Renesas X5083S8IZ

Overview

X5083S8IZ from Intersil is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 8Kbit SPI EEPROM in a single SOIC-8 package. It provides active-low open-drain RESET output, supports 3.3 MHz SPI interface, offers four factory-standard VTRIP thresholds (including 4.63V ±2.5% for this variant), and enables reprogrammable reset voltage down to 2.0V. It is used in industrial process controllers requiring reliable brownout protection and nonvolatile parameter storage.

For engineers reviewing the X5083S8IZ datasheet, X5083S8IZ pinout, X5083S8IZ application, or X5083S8IZ equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, selectable watchdog timeout (200 ms / 600 ms / 1.4 s / disabled), block-lock EEPROM protection, <50 µA standby current with watchdog enabled, and compatibility with standard SPI modes 0,0 and 1,1.

Technical Context

The X5083S8IZ implements a dual-function CS/WDI pin that serves both as chip select for SPI communication and as watchdog input-requiring a HIGH-to-LOW transition to reset the timer. Its internal POR circuit asserts RESET at VCC ≥ 1V and holds it active for ≥200 ms after VCC exceeds the programmed VTRIP threshold.

Reset assertion occurs under three independent conditions: power-up (with tPURST = 200 ms typ), VCC falling below VTRIP (with hysteresis and 250 ms release delay), or watchdog timeout (configurable via nonvolatile WD0/WD1 bits). The 8Kbit EEPROM uses Intersil's Block Lock™ architecture, supporting page write (16-byte) and 5 ms typical write cycle time.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (RoHS-compliant, M8.15E package drawing), body width 3.9 mm, lead pitch 1.27 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6361KA29+T and STM802LSD-46F, the X5083S8IZ uniquely combines field-programmable VTRIP, 8Kbit block-lock EEPROM, and industrial temperature range-making it optimal for embedded systems demanding both reliability and field-serviceable calibration storage.

Availability

X5083S8IZ is available at Aetrix Electronics and suitable for industrial process controllers, network routers, set-top boxes, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X5083S8IZ 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 Corporation is a leader in precision analog and power management ICs, acquired by Renesas Electronics in 2017. Its products serve industrial, infrastructure, and high-reliability embedded markets.

The X5083S8IZ belongs to Intersil's CPU Supervisor family, designed specifically to reduce system complexity in microcontroller-based equipment by merging reset, watchdog, voltage monitoring, and nonvolatile storage into one robust, field-configurable device.

FAQ

What is the factory-default VTRIP voltage for X5083S8IZ?

The X5083S8IZ is shipped with a factory-default VTRIP of 4.63V ±2.5%, corresponding to the "-4.5A" suffix in its ordering code. This threshold is nonvolatile and remains stable over temperature and time unless explicitly reprogrammed using the VP = 15–18V procedure described in the FN8127 datasheet. The X5083S8IZ maintains this setting across power cycles without firmware intervention.

Can the watchdog timeout of X5083S8IZ be changed dynamically during runtime?

Yes-the watchdog timeout of X5083S8IZ can be changed dynamically during runtime by writing to the status register (WRSR instruction) to modify the WD0 and WD1 bits. The new timeout takes effect after the next SPI command or power cycle. The X5083S8IZ retains the selected timeout value in nonvolatile memory, so it persists across power loss without requiring reconfiguration by the host MCU.

Does X5083S8IZ support SPI Mode 0,1 or Mode 1,0?

No-X5083S8IZ supports only SPI Modes 0,0 (CPOL = 0, CPHA = 0) and 1,1 (CPOL = 1, CPHA = 1), as explicitly stated in the Features section of the FN8127 datasheet. It does not support Mode 0,1 or Mode 1,0. The X5083S8IZ requires the clock polarity and phase to match these two modes for correct opcode decoding, address latching, and data shifting on SI/SO pins.

How is EEPROM write protection implemented in X5083S8IZ?

X5083S8IZ implements dual-layer EEPROM write protection: hardware-level via the dedicated WP pin (LOW disables all writes), and software-level via the Write Enable Latch (WEL), which must be set with WREN before any write operation. Additionally, Block Lock™ allows permanent or temporary locking of memory regions (e.g., first page, upper quadrant) via status register configuration. All protections remain active even during low-VCC conditions.

What is the minimum VCC required for X5083S8IZ to assert a valid RESET signal?

The X5083S8IZ asserts a valid RESET signal down to VCC = 1V, as confirmed in the datasheet's "Low VCC detection and reset assertion" feature list and Power-on Reset section. At VCC ≥ 1V, the internal POR circuit activates and holds RESET active until VCC rises above the VTRIP threshold and stabilizes for ≥200 ms. Below 1V, RESET behavior is unspecified, and the X5083S8IZ enters an undefined state.