Renesas X5323S8I-2.7A

Overview

X5323S8I-2.7A 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 nonvolatile memory in a single 8-lead SOIC package. It operates from 2.7V to 5.5V, features a factory-programmed 2.85–3.0V reset threshold, supports 2MHz SPI communication, and delivers <20µA standby current with watchdog enabled at 3.6V.

For engineers reviewing the X5323S8I-2.7A datasheet, X5323S8I-2.7A pinout, X5323S8I-2.7A application, or X5323S8I-2.7A equivalent, this device serves as a system-level reliability enhancer for microcontroller-based embedded systems requiring deterministic power-up sequencing, brown-out protection, fail-safe watchdog recovery, and configuration storage with hardware write protection.

Technical Context

The X5323S8I-2.7A integrates four tightly coupled functions: a precision low-voltage detector with reprogrammable VTRIP (2.85–3.0V nominal), a selectable watchdog timer with three timeout options (200ms/600ms/1.4s), a power-on reset generator asserting RESET/RESET down to VCC = 1V, and a 4KB SPI EEPROM organized as 512 × 8 with Block Lock™ protection. All logic is synchronized to the same internal clock domain and shares common status register bits (WD0/WD1, BL0/BL1, WPEN).

Its CS/WDI dual-function pin enables both chip selection and watchdog kick signaling, while the WP pin-combined with the nonvolatile WPEN bit-enables in-circuit programmable ROM mode to lock watchdog and memory protection settings. The device uses Direct Write™ EEPROM cells rated for 100,000 write cycles and 100-year data retention.

Key Specifications

Pinout & Package

8-lead SOIC package (3.9mm × 4.9mm, 1.27mm pitch), RoHS-compliant, matte tin e3 termination. Pin 1 marked by notch or dot; top-side marking includes "X5323 ZAP" per ordering table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and STM6313ZWD2F6F, the X5323S8I-2.7A uniquely combines field-reprogrammable VTRIP, 32kbit Block Lock™ EEPROM, and ultra-low watchdog standby current in a single 8-pin SOIC - eliminating external components while enabling adaptive voltage supervision and secure configuration storage.

Availability

X5323S8I-2.7A is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for X5323S8I-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 (now part of Renesas Electronics) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, computing, and communications markets.

The X5323 family was designed to consolidate system-level supervision and nonvolatile storage into a single chip for microcontroller-based embedded systems demanding high reliability, low power, and field-configurable voltage thresholds.

FAQ

What is the factory-default reset threshold voltage for X5323S8I-2.7A?

The X5323S8I-2.7A ships with a factory-programmed VTRIP range of 2.85V to 3.0V (typical 2.92V), optimized for 3.3V systems. This threshold is stored in nonvolatile circuitry and remains stable over temperature and time unless explicitly reprogrammed using the VP-based sequence defined in the datasheet.

Does X5323S8I-2.7A support SPI mode 0,0 and mode 1,1 exclusively?

Yes, X5323S8I-2.7A supports only SPI clock polarity (CPOL) and phase (CPHA) combinations 0,0 and 1,1 - meaning data is sampled on the first clock edge and shifted out on the opposite edge. It does not support mode 0,1 or 1,0, and attempting those configurations will result in communication failure.

How is the watchdog timer enabled and configured on X5323S8I-2.7A?

The watchdog timer on X5323S8I-2.7A is disabled at power-up (WD1=1, WD0=1). To enable it, the host MCU must issue a WRSR instruction to set WD0 and WD1 to one of three active combinations: 10 (200ms), 01 (600ms), or 00 (1.4s). Once written, these bits persist across power cycles unless rewritten or locked via WP/WPEN.

Can the EEPROM in X5323S8I-2.7A be fully protected against writes?

Yes, X5323S8I-2.7A supports full-array EEPROM protection via the nonvolatile BL1/BL0 bits. When BL1=1 and BL0=1, the entire 32kbit array (addresses $0000–$0FFF) is write-protected while remaining readable. This setting persists through power cycles and can only be changed after disabling WPEN or toggling the WP pin state.

What is the minimum VCC required for X5323S8I-2.7A to assert a valid RESET/RESET signal?

X5323S8I-2.7A asserts RESET/RESET down to VCC = 1V, ensuring the microcontroller remains held during deep brown-out conditions. The reset signal remains active until VCC rises above the programmed VTRIP (2.85–3.0V) and stabilizes for 200ms, providing robust power-fail immunity.