Renesas X5163S8-2.7

Overview

X5163S8-2.7 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 provides active-low RESET output, supports 2.7V–5.5V VCC operation, features programmable 2.55V–2.7V reset threshold, and delivers <50µA standby current with watchdog enabled - used in microcontroller-based embedded systems requiring reliable boot sequencing and nonvolatile configuration storage.

For engineers reviewing the X5163S8-2.7 datasheet, X5163S8-2.7 pinout, X5163S8-2.7 application, or X5163S8-2.7 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in FN8128 Rev 4.00 and official Renesas documentation for design-in confidence.

Technical Context

The X5163S8-2.7 implements a dual-function reset architecture: power-on reset activates at 1V and holds RESET/RESET active for ≥100ms until VCC exceeds 2.55V and stabilizes for 200ms; low-voltage detection asserts RESET/RESET when VCC falls below the factory-set 2.55V trip point (±0.05V), with hysteresis of 20mV. Its watchdog timer offers three selectable timeout intervals (200ms/600ms/1.4s) via nonvolatile WD0/WD1 bits and resets on CS/WDI edge absence.

Internally, it integrates a 16Kbit (2K × 8) SPI EEPROM with Block Lock™ protection, supporting 2MHz SPI Mode 0/3, 32-byte page writes, and self-timed 5ms typical write cycles. The device uses Direct Write™ memory cells rated for 100,000 write cycles and 100-year data retention, with write enable latch (WEL), status register access (RDSR/WRSR), and in-circuit programmable ROM mode controlled by WPEN and WP pin.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (MDP0027), RoHS-compliant, body width 3.9mm, lead pitch 1.27mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with X5163S8-2.7, MAX6361KA29+T and STM6315SW29D6F offer fixed 2.93V reset thresholds and matching EEPROM capacity but lack on-the-fly VTRIP reprogramming - making X5163S8-2.7 uniquely suited for designs requiring post-production brownout threshold calibration or multi-voltage platform reuse.

Availability

X5163S8-2.7 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 integrity, and field-programmable reset thresholds.

Supply support for X5163S8-2.7 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

Renesas Electronics (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, and power management solutions for industrial, automotive, and IoT applications.

The X5163S8-2.7 belongs to Renesas' legacy CPU supervisor family designed for embedded systems needing integrated reset, watchdog, and nonvolatile memory - targeting cost-sensitive, space-constrained designs where reliability and configurability are critical.

FAQ

What is the factory-programmed VTRIP voltage for X5163S8-2.7?

The X5163S8-2.7 is factory-programmed with a nominal VTRIP of 2.55V, with a tolerance of ±0.05V (2.55V–2.7V range). This threshold is specifically optimized for 2.7V system brownout detection and is confirmed in the Ordering Information table on Page 2 of FN8128 Rev 4.00. The value remains stable over temperature and time unless reprogrammed using the VP pulse sequence.

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

No - X5163S8-2.7 provides only an active-low RESET/RESET output (open-drain). The "X5165" variant in the same datasheet family offers active-high reset, but X5163S8-2.7 is strictly active-low. This is explicitly defined in the Ordering Information table and Pin Description section (Page 4), where RESET/RESET is labeled as "active LOW" for X5163 devices.

Can the watchdog timer on X5163S8-2.7 be disabled entirely?

Yes - the watchdog timer on X5163S8-2.7 can be fully disabled by setting WD1=WD0=1 in the Status Register via the WRSR instruction. When disabled, the timer no longer monitors CS/WDI transitions and will not assert RESET/RESET due to timeout. This configuration persists across power cycles as the WD bits are nonvolatile.

What EEPROM protection modes does X5163S8-2.7 support?

X5163S8-2.7 supports four Block Lock™ protection levels via BL0/BL1 bits: unprotected (0% locked), quarter-array (25% locked starting at $0600), half-array (50% locked starting at $0400), or full-array (100% locked). Protection is enforced at the hardware level - write attempts to locked regions are ignored, and read access remains unrestricted.

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

Yes - X5163S8-2.7 shares identical 8-lead SOIC pinout and electrical behavior with all X5163/X5165 variants in the same package (e.g., X5163S8Z, X5163S8IZ-2.7). Pin functions, timing, and SPI protocol are consistent across the family; only VTRIP threshold, temperature grade, and reset polarity differ between part numbers.