Diodes Incorporated PI4ULS5V201XVEX

Overview

PI4ULS5V201XVEX from Diodes Incorporated (acquired Pericom Semiconductor) is a 1-bit bidirectional auto-sensing level shifter with dual independent supplies (VCCA and VCCB), integrated 10 kΩ pull-up resistors, no direction-control pin required, and guaranteed 20 Mb/s data rate for push-pull operation - used in I²C/SMBus voltage translation between 1.2 V and 5.5 V domains in mobile phone baseband-PMIC interfaces.

For engineers reviewing the PI4ULS5V201XVEX datasheet, PI4ULS5V201XVEX pinout, PI4ULS5V201XVEX application, or PI4ULS5V201XVEX equivalent, this device supports rail-to-rail bidirectional logic translation without sequencing constraints, delivers sub-20 ns propagation delay, and integrates pull-ups to eliminate external components in open-drain bus designs.

Technical Context

The PI4ULS5V201XVEX implements auto-sensing one-shot circuitry per channel to detect signal edges and dynamically enable translation in either direction - eliminating need for external direction control. Its dual-supply architecture allows VCCA and VCCB to operate independently across 1.2 V–5.5 V, enabling asymmetric voltage translation (e.g., 1.8 V ↔ 3.3 V or 1.2 V ↔ 5.5 V).

It features overvoltage-tolerant EN input referenced to VCCA, tri-state capability via active-high enable, and internal 10 kΩ pull-up resistors on both A and B I/O lines - configurable for either VCCA or VCCB termination. Timing performance is specified under 15 pF load with ≤50 Ω driver impedance.

Key Specifications

Pinout & Package

PI4ULS5V201XVEX is packaged in an 8-pin UDFN1.2×1.6 mm lead-free, green-compliant package with wettable flank terminations for automated optical inspection (AOI). Thermal pad exposed on bottom enhances thermal dissipation in space-constrained mobile applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level translation applications.

Compared with TXS0102DCUR and PCA9306DCUR, PI4ULS5V201XVEX uniquely supports 1.2–5.5 V on both rails with integrated pull-ups in a 1.2×1.6 mm UDFN - making it optimal for ultra-compact, high-voltage mobile interfaces where BOM reduction and layout density are critical.

Availability

PI4ULS5V201XVEX is available at Aetrix Electronics and suitable for mobile phone baseband–PMIC links, camera module power management interfaces, and I²C/SMBus voltage translation requiring stable component supply across automotive infotainment, industrial handhelds, and IoT edge sensors.

Supply support for PI4ULS5V201XVEX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated acquired Pericom Semiconductor in 2017 and now manufactures and supports the PI4ULS5V201XVEX as part of its broad portfolio of interface and signal integrity solutions.

This device belongs to Diodes' Ultra-Low-Power Level Translation product line, designed specifically for space-constrained, battery-powered applications requiring robust mixed-voltage interoperability without external passive components.

FAQ

Can PI4ULS5V201XVEX translate between 1.2 V and 5.5 V simultaneously?

Yes - VCCA and VCCB can be set independently within 1.2 V to 5.5 V, enabling true asymmetric translation such as 1.2 V microcontroller I/O to 5.5 V sensor supply domain. The device's auto-sensing architecture and rail-to-rail input thresholds ensure reliable switching across the full range without external biasing.

Is the EN pin 5 V tolerant when VCCA = 1.8 V?

Yes - the EN input is overvoltage tolerant up to 5.5 V regardless of VCCA level. It is referenced to VCCA but designed to accept logic-high signals up to VCCA + 3.7 V, allowing direct connection to 3.3 V or 5 V enable sources without level shifting.

What is the impact of external pull-up resistors on the integrated 10 kΩ internal ones?

External resistors placed in parallel with A or B pins reduce effective pull-up resistance - e.g., a 10 kΩ external resistor halves total pull-up to ~5 kΩ. This increases rise time but improves noise immunity and sink current capability; timing must be re-verified per I²C specification at the new RC time constant.

Does PI4ULS5V201XVEX support hot insertion or live swapping between voltage domains?

No - while non-preferential power sequencing prevents damage during normal power-up, the device is not rated for hot insertion. Applying signal voltage to A or B pins before VCCA or VCCB is stabilized may cause undefined behavior or increased leakage; proper power sequencing remains recommended in system-level design.