Diodes Incorporated PT7M6834WD1C3EX

Overview

PT7M6834WD1C3EX from Pericom Semiconductor is an ultra-low-voltage supervisor IC with open-drain active-low reset output, factory-set 1.665 V reset threshold (±1.5% accuracy), 1.5 ms timeout period, and 7.5 µA typical supply current. It monitors +1.2V to +1.8V core supplies in portable microprocessor systems, asserting RESET when VCC drops below threshold or during brownout.

For engineers reviewing the PT7M6834WD1C3EX datasheet, PT7M6834WD1C3EX pinout, PT7M6834WD1C3EX application, or PT7M6834WD1C3EX equivalent, key selection criteria include open-drain output compatibility with bidirectional µP reset pins, guaranteed reset validity down to 0.9 V VCC, immunity to short negative VCC transients, and support for multi-supply level-shifting via external pull-up.

Technical Context

The PT7M6834WD1C3EX implements a precision voltage comparator with 444 mV internal reference and ±1.5% threshold accuracy over –40°C to +85°C, enabling reliable detection of low-voltage brownouts in 1.2V–1.8V digital systems. Its reset logic includes fixed 1.5 ms timeout delay and hysteresis (0.75% of VTH) to prevent chatter during slow-rising VCC.

Designed for SC70-3L package, it features open-drain RESET output requiring external pull-up-enabling interface with higher-voltage logic domains (up to 6 V) and seamless integration with µPs having bidirectional reset I/O. No manual reset (MR) or RESET-IN pins are present; monitoring is solely VCC-referenced.

Key Specifications

Pinout & Package

PT7M6834WD1C3EX is housed in a lead-free, RoHS-compliant SC70-3L (C3) package - 1.25 mm × 0.85 mm × 0.5 mm, 0.65 mm pitch - optimized for space-constrained portable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TPS3808G16DBVR and MAX6374XR29D3+, PT7M6834WD1C3EX provides verified open-drain interoperability with bidirectional µP reset pins, documented immunity to negative VCC transients, and guaranteed reset validity down to 0.9 V-making it optimal for portable systems demanding robust, low-component-count supervision.

Availability

PT7M6834WD1C3EX is available at Aetrix Electronics and suitable for portable medical sensors, wearable fitness trackers, industrial handheld terminals, and low-power IoT edge nodes requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.

Supply support for PT7M6834WD1C3EX 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 (now part of Diodes Incorporated) is a fabless analog/mixed-signal IC designer specializing in high-reliability power management, timing, and interface solutions for computing, communications, and industrial markets.

PT7M6834WD1C3EX belongs to the PT7M6832–6840 ultra-low-voltage detector family, engineered specifically for reliable brownout protection in battery-powered 1.2V–1.8V microprocessor systems with minimal external components.

FAQ

What is the minimum VCC required for valid reset assertion?

The PT7M6834WD1C3EX guarantees valid active-low RESET assertion down to VCC = 0.9 V. Below this, the open-drain output remains functional but may not maintain full sink capability; a pull-down resistor (e.g., 100 kΩ to GND) ensures RESET stays low during deep brownout, preventing undetermined logic states on µP reset pins.

Can the RESET pin drive a 3.3V logic input?

Yes - the open-drain RESET output supports pull-up to any voltage between 0 V and 6.0 V. Connecting a 10–47 kΩ resistor from RESET to a 3.3 V rail enables direct interfacing with 3.3 V µP reset inputs, providing level-shifted, bidirectional reset capability without additional logic or translators.

Is a bypass capacitor required on VCC?

A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin is recommended. It improves immunity to short-duration negative VCC transients (e.g., from nearby switching regulators), reduces noise coupling into the precision reference circuit, and stabilizes internal bias currents during rapid load changes.

Does PT7M6834WD1C3EX support manual reset or external threshold adjustment?

No - PT7M6834WD1C3EX is a dedicated VCC-monitored supervisor with fixed 1.665 V threshold and 1.5 ms timeout. It lacks MR and RESET-IN pins. For manual reset capability, consider PT7M6835/6836/6837 (SOT143-4L); for adjustable threshold, select PT7M6838/6839/6840 (also SOT143-4L).