MAX243CSE

Overview

The MAX243CSE is a dual driver and dual receiver RS-232 transceiver from the MAX220–MAX249 family, designed for EIA/TIA-232E and V.28/V.24 interfaces. It operates on a single +5V supply using an integrated charge pump to generate ±10V internally, eliminating external bipolar supplies. The device supports data rates up to 200 kbps with a typical propagation delay of 3.5 µs for drivers and 1 µs for receivers. It features a 16-pin SOIC-Wide package, operates within a commercial temperature range of 0°C to +70°C, and draws 10 mA during normal operation.

Feature Summary

• Integrated charge pump circuitry enables single-supply +5V operation without requiring external bipolar voltage sources.
• Dual drivers and dual receivers provide complete RS-232 communication channels in a compact footprint.
• Receiver outputs are guaranteed low when inputs are unconnected or at logic high, preventing false triggering.

Applications

• Interface translation between TTL/CMOS logic and RS-232 serial ports
• Multidrop RS-232 network connections
• Portable diagnostic equipment

Procurement Notes

Verify the specific suffix 'CSE' against official documentation to confirm the 16-pin SOIC-Wide package and 0°C to +70°C operating temperature range. Confirm RoHS compliance status through manufacturer declarations. Ensure the component matches the exact pinout and electrical specifications required by the design.

Selection Notes

Select this part for applications requiring two independent RS-232 channels powered by a single +5V rail. Verify that the 200 kbps data rate meets system requirements. Consider the 16-pin SOIC-Wide package dimensions for PCB layout constraints. Check if the lack of shutdown control pins aligns with power management needs.

Part Context

The MAX243 belongs to the MAX220–MAX249 family of +5V-powered multichannel RS-232 drivers and receivers. This series provides various channel configurations and package options to accommodate different interface density and space requirements while maintaining compatibility with standard RS-232 protocols.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified source material.

FAQ

What is the input threshold behavior for the MAX243 receiver?

Unlike other devices in the family, the MAX243 R2IN has a negative input threshold range (-3V to -0.1V) for logic-high detection, ensuring the output remains low when the input is unconnected or at positive voltages.

Does the MAX243 support a shutdown mode?

No, the MAX243 does not include a shutdown (SHDN) pin or low-power mode functionality; it operates continuously once powered.

How does the MAX243 generate RS-232 voltage levels?

It uses internal dual charge-pump DC-DC converters to step up the +5V supply to approximately +10V and invert it to -10V, driving the RS-232 outputs without external capacitors for voltage generation.