Renesas M5295AFP#CF0R

Overview

M5295AFP#CF0R from Renesas Electronics is a dual-voltage watchdog timer IC with power-on reset and adjustable detection thresholds, designed for system-level supervision of +5 V microcomputer power supplies. It delivers 0.8 mA typical supply current, supports 4–15 V operation, and provides two independent reset outputs (RST1, RST2) with programmable voltage detection via external resistors.

For engineers reviewing the M5295AFP#CF0R datasheet, M5295AFP#CF0R pinout, M5295AFP#CF0R application, or M5295AFP#CF0R equivalent, this device serves as a precision supervisory circuit for embedded MCU systems requiring reliable power-up sequencing, brownout protection, and watchdog timeout recovery in industrial control and instrumentation applications.

Technical Context

The M5295AFP#CF0R integrates a watchdog timer with 0.5–1.7 ms timeout (adjustable via RC network on TC pin), dual independent voltage detectors (VTH1 = 4.05–4.45 V, VTH2(L) = 4.45–4.75 V), and internal reference voltage generator (1.24 V). Its TC pin implements charge/discharge timing logic to distinguish normal clock pulses from stuck or missing watchdog signals.

It features two open-drain reset outputs: RST1 (active-low watchdog reset) and RST2 (active-low power-on/brownout hold), each with 0.1 V typical saturation voltage at 1 mA load. The WD input accepts pulse-width-limited signals (≥3 µs) and requires AC coupling via external capacitor to reject noise and ensure reliable watchdog clearing.

Key Specifications

Pinout & Package

Package: PRSP0008DE-C - 8-pin SOP (Small Outline Package), 4.4 mm × 4.85 mm body, 1.27 mm pitch, surface-mount, lead-free (RoHS compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar watchdog timer applications.

Compared with MAX6816ESA+ and TPS3823-50DBVR, the M5295AFP#CF0R uniquely combines dual adjustable voltage detection, sub-millisecond watchdog timing, and two independent open-drain reset outputs - enabling granular system-level supervision unattainable with fixed-threshold alternatives.

Availability

M5295AFP#CF0R is available at Aetrix Electronics and suitable for industrial automation, test equipment, and medical diagnostic instruments requiring stable component supply across extended product lifecycles.

Supply support for M5295AFP#CF0R 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise applications.

The M5295AFP#CF0R belongs to Renesas' legacy watchdog timer family, engineered specifically for robust power-supply monitoring and microcomputer system reset in cost-sensitive industrial control and instrumentation platforms.

FAQ

What is the primary function of the M5295AFP#CF0R in a microcomputer system?

The M5295AFP#CF0R serves as a dual-function supervisory IC that provides both power-on reset and watchdog timer functionality. It monitors the +5 V supply voltage using two independently adjustable thresholds (VTH1 and VTH2(L)) and watches the microcomputer's clock signal via the WD input. When anomalies occur-such as supply brownout or missing watchdog pulses-it asserts RST1 or RST2 to force a controlled system reset or hold state. This ensures reliable startup and runtime fault recovery in the M5295AFP#CF0R-equipped system.

Can the M5295AFP#CF0R operate outside the standard 5 V supply range?

Yes, the M5295AFP#CF0R supports a wide supply voltage range of 4 V to 15 V, making it compatible with systems using 5 V, 12 V, or other intermediate rails. Its internal circuitry remains functional across this range, and detection thresholds scale proportionally with VCC. However, the recommended operating voltage is 5 V, and key parameters like VTH1 (4.25 V ±0.2 V) and VTH2(L) (4.6 V ±0.1 V) are specified at nominal 5 V operation. Always verify timing and threshold behavior under actual application voltage conditions for the M5295AFP#CF0R.

How do I configure the watchdog timeout period for the M5295AFP#CF0R?

The watchdog timeout (tWD) of the M5295AFP#CF0R is set externally using a resistor (R1 = 10 kΩ to 30 kΩ) and capacitor (C) connected to the TC pin (Pin 2). The nominal formula is tWD = 1.1 × C × R1, yielding 0.5–1.7 ms for C = 0.1 µF and R1 = 10–30 kΩ. The M5295AFP#CF0R datasheet provides detailed guidance on selecting R1/C values and warns against exceeding 1.1 s maximum tWD. Ensure the WD input pulse width is ≥3 µs and frequency exceeds 1/tWD to prevent spurious timeouts.

What is the purpose of the ADJ1 and ADJ2 pins on the M5295AFP#CF0R?

The ADJ1 (Pin 5) and ADJ2 (Pin 8) pins on the M5295AFP#CF0R allow external resistor dividers to adjust the primary (VTH1) and secondary (VTH2(L)) voltage detection thresholds. Each connects to an internal 1.24 V reference, enabling precise customization of trip points-for example, setting VTH1 to 4.1 V for tighter 5 V rail tolerance or VTH2(L) to 4.55 V for earlier brownout response. These pins make the M5295AFP#CF0R adaptable to diverse power architectures without requiring silicon revision.

Does the M5295AFP#CF0R meet RoHS compliance and what package does it use?

Yes, the M5295AFP#CF0R uses the PRSP0008DE-C package-a lead-free, RoHS-compliant 8-pin SOP (4.4 mm × 4.85 mm, 1.27 mm pitch)-and conforms to EU RoHS Directive requirements. Renesas explicitly states environmental compliance in its documentation and recommends verifying latest status via official channels. The M5295AFP#CF0R is classified as "Standard" grade per Renesas quality policy, intended for industrial, office, and communications equipment-not safety-critical or life-support applications.