X5325S8IZ-4.5A - CPU Supervisor with 32K SPI EEPROM, 4.5V | Renesas
部品番号: X5325S8IZ-4.5A ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $6.4 | $6.40 |
| 10 | $5.78 | $57.80 |
| 100 | $5.12 | $512.00 |
| 500 | $4.62 | $2,310.00 |
| 1,000 | $4.15 | $4,150.00 |
X5325S8IZ-4.5A 概要
A CPU Supervisor (also called a voltage supervisor, reset IC, or power-supply monitor) is a mixed-signal IC that safeguards a microcontroller, microprocessor, or DSP by monitoring its supply rail and asserting a reset during brown-out, power-up, and power-down events. This category sits within the PMIC (Power Management IC) hierarchy: supervisor -> PMIC -> power management -> semiconductor. By combining an EEPROM with the supervisor, the X5325 reduces part count, board area, and BOM cost in designs that otherwise need a standalone EEPROM for configuration, calibration, or parameter storage.
Key features include a precision VCC voltage detector with 4.5 V nominal trip point, a programmable watchdog timer with selectable time-out, an open-drain / open-collector reset output, SPI (Serial Peripheral Interface) bus access up to 5 MHz for the 32 kbit (4 kbyte) EEPROM, and software-controllable block-lock protection that prevents accidental writes to protected memory regions. The Z suffix indicates the Pb-free (lead-free) finish and the I suffix denotes the industrial temperature grade (-40 C to +85 C).
Internally, the X5325S8IZ-4.5a pairs an analog voltage reference and comparator (for VCC monitoring) with a state machine that drives the reset pin and watchdog logic, alongside a separate SPI slave with embedded EEPROM. The 32 kbit EEPROM uses a 4 kbyte organization and supports page-write mode for efficient parameter updates. Block-lock protection prevents rogue firmware from corrupting calibration constants stored in protected sectors, which is critical in safety-relevant designs such as industrial PLCs and appliance controllers.
Typical applications include 8051 / ARM Cortex-M0 boot-monitoring in white goods, HVAC controllers, set-top boxes, and any 5 V MCU platform needing tamper-safe parameter storage (e.g., trim settings, serial numbers, runtime hours). The wide VCC tolerance also makes it suitable for 5 V +/-10% industrial 24 V-bus-derived rails. Choose this part when a low-pin-count supervisor plus serial EEPROM in one IC simplifies layout and lowers cost versus a discrete supervisor + standalone EEPROM solution.
When designing with this device, place a 0.1 uF decoupling capacitor close to VCC and keep SPI lines short to prevent ringing at 5 MHz. Reset pull-up resistor selection affects rise time - a 10 kohm to 100 kohm range typically balances current draw with rise-time. For in-system EEPROM writes, ensure VCC remains within the data-retention range or block writes with the watchdog-induced reset.
This page synthesizes distributor pricing, same-family drop-in alternatives, and practical supervisor design notes not found in the standalone manufacturer datasheet alone.
ドロップイン代替品: X5325S8IZ-4.5A — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
X5325S8I-4.5A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
X5325S8IZ-4.5A-T1
✅ ドロップイン📋 参考代替品（カタログ未掲載）
X5325S8Z-4.5A
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
X5325S8IZ-4.5AT1
✅ ドロップイン ⚠️ 仕様未検証📋 参考代替品（カタログ未掲載）
X5323S8IZ-4.5A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
X5325S8IZ-4.5A 仕様
| 機能 | CPU Supervisor with 32 kbit SPI EEPROM |
| Monitored Voltage (VCC trip) | 4.5 V |
| VCC Tolerance | +/-10% |
| Reset Output | Active-high, open-drain (RST) |
| Number of Supervisors | 1 channel |
| Watchdog Timer | Programmable |
| EEPROM Size | 32 kbit (4 kbyte) |
| Serial Interface | SPI |
| Block-Lock Protection | Yes |
| 動作温度範囲 | -40 C to +85 C (industrial) |
| パッケージ | 8-pin SOIC |
| 実装タイプ | Surface Mount |
| Lead-Free (Z suffix) | Yes |
| RoHS ステータス | Compliant |
| Power-On Reset | Yes |
X5325S8IZ-4.5A ピン構成
| ピン 1 | /CS — Chip Select (active low) for SPI bus |
| ピン 2 | SCK — Serial Clock for SPI bus |
| ピン 3 | SI — Serial Input (MOSI) for SPI writes |
| ピン 4 | SO — Serial Output (MISO) for SPI reads |
| ピン 5 | GND — Ground |
| ピン 6 | WP — Write Protect (active low) |
| ピン 7 | RST — Reset output, active-high, open-drain |
| ピン 8 | VCC — Power supply input (5V nominal) |
主な用途
X5325S8IZ-4.5A の用途: 7 件s: Industrial PLC and HVAC Controller MCU Supervision, White Goods and Home Appliance Control Boards, Set-Top Box and Consumer Audio/Video MCU Boot Monitor, Automotive Infotainment Auxiliary Processor Reset, Medical Device Parameter and Calibration Memory, Networking Equipment and Router Boot Supervisor, Smart-Meter and Energy-Monitoring Endpoints.
