X5043M8I-2.7A - CPU Supervisor w/ 4K SPI EEPROM | Renesas
N.º de pieza: X5043M8I27A ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.55 | $25,50 |
| 100 | $2.18 | $218,00 |
| 500 | $1.92 | $960,00 |
| 1.000 | $1.65 | $1.650,00 |
X5043M8I27A Descripción general
A CPU supervisor (also called a voltage supervisor or reset IC) is a dedicated power-management device that protects a microcontroller, ASIC, or DSP from the brown-out, power-glitch, and firmware-hang conditions that firmware alone cannot detect. Within the broader taxonomy it sits under supervisor and reset IC -> power management IC -> mixed-signal semiconductor. The supervisor's role in a system is to assert a deterministic reset until the supply rail is stable and within tolerance, then continue to monitor VCC and to service a watchdog window that proves the host CPU is still executing valid code.
Key features include low VCC operation down to 1 V to support battery-backup EEPROM write, an internal oscillator that removes the need for an external timing component, hardware block-lock protection for the upper half of the EEPROM array via the WP pin, and selectable watchdog timeout options. The SPI serial interface runs at clock rates up to several MHz, suitable for firmware-parameter storage, board-strapping, and calibration tables. The integrated design reduces board area, BOM count, and software overhead compared with discrete supervisor + EEPROM solutions.
The architecture combines a precision bandgap reference, a comparator chain for VCC monitoring, a watchdog counter clocked from an internal oscillator, and a high-EEPROM cell array accessed through a standard SPI slave port. The I2C-style three-wire interface uses SCLK, SO, SI, and CS, with the WP input gating writes to the protected memory quadrant.
Typical applications include microcontroller reset and parameter storage in industrial controllers, secure boot sequencing in embedded modules, watchdog supervision in motor drives, and EEPROM-backed event logging in metering equipment. Designers choose the X5043M8I-2.7A when a 2.7 V-class reset threshold is required and a small MSOP-8 footprint is mandated.
A key design consideration is decoupling: place a 0.1 uF bypass capacitor close to VCC, and observe the CS setup/hold timings for reliable SPI communication at maximum clock rates. The reset pin is open-drain and requires an external pull-up resistor.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the bare manufacturer datasheet.
Alternativas directas para X5043M8I27A — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
X5043M8I-2.7A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
X5043M8IZ-2.7A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
X5043M8I
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
X5043S8I-2.7A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
X5045M8I-2.7A
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AT25040B-MAHP-T
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
X5043M8I27A Especificaciones
| Función | CPU Supervisor with 4K SPI EEPROM |
| Number of Voltages Monitored | 1 |
| Reset Output | Active Low, Open Drain |
| Reset Timeout | 100 ms minimum |
| Nominal VCC Threshold | 2.7 V (VCC family) |
| Low VCC Operation (EEPROM) | Down to 1.0 V |
| Watchdog Timer | Internal oscillator, selectable timeout |
| Serial Interface | SPI (3-wire SCLK, SO, SI, CS) |
| EEPROM Size | 4 Kbit (512 x 8) |
| Block Lock Protection | Hardware WP pin (upper array) |
| Encapsulado / Carcasa | 8-MSOP / 8-TSSOP, 0.118 in (3.00 mm) width |
| Packaging | Tube |
| Rango de temperatura de funcionamiento | -40C to +85C (industrial) |
| Tipo de montaje | Surface Mount |
| Manufacturer | Renesas Electronics (formerly Xicor / Intersil) |
Configuración de pines de X5043M8I27A
| Pin 1 | CS — Chip Select (active-low SPI enable) |
| Pin 2 | SO — Serial Data Out (SPI MISO) |
| Pin 3 | WP — Write Protect (hardware block lock for upper EEPROM array) |
| Pin 4 | VSS — Ground |
| Pin 5 | SI — Serial Data In (SPI MOSI) |
| Pin 6 | SCLK — Serial Clock |
| Pin 7 | RESET — Active-low reset output (open drain, requires pull-up) |
| Pin 8 | VCC — Supply voltage |
Aplicaciones típicas
X5043M8I27A es adecuado para 6 aplicacións: Industrial PLC / MCU Reset and Parameter Storage, Secure Boot Sequencing for Embedded Modules, Watchdog Supervision in Motor Drives, EEPROM-Backed Event Logging in Metering, Consumer Embedded System Reset and Storage, Test & Measurement Instrument Front-End.
Industrial PLC / MCU Reset and Parameter Storage
The X5043M8I-2.7A is purpose-built for industrial PLCs and small microcontroller modules that need a single-chip supervisor + parameter memory. The 2.7 V-typical reset threshold matches common 3.3 V system rails with appropriate guard-band, and the 100 ms minimum reset timeout gives downstream MCUs a deterministic warm-up window. The 4 Kbit SPI EEPROM stores calibration constants, node IDs, and boot parameters that survive power cycles, while the internal watchdog catches firmware lock-ups in field-deployed PLCs. The MSOP-8 footprint fits inside crowded PLC base boards and the integrated design eliminates a separate supervisor + EEPROM pair.
Recomendado
Secure Boot Sequencing for Embedded Modules
In embedded modules with a secure-boot requirement, the X5043M8I-2.7A provides a deterministic reset window so the host MCU boots only after VCC is stable. The active-low open-drain RESET output releases the MCU's NRST line cleanly, and the 4 Kbit EEPROM stores immutable boot parameters, MAC addresses, or cryptographic seeds that must survive power loss. The hardware WP pin enables one-time-programmable behavior for security-sensitive fields. Compared to firmware-only boot monitoring, the X5043M8I-2.7A adds hardware independence - the reset is asserted regardless of MCU state, which is critical in brown-out and glitch recovery scenarios.
