Renesas X5163S8Z-2.7A

Overview

X5163S8Z-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-pin SOIC package. It delivers active-low RESET output, programmable 2.85V–3.0V VTRIP threshold, selectable watchdog timeout (200ms/600ms/1.4s), and operates from 2.7V to 5.5V - enabling reliable boot sequencing and brownout protection in embedded microcontroller systems.

For engineers reviewing the X5163S8Z-2.7A datasheet, X5163S8Z-2.7A pinout, X5163S8Z-2.7A application, or X5163S8Z-2.7A equivalent, this device serves as a system-level reliability enhancer where deterministic power-up timing, nonvolatile configuration storage, and fail-safe watchdog monitoring are required - especially in industrial controllers, point-of-sale terminals, and battery-backed instrumentation.

Technical Context

The X5163S8Z-2.7A implements a dual-function CS/WDI pin for chip select and watchdog input, with a volatile flag bit distinguishing watchdog vs. low-voltage reset events. Its internal architecture combines analog voltage sensing with digital state machines for reset generation and SPI EEPROM control logic.

It supports 2MHz SPI interface (modes 0,0 and 1,1), features Block Lock™ protection for 0%, 25%, 50%, or 100% of the 16Kbit EEPROM array, and allows in-circuit reprogramming of the VTRIP threshold using dedicated VP-based sequences - all while maintaining <1µA standby current with watchdog disabled.

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 MAX6369KA29+T and STM6803RWDY6F, the X5163S8Z-2.7A uniquely combines field-programmable VTRIP, watchdog timeout selection, and protected EEPROM in one 8-pin SOIC - making it optimal for systems requiring adaptive voltage monitoring and persistent, secure configuration storage without BOM expansion.

Availability

X5163S8Z-2.7A is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical infusion pump controllers, smart energy meters, POS terminals with secure boot, and battery-backed instrumentation requiring stable component supply across extended product lifecycles.

Supply support for X5163S8Z-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 high-performance analog and mixed-signal ICs for power management, precision analog, and timing applications.

The X5163S8Z-2.7A belongs to Intersil's CPU Supervisor family, designed specifically to consolidate reset, watchdog, voltage monitoring, and nonvolatile storage functions into single-chip solutions for resource-constrained embedded systems.

FAQ

What is the factory-programmed VTRIP voltage range for X5163S8Z-2.7A?

The X5163S8Z-2.7A is factory-programmed with a VTRIP range of 2.85V to 3.0V, optimized for 3V nominal supply rails. This threshold is guaranteed over temperature (0°C to 70°C) and remains stable unless reprogrammed using the VP-based VTRIP adjustment sequence documented in the FN8128 datasheet. The X5163S8Z-2.7A maintains this specification without requiring external components or calibration.

Does X5163S8Z-2.7A support both active-low and active-high reset outputs?

No - the X5163S8Z-2.7A provides only an active-low open-drain RESET/RESET output. It does not offer an active-high variant; that functionality is implemented in the pin-compatible X5165S8Z-2.7A sibling device. The X5163S8Z-2.7A's output must be pulled up externally to VCC or another logic rail to generate a valid reset signal for most microcontrollers.

How is the watchdog timeout period configured on X5163S8Z-2.7A?

The watchdog timeout on X5163S8Z-2.7A is configured via two nonvolatile bits (WD1 and WD0) in the status register, programmed using the WRSR instruction. Valid combinations yield 200ms (WD1=1, WD0=0), 600ms (WD1=0, WD0=1), or 1.4s (WD1=0, WD0=0); WD1=1, WD0=1 disables the watchdog. These settings persist across power cycles and can be locked using the WP pin and WPEN bit.

Can the EEPROM in X5163S8Z-2.7A be written to during normal system operation?

Yes - the 16Kbit SPI EEPROM in X5163S8Z-2.7A supports in-system programming during normal operation. Writes require issuing WREN first, then WRITE with address and data, and complete in ≤5ms per 32-byte page. Block Lock™ protection can restrict write access to selected memory regions, and the WP pin + WPEN bit can permanently lock status register writes to prevent accidental configuration changes.

What is the minimum VCC level at which X5163S8Z-2.7A asserts RESET/RESET during power-up?

The X5163S8Z-2.7A asserts RESET/RESET as soon as VCC reaches 1V and holds the signal active for ≥200ms after VCC stabilizes above the VTRIP threshold. This ensures robust reset assertion even with slow-rising or noisy power supplies, and the reset remains valid down to VCC = 1V - a key differentiator for battery-fail scenarios where other supervisors may release prematurely.