Diodes Incorporated PT7A7614S-13

Overview

PT7A7614S-13 from Diodes Incorporated is a precision microprocessor (µP) supervisor IC with active-low reset output, 2.93V supply-voltage monitoring threshold, 200ms reset pulse width, and integrated watchdog timer (1.6s timeout). It monitors VCC during power-up/down/brownout, detects low-battery conditions via 1.25V PFI comparator, and supports manual reset triggering - used in embedded controllers requiring reliable power sequencing and fault recovery.

For engineers reviewing the PT7A7614S-13 datasheet, PT7A7614S-13 pinout, PT7A7614S-13 application, or PT7A7614S-13 equivalent, key selection criteria include its guaranteed RESET validity down to VCC = 1V, TTL/CMOS-compatible MR input with 250µA internal pull-up, SO-8 package compatibility, and dual-function PFO/PFI interface for power-fail warning in battery-backed systems.

Technical Context

The PT7A7614S-13 implements a precision bandgap-based voltage monitor with ±2% reset threshold accuracy (2.93V nominal), hysteresis of 0.8% VRN, and guaranteed operation across -40°C to +85°C. Its internal 200ms one-shot timer ensures consistent reset assertion duration independent of VCC ramp rate.

It integrates a transition-detecting watchdog circuit that triggers WDO low after 1.6s of static WDI state (high or low), cleared automatically on RESET assertion or WDI edge detection. The 1.25V PFI comparator operates independently with ±25mV threshold tolerance and sub-1µA input current, enabling direct connection to battery-sense resistive dividers.

Key Specifications

Pinout & Package

PT7A7614S-13 is housed in an industry-standard SO-8 package (4.90mm × 6.00mm, 1.27mm pitch), RoHS-compliant and halogen-free, with exposed pad not present. Pin functions are validated per Diodes DS41672 Rev. 1–2 (Jan 2019).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX809TRD3+T and TPS3808G33DBVR, PT7A7614S-13 uniquely integrates reset supervision, watchdog timing, and independent 1.25V power-fail detection in a single SO-8 package - reducing BOM count and PCB area while enabling coordinated fault response in resource-constrained embedded systems.

Availability

PT7A7614S-13 is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-backed real-time clocks, medical infusion pump controllers, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for PT7A7614S-13 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 is a global semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and protection applications.

The PT7A76xx family belongs to Diodes' µP supervisor product line, designed specifically to replace discrete reset circuits in embedded systems where reliability, low quiescent current, and multi-function integration are critical.

FAQ

What is the minimum VCC required for PT7A7614S-13 to assert a valid RESET signal?

The device guarantees RESET output validity down to VCC = 1.0V, with VOL ≤ 0.4V at ISINK = 3.2mA. This ensures robust reset assertion during deep brownout conditions common in battery-powered systems before complete power collapse.

Can the PFI input be left unconnected without affecting reset functionality?

Yes - PFI may be tied to GND or VCC when unused, per datasheet recommendation. Leaving it floating is not advised due to potential noise coupling; however, PFI is electrically isolated from the reset generator, so misconnection does not impair RESET timing or threshold accuracy.

How does the watchdog timer interact with the manual reset (MR) input?

Asserting MR clears the watchdog timer and forces WDO high. If WDO is externally connected to MR (common in NMI-based recovery schemes), a watchdog timeout will trigger a full system reset - but only after the 200ms RESET pulse completes, ensuring deterministic recovery timing.

Is PT7A7614S-13 compatible with 1.8V microcontrollers?

No - its specified VCC operating range is 3.0V to 5.5V, and the 2.93V reset threshold is incompatible with 1.8V logic rails. For 1.8V systems, consider PT7A7613S-13 (3.08V threshold) with appropriate level-shifting on MR/PFO/WDO lines if interfacing with lower-voltage peripherals.