Renesas X5325S8IZ-2.7T1

Overview

X5325S8IZ-2.7T1 from Intersil is a CPU supervisor IC with integrated 32kbit SPI EEPROM, combining power-on reset control, watchdog timer, supply voltage supervision, and block-lock protected memory in a single 8-lead SOIC package. It operates from 2.7V to 5.5V, features programmable VTRIP thresholds (2.55–2.7V nominal), selectable watchdog timeout (200ms/600ms/1.4s), and supports 2MHz SPI communication. It is used in industrial embedded systems requiring reliable brown-out protection and nonvolatile configuration storage.

For engineers reviewing the X5325S8IZ-2.7T1 datasheet, X5325S8IZ-2.7T1 pinout, X5325S8IZ-2.7T1 application, or X5325S8IZ-2.7T1 equivalent, this device delivers verified low-voltage reset assertion down to 1V, volatile flag identification of reset cause (watchdog vs. supply fault), and in-circuit reprogrammable VTRIP for precision system-level power monitoring.

Technical Context

The X5325S8IZ-2.7T1 integrates a dedicated low-VCC detection comparator with hysteresis (20mV), a user-selectable watchdog timer controlled by nonvolatile WD0/WD1 bits, and a serial peripheral interface compliant with SPI modes 0,0 and 1,1. Its RESET/RESET output is active-high and open-drain, asserted during power-up until VCC exceeds the programmed trip point for 200ms.

It implements Intersil's Block Lock™ protection architecture, enabling hardware- and software-controlled write protection of 0%, 25%, 50%, or 100% of the 4KB EEPROM array. The device includes a volatile status register with WIP and WEL bits, and supports page-write operations with self-timed 10ms typical write cycles.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS-compliant), 3.9mm × 4.9mm body, 1.27mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6369KA27+T and STM6803TZQF6F, the X5325S8IZ-2.7T1 uniquely combines field-programmable VTRIP, 32kbit Block Lock™ EEPROM, and industrial temperature range in one SOIC-8 package - eliminating design compromises between precision supervision and nonvolatile data retention.

Availability

X5325S8IZ-2.7T1 is available at Aetrix Electronics and suitable for industrial automation, medical device, smart metering, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X5325S8IZ-2.7T1 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) designs high-performance analog and mixed-signal ICs focused on power management, precision sensing, and system supervision for industrial and automotive markets.

The X5325 product line delivers integrated CPU supervisors with EEPROM for embedded systems needing coordinated power monitoring, watchdog safety, and secure configuration storage - targeting cost-sensitive, space-constrained applications.

FAQ

What is the factory default VTRIP setting for X5325S8IZ-2.7T1?

The X5325S8IZ-2.7T1 ships with a factory-default VTRIP of 2.55V to 2.7V (typical 2.63V), corresponding to the "-2.7" suffix designation. This threshold is reprogrammable in-system using a 15–18V programming pulse on SCK and SI pins per the VTRIP Set procedure in FN8131 Rev 3.00. No external programming hardware is required - only controlled voltage application during power-up.

Does X5325S8IZ-2.7T1 support both active-low and active-high reset outputs?

No - the X5325S8IZ-2.7T1 provides an active-high RESET/RESET output only (pin 8). The "X5325" designation explicitly indicates active-high reset logic, distinguishing it from the X5323 series which offers active-low output. The output is open-drain, requiring an external pull-up resistor to VCC or another logic rail to establish valid HIGH level.

How is the watchdog timeout period selected on X5325S8IZ-2.7T1?

The watchdog timeout on X5325S8IZ-2.7T1 is selected via two nonvolatile bits (WD0 and WD1) in the status register, programmed using the WRSR instruction. Valid combinations are: WD1=1,WD0=0 → 200ms; WD1=0,WD0=1 → 600ms; WD1=0,WD0=0 → 1.4s; WD1=1,WD0=1 → disabled (factory default). These settings persist across power cycles and are unaffected by WP pin state unless WPEN is set.

Can the EEPROM in X5325S8IZ-2.7T1 be fully protected against writes?

Yes - the X5325S8IZ-2.7T1 supports full EEPROM array protection using Block Lock™. Setting BL1=1 and BL0=1 in the status register (via WRSR) locks the entire 4KB memory (addresses $0000–$0FFF) against writes while allowing reads. Protection persists until BL bits are rewritten, and can be reinforced with WP pin + WPEN bit to prevent accidental status register modification.

What is the maximum operating temperature range for X5325S8IZ-2.7T1?

The X5325S8IZ-2.7T1 is rated for industrial temperature operation from –40°C to +85°C, as confirmed by the "I" suffix in the part number and specified in the Ordering Information table on page 2 of FN8131 Rev 3.00. This range applies to all electrical specifications including VTRIP accuracy, watchdog timing, and EEPROM write endurance.