Renesas X5163S8-2.7A

Overview

X5163S8-2.7A from Intersil (now Renesas) 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 operates from 2.7V to 5.5V, features a factory-programmed 2.85V–3.0V reset threshold, supports 2MHz SPI communication, and delivers <50µA standby current with watchdog enabled - used in embedded microcontroller systems requiring reliable boot sequencing and nonvolatile configuration storage.

For engineers reviewing the X5163S8-2.7A datasheet, X5163S8-2.7A pinout, X5163S8-2.7A application, or X5163S8-2.7A equivalent, this page provides verified functional identity, validated pin roles, confirmed VTRIP and watchdog timing, real-world use cases for industrial controllers and IoT edge nodes, and two technically documented alternative parts with explicit differences in reset polarity and temperature range.

Technical Context

The X5163S8-2.7A implements a dual-function reset architecture: power-on reset activates at VCC = 1V and holds RESET/RESET active for ≥100ms (typical 200ms), while low-voltage detection asserts RESET/RESET when VCC drops below its programmed 2.85V–3.0V trip point. The watchdog timer uses nonvolatile WD0/WD1 bits to select fixed timeout intervals of 200ms, 600ms, or 1.4s - independent of power cycling.

Its SPI interface complies with modes 0,0 and 1,1, supports 32-byte page writes with self-timed 5ms (typical) write cycles, and includes block-lock protection covering 0%, 25%, 50%, or 100% of the 2K × 8 EEPROM array. The device also integrates a volatile flag bit to distinguish watchdog-triggered resets from brownout events.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T, X5163S8-2.7A integrates EEPROM and low-VCC detection, eliminating BOM count and interconnect complexity; compared with X5163S8IZ-2.7A, it trades extended temperature range for cost optimization in commercial-grade applications.

Availability

X5163S8-2.7A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, smart meter interface modules, and automotive body control units requiring stable component supply with long-term lifecycle assurance.

Supply support for X5163S8-2.7A 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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in precision analog, power management, and interface solutions for industrial, communications, and computing markets.

The X5163 family was designed to consolidate reset, watchdog, voltage monitoring, and EEPROM functions into a single chip for microcontroller-based systems - reducing board area and improving system reliability in space-constrained embedded applications.

FAQ

What is the factory-programmed reset threshold voltage for X5163S8-2.7A?

The X5163S8-2.7A has a factory-programmed VTRIP range of 2.85V to 3.0V, optimized for 3.3V supply rails. This threshold is nonvolatile and remains stable over temperature and time unless explicitly reprogrammed using the VP-based VTRIP adjustment procedure defined in the FN8128 datasheet. The device asserts RESET/RESET when VCC falls below this value and holds it active until VCC rises above the threshold for ≥200ms.

Does X5163S8-2.7A support both active-low and active-high reset outputs?

No, X5163S8-2.7A provides only an active-LOW open-drain RESET/RESET output. Its sibling part X5165S8-2.7A offers active-HIGH reset. The "X5163" designation explicitly indicates active-LOW reset behavior, and the pin is electrically configured as open-drain to allow wired-OR connection with other reset sources. Pull-up resistors must be used externally to establish the inactive HIGH state.

Can the watchdog timeout interval of X5163S8-2.7A be changed dynamically during runtime?

Yes, the watchdog timeout interval of X5163S8-2.7A can be changed dynamically via the WRSR (Write Status Register) instruction, which modifies the nonvolatile WD0 and WD1 bits. Once written, the new interval persists across power cycles. However, the watchdog must be disabled (WD1=WD0=1) before writing new values, and the WP pin must be HIGH or WPEN=0 to allow Status Register modification - ensuring intentional, not accidental, reconfiguration.

What EEPROM protection mechanisms does X5163S8-2.7A provide?

X5163S8-2.7A provides three layers of EEPROM protection: (1) hardware WP pin + WPEN bit enabling In-Circuit Programmable ROM mode, (2) nonvolatile BL0/BL1 bits configuring Block Lock™ to protect 0%, 25%, 50%, or 100% of the 2K×8 array, and (3) Write Enable Latch (WEL) requiring WREN instruction before any write. These features prevent unintended writes during power transitions, firmware updates, or ESD events - critical for preserving calibration data or security keys.

Is X5163S8-2.7A pin-compatible with other members of the X5163/X5165 family?

Yes, X5163S8-2.7A is pin-compatible with all 8-lead SOIC variants in the X5163/X5165 family, including X5163S8Z-2.7, X5163S8IZ-2.7A, and X5165S8Z-2.7A. All share identical pinout, electrical characteristics, and SPI command set. Differences lie solely in VTRIP range (e.g., 2.55–2.7V vs. 2.85–3.0V), reset polarity (X5163 vs. X5165), and temperature grade (0–70°C vs. –40–85°C), allowing drop-in replacement where those parameters align with system requirements.