Diodes Incorporated PI74STX1GU04CEX

Overview

PI74STX1GU04CEX from Pericom Semiconductor is a single unbuffered inverter logic gate operating across 1.65V–5.5V supply, delivering 2.6ns typical propagation delay into 50pF at 5V, ±8mA balanced output drive at 3V, and high-impedance power-down capability-used in level-shifting, clock buffering, and oscillator circuits where low-capacitance inversion is required.

For engineers reviewing the PI74STX1GU04CEX datasheet, PI74STX1GU04CEX pinout, PI74STX1GU04CEX application, or PI74STX1GU04CEX equivalent, key selection criteria include unbuffered output behavior, VDD range compatibility with mixed-voltage systems, input/output leakage limits, thermal derating for SC70 package, and AC loading sensitivity at 10MHz PRR.

Technical Context

This device implements a CMOS unbuffered inverter stage with no internal gain staging-enabling direct use in relaxation oscillators and analog feedback loops. Its rail-to-rail input threshold (VIH = 0.8VDD, VIL = 0.2VDD) and symmetrical output drive support bidirectional signal conditioning in low-power interface circuits.

The SC70-5 package imposes 150mW absolute maximum power dissipation and requires attention to PCB copper area and ambient temperature when operating near ICC = 20μA quiescent current under full-load switching at 10MHz. Input rise/fall time limits (≤10ns/V at 3.3V) constrain usable edge rates in high-speed routing.

Key Specifications

Pinout & Package

Package: 5-pin SC70 (Package Code C), JEDEC MO-203B/AA compliant, 1.25mm × 2.00mm footprint, 0.65mm pitch, 0.9mm max height.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unbuffered inverter applications.

Compared with SN74LVC1G04DBVR and NC7SZ04P5X, PI74STX1GU04CEX uniquely supports oscillator design due to its unbuffered architecture and lower ICC (2.0μA typ), while offering tighter tPD consistency across VDD range-critical for mixed-supply timing alignment.

Availability

PI74STX1GU04CEX is available at Aetrix Electronics and suitable for USB interface design, microcontroller reset conditioning, RC oscillator generation, and low-power sensor enable sequencing requiring stable component supply and consistent SC70-5 packaging.

Supply support for PI74STX1GU04CEX 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

Pericom Semiconductor was a fabless provider of high-speed interface, timing, and signal-integrity solutions, acquired by Diodes Incorporated in 2016; known for low-jitter clock devices and logic optimized for mixed-signal systems.

The PI74STX1GU04 belongs to the SOTiny™ Gate STX family, designed specifically for space-constrained, low-power applications demanding unbuffered logic behavior-especially in oscillator circuits, level translation, and power-aware enable control.

FAQ

Can PI74STX1GU04CEX be used in crystal oscillator circuits?

Yes-its unbuffered output stage is explicitly designed for use in Pierce and Colpitts oscillator topologies. The datasheet confirms linear-region operation capability, and application note PS8562E specifies thermal derating guidance when operating in sustained analog mode. Do not exceed 150mW package power limit under continuous oscillation.

What is the maximum recommended input rise/fall time for reliable switching?

At 3.3V VDD, input edge rates must not exceed 10ns/V (i.e., ≤33ns for full 0–3.3V transition) per datasheet Section "Recommended Operating Conditions." Faster edges risk shoot-through current and increased EMI; use series termination if driving from high-slew-rate sources like FPGA outputs.

Is Pin 4 (NC) safe to connect to ground or leave floating?

Pin 4 is internally unconnected and must remain unpopulated and unconnected on the PCB. Connecting it to ground, VDD, or any signal violates the mechanical and electrical design intent, risks internal damage, and voids parametric guarantees. Follow Pericom's PD-1901 package drawing strictly.

How does power-down high-impedance mode behave during VDD ramp-up?

During power-on, the device enters high-impedance I/O state until VDD exceeds 0.8V, then transitions to functional logic after internal bias stabilization (~100ns). Inputs must be held valid before VDD reaches 1.65V to prevent metastability; external pull resistors are recommended for deterministic startup behavior.