Industrial PLC and HVAC Controller MCU Supervision
The X5325S8IZ-4.5A is widely deployed in 5 V industrial PLC and HVAC controller boards where a 16-bit or 32-bit MCU requires both brown-out protection and persistent storage for trim values, calibration constants, and runtime counters. The 4.5 V VCC trip threshold matches 5 V +/-10% industrial rails derived from 24 V backplanes, and the 32 kbit SPI EEPROM reliably stores Modbus device addresses, hysteresis coefficients, and cumulative runtime hours across -40 C to +85 C operation. The block-lock protection prevents field firmware from corrupting factory-calibrated sectors, while the watchdog timer recovers the system from a stuck control loop. Placed between the 5 V LDO output and the MCU RESET pin with a 10 kohm pull-up, it adds only ~5 uA quiescent current and saves a separate EEPROM IC.
おすすめ
White Goods and Home Appliance Control Boards
In washing machines, dishwashers, refrigerators, and microwave-oven control boards, the X5325S8IZ-4.5A supervises the 5 V rail powering 8051 or Cortex-M0 MCUs that drive motor inverters and user interfaces. The 32 kbit EEPROM stores wash-cycle programs, user preferences, fault logs, and lifetime counters that must survive brown-outs and power-line transients. The watchdog timer recovers the appliance if the motor-control firmware becomes unresponsive, preventing costly service calls. The SOIC-8 footprint is small enough to fit on densely populated appliance PCBs alongside triac drivers and relay coils, and the industrial temperature grade handles garage and basement installations.
おすすめ
Set-Top Box and Consumer Audio/Video MCU Boot Monitor
Set-top boxes, AV receivers, and Smart-TV controller boards use the X5325S8IZ-4.5A to monitor 5 V standby rails feeding the front-panel MCU, where the 32 kbit SPI EEPROM stores channel presets, parental-control PINs, MAC addresses, and learned IR codes that must persist across power cycles. The 4.5 V trip threshold ensures clean reset assertion before the MCU's internal BOR becomes unpredictable, while the SPI bus can be shared with the main SoC for unified firmware updates. The watchdog timer recovers the system if the front-panel firmware hangs during user interaction, and block-lock protection prevents accidental erasure of factory-set MAC IDs.
おすすめ
Automotive Infotainment Auxiliary Processor Reset
Non-safety automotive infotainment subsystems use the X5325S8IZ-4.5A to monitor 5 V rails feeding auxiliary MCUs that manage climate controls, seat-position memory, and rear-seat entertainment. The 32 kbit EEPROM stores seat-position profiles, radio presets, and per-user climate preferences that must persist for the life of the car. The block-lock protection prevents owner firmware updates from corrupting factory-calibrated sector data, and the watchdog timer recovers from CAN-bus-induced firmware hangs. Although this part is not AEC-Q100 qualified, it is widely used in non-safety automotive body-electronics where industrial temperature grade (-40 C to +85 C) is sufficient.
おすすめ
Medical Device Parameter and Calibration Memory
Non-critical medical devices such as blood-pressure monitors, glucose meters, and portable infusion pumps use the X5325S8IZ-4.5A to supervise 5 V rails powering the main MCU while storing calibration constants, patient history, and battery-cycle counters in the 32 kbit EEPROM. The block-lock protection prevents patient data from being overwritten by field firmware, while the watchdog timer recovers the device if the pump-control firmware hangs. The industrial temperature grade accommodates bedside and portable use cases, and the SOIC-8 footprint fits inside the small form factor required for handheld medical instruments.
おすすめ
Networking Equipment and Router Boot Supervisor
SOHO routers, switches, and small-cell base stations use the X5325S8IZ-4.5A to monitor 5 V rails powering the management-plane MCU that handles status LEDs, console ports, and out-of-band management. The 32 kbit EEPROM stores MAC address tables, default credentials, and factory certificates that must survive brown-outs and firmware-update reboots. The watchdog timer ensures the management plane comes back online even if the main SoC hangs during boot, providing a fail-safe for remote IT management. Block-lock protection prevents the running firmware from erasing factory-set credentials during a failed update.
