Renesas X5043PZ

Overview

X5043PZ from Intersil (now Renesas) is a 4K-bit CPU supervisor IC integrating power-on reset, watchdog timer, supply voltage supervision, and SPI EEPROM in a single 8-lead PDIP package. It features 4.63V ±2.5% reset threshold, 1.4s/600ms/200ms selectable watchdog timeout, 3.3MHz SPI interface, and block-lock protected EEPROM with 1M write endurance. Used in desktop computers and network servers for reliable microcontroller startup and data retention.

For engineers reviewing the X5043PZ datasheet, X5043PZ pinout, X5043PZ application, or X5043PZ equivalent, key selection criteria include its active-low RESET output, VTRIP reprogrammability, CS/WDI dual-function pin, and 4.5–5.5V operating range - all critical for brownout protection and firmware recovery in industrial control systems.

Technical Context

The X5043PZ implements a POR circuit that asserts RESET until VCC exceeds 4.63V for 200ms, ensuring stable microprocessor initialization. Its watchdog timer monitors CS/WDI transitions and triggers reset if no high-to-low edge occurs within the selected timeout interval (200ms, 600ms, or 1.4s), with nonvolatile WD0/WD1 bits retaining configuration across power cycles.

Voltage supervision uses an internal comparator with factory-trimmed 4.63V ±2.5% trip point, valid down to 1V VCC. The integrated 512 × 8-bit SPI EEPROM supports page writes (up to 16 bytes), 5ms typical write cycle time, and block lock protection controlled by BL0/BL1 bits in the status register.

Key Specifications

Pinout & Package

Package: 8-lead PDIP (Plastic Dual In-line Package), Pb-free, RoHS compliant, 0°C to +70°C operating temperature range.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX690TSA+ and MCP9808-I/P, the X5043PZ uniquely integrates reset, watchdog, and 4K-bit EEPROM in one 8-pin PDIP package - enabling single-chip system supervision where firmware resilience and parameter persistence are jointly required.

Availability

X5043PZ is available at Aetrix Electronics and suitable for desktop computer motherboards, industrial PLC controllers, network server power management, and battery-powered test instruments requiring stable component supply and long-term obsolescence support.

Supply support for X5043PZ 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 (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in precision analog, power management, and interface ICs for industrial, communications, and computing markets.

The X5043PZ belongs to Intersil's CPU Supervisor family, designed to consolidate power monitoring, reset generation, watchdog protection, and nonvolatile storage into a single SPI-compatible device for resource-constrained embedded systems.

FAQ

What is the reset threshold voltage for X5043PZ?

The X5043PZ has a factory-programmed reset threshold of 4.63V ±2.5%, specified for operation across 4.5–5.5V VCC. This value is reprogrammable using a 15–18V pulse on the WP pin and SPI command sequence per FN8126 Rev 3.00 Section 6. The reset signal remains active until VCC exceeds this threshold for 200ms.

Does X5043PZ support SPI clock speeds above 3.3MHz?

No, the X5043PZ is rated for a maximum SPI clock frequency of 3.3MHz under all operating conditions, as confirmed in the AC Electrical Specifications table (Page 14, FN8126 Rev 3.00). Exceeding this limit may cause read/write corruption or status register misreads due to internal timing constraints.

How does the watchdog timer function on X5043PZ?

The X5043PZ watchdog timer monitors the CS/WDI pin: a high-to-low transition resets the timer. If no transition occurs within the selected timeout (200ms, 600ms, or 1.4s), RESET is asserted. Timeout selection is stored in nonvolatile WD0/WD1 bits, retaining setting across power cycles without host intervention.

Can X5043PZ EEPROM be partially write-protected?

Yes, the X5043PZ supports partial EEPROM protection via Block Lock™ bits BL0/BL1 in the status register. These nonvolatile bits allow locking 0%, 25%, 50%, or 100% of the 512×8-bit array - for example, protecting bootloader configuration while permitting runtime logging in unprotected pages.

What package type is used for X5043PZ?

The X5043PZ is supplied in an 8-lead PDIP (Plastic Dual In-line Package) with Pb-free finish, rated for 0°C to +70°C operation. Pinout matches industry-standard 8-pin DIP footprints, enabling drop-in replacement in legacy designs originally using similar supervisors like DS1233 or MAX809.