Renesas X5083S8IT1

Overview

X5083S8IT1 from Intersil is a CPU supervisor IC integrating power-on reset control, selectable watchdog timer, supply voltage supervision, and 8Kbit SPI EEPROM with Block Lock™ protection. It operates across 2.7–5.5V, supports 3.3MHz SPI interface, and delivers active-low open-drain RESET output for microcontroller systems requiring reliable boot sequencing and brownout protection in industrial embedded applications.

For engineers reviewing the X5083S8IT1 datasheet, X5083S8IT1 pinout, X5083S8IT1 application, or X5083S8IT1 equivalent, this page provides verified functional identity, confirmed VTRIP thresholds (2.63V/2.93V/4.38V/4.63V), watchdog timeout options (200ms/600ms/1.4s/disabled), EEPROM endurance (100,000 cycles), and SOIC-8 package mapping - all extracted from FN8127 Rev 4.00.

Technical Context

The X5083S8IT1 implements a dual-function reset generator with POR activation at ~1V and low-VCC detection using programmable comparator circuitry tied to five standard VTRIP thresholds. Its watchdog timer uses nonvolatile status register bits (WD1/WD0) to select one of three timeout intervals or disable mode, independent of power cycling.

EEPROM memory is organized as 1024 × 8, accessed via SPI Mode 0,0 and 1,1, with 16-byte page write capability and built-in write enable latch (WREN/WRDI), block lock protection (Q1–Q4, H1, P0, Pn), and direct-write cell technology ensuring 100-year data retention.

Key Specifications

Pinout & Package

Package: 8-lead SOIC (RoHS-compliant, M8.15E footprint).

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-29, X5083S8IT1 uniquely combines field-adjustable VTRIP, 3.3MHz SPI, and 8Kbit Block Lock™ EEPROM in a single SOIC-8 package - reducing component count, enabling precision brownout tuning, and supporting complex configuration storage without layout or firmware changes.

Availability

X5083S8IT1 is available at Aetrix Electronics and suitable for industrial process controllers, network infrastructure routers, set-top box firmware storage, and battery-powered IoT gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for X5083S8IT1 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 provider of precision analog and power management solutions, acquired by Renesas Electronics in 2017; its legacy products serve industrial, communications, and computing markets with high-reliability mixed-signal ICs.

The X5083S8IT1 belongs to Intersil's CPU Supervisor family designed for embedded systems needing integrated reset, watchdog, voltage monitoring, and nonvolatile configuration storage - targeting applications where board space, BOM count, and field-programmable robustness are critical.

FAQ

What is the exact VTRIP voltage for X5083S8IT1, and can it be changed?

The X5083S8IT1 is shipped with a factory-programmed VTRIP threshold - the suffix "-2.7" indicates 2.63V (±2.5%), while "-4.5A" indicates 4.63V (±2.5%). Crucially, the VTRIP voltage is reprogrammable to any value between 2.0V and 5.0V using a 15–18V programming voltage applied to WP and a specific WREN + write-to-address-01h sequence. This allows field calibration without hardware modification.

Does X5083S8IT1 support SPI Mode 0,0 and Mode 1,1, and what is the maximum clock rate?

Yes, X5083S8IT1 supports both SPI Mode 0,0 (CPOL=0, CPHA=0) and Mode 1,1 (CPOL=1, CPHA=1) as explicitly stated in the datasheet Features section. The maximum guaranteed clock frequency is 3.3MHz under recommended operating conditions, enabling fast EEPROM reads and status register polling in time-critical boot sequences.

How does the watchdog timer on X5083S8IT1 behave after power cycling?

The watchdog timer settings on X5083S8IT1 are stored in nonvolatile status register bits (WD1/WD0). These bits retain their programmed state - including timeout interval (200ms/600ms/1.4s) or disabled mode - across full power cycles. No reinitialization is required after power-up; the timer resumes operation using the last configured setting immediately upon VCC stabilization.

What EEPROM protection mechanisms does X5083S8IT1 provide beyond the WP pin?

In addition to hardware write protection via the WP pin, X5083S8IT1 implements Block Lock™ software protection: users can lock any quadrant (Q1–Q4), half-array (H1), or top/bottom page (P0/Pn) using two-byte instructions written to the status register. It also includes a write enable latch (WREN/WRDI) that must be set before each write operation, and automatic disable during low-VCC conditions (

Is X5083S8IT1 pin-compatible with other members of the X5083 family, such as X5083S8Z or X5083S8IZ?

Yes, X5083S8IT1 is pin-compatible with all SOIC-8 variants of the X5083 family, including X5083S8Z and X5083S8IZ. All share identical 8-pin SOIC (M8.15E) footprint, pin numbering, and electrical pin functions - differing only in temperature grade (0°C to 70°C for X5083S8Z vs. –40°C to 85°C for X5083S8IT1), VTRIP option, and tape-and-reel packaging (the "T1" suffix denotes tape-and-reel).