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.
The MAX3243 provides three line drivers and five line receivers in a single‑chip, single‑supply package that meets TIA/EIA‑232‑F and ITU‑V.28 standards. It operates from a 3 V to 5.5 V supply, supports data rates up to 250 kbit/s, and includes an always‑active non‑inverting output for ring‑indicator applications.
Key features include +15 kV HBM ESD protection, an auto‑power‑down mode that reduces standby current to 1 µA, and flexible power‑management options via FORCEON and FORCEOFF pins. Mechanical data and packaging options are provided for PCB designers.
| Supply voltage range (VCC) | 3 V to 5.5 V |
|---|---|
| Number of drivers | 3 |
| Number of receivers | 5 |
| Maximum data rate | 250 kbit/s |
| Standby current (typical) | 1 µA |
| ESD protection (HBM) | +15 kV |
The device operates at data signaling rates up to 250 kbit/s.
It contains three line drivers and five line receivers.
It can be powered from 3 V to 5.5 V.
The standby current is reduced to about 1 µA.