My Inquiry
My Account
Renesas X4045PI-2.7
- Part No.:
- X4045PI-2.7
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
X4045PI-2.7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:869
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
X4045PI-2.7 from Intersil (now Renesas) is a CPU supervisor IC integrating power-on reset control, watchdog timer, supply voltage supervision, and 4kbit serial EEPROM in a single 8-pin PDIP package. It features active-high RESET output, 2.7–5.5V operation, 2.55–2.7V reset threshold, and I²C-compatible 400kHz 2-wire interface - deployed in industrial microcontroller systems requiring reliable brownout protection and nonvolatile configuration storage.
For engineers reviewing the X4045PI-2.7 datasheet, X4045PI-2.7 pinout, X4045PI-2.7 application, or X4045PI-2.7 equivalent, key selection considerations include its active-high reset assertion, programmable VTRIP down to 2.55V, block-lock EEPROM protection, watchdog timeout options (200ms/600ms/1.4s), and compatibility with legacy 8-pin through-hole PCB layouts.
Technical Context
The X4045PI-2.7 implements a dual-function supervisory architecture: its low-VCC detection circuit asserts RESET when VCC drops below 2.55–2.7V and holds it active until VCC rises above threshold for ≥200ms; simultaneously, its watchdog timer monitors SDA/SCL activity and triggers RESET if no valid I²C transaction occurs within the selected timeout window.
Its EEPROM subsystem uses Intersil's Direct Write™ cell technology (1M write cycles, 100-year data retention), supports 16-byte page writes with self-timed 5ms typical write cycle, and enforces hardware write protection via WP pin and nonvolatile BP2–BP0 bits controlling lock granularity from 16 bytes to full array.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Polarity | Active-high open-drain output - requires external pull-up; asserts during power-up, brownout, or watchdog timeout. |
| VCC Operating Range | 2.7V to 5.5V - supports single-supply operation across 3.3V and 5V logic domains. |
| VTRIP Threshold | 2.55V to 2.7V - factory-set for 2.7V systems; reprogrammable via high-voltage sequence on WP pin. |
| Watchdog Timeout | Selectable 200ms / 600ms / 1.4s - configured via nonvolatile WD1/WD0 bits; disabled by default. |
| EEPROM Capacity | 4kbit (512 × 8) - organized as 16-byte pages; supports byte and page write modes. |
| I²C Interface Speed | Up to 400kHz - compatible with standard-mode I²C buses; SDA/SCL pins are open-drain with internal input buffers always active. |
| Standby Current | <1µA with watchdog disabled - enables ultra-low-power monitoring in battery-backed systems. |
Pinout & Package
Package: 8-pin PDIP (Plastic Dual In-line Package), 0.300" width, RoHS-compliant Pb-free plus anneal finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | NC | No internal connection - must be left unconnected; not bonded internally. |
| 3 | RESET | Active-high open-drain reset output - asserted during power-up (250ms), brownout (VCC < VTRIP), or watchdog timeout. |
| 4 | VSS | Ground reference - primary return path for all internal circuits and I/O pins. |
| 5 | SDA | Serial Data bidirectional I/O - open-drain, requires external pull-up; carries address/data/control bits per I²C protocol. |
| 6 | SCL | Serial Clock input - synchronous timing signal for I²C read/write operations; master-generated only. |
| 7 | WP | Write Protect input - HIGH disables all writes (EEPROM + control register); LOW enables write access when WEL/RWEL latched. |
| 8 | VCC | Supply voltage input - powers all internal blocks; range 2.7V–5.5V; also used as reference for VTRIP programming. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Reset Threshold | VTRIP adjustable from 1.7V up to 4.75V using 15–18V pulse on WP pin - enables precise brownout tuning without external components. |
| Block Lock™ EEPROM Protection | Eight protection modes (0–128 bytes, 1/4–full array) controlled by nonvolatile BP2/BP1/BP0 bits - prevents accidental firmware/config corruption during field updates. |
| Self-Timed EEPROM Writes | 5ms typical write cycle time with automatic internal timing - eliminates need for host-side delay management; supports 16-byte page writes. |
| Power-Fail Safe Operation | RESET remains valid down to VCC = 1V and blocks new I²C transactions when VCC < VTRIP - ensures deterministic state recovery after brownout. |
| Low-Power Watchdog Monitoring | Consumes <20µA standby current with watchdog enabled - allows continuous system health monitoring without significant battery drain. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating in factory environments with fluctuating 24VDC-derived 3.3V rails. IC Role / Device Role / Timing Role: X4045PI-2.7 provides power-on reset, brownout detection at 2.6V, and watchdog supervision - ensuring deterministic boot and safe shutdown during line sags. Use Value: Prevents spurious relay actuation or I/O misreads by holding MCU in reset until stable 3.3V is confirmed and oscillator settled. | Use Scenario: Portable ultrasound unit with battery backup and critical calibration data stored in nonvolatile memory. IC Role / Device Role / Timing Role: X4045PI-2.7 stores sensor calibration coefficients in protected EEPROM pages and asserts RESET if main supply drops below 2.65V during imaging. Use Value: Guarantees calibration integrity via Block Lock™ protection and maintains safe state during battery switchover. |
| Energy Metering Module | Automotive Body Control Unit |
Use Scenario: DIN-rail mounted electricity meter with isolated RS-485 interface and tamper-detection logic. IC Role / Device Role / Timing Role: X4045PI-2.7 supervises the metering SoC, detects undervoltage events that could corrupt kWh accumulation registers, and stores tariff tables in EEPROM. Use Value: Enables accurate energy billing by preventing register overwrites during transient dips and preserving tariff data across 10+ year service life. | Use Scenario: 12V automotive body control module managing door locks, lighting, and window motors. IC Role / Device Role / Timing Role: X4045PI-2.7 monitors 5V LDO output feeding the MCU, asserts RESET during cranking-induced 6V dips, and stores user preference settings in EEPROM. Use Value: Avoids erratic behavior (e.g., unintended window movement) by enforcing clean reset and retaining settings through ignition cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CPU supervisor with EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6816EPA+ | Single-function reset supervisor (no EEPROM); 2.63V fixed VTRIP; 8-pin PDIP; no watchdog or I²C interface. | Requires external EEPROM and separate watchdog IC - increases BOM count and board area. | Choose when only basic reset supervision is needed and EEPROM is already provided elsewhere in design. |
| STM8T142M6U6 | Integrated 8-bit MCU with built-in reset supervisor, watchdog, and 4KB flash (not EEPROM); QFN32 package; 2.95–5.5V operation. | Replaces discrete supervisor + MCU combo; requires firmware development and layout redesign. | Choose for new designs where programmability and integrated processing outweigh cost and footprint of discrete solution. |
Compared with MAX6816EPA+, X4045PI-2.7 reduces component count by integrating EEPROM and watchdog; compared with STM8T142M6U6, it avoids MCU qualification overhead and supports drop-in replacement in legacy PDIP-based systems.
