Renesas X5168PI

Overview

X5168PI from Intersil is a CPU supervisor IC with integrated 16Kbit SPI EEPROM, providing power-on reset control, supply voltage supervision (VTRIP = 4.5–4.75 V), and block-lock protected nonvolatile memory in a single 8-lead PDIP package. It asserts active-low RESET during power-up and brownout conditions, supports 2 MHz SPI interface (modes 0,0 and 1,1), and enables in-circuit programmable ROM mode via WP pin and WPEN bit for secure configuration storage in industrial microcontroller systems.

For engineers reviewing the X5168PI datasheet, X5168PI pinout, X5168PI application, or X5168PI equivalent, this device serves as a system-level power integrity and firmware parameter retention solution - particularly where temperature range (-40°C to +85°C), reprogrammable reset threshold, and EEPROM write protection are critical selection criteria.

Technical Context

The X5168PI integrates three synchronized functional blocks: a precision low-VCC detection circuit with factory-set 4.5 V trip point (±125 mV), a power-on reset generator with 200 ms timeout after VCC stabilization, and a CMOS serial EEPROM array organized as 2K × 8 with Direct Write™ cells (100k write cycles, 100-year data retention). All functions operate from a single 4.5–5.5 V supply.

Its SPI interface uses four dedicated pins (CS, SO, SI, SCK) with MSB-first protocol, supporting both byte and 32-byte page writes. The RESET/RESET output is open-drain, active-low, and remains asserted until VCC exceeds VTRIP for ≥200 ms - ensuring deterministic processor initialization across thermal and supply transients.

Key Specifications

Pinout & Package

Package: 8-lead Plastic Dual In-line Package (PDIP), RoHS-compliant Pb-free plus anneal finish, MDP0031 drawing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6900EPA+ and DS1233MZ-5+, the X5168PI uniquely combines reprogrammable reset threshold, integrated 16Kbit EEPROM with block lock, and industrial temperature rating in a through-hole PDIP - delivering higher system-level reliability and reduced component count where configuration persistence and supply monitoring are co-located.

Availability

X5168PI is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply and long-term lifecycle support.

Supply support for X5168PI 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 power management, precision analog, and mixed-signal ICs for industrial, computing, and communications markets.

The X5168PI belongs to Intersil's CPU Supervisor with EEPROM family, designed to reduce system cost and board area by integrating reset supervision, voltage monitoring, and secure nonvolatile memory into one rugged, temperature-qualified device.

FAQ

What is the reset polarity and output type of the X5168PI?

The X5168PI features an active-low RESET/RESET output implemented as an open-drain driver. It requires an external pull-up resistor to VCC and asserts LOW during power-up, brownout (VCC < 4.5 V), or watchdog timeout. The X5168PI does not provide active-high reset output - that function is handled by the pin-compatible X5169PI variant.

Can the reset threshold voltage of the X5168PI be modified after soldering?

Yes, the X5168PI supports in-system VTRIP reprogramming using a defined VP pulse sequence applied to SCK and SI pins while holding CS and WP HIGH. This allows field adjustment of the reset threshold between 1.7 V and 5.0 V, enabling compensation for power supply tolerance drift or design revisions without replacing the X5168PI.

What EEPROM protection mechanisms does the X5168PI provide?

The X5168PI implements three-tiered EEPROM protection: (1) Power-up/power-down automatic write disable, (2) Software-controlled Block Lock™ via BL0/BL1 bits (protecting 0%, 25%, 50%, or 100% of memory), and (3) Hardware-enabled programmable ROM mode using WP pin and WPEN bit to lock status register writes permanently after manufacturing.

Is the X5168PI pin-compatible with other members of the X5168/X5169 family?

Yes, all X5168 and X5169 variants - including X5168PI, X5168PZ-4.5A, X5169PI-4.5A, and X5168S8I-4.5A - share identical pinouts across PDIP, SOIC, and TSSOP packages. Functionally, X5168PI and X5169PI differ only in reset polarity (active-low vs. active-high), while voltage range and temperature specs remain consistent within each suffix group.

What is the maximum write endurance and data retention of the X5168PI's EEPROM?

The X5168PI's EEPROM is rated for a minimum of 100,000 write/erase cycles and guarantees data retention for at least 100 years under normal operating conditions (≤85°C). These specifications are validated using Intersil's Direct Write™ cell technology and apply to the full 16Kbit array regardless of block lock configuration.