MAX3320BCAP+T

Overview

The MAX3320BCAP+T is a true RS-232 transceiver with an integrated power-on reset circuit, operating from a +3V to +5.5V supply. It features two drivers and two receivers supporting data rates up to 250kbps. The device utilizes AutoShutdown Plus technology to achieve a low-power shutdown mode with a typical supply current of 4µA when inputs are inactive for 30 seconds. It includes a dual charge pump requiring only four 0.1µF capacitors. The RESET output threshold is set at 2.85V (suffix B), providing a minimum pulse width of 100ms. It is housed in a 20-pin SSOP package.

Feature Summary

• Integrates a microprocessor supervisory circuit that asserts a reset signal when the VCC supply voltage declines below a preset threshold.
• Features proprietary low-dropout transmitter output stage enabling true RS-232 performance with minimal external components.
• AutoShutdown Plus functionality automatically reduces supply current to 4µA when no valid signal levels are detected on inputs for 30 seconds.

Applications

• Palmtop Computers
• Portable/Battery-Powered Equipment
• Hand-Held Equipment

Procurement Notes

Verify the specific suffix 'B' corresponds to the required 2.85V reset threshold before procurement. Confirm the '+T' designation indicates tape-and-reel packaging if reel quantity is required. Ensure the component meets RoHS compliance standards as indicated by the '+' suffix. Cross-reference the manufacturer's latest documentation for any updates to the ordering information or pin configuration.

Selection Notes

Select this component when a combined RS-232 interface and power-supply monitoring solution is needed for battery-operated systems. The 2.85V reset threshold is suitable for 3.3V logic systems. Consider the 4µA shutdown current for applications requiring extended standby times. Verify that the 250kbps maximum data rate meets the system communication requirements.

Part Context

The MAX3320BCAP+T belongs to the MAX3320A/B/L/T family of RS-232 transceivers. These devices share identical electrical characteristics and pinouts but differ in the internal reset comparator threshold voltage. The 'B' suffix specifically designates the 2.85V threshold variant within this series.

Replacement Considerations

Direct functional replacements within the same family include MAX3320ACAP+T, MAX3320LCAP+T, and MAX3320TCAP+T, which offer different reset thresholds. Non-integrated RS-232 transceivers like the MAX3232 require additional external reset circuitry and do not provide the same low-power shutdown capabilities.