Renesas X5163S8

Overview

X5163S8 from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 16Kbit SPI EEPROM in a single 8-lead SOIC package. It asserts active-low RESET at VCC ≥ 1V, supports selectable watchdog timeout (200ms/600ms/1.4s), features reprogrammable VTRIP threshold (4.5–4.75V for X5163S8Z-4.5A variant), and operates from 4.5V to 5.5V - used in embedded microcontroller systems requiring reliable boot sequencing and nonvolatile configuration storage.

For engineers reviewing the X5163S8 datasheet, X5163S8 pinout, X5163S8 application, or X5163S8 equivalent, this page delivers verified functional identity, validated SOIC-8 pin mapping, confirmed 4.5–4.75V reset threshold and 200ms power-up reset timeout, real-world EEPROM block-lock protection behavior, and two manufacturer-confirmed alternative parts with documented differences in VTRIP range and temperature grade.

Technical Context

The X5163S8 implements a dual-function reset architecture: power-on reset activates at VCC = 1V and holds RESET low for 100–280ms until VCC exceeds its factory-set or user-programmed VTRIP (4.5–4.75V) and stabilizes for 200ms; simultaneous low-voltage monitoring asserts RESET if VCC drops below that same VTRIP during operation. Its watchdog circuit uses CS/WDI pin toggling with nonvolatile WD0/WD1 bits selecting fixed timeout intervals - no clock source dependency beyond SCK.

EEPROM functionality is implemented as a 2K × 8 array with Block Lock™ protection controlled by BL0/BL1 bits, supporting 32-byte page writes with 5ms typical write cycle time and 100,000 endurance cycles. Communication occurs over 2MHz SPI (modes 0,0 and 1,1), requiring WREN instruction before write and RDSR polling of WIP bit to confirm completion.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (RoHS-compliant, MDP0027 footprint).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CPU supervisor with integrated EEPROM applications.

Compared with MAX6361KA29+T and STM6809RWDJ6F, the X5163S8 uniquely delivers field-adjustable 4.5–4.75V reset threshold, integrated 16Kbit EEPROM with hardware block lock, and 4.5–5.5V operation - making it the only option satisfying precision 5V brownout detection with embedded nonvolatile storage in a single SOIC-8 package.

Availability

X5163S8 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, automotive infotainment head units, and smart energy meters requiring stable component supply with long-term lifecycle support.

Supply support for X5163S8 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 (now part of Renesas Electronics) designs high-performance analog and power management ICs for industrial, computing, and communications markets - emphasizing reliability, integration, and long-term product availability.

The X5163S8 belongs to Intersil's CPU Supervisor family, engineered to consolidate power monitoring, reset generation, watchdog safety, and nonvolatile storage into one die - targeting cost-sensitive, space-constrained embedded systems needing certified boot integrity.

FAQ

What is the exact reset threshold voltage for X5163S8?

The X5163S8 variant designated X5163S8Z-4.5A has a factory-programmed VTRIP range of 4.5V to 4.75V, with typical value 4.63V. This threshold is reprogrammable within 1.7–5.0V using the VP programming sequence defined in the FN8128 datasheet - confirming X5163S8 supports precise adjustment for 5V rail tolerance compliance.

Does X5163S8 support both active-low and active-high reset outputs?

No - the X5163S8 provides only an active-low open-drain RESET/RESET output. The datasheet confirms X5163 denotes active-low reset (RESET), while X5165 denotes active-high (RESET). Since the part number is X5163S8, it implements the active-low version exclusively; no internal configuration changes the polarity.

Can the watchdog timeout interval be changed dynamically in firmware for X5163S8?

Yes - the watchdog timeout (200ms/600ms/1.4s/disabled) is selected by nonvolatile WD0/WD1 bits in the Status Register, which can be modified via WRSR instruction during normal operation. Once written, the setting persists across power cycles, enabling runtime adaptation of supervision timing without hardware change - a confirmed feature of X5163S8.

What EEPROM protection mechanisms does X5163S8 provide?

X5163S8 implements three-tiered EEPROM protection: (1) Power-up/power-down write inhibit circuitry, (2) Block Lock™ via BL0/BL1 bits to protect 0%/25%/50%/100% of the 16Kbit array, and (3) In-Circuit Programmable ROM mode using WP pin + WPEN bit to lock Status Register writes. All are documented in FN8128 for X5163S8.

Is X5163S8 RoHS compliant and what is its package type?

Yes - X5163S8 is RoHS compliant and supplied in an 8-lead SOIC package (MDP0027 footprint), with Pb-free plus anneal termination finish compatible with both SnPb and lead-free reflow soldering per IPC/JEDEC J-STD-020. This is explicitly stated in the Ordering Information table of FN8128 for X5163S8Z-4.5A.