Renesas X40011V8-C

Overview

X40011V8-C from Intersil (now Renesas) is a dual-voltage supervisor IC with integrated CPU reset control, programmable watchdog timer, and fault detection register. It monitors VCC (V1MON) and a secondary voltage (V2MON), asserts active-low open-drain RESET and V2FAIL outputs, and supports I²C-compatible 2-wire interface. Designed for embedded systems requiring reliable power sequencing and brownout protection, it operates from 2.7V to 5.5V with 25µA standby current (watchdog enabled).

For engineers reviewing the X40011V8-C datasheet, X40011V8-C pinout, X40011V8-C application, or X40011V8-C equivalent, key selection considerations include its dual-threshold programmability (VTRIP1/VTRIP2), selectable power-on reset timeout (50/200/400/800ms), watchdog intervals (25ms/200ms/1.4s/off), independent core voltage monitoring via V2MON, and fault detection register for root-cause reset analysis.

Technical Context

The X40011V8-C implements two independent voltage comparators: one for VCC (V1MON) with user-programmable VTRIP1 threshold (2.0–4.75V range), and another for V2MON with programmable VTRIP2 (1.70–4.75V). Its reset logic generates an active-low open-drain RESET output valid down to VCC = 1V, with no power-up delay on V2FAIL.

It integrates a nonvolatile-control watchdog timer with four selectable timeouts, a 2-wire serial interface compliant with I²C timing (400kHz max), and a volatile fault detection register (FDR) that latches LV1F, LV2F, and WDF flags. The V2MON comparator is powered directly from V2MON (not VCC), enabling monitoring during VCC brownout.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (V8-C suffix denotes SOIC-8 with commercial temperature range, 0°C to +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6816EPA+ and TPS3808G33DBVR, the X40011V8-C uniquely delivers field-programmable thresholds, dual independent monitoring with V2MON-powered comparator, I²C-configurable watchdog and POR timing, and volatile fault detection - making it suitable for complex, diagnostics-aware embedded systems where flexibility and root-cause visibility are critical.

Availability

X40011V8-C is available at Aetrix Electronics and suitable for network storage controllers, industrial PLCs, telecom management units, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for X40011V8-C 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

Intersil Corporation, now part of Renesas Electronics, is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X40011V8-C belongs to Intersil's CPU Supervisor family, designed specifically for embedded systems requiring robust, multi-rail power monitoring, programmable reset timing, and intelligent fault diagnostics in space-constrained industrial and communications equipment.

FAQ

What is the function of the V2MON pin on the X40011V8-C?

The V2MON pin on the X40011V8-C is the input for the independent secondary voltage monitor. It accepts an external voltage (e.g., 1.8V core rail) and compares it against the programmable VTRIP2 threshold. When V2MON falls below VTRIP2, the device asserts the open-drain V2FAIL output. Critically, the V2MON comparator is powered from the V2MON pin itself - not VCC - so it remains operational even during main supply collapse, enabling true power-fail warning capability.

How does the X40011V8-C generate its reset signal, and what determines its duration?

The X40011V8-C generates an active-low open-drain RESET signal when VCC drops below the VTRIP1 threshold. The signal remains asserted until VCC rises above VTRIP1 and sustains that level for the selected power-on reset timeout period (tPURST). This timeout - configurable to 50ms, 200ms (factory default), 400ms, or 800ms via nonvolatile PUP1/PUP0 bits - ensures stable power and oscillator startup before releasing the processor from reset. The X40011V8-C guarantees RESET validity down to VCC = 1V.

Can the voltage thresholds of the X40011V8-C be changed after soldering to the PCB?

Yes, the VTRIP1 and VTRIP2 thresholds of the X40011V8-C can be reprogrammed in-circuit after PCB assembly. This is accomplished using a high-voltage programming sequence applied to the WDO pin while issuing specific I²C commands (Slave Address A0h, byte addresses 01h/09h for VTRIP1/VTRIP2) via the SDA/SCL interface. The procedure supports both increasing and decreasing thresholds, with a reset step required before lowering a threshold. No external components or test fixtures are needed - full adjustment is possible through standard firmware routines.

What role does the Fault Detection Register (FDR) play in system debugging with the X40011V8-C?

The Fault Detection Register (FDR) in the X40011V8-C is a volatile 8-bit register (address 0FFh) that latches the cause of the most recent reset event. Bits LV1F (low VCC), LV2F (low V2MON), and WDF (watchdog timeout) transition from '1' to '0' when their respective fault conditions occur. By reading the FDR via I²C immediately after reset, firmware can determine whether the reset was triggered by brownout, power-fail, or software hang - enabling targeted diagnostics, error logging, and recovery actions without ambiguity.

Is the X40011V8-C compatible with standard I²C buses, and what are its timing limits?

Yes, the X40011V8-C is fully compatible with standard-mode I²C buses, supporting clock frequencies up to 400kHz. Its SDA and SCL pins adhere to I²C electrical specifications: SDA is open-drain with internal pull-down disabled, requiring an external pull-up resistor; SCL is a CMOS input. The device responds to standard START/STOP conditions, acknowledges valid slave addresses (1011xxxR/W), and supports byte-write, random-read, and sequential-read protocols - enabling seamless integration into existing I²C-based system management architectures.