EIDBG4

Overview

The MAX3318EIDBG4 is a dual-driver, dual-receiver RS-232 transceiver manufactured by Texas Instruments. It operates from a single 2.25-V to 3-V supply and supports data rates up to 460 kbps. The device integrates a charge pump requiring only four 0.1-μF capacitors. It features ±15-kV ESD protection on RS-232 I/O pins using the IEC 61000-4-2 Air-Gap Discharge method, ±8-kV Contact Discharge protection, and ±15-kV Human-Body Model protection. Supply current is 300 μA in normal operation and reduces to 1 μA in low-power standby mode with receivers active. The component is housed in a 20-pin SSOP package.

Feature Summary

• Integrated auto-power-down plus feature reduces supply current to 1 μA when drivers are inactive for approximately 30 seconds.
• Robust electrostatic discharge (ESD) protection rated at ±15 kV (Air-Gap), ±8 kV (Contact), and ±15 kV (HBM) on RS-232 pins.
• Proprietary low-dropout driver output stage enables RS-232-compatible operation from a 2.25-V to 3-V supply.
• Flexible power management control via FORCEON and FORCEOFF inputs to override or enable auto-power-down modes.

Applications

• Battery-powered portable systems
• Personal Digital Assistants (PDAs)
• Cellular phones
• Notebook computers
• Hand-held equipment

Procurement Notes

Verify the specific ordering suffix 'G4' against the latest Package Option Addendum to confirm lead finish and RoHS compliance status. Ensure the selected package variant matches the required thermal and mechanical constraints for the target PCB layout. Cross-reference the active production status with current distributor availability to confirm supply chain continuity.

Selection Notes

Select this component for applications requiring low-voltage operation between 2.25 V and 3 V with minimal external capacitor count. The integrated ESD protection eliminates the need for external protection devices on serial ports. Consider the 20-pin SSOP footprint for space-constrained designs where auto-power-down functionality is critical for extending battery life in idle states.

Part Context

The MAX3318E belongs to the Maxim Integrated RS-232 transceiver family, now under Texas Instruments following acquisition. This series focuses on low-power, single-supply communication interfaces for mobile and handheld electronics. The device replaces older multi-supply RS-232 solutions by integrating charge pumps and voltage regulation directly onto the silicon die.

Replacement Considerations

MAX3318EIDBR

FAQ

How does the auto-power-down plus feature function?

When FORCEON is low and FORCEOFF is high, the device monitors receiver and driver inputs. If no valid signal transitions occur for approximately 30 seconds, the charge pump and drivers power down, reducing supply current to 1 μA. The device reactivates upon detecting a valid signal edge.

What is the maximum data rate supported by the MAX3318E?

The device supports a maximum data rate of 460 kbps while maintaining RS-232 compatibility across the full operating temperature range.

What external components are required for the charge pump?

The charge pump requires only four 0.1-μF capacitors connected to the C1+, C1-, C2+, and C2- pins to generate the necessary positive and negative voltages for RS-232 signaling.