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NXP Semiconductors PCF1252-0T/F4,112
- Part No.:
- PCF1252-0T/F4,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCF1252-0T/F4,112.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
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Product details
Overview
PCF1252-0T/F4,112 from Philips Semiconductors is a low-power CMOS voltage threshold detector and reset generator designed for microcontroller/microprocessor power supervision. It features a factory-programmed 4.75 V trip voltage (±50 mV accuracy), 10 µA typical supply current, −40 to +85 °C operating range, and dual-comparator architecture with POWF output for power-fail detection in embedded systems.
For engineers reviewing the PCF1252-0T/F4,112 datasheet, PCF1252-0T/F4,112 pinout, PCF1252-0T/F4,112 application, or PCF1252-0T/F4,112 equivalent, key selection considerations include its precise 4.75 V threshold, external capacitor–programmable reset delay (tR = 400–2000 µs), polarity-selectable RESET output, and second comparator for overvoltage monitoring at 1.30 V switch point.
Technical Context
The PCF1252-0T/F4,112 integrates two independent comparators: Comparator 1 monitors VDD against a precision internal reference to generate RESET and POWF signals; Comparator 2 accepts an external input (COMIN) referenced to a fixed 1.30 V switch point for secondary system monitoring. Its delay circuit uses an external capacitor (CCT) connected to pin CT to set both reset pulse width (tR) and save time (tS).
It operates from 2.4–6.0 V supply, delivers defined outputs at 0.6 V (typ.), includes 15–50 mV hysteresis to prevent oscillation near VTRIP, and supports polarity inversion via the SELECT pin. The device is specified for full industrial temperature range with ±100 ppm/K trip-point drift and long-term stability of ≤±10 mV drift over 10 years.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Trip Point | 4.75 V (factory-programmed; ±50 mV accuracy over −40 to +85 °C) |
| Supply Current | 10 µA typical (enables battery-backed or ultra-low-power system supervision) |
| Operating Temperature | −40 to +85 °C (fully specified for industrial embedded applications) |
| Reset Pulse Width (tR) | 400–2000 µs (externally adjustable via 1 nF–1 µF capacitor on CT pin) |
| Power-Fail Save Time (tS) | 40–200 µs (time between POWF assertion and RESET activation for data retention) |
| COMIN Switch Point | 1.30 V (fixed reference for second-level voltage monitoring without hysteresis) |
| Hysteresis | 15–50 mV (prevents chatter during slow VDD transitions near trip point) |
Pinout & Package
PCF1252-0T/F4,112 is supplied in SO8 package (SOT96-1), plastic small outline, 8-lead, 3.9 mm body width, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CT (Pin 1) | External timing capacitor connection | Sets RESET pulse duration (tR) and POWF-to-RESET delay (tS); supports 100 pF–1 µF range |
| SELECT (Pin 2) | Polarity control / external reset input | LOW = active-high RESET; HIGH = active-low RESET; also accepts debounced external reset signal |
| COMIN (Pin 3) | Second comparator input | Monitors external voltage divider; triggers COMOUT when input exceeds 1.30 V (no hysteresis) |
| VSS (Pin 4) | Ground reference | 0 V return path for all internal circuits and outputs |
| COMOUT (Pin 5) | Second comparator output | Active-high open-drain output indicating COMIN > 1.30 V; requires pull-up for logic interface |
| RESET (Pin 6) | System reset output | Push-pull output with built-in delay; asserts after VDD rises above VTRIP or POWF activates |
| POWF (Pin 7) | Power-fail warning output | Active-low signal asserted when VDD falls below VTRIP; initiates tS delay before RESET |
| VDD (Pin 8) | Positive supply input | 2.4–6.0 V operation; internally divided for threshold comparison; max 7.0 V absolute rating |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent comparators | Enables simultaneous primary power supervision (VDD vs. 4.75 V) and secondary monitoring (e.g., 5 V rail vs. 1.30 V reference) |
| Factory-trimmed trip voltage | 4.75 V threshold with ±50 mV tolerance across full temperature range eliminates external calibration |
| Externally programmable timing | Single capacitor (CCT) sets both reset duration and power-fail save time-reducing BOM count and layout complexity |
| Power-fail advance warning | POWF output asserts before RESET, providing deterministic window (tS) for nonvolatile data storage or controlled shutdown |
| Low quiescent current | 10 µA typical consumption enables use in always-on, battery-buffered systems without significant drain |
Applications
| Microcontroller Power-On Reset | Memory Data Retention System |
|---|---|
Use Scenario: Ensuring reliable boot sequence in 5 V microcontroller systems after power-up or brownout recovery. IC Role / Device Role / Timing Role: Generates a clean, capacitor-timed reset pulse upon VDD crossing 4.75 V; SELECT pin configures active-high or active-low logic level. Use Value: Prevents erratic MCU operation by guaranteeing minimum reset assertion time (400–2000 µs) independent of supply ramp rate. | Use Scenario: Preserving RAM contents during main power loss using backup battery or capacitor hold-up. IC Role / Device Role / Timing Role: POWF output signals impending failure; tS delay allows MCU to store critical state before RESET halts execution. Use Value: Provides guaranteed 40–200 µs save window (scalable with CCT) for safe write-to-NVRAM or register backup. |
| Overvoltage Monitoring Node | Multi-Rail System Supervisor |
Use Scenario: Detecting overvoltage on a 3.3 V I/O rail using external resistor divider referenced to COMIN. IC Role / Device Role / Timing Role: Comparator 2 monitors divided rail voltage against fixed 1.30 V reference; COMOUT flags excursion. Use Value: Enables secondary protection without additional IC-COMIN has no hysteresis, supporting precise threshold detection. | Use Scenario: Coordinating reset sequencing across 5 V core and 3.3 V peripheral rails in mixed-voltage embedded systems. IC Role / Device Role / Timing Role: Primary VDD supervision (4.75 V) ensures CPU reset; COMIN/COMOUT monitors auxiliary rail for synchronized fail-safe response. Use Value: Single IC replaces discrete supervisor + comparator combo-reducing footprint and interconnect risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor and reset generator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691CPA+ | 5 V supply only; fixed 4.65 V reset threshold; no second comparator; no POWF output | Lacks power-fail warning and dual-monitoring capability; suited for simpler single-rail reset-only use | Choose when only basic reset generation is needed and POWF/COMIN functionality is unnecessary |
| TPS3823-47DBVR | 4.7 V threshold (±0.5%); 200 ms fixed reset timeout; no external timing capacitor; no secondary comparator | Fixed delay eliminates timing component but removes design flexibility; no COMIN monitoring path | Prefer for cost-sensitive, high-volume designs where programmable delay and dual monitoring are not required |
Compared with MAX691CPA+ and TPS3823-47DBVR, the PCF1252-0T/F4,112 uniquely combines factory-trimmed 4.75 V supervision, externally adjustable reset timing, dedicated POWF signaling, and a second comparator-making it suitable for systems requiring coordinated power fail response and multi-point voltage monitoring within one SO8 package.
