User Manual
The MAX3243 is a single-chip single-supply interface that can be used for IBM PC/AT serial ports, meets or exceeds the requirements of TIA/EIA-232-F and ITU v.28 standards, operates with a power supply of 3-V to 5.5-V VCC, has 3 drivers and 5 receivers, supports a data transfer rate of 250 kbit/s, has a low standby current of 1 µA, has external capacitors of 4 × 0.1 µF, can accept 5-V logic input with a 3.3-V supply, has an always-active non-inverting receiver output (ROUT2B), supports an alternative high-speed pin-compatible device (1 Mbit/s) – SNx5C3243, supports serial mouse driveability, and has an auto-powerdown feature that disables driver outputs when no valid RS-232 signal is sensed.
User Manual
MAX3243 is a 3-V to 5.5-V multichannel RS-232 line driver/receiver for the single-chip and single-supply interface for the IBM PC/AT serial port. It meets or exceeds the requirements of TIA/EIA-232-F and ITU v.28 standards and operates with a 3-V to 5.5-V VCC supply. The device consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin-to-pin. It provides the electrical interface between an asynchronous communication controller and the serial-port connector. This combination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, or compatible. The device has RS-232 bus-pin ESD protection that exceeds ±15-kV using the human-body model (HBM). It is suitable for battery-powered systems, PDAs, notebooks, laptops, palmtop PCs, and hand-held equipment.
