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NXP Semiconductors PCF1252-6T/F4,112
- Part No.:
- PCF1252-6T/F4,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCF1252-6T/F4,112.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,909
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Product details
Overview
PCF1252-6T/F4,112 from Philips Semiconductors is a low-power CMOS voltage threshold detector and reset generator designed for microcontroller/microprocessor system supervision. It features a factory-programmed 3.25 V trip point (±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 power monitoring applications.
For engineers reviewing the PCF1252-6T/F4,112 datasheet, PCF1252-6T/F4,112 pinout, PCF1252-6T/F4,112 application, or PCF1252-6T/F4,112 equivalent, key selection considerations include its precise 3.25 V threshold, external capacitor–programmable reset delay (tR = 400–2000 µs at CCT = 1 nF), polarity-selectable RESET output, and integrated second comparator for overvoltage or auxiliary rail monitoring.
Technical Context
The PCF1252-6T/F4,112 integrates two independent comparators: Comparator 1 uses an internal reference to monitor VDD against its factory-set 3.25 V trip point, generating a delayed RESET pulse and POWF signal; Comparator 2 accepts an external input (COMIN) referenced to a fixed 1.30 V switch point for secondary voltage monitoring without hysteresis.
Its timing behavior is defined by external capacitor CCT connected to pin CT: tR (reset pulse width) and tS (save time before RESET assertion after POWF activation) scale linearly with CCT - e.g., tR(typ.) = (0.1 + CCT) ms - enabling design-adjustable power-fail response windows for data retention in memory backup systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VTRIP | 3.25 V ±50 mV - precise factory-programmed threshold ensures reliable reset initiation above microcontroller minimum operating voltage. |
| IDD | 10 µA typ. - ultra-low quiescent current enables long battery life in always-on supervision circuits. |
| tR | 400–2000 µs (CCT = 1 nF) - externally adjustable reset pulse duration provides flexibility for diverse MCU reset timing requirements. |
| VSP (COMIN) | 1.30 V ±20 mV - fixed switch point for second comparator allows accurate auxiliary rail or overvoltage detection without external reference. |
| Vhys | 15–50 mV - built-in hysteresis prevents oscillation during VDD transitions near trip point, ensuring clean reset assertion. |
| Operating Temp | −40 to +85 °C - industrial-grade temperature range supports deployment in automotive body control, industrial PLCs, and telecom equipment. |
| Supply Range | 2.4 to 6.0 V - wide VDD range accommodates 3.3 V and 5 V systems while maintaining trip point accuracy. |
Pinout & Package
PCF1252-6T/F4,112 is housed in an SO8 plastic small outline package (SOT96-1), 8-lead, 3.9 mm body width, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CT (Pin 1) | Reset delay timing node | Connects external capacitor (CCT) to set tR and tS; internal 100 pF capacitance ensures minimum delay if unconnected. |
| SELECT (Pin 2) | RESET polarity / external trigger control | LOW = active-high RESET; HIGH = active-low RESET; also accepts debounced external reset signal per Fig.11. |
| COMIN (Pin 3) | Second comparator input | Monitors auxiliary voltage via external divider; triggers COMOUT when input exceeds 1.30 V; connect to VDD if unused. |
| VSS (Pin 4) | Ground reference | 0 V return path for all internal circuitry; must be low-impedance for stable threshold operation. |
| COMOUT (Pin 5) | Second comparator output | Digital output indicating COMIN status: HIGH if >1.30 V, LOW if