Renesas X5163S8I

Overview

X5163S8I from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 16Kbit SPI EEPROM in an 8-lead SOIC package. It asserts active-low RESET during power-up (valid down to VCC = 1V), monitors VCC against a factory-set 4.5V trip point (±0.125V), supports three selectable watchdog timeout intervals (200ms/600ms/1.4s), and operates from 4.5V to 5.5V - used in industrial microcontroller systems requiring reliable boot sequencing and nonvolatile configuration storage.

For engineers reviewing the X5163S8I datasheet, X5163S8I pinout, X5163S8I application, or X5163S8I equivalent, this device delivers integrated reset supervision with programmable VTRIP, block-lock EEPROM protection, and SPI-compatible timing - critical for embedded systems where brownout resilience, firmware integrity, and in-circuit configurability must coexist in minimal board space.

Technical Context

The X5163S8I implements a dual-function CS/WDI pin that serves as both chip select and watchdog input: a HIGH-to-LOW transition resets the watchdog timer, while sustained CS inactivity beyond the selected timeout triggers RESET assertion. Its reset logic combines power-on reset (tPURST = 200ms typ), low-VCC detection (VTRIP = 4.5–4.75V), and watchdog fault response into a single open-drain output.

Voltage threshold programming is supported via external VP pulses on SCK/SI pins under specific bias conditions, enabling field-adjustment of VTRIP within 1.7–5.0V range. The EEPROM uses Intersil's Direct Write™ cell architecture (100k write cycles, 100-year retention) with 32-byte page writes and self-timed 5ms typical write cycles.

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 EEPROM applications.

Compared with X5163S8I, MAX6361KA29+T offers identical EEPROM capacity but sacrifices VTRIP adjustability, while STM6315SW33F reduces integration by omitting memory - making X5163S8I the sole option combining field-programmable reset thresholds, watchdog flexibility, and on-chip 16Kbit EEPROM in one 8-pin SOIC.

Availability

X5163S8I is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X5163S8I 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-reliability analog and mixed-signal ICs for industrial, computing, and communications infrastructure.

The X5163 family targets embedded systems needing consolidated power supervision and nonvolatile storage - reducing discrete component count while maintaining robustness against voltage faults and software hangs.

FAQ

What is the factory-programmed VTRIP voltage for X5163S8I?

The X5163S8I has a factory-programmed VTRIP range of 4.5V to 4.75V, corresponding to the "-4.5A" suffix variant. This threshold is guaranteed over temperature and ensures reset activation before most 5V-tolerant MCUs enter undefined operating regions. The value is stored nonvolatily and remains stable unless reprogrammed using the documented VP pulse sequence on SCK/SI pins.

Can the watchdog timeout interval be changed after soldering X5163S8I onto a PCB?

Yes, the watchdog timeout interval for X5163S8I can be reconfigured in-circuit via the WRSR instruction to modify nonvolatile WD0/WD1 bits in the Status Register. No hardware modification is needed - the change persists across power cycles and remains effective until overwritten. The three available intervals (200ms, 600ms, 1.4s) are selected solely by these two bits.

Does X5163S8I support SPI mode 0,1 or only mode 0,0 and 1,1?

X5163S8I explicitly supports only SPI modes 0,0 (CPOL = 0, CPHA = 0) and 1,1 (CPOL = 1, CPHA = 1), as stated in the datasheet. It does not support modes 0,1 or 1,0. The SCK idle state and data sampling edges are fixed per mode; attempting mode 0,1 will result in misaligned data reads/writes and command rejection.

How does the Block Lock™ protection work on X5163S8I's EEPROM?

X5163S8I's Block Lock™ protection uses nonvolatile BL0/BL1 bits to lock 0%, 25%, 50%, or 100% of the 2K-byte EEPROM array against write operations. When enabled, protected blocks remain readable but reject WRITE commands. Locking is enforced by hardware and cannot be overridden by software unless BL bits are rewritten - which requires WREN and WRSR sequences with WP pin HIGH.

Is X5163S8I RoHS-compliant and lead-free?

Yes, X5163S8I is RoHS-compliant and manufactured with Pb-free plus anneal process - featuring 100% matte tin termination finish and RoHS-compliant molding compounds. It meets IPC/JEDEC J-STD-020 reflow requirements and is rated for peak reflow temperatures up to 260°C, making it suitable for standard lead-free assembly processes.