ST4G3234BJR

Translators, Level Shifters Overview

The ST4G3234BJR is a dual supply low voltage CMOS 4-bit bus buffer level translator fabricated with sub-micron silicon gate and five-layer metal wiring C2MOS technology. It provides high-speed asynchronous communication between data buses, supporting mixed supply systems such as 3.3V/1.8V, 3.3V/2.5V, 1.8V/1.4V, and 2.5V/1.8V. The device operates within an input/output voltage range of 1.4V to 3.6V, achieving maximum data rates of 380 Mbps for 1.8V to 3.3V translation and 260 Mbps for other combinations. Propagation delay is typically 2.0ns with a maximum of 5.5ns at 10pF load.

Translators, Level Shifters Feature Summary

• Features power-down protection on inputs and outputs to effectively isolate buses when both power supplies are down.
• Includes a 26-ohm series resistor on the A side outputs to manage signal integrity.
• Provides symmetrical output impedance ensuring balanced drive capabilities across operating voltages.
• Equipped with input tolerant buffers that translate signals greater than VCCB up/down to VCCA.

Translators, Level Shifters Applications

• Interface between 3.3V bus and 2.5V or 1.8V bus in mixed supply systems
• One-way asynchronous communication between data buses
• Level translation in 3.3V/1.8V, 3.3V/2.5V, 1.8V/1.4V, and 2.5V/1.8V supply environments

Translators, Level Shifters Procurement Notes

Verify the specific ordering suffix BJR corresponds to the Flip-Chip11 package configuration before procurement. Confirm that the required quantity aligns with the standard reel size of 5000 parts per reel as documented in the order codes table. Ensure that the application environment remains within the specified operating temperature range of -40°C to +85°C to maintain functional reliability and electrical specifications.

Translators, Level Shifters Selection Notes

Select this component when designing interfaces requiring unidirectional data transfer between different logic voltage domains. It is suitable for applications needing low quiescent current consumption while maintaining high-speed performance. Consider the Flip-Chip11 package constraints and ensure adequate thermal management if operating near the upper temperature limits. Verify that the load capacitance requirements fall within the tested ranges for accurate propagation delay estimation.

Translators, Level Shifters Part Context

This component belongs to STMicroelectronics' family of low voltage CMOS bus buffers and level translators. These devices are engineered to facilitate seamless connectivity between legacy 3.3V systems and modern lower voltage digital circuits. The ST4G3234 specifically addresses the need for robust, high-speed translation in mixed-voltage embedded designs without introducing significant power dissipation or signal degradation.

Translators, Level Shifters Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

Translators, Level Shifters FAQ

What is the maximum data rate supported by the ST4G3234?

The device supports a maximum data rate of 380 Mbps for 1.8V to 3.3V translation and 260 Mbps for other voltage combinations.

How does the device behave during power-down conditions?

Power-down protection on inputs and outputs disables the device when both power supplies are down, effectively isolating the buses.

What is the purpose of the series resistor included in this IC?

A 26-ohm series resistor is integrated on the A side outputs to assist with signal integrity and impedance matching.