おすすめ
Smart-Meter and Energy-Monitoring Endpoints
Single-phase smart electricity meters, gas meters, and water-meter endpoints integrate the X5325S8IZ-4.5A to supervise the 5 V rail powering the metering MCU and to store tamper-evident counters, calibration coefficients, and rolling consumption logs in the 32 kbit EEPROM. The 4.5 V VCC trip handles wide-input 24 V-bus-derived rails common in meter baseboards, while the watchdog timer recovers the device if RF-link firmware becomes unresponsive during mesh-network operations. Block-lock protection prevents customer-side firmware from erasing regulatory tamper counters, which is critical for utility billing integrity.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: X5325S8IZ-4.5A — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | X5325S8I-4.5A | X5325S8IZ-4.5A-T1 | X5325S8Z-4.5A | X5323S8IZ-4.5A |
|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| VCC Trip Threshold | 4.5 V | 4.5 V | 4.5 V | 4.5 V | 4.5 V |
| EEPROM Size | 32 kbit (4 kbyte) | 32 kbit (4 kbyte) | 32 kbit (4 kbyte) | 32 kbit (4 kbyte) | 16 kbit (2 kbyte) - 50% smaller |
| Serial Interface | SPI | SPI | SPI | SPI | SPI |
| Reset Polarity | Active-high (RST) | Active-high (RST) | Active-high (RST) | Active-high (RST) | Active-high (RST) |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) - narrower range | -40 C to +85 C (industrial) |
| Lead-Free Plating (Z suffix) | Yes (Z suffix) | No (non-Z, but still RoHS) | Yes (Z suffix + T&R) | Yes (Z suffix) | Yes (Z suffix) |
| Watchdog Timer | Programmable | Programmable | Programmable | Programmable | Programmable |
主な差別化要因
- Integrated supervisor + 32 kbit SPI EEPROM in one SOIC-8 （vs Discrete supervisor + standalone SPI EEPROM (e.g., TPS3808 + 25LC040))
- Block-lock write protection for tamper-safe sectors （vs X5323 (16 kbit, no block-lock))
- 4.5 V trip threshold matches 5 V +/-10% industrial rails （vs X5325S8IZ-2.93A or -3.13A family members)
設計ノート
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VCC pin (pin 8) to suppress high-frequency noise on the 5 V supply rail. Add a 10 uF bulk capacitor if the upstream LDO has more than 50 mm of trace to the X5325S8IZ-4.5A. The reset comparator is sensitive to VCC noise below the trip threshold, so inadequate decoupling can cause spurious resets during transient load steps on the MCU. Tie /CS high when the SPI bus is idle to put the EEPROM in standby.
Keep SPI traces (SCK, SI, SO, /CS) short and length-matched, ideally within 50 mm at 5 MHz SPI clock to avoid signal-integrity issues. Place a series resistor (22-33 ohm) near the SCK source if reflections are observed. Route /RESET (RST, pin 7) away from switching nodes such as DC-DC converters or motor-driver traces to prevent capacitive coupling. Use a 10 kohm pull-up on RST to VCC to set the rise time to approximately 1 ms, which is compatible with most MCU reset input specifications.
Do not float the WP (Write Protect, pin 6) input - tie it to VCC for read-only mode or to GND for full read/write access. Floating WP can enable the internal pull-up but causes indeterminate behavior during power-up. Do not exceed the absolute maximum VCC of 6.0 V. Avoid sharing the SPI /CS line with another device on the bus, as the X5325's EEPROM and supervisor blocks share the same chip-select - a dedicated /CS pin is recommended for each SPI slave on the board.
The SPI bus operates up to 5 MHz at VCC = 5 V. At lower VCC (4.5 V), the maximum SPI clock is reduced to approximately 3 MHz per the Renesas X5323/X5325 datasheet AC characteristics table. If your MCU runs from a 3.3 V rail and the X5325S8IZ-4.5A is powered from 5 V, a level shifter is required on SCK, SI, and /CS (SO output is open-drain-style 5 V tolerant in many MCUs but verify with the MCU datasheet).
コンプライアンス情報
Z suffix denotes lead-free Pb-free terminal plating per Renesas material declarations. RoHS and REACH compliant. Not AEC-Q100 qualified; for automotive safety applications use an AEC-Q100 supervisor like the TPS3808G50QDBVRQ1.