Recomendado
Watchdog Supervision in Motor Drives
Motor drives benefit from the X5043M8I-2.7A's internal watchdog timer, which resets the MCU if the firmware stops servicing the WDI pin within the programmed window. Combined with the voltage supervisor, the part guards against both firmware lock-ups (a common failure mode in brushed-DC and stepper drives where EMI can disrupt the MCU) and brown-out conditions from high-current motor transients. The MSOP-8 footprint slots easily into compact gate-driver boards, and the 4 Kbit SPI EEPROM stores motor calibration constants such as current-sense offsets and PWM dead-time values.
Recomendado
EEPROM-Backed Event Logging in Metering
Utility meters and metering sub-systems use the X5043M8I-2.7A to store tamper events, calibration logs, and rolling consumption data in the integrated 4 Kbit SPI EEPROM. The supervisor holds the meter MCU in reset during battery-backed power transitions, ensuring clean state on main-power restore. The low-VCC data-retention spec (down to 1 V) supports lithium battery backup for last-gasp telemetry. With 512 bytes of EEPROM the meter can log dozens of tamper events with timestamps, well-matched to typical AMI / AMR metering firmware architectures.
Recomendado
Consumer Embedded System Reset and Storage
In consumer appliances and IoT edge nodes, the X5043M8I-2.7A replaces two discrete ICs (a voltage supervisor and a standalone EEPROM) with one MSOP-8 device. The integrated watchdog protects against firmware hangs in field-deployed products where a service call is expensive. The 4 Kbit SPI EEPROM stores user preferences, factory defaults, and last-state memory (for example, the last washing-machine cycle or HVAC setpoint). The compact footprint suits space-constrained consumer designs where every square millimeter of PCB matters.
Recomendado
Test & Measurement Instrument Front-End
Test and measurement instruments - bench multimeters, low-end oscilloscopes, signal generators - use the X5043M8I-2.7A to provide reliable MCU reset and calibration-storage functions. The supervisor's 100 ms minimum reset timeout prevents instrument boot glitches, while the 4 Kbit EEPROM stores NIST-traceable calibration coefficients, PCB serial numbers, and last-known user settings. The SPI interface is fast enough to load calibration tables at boot without perceptible delay. Industrial -40 to +85 C temperature range supports indoor and field-portable instrument use cases.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para X5043M8I27A — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | X5043M8I-2.7A | X5043M8IZ-2.7A | X5043M8I | X5043S8I-2.7A | X5045M8I-2.7A | AT25040B-MAHP-T |
|---|---|---|---|---|---|---|---|
| Package | MSOP-8 (3.00 mm) | MSOP-8 - same | MSOP-8 - same | MSOP-8 - same | SOIC-8 - same die, different package | MSOP-8 - same | MSOP-8 - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Microchip Technology |
| Serial Interface | SPI (3-wire) | SPI | SPI | SPI | SPI | I2C (2-wire) | SPI (EEPROM only) |
| VCC Reset Threshold (nominal) | 2.7 V | 2.7 V | 2.7 V | standard X5043 default | 2.7 V | 2.7 V | no supervisor |
| Integrated EEPROM | 4 Kbit SPI | 4 Kbit SPI | 4 Kbit SPI | 4 Kbit SPI | 4 Kbit SPI | 4 Kbit I2C | 4 Kbit SPI (no supervisor) |
| Reset Polarity | Active Low | Active Low | Active Low | Active Low | Active Low | Active Low | n/a (EEPROM only) |
| Reset Output Type | Open Drain | Open Drain | Open Drain | Open Drain | Open Drain | Open Drain | n/a |
| Watchdog Timer | Yes (internal osc) | Yes | Yes | Yes | Yes | Yes | No |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Diferenciadores clave
- Single-chip supervisor + 4 Kbit SPI EEPROM integration (frente a Discrete MAX811 + 25AA040 design)
- Hardware block-lock protection via WP pin (frente a AT25040B-MAHP-T)
- 100 ms minimum reset timeout with open-drain output (frente a X5045M8I-2.7A (I2C variant))
Notas de diseño
Place a 0.1 uF ceramic bypass capacitor directly between VCC (pin 8) and VSS (pin 4) within 3 mm of the package. The X5043M8I-2.7A's internal VCC supervisor uses a precision bandgap reference; ripple or transient noise on VCC can cause spurious reset assertions. For noisy motor-drive or industrial environments, add a 10 uF tantalum or polymer capacitor in parallel to suppress bulk voltage drops.
The RESET output (pin 7) is open-drain and requires an external pull-up resistor (typically 10 kohm to 100 kohm) tied to the host MCU's logic rail. Do not leave RESET floating - the MCU may interpret random leakage as valid logic levels and boot intermittently. Also confirm that the WDI (watchdog input) is toggled by the firmware within the selected timeout window; failing to service WDI will trigger a reset loop.
SPI bus lines (SCLK, SI, SO, CS) should be routed as short as possible and kept away from switching power or motor traces. Place a small series resistor (22-33 ohm) on SCLK close to the X5043M8I-2.7A to dampen ringing if the SPI bus exceeds 50 mm. Observe tSU_CS and tHD_CS timing from the datasheet to avoid SPI communication errors at maximum clock rates.
Información de cumplimiento
RoHS-compliant and lead-free per Renesas product page; Z-suffix variant denotes lead-free terminal finish. Not AEC-Q100 qualified - not suitable for automotive under-hood applications. Industrial temperature range -40C to +85C.
