MAX3221EEAE+TG1Z

Overview

The MAX3221EEAE+TG1Z is a single-driver, single-receiver RS-232 transceiver manufactured by Analog Devices Inc./Maxim Integrated. It operates from a +3.0V to +5.5V supply and supports data rates up to 250kbps. The device features an AutoShutdown function that reduces supply current to 1µA when no valid signal is detected. It includes ±15kV ESD protection on all I/O pins and utilizes a dual charge pump requiring four 0.1µF capacitors. The component is housed in a 16-pin SSOP package and is rated for an operating temperature range of -40°C to +85°C.

Feature Summary

• AutoShutdown technology automatically disables the charge pump and drivers to achieve ultra-low 1µA standby current when the RS-232 cable is disconnected or peripheral transmitters are off.
• Integrated dual charge pumps generate true RS-232 voltage levels from a single low-voltage supply using only four small external capacitors.
• Enhanced electrostatic discharge protection withstands ±15kV air-gap, ±8kV contact discharge, and ±15kV human body model events without latchup.

Applications

• Notebook, subnotebook, and palmtop computers
• Battery-powered handheld equipment and cellular phones
• Peripherals such as printers and serial mice

Procurement Notes

Verify the specific suffix TG1Z against official manufacturer documentation to confirm tape-and-reel packaging and lot traceability requirements. Ensure compatibility with RoHS3 standards and confirm the lead-free status matches project specifications before finalizing procurement orders.

Selection Notes

Select this component for space-constrained designs requiring minimal external capacitance and low power consumption. It is suitable for applications needing full-duplex communication at 250kbps with robust ESD immunity. Consider alternative pin counts if multiple transmitter or receiver channels are required.

Part Context

This part belongs to the MAX3221E/MAX3223E/MAX3243E family of 3V-powered RS-232 transceivers. While the MAX3221E provides one driver and one receiver, other family members offer increased channel counts. All variants share the same core AutoShutdown functionality and ESD protection characteristics.

Replacement Considerations

Public confirmed substitute part numbers: MAX3221ECAE+, MAX3221ECUE+, MAX3221ECTE+, MAX3221EETE+, MAX3221EEUE+. Verify package dimensions and thermal performance when substituting between SSOP, TSSOP, and TQFN formats.

FAQ

How does the AutoShutdown feature reduce power consumption?

When FORCEON is low and FORCEOFF is high, the device monitors receiver inputs. If no valid RS-232 signal levels are detected for 30µs, the internal charge pump and drivers shut off, reducing supply current to 1µA until a valid signal reactivates the device.

What is the purpose of the INVALID output pin?

The INVALID output goes low when no valid RS-232 signal levels are present on any receiver input. It can be used by software to indicate DTR or Ring Indicator signals or to control shutdown states.

Can the MAX3221E drive serial mice directly?

The MAX3221E lacks the specific complementary outputs found in the MAX3243E designed for mouse driveability. For direct mouse driving with low-power monitoring, the MAX3243E or MAX3244E/MAX3245E (AutoShutdown Plus) are recommended.