MAX239CNG

Overview

The MAX239CNG+ is a +5V-powered, multichannel RS-232 driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates within a temperature range of 0°C to +70°C and utilizes a 24-pin Narrow Plastic DIP package. The device integrates dual charge-pump DC-DC voltage converters that generate internal ±10V rails from a single +5V supply, eliminating the need for external bipolar power sources. It features four drivers and three receivers with full-duplex communication capability. The component supports data rates up to 64 kbps and includes enable control inputs for managing transmitter and receiver states.

Feature Summary

• Integrates dual charge-pump circuits to generate internal ±10V operation from a single +5V supply
• Provides four RS-232 drivers and three RS-232 receivers for full-duplex communication
• Includes dedicated enable control inputs for selective activation of transmitters and receivers

Applications

• Interface translation between TTL/CMOS logic and RS-232 standards
• Multidrop RS-232 network connections
• Portable diagnostic equipment requiring low-power serial communication

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature rating. Confirm RoHS compliance status through manufacturer datasheets or authorized distributors. Ensure the component matches the required pinout and electrical specifications for the target application before procurement.

Selection Notes

Select this component when designing systems that require multiple RS-232 channels without access to negative voltage supplies. Verify that the required data rate does not exceed 64 kbps under the intended load conditions. Ensure the design accommodates the necessary external capacitors for the integrated charge pumps if using variants that do not include them internally.

Part Context

This part belongs to the MAX220–MAX249 family of line drivers and receivers designed for EIA/TIA-232E and V.28/V.24 interfaces. The family offers various configurations of drivers and receivers in different packages. The MAX239 specifically provides a combination of four drivers and three receivers suitable for complex serial interface requirements.

Replacement Considerations

Compatible substitutes within the same family include the MAX231CNG+, which shares similar electrical characteristics and pinout compatibility. Verify functional equivalence regarding driver/receiver counts and control logic before substitution.