Availability
PCF1252-0T/F4,112 is available at Aetrix Electronics and suitable for microcontroller power-on reset, memory data retention, overvoltage monitoring, and multi-rail system supervision requiring stable component supply and long-lifecycle support.
Supply support for PCF1252-0T/F4,112 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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor manufacturer founded in the Netherlands, specializing in analog, logic, and mixed-signal ICs for industrial, automotive, and consumer applications.
The PCF1252-X family was developed specifically for low-power, precision voltage supervision in microcontroller-based systems-emphasizing reliability, minimal external components, and deterministic power-fail response in harsh thermal environments.
FAQ
What is the factory-programmed voltage trip point for PCF1252-0T/F4,112?
The PCF1252-0T/F4,112 has a factory-programmed voltage trip point of 4.75 V, with a tolerance of ±50 mV over the full −40 to +85 °C operating temperature range. This value is laser-trimmed during manufacturing and is documented in the "Characteristics" table of the datasheet under PCF1252-0. It serves as the primary threshold for RESET and POWF activation.
How is the reset pulse duration set for PCF1252-0T/F4,112?
The reset pulse duration (tR) of the PCF1252-0T/F4,112 is set by an external capacitor (CCT) connected to the CT pin (Pin 1). With CCT = 1 nF, tR ranges from 400 to 2000 µs; the relationship is approximately tR(typ.) = (0.1 + CCT) ms. No capacitor yields ~100 µs minimum pulse width due to internal 100 pF capacitance.
Does PCF1252-0T/F4,112 support polarity selection for the RESET output?
Yes, the PCF1252-0T/F4,112 supports RESET polarity selection via the SELECT pin (Pin 2). When SELECT is LOW (connected to VSS), RESET is active-high; when SELECT is HIGH (≥0.7×VDD), RESET is active-low. This allows direct compatibility with MCUs requiring either reset polarity without external inverters.
What is the function of the COMIN and COMOUT pins on PCF1252-0T/F4,112?
COMIN (Pin 3) is the input to Comparator 2, referenced to a fixed 1.30 V internal switch point (VSP). COMOUT (Pin 5) is its open-drain output, going LOW when COMIN < 1.30 V and HIGH when COMIN > 1.30 V. This enables secondary voltage monitoring-e.g., overvoltage detection on an auxiliary rail-without hysteresis or external references.
Can PCF1252-0T/F4,112 be used in battery-backed systems?
Yes, the PCF1252-0T/F4,112 is well-suited for battery-backed systems due to its 10 µA typical supply current and operation down to 2.4 V. Its POWF output provides early warning of supply decay, and the tS delay gives the host MCU time to initiate backup procedures-making it ideal for real-time clocks, SRAM keep-alive, and low-power IoT edge nodes.
PCF1252-0T/F4,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.75V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 400µs Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
PCF1252-0T/F4,112 FAQ
1.How can I place an order for PCF1252-0T/F4,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF1252-0T/F4,112 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 PCF1252-0T/F4,112 reliable?
The price and inventory of PCF1252-0T/F4,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCF1252-0T/F4,112 is usually 5 days.
3.What payment methods are accepted for PCF1252-0T/F4,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF1252-0T/F4,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF1252-0T/F4,112?
PCF1252-0T/F4,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF1252-0T/F4,112 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 PCF1252-0T/F4,112?
For technical support, including PCF1252-0T/F4,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF1252-0T/F4,112 requirements.
6.How does Aetrix verify that PCF1252-0T/F4,112 is sourced from the original manufacturer or authorized distributors?
All PCF1252-0T/F4,112 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 PCF1252-0T/F4,112 meets industry standards.
7.What is the process for return or replacement of PCF1252-0T/F4,112?
All PCF1252-0T/F4,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCF1252-0T/F4,112, 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 PCF1252-0T/F4,112 part is unused and in its original packaging.
Return procedure for PCF1252-0T/F4,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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