Renesas X5045S8IZ-2.7A

Overview

X5045S8IZ-2.7A from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4K-bit SPI EEPROM in an 8-pin SOIC package. It features a 2.85–3.0 V reset threshold, -40°C to +85°C industrial temperature range, and active-low RESET output. It is used in embedded systems requiring reliable power sequencing and nonvolatile configuration storage.

For engineers reviewing the X5045S8IZ-2.7A datasheet, X5045S8IZ-2.7A pinout, X5045S8IZ-2.7A application, or X5045S8IZ-2.7A equivalent, key selection criteria include its programmable VTRIP, 200 ms reset timeout, 3.3 MHz SPI interface, 100,000 write-cycle EEPROM endurance, and watchdog timeout options of 200 ms/600 ms/1.4 s.

Technical Context

The X5045S8IZ-2.7A implements a dual-function CS/WDI pin for chip select and watchdog input, with automatic watchdog reset on falling edge. Its internal power-on reset circuit asserts RESET until VCC exceeds 2.85 V and remains stable for 200 ms.

Voltage supervision uses a precision comparator with factory-trimmed 2.93 V ±2.5% trip point (suffix -2.7A), reprogrammable via high-voltage VP sequence. The 512 × 8-bit EEPROM supports 16-byte page writes, block lock protection (1/4, 1/2, full, or none), and Direct Write™ technology enabling 100-year data retention.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (Pb-free, RoHS compliant), body size 4.9 mm × 3.9 mm × 1.75 mm.

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 MCP9701-E/SN, the X5045S8IZ-2.7A uniquely integrates four functions-reset, watchdog, voltage monitor, and 4K EEPROM-in one industrial-grade SOIC device, enabling single-chip system supervision where reliability, configurability, and long-term data retention are mandatory.

Availability

X5045S8IZ-2.7A is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure equipment, and battery-powered IoT sensors requiring stable component supply across extended product lifecycles.

Supply support for X5045S8IZ-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

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

The X5045 family was designed to consolidate system-level supervision functions into a single IC for cost-sensitive, space-constrained embedded applications requiring high reliability and long-term data integrity.

FAQ

What is the exact reset threshold voltage for X5045S8IZ-2.7A?

The X5045S8IZ-2.7A has a factory-set VTRIP of 2.93 V ±2.5%, corresponding to the "-2.7A" suffix per the FN8126 datasheet ordering table. This threshold is reprogrammable using a 15–18 V programming voltage applied to the WP pin and a specific WREN + write-to-address-01h sequence. The part ships pre-configured and maintains the setting across power cycles.

Does X5045S8IZ-2.7A support both active-low and active-high reset outputs?

No - the X5045S8IZ-2.7A provides only an active-low RESET output (open-drain). The "X5045" designation indicates active-low reset; the "X5043" variant offers active-high. Pin 8 is labeled RESET (not RESET), and the datasheet's electrical specs, timing diagrams, and pin descriptions exclusively reference active-low behavior for this part number.

Can the watchdog timer on X5045S8IZ-2.7A be disabled?

Yes - the watchdog timer on X5045S8IZ-2.7A can be permanently disabled by programming WD0 and WD1 bits in the Status Register to "11" using the WRSR instruction. This setting persists through power cycles. Factory default is disabled (WD0=1, WD1=1), so no action is needed unless previously enabled.

What is the maximum SPI clock frequency supported by X5045S8IZ-2.7A?

The X5045S8IZ-2.7A supports a maximum SPI clock frequency of 3.3 MHz under all operating conditions (2.7–5.5 V VCC), as specified in the AC Electrical Specifications table on page 14 of FN8126 Rev 3.00. This applies to both read and write operations, including status register access and EEPROM page writes.

Is X5045S8IZ-2.7A RoHS compliant and lead-free?

Yes - X5045S8IZ-2.7A is Pb-free plus anneal (RoHS compliant), as confirmed in the Ordering Information table (page 4) and Notes section of FN8126. It uses 100% matte tin plating and Pb-free molding compounds, qualified for both SnPb and Pb-free soldering processes per IPC/JEDEC J-STD-020.