MAX3320TEAP+T

Overview

The MAX3320TEAP+T is a true RS-232 transceiver with an integrated power-on reset circuit, operating from a +3V to +5.5V supply. It features AutoShutdown Plus technology, achieving a typical shutdown supply current of 4µA after 30 seconds of inactivity. The device supports data rates up to 250kbps and includes two drivers and two receivers. The 'T' suffix indicates a reset threshold voltage of 3.08V (typical). It utilizes a dual charge pump requiring four external capacitors and is housed in a 20-pin SSOP package.

Feature Summary

• Integrates a microprocessor supervisory circuit that asserts a reset signal when VCC drops below the preset threshold
• AutoShutdown Plus feature reduces supply current to 4µA during periods of no activity
• Proprietary low-dropout transmitter output stage enables true RS-232 performance on single supplies
• Receivers remain active while transmitters are shut down to detect wake-up signals

Applications

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

Procurement Notes

Verify the specific reset threshold voltage required for the target application before procurement. The 'T' suffix corresponds to a 3.08V threshold. Confirm that the 20-pin SSOP package dimensions match the PCB footprint requirements. Ensure the design accommodates the necessary external charge-pump capacitors as specified in the datasheet.

Selection Notes

Select this component when a combined RS-232 interface and power supervision function is needed in space-constrained designs. The 3.08V reset threshold is suitable for systems powered by 3.3V logic. Consider the 4µA shutdown current for battery-operated applications where standby power consumption is critical. Verify compatibility with the host system's logic voltage levels.

Part Context

The MAX3320 belongs to the MAX3320A/B/L/T family of RS-232 transceivers. The variants differ primarily in the reset threshold voltage: A (4.25V), B (2.85V), L (4.63V), and T (3.08V). All share the same transceiver functionality, pinout, and electrical characteristics regarding data rate and supply current.

Replacement Considerations

Direct functional replacements within the same family include MAX3320ACAP+, MAX3320BCAP+, and MAX3320LCAP+. These parts offer identical transceiver performance but feature different reset thresholds. Ensure the replacement part's reset threshold matches the original design requirements.