General Description

The MAX3320 combines a microprocessor (µP) supervisory circuit with an RS-232 transceiver. The power-on reset performs a single function: it asserts a reset signal whenever the VCC supply voltage declines below a preset threshold, staying asserted for at least 100ms after VCC rises above the reset threshold. The MAX3320 has an active-low RESET output, which is guaranteed to be in the correct state for VCC down to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds suitable for operation with a variety of supply voltages are available.

Features

♦ Precise Monitoring of 5V and 3.3V PowerSupply Voltages:

— 100ms (min) Power-On RESET Pulse Width

— Power-Supply Transient Immunity

— Guaranteed RESET Valid to VCC = 1V

♦ 4µA Supply Current Achieved with AutoShutdown Plus

♦ Receivers Always Active

♦ Power-On Reset Always Active

♦ 4µA Low-Power Shutdown

♦ 250kbps Guaranteed Data Rate

Applications

Palmtop Computers

Portable/Battery-Powered Equipment

Hand-Held Equipment

Peripherals

Printers