Renesas X5163S8ZT1

Overview

X5163S8ZT1 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 at VCC ≥1V, supports selectable watchdog timeout (200ms/600ms/1.4s), offers reprogrammable VTRIP thresholds (e.g., 2.85–3.0V), and operates from 2.7V to 5.5V. It serves in microcontroller-based embedded systems requiring reliable boot sequencing and nonvolatile configuration storage.

For engineers reviewing the X5163S8ZT1 datasheet, X5163S8ZT1 pinout, X5163S8ZT1 application, or X5163S8ZT1 equivalent, this page delivers verified functional identity, validated pin roles, confirmed VTRIP programmability, real-world timing behavior (tPURST = 200ms typ.), and precise alternative part guidance - all grounded in FN8128 Rev 4.00.

Technical Context

The X5163S8ZT1 implements a dual-function reset architecture: power-on reset activates at VCC = 1V and holds RESET low for 200ms after stabilization, while low-voltage detection triggers RESET when VCC drops below a user-programmable VTRIP threshold with 20mV hysteresis. Its watchdog timer uses CS/WDI edge detection and nonvolatile WD0/WD1 bits to select timeout intervals without power-cycle dependency.

EEPROM functionality includes 16Kbit capacity organized as 2K × 8, Block Lock™ protection (0/¼/½/all array), 32-byte page writes, and self-timed 5ms typical write cycles. Communication occurs via 2MHz SPI Mode 0/Mode 3, with WREN/WRSR/READ/ WRITE opcodes and volatile flag bit for reset-source diagnostics.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (RoHS-compliant, MDP0027 footprint). Pin functions validated per FN8128 Rev 4.00 Page 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369ESA+ and STM8AF5288TDY, X5163S8ZT1 uniquely combines field-reprogrammable VTRIP, 16Kbit EEPROM, and deterministic 200ms power-up reset - enabling higher reliability in cost-sensitive industrial systems without MCU resource overhead.

Availability

X5163S8ZT1 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, long-term EEPROM data retention, and field-adjustable brownout thresholds.

Supply support for X5163S8ZT1 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) is a semiconductor company specializing in high-performance analog and power management ICs for industrial, computing, and communications markets.

The X5163/X5165 family was designed to consolidate power monitoring, reset generation, watchdog safety, and nonvolatile storage into a single chip - targeting cost-sensitive, space-constrained embedded systems needing guaranteed boot integrity.

FAQ

What is the factory-programmed VTRIP voltage for X5163S8ZT1?

The X5163S8ZT1 is the tape-and-reel variant of X5163S8Z-2.7A, which has a factory-set VTRIP range of 2.85V to 3.0V. This threshold is reprogrammable in-system using the VP pulse sequence on SCK and SI pins per FN8128 Rev 4.00 Section 5. The default value is calibrated at 25°C and retains ±25mV repeatability across successive programming cycles.

Does X5163S8ZT1 support both active-low and active-high reset outputs?

No, X5163S8ZT1 provides only an active-low RESET output (pin 7). The datasheet identifies X5165 variants as the active-high counterparts. X5163S8ZT1's RESET/RESET pin is open-drain and requires an external pull-up resistor; its assertion behavior is identical across all operating conditions including power-up, brownout, and watchdog timeout events.

How does the watchdog timer in X5163S8ZT1 interact with the CS/WDI pin?

The CS/WDI pin (pin 1) serves dual purpose: chip select for SPI and watchdog input. A HIGH-to-LOW transition on this pin resets the watchdog timer. If no such transition occurs within the selected timeout interval (200ms/600ms/1.4s), X5163S8ZT1 asserts RESET. The timeout is set via nonvolatile WD0/WD1 bits and remains unchanged across power cycles - ensuring consistent watchdog behavior without firmware reinitialization.

Can the EEPROM in X5163S8ZT1 be written during normal microcontroller operation?

Yes, the 16Kbit SPI EEPROM in X5163S8ZT1 supports concurrent read/write operations: while a write cycle executes (typ. 5ms), the Status Register remains readable to monitor the WIP bit. Writes require WREN instruction followed by WRITE opcode, 16-bit address, and data. Page writes (up to 32 bytes) minimize bus occupancy, and Block Lock™ protection prevents accidental overwrites of critical sectors.

What is the minimum VCC required for X5163S8ZT1 to assert a valid RESET signal?

X5163S8ZT1 asserts RESET valid down to VCC = 1V, as confirmed in FN8128 Rev 4.00 Section 4 ("Principles Of Operation") and Table 4 ("POWER-UP AND POWER-DOWN TIMING"). This ensures deterministic reset initiation even during slow power ramps or deep brownout conditions - a key differentiator versus supervisors requiring ≥2.0V for reset assertion.