MAX239ENG

Overview

The MAX239ENG is a +5V-powered, multichannel RS-232 driver and receiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a single +5V supply using internal charge-pump circuitry to generate the required ±10V levels for RS-232 communication. The device features an integrated shutdown mode that reduces power consumption to 5μW. It supports data rates up to 160kbps and includes TTL/CMOS-compatible inputs and outputs. The 'ENG' suffix indicates it is housed in a 28-pin SSOP package with an extended operating temperature range of -40°C to +85°C.

Feature Summary

• Integrated dual charge-pump DC-DC voltage converters eliminate the need for external bipolar supplies or additional components.
• Low-power shutdown mode significantly reduces current consumption for battery-operated applications.
• TTL and CMOS logic compatibility allows direct interfacing with standard microcontrollers and digital logic circuits.

Applications

• Interface translation between TTL/CMOS logic levels and RS-232 serial ports
• Multidrop RS-232 network connections
• Portable diagnostics equipment requiring low power consumption

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Confirm RoHS compliance status as specifications may vary by production batch. Ensure the component source is an authorized distributor to guarantee authenticity and traceability.

Selection Notes

Select this component when a single +5V supply is available and board space is limited due to the absence of external capacitors. Consider the propagation delay and slew rate characteristics if high-speed data transmission is required. Verify that the input/output voltage thresholds align with the connected logic family standards.

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 channel configurations and packages to suit different interface requirements while maintaining a unified architecture based on single-supply operation.

Replacement Considerations

Compatible substitutes within the same family include the MAX232A and MAX233A. These alternatives share similar electrical characteristics and pinout configurations but may differ in channel count or specific package options. Verify functional equivalence before implementation.

FAQ

Does the MAX239 require external capacitors for operation?

No, the MAX239 utilizes internal charge-pump circuitry and does not require external capacitors for generating the necessary voltage levels.

What is the maximum data rate supported by this device?

The device supports data rates up to 160kbps under normal operating conditions.

How does the shutdown feature affect the output voltages?

When the shutdown pin is activated, the transmitter outputs enter a high-impedance state, and the receiver outputs enter a low-power receive mode to minimize current draw.