Renesas X5323S8IZ-2.7

Overview

X5323S8IZ-2.7 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 a factory-programmed 2.55V–2.7V VTRIP threshold, supports -40°C to +85°C industrial temperature range, and delivers <1µA standby current with watchdog disabled - ideal for battery-backed microcontroller systems requiring reliable brown-out protection and nonvolatile configuration storage.

For engineers reviewing the X5323S8IZ-2.7 datasheet, X5323S8IZ-2.7 pinout, X5323S8IZ-2.7 application, or X5323S8IZ-2.7 equivalent, this device serves as a drop-in replacement for legacy X5323PIZ-2.7 and X5323PZ-2.7 variants, offering verified VTRIP reprogrammability, 2MHz SPI interface compliance, and deterministic 200ms power-up reset timeout - critical for embedded firmware initialization integrity and system-level fault recovery design.

Technical Context

The X5323S8IZ-2.7 implements a dual-function CS/WDI pin for chip select and watchdog input, with a volatile flag bit distinguishing watchdog-induced vs. low-voltage resets. Its internal architecture integrates a precision low-VCC detection comparator (with 20mV hysteresis), a programmable watchdog timer (200ms/600ms/1.4s timeout options), and an 8-bit status register controlling block lock protection and write-enable state.

EEPROM functionality uses Intersil's Direct Write™ cell technology (100k write cycles, 100-year data retention) and supports 32-byte page writes with self-timed 10ms typical write cycles. The device powers up with watchdog disabled (WD1=1, WD0=1) and block lock set to 'none' (BL1=0, BL0=0), ensuring safe default operation before firmware configuration.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, 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 EEPROM applications.

Compared with MAX6361KA29+T and STM6803RWDY6F, the X5323S8IZ-2.7 uniquely combines field-reprogrammable VTRIP, 32kbit EEPROM, and industrial temperature support - making it the only option enabling both adaptive brown-out response and robust firmware-parameter persistence in a single component.

Availability

X5323S8IZ-2.7 is available at Aetrix Electronics and suitable for industrial automation, medical device certification, and automotive body electronics requiring stable component supply across extended lifecycle commitments.

Supply support for X5323S8IZ-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

Intersil (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X5323 product line was designed specifically for embedded systems needing integrated power supervision and nonvolatile configuration storage - targeting cost-sensitive, space-constrained applications where discrete supervisors and EEPROMs would increase BOM count and PCB area.

FAQ

What is the factory-default VTRIP voltage for X5323S8IZ-2.7?

The X5323S8IZ-2.7 ships with a factory-programmed VTRIP threshold of 2.55V to 2.7V (typical 2.63V), optimized for 2.7V–5.5V supply operation. This value is confirmed in the Ordering Information table on page 2 of FN8131 Rev 3.00 and applies specifically to the -2.7 suffix variant. The X5323S8IZ-2.7 does not require external configuration to achieve this trip point.

Can the watchdog timer timeout be changed after soldering the X5323S8IZ-2.7 onto a PCB?

Yes - the watchdog timeout on the X5323S8IZ-2.7 is controlled by nonvolatile WD0 and WD1 bits in the status register, which can be reprogrammed in-circuit using the WRSR instruction. Once written, the selected timeout (200ms, 600ms, or 1.4s) persists across power cycles and does not require physical access to the device.

Does X5323S8IZ-2.7 support SPI Mode 0,0 and Mode 1,1 only?

Yes - the X5323S8IZ-2.7 explicitly supports only SPI clock polarity (CPOL) and phase (CPHA) combinations 0,0 and 1,1, as stated in the Features section on page 1 of FN8131. It does not support Mode 0,1 or Mode 1,0. Microcontroller SPI peripherals must be configured accordingly to ensure correct opcode and data sampling.

How is EEPROM write protection implemented on X5323S8IZ-2.7?

X5323S8IZ-2.7 implements EEPROM write protection via three mechanisms: (1) software-controlled Write Enable Latch (WEL) requiring WREN instruction before writes; (2) nonvolatile Block Lock™ bits (BL0/BL1) protecting 0%, 25%, 50%, or 100% of the array; and (3) hardware WP pin + WPEN bit enabling in-circuit programmable ROM mode to lock status register writes permanently.

Is X5323S8IZ-2.7 pin-compatible with earlier PDIP versions like X5323PIZ-2.7?

No - X5323S8IZ-2.7 uses an 8-lead SOIC package, while X5323PIZ-2.7 uses an 8-lead PDIP package. Although both share identical pin numbering and function mapping (CS/WDI, SO, WP, VSS, SI, SCK, RESET/RESET, VCC), the physical land patterns, thermal characteristics, and soldering profiles differ. Board redesign is required for package substitution.