Availability
X4045PI-2.7 is available at Aetrix Electronics and suitable for industrial control, medical instrumentation, energy metering, and automotive body electronics requiring stable component supply and long-term obsolescence support.
Supply support for X4045PI-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 Corporation, now part of Renesas Electronics, is a semiconductor company specializing in precision analog, power management, and interface solutions for industrial, communications, and computing markets.
The X4045 family was designed to consolidate power supervision, system monitoring, and nonvolatile storage into one IC - targeting cost-sensitive, space-constrained embedded systems needing high reliability without software intervention.
FAQ
What is the reset output polarity and drive type of the X4045PI-2.7?
The X4045PI-2.7 features an active-high open-drain RESET output (Pin 3). It requires an external pull-up resistor to VCC and asserts HIGH during power-up (for 250ms), brownout (when VCC falls below 2.55–2.7V), or watchdog timeout. This matches legacy 5V TTL logic levels and simplifies interface with MCUs lacking dedicated reset inputs.
Can the reset threshold voltage of the X4045PI-2.7 be adjusted, and how?
Yes, the X4045PI-2.7's VTRIP threshold is factory-set to 2.55–2.7V but can be reprogrammed between 1.7V and 4.75V using a 15–18V pulse applied to the WP pin (Pin 7) while issuing specific I²C commands. The procedure involves a START condition, slave address A0h, byte address 01h, and data byte 00h - documented in the FN8118 datasheet Section "VTRIP Programming".
Does the X4045PI-2.7 support I²C communication, and what are its timing limits?
Yes, the X4045PI-2.7 supports standard-mode I²C communication at up to 400kHz. Its SDA (Pin 5) and SCL (Pin 6) pins conform to I²C electrical specifications: open-drain outputs with internal input buffers always active, requiring external pull-ups. It acknowledges valid slave addresses (1010xxx0 for EEPROM, 1011xxx0 for control register) and supports byte/page writes and random/sequential reads.
How does the watchdog timer in the X4045PI-2.7 operate, and how is its timeout configured?
The X4045PI-2.7 watchdog timer monitors SDA/SCL activity and resets the system if no valid I²C transaction (START–STOP sequence) occurs within the selected interval. Timeout is set via nonvolatile WD1/WD0 bits in the control register: 00=1.4s, 01=600ms, 10=200ms, 11=disabled (default). Configuration requires setting WEL and RWEL latches before writing the control byte.
What EEPROM protection mechanisms does the X4045PI-2.7 provide, and how are they enabled?
The X4045PI-2.7 offers three-tiered EEPROM protection: (1) hardware WP pin (Pin 7) - HIGH disables all writes; (2) Power-up/Power-down circuitry - blocks writes during VCC transitions; (3) Block Lock™ via BP2/BP1/BP0 bits - locks 16-byte to full-array segments. Protection is enabled by programming the control register at address 1FFh after setting WEL and RWEL latches.
X4045PI-2.7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.62V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
X4045PI-2.7 FAQ
1.How can I place an order for X4045PI-2.7 through Aetrix?
Please submit a Request for Quotation (RFQ) for X4045PI-2.7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for X4045PI-2.7 reliable?
The price and inventory of X4045PI-2.7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for X4045PI-2.7 is usually 5 days.
3.What payment methods are accepted for X4045PI-2.7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for X4045PI-2.7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for X4045PI-2.7?
X4045PI-2.7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your X4045PI-2.7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for X4045PI-2.7?
For technical support, including X4045PI-2.7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your X4045PI-2.7 requirements.
6.How does Aetrix verify that X4045PI-2.7 is sourced from the original manufacturer or authorized distributors?
All X4045PI-2.7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that X4045PI-2.7 meets industry standards.
7.What is the process for return or replacement of X4045PI-2.7?
All X4045PI-2.7 units undergo pre-shipment inspection (PSI). If there is an issue with X4045PI-2.7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The X4045PI-2.7 part is unused and in its original packaging.
Return procedure for X4045PI-2.7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
X4045PI-2.7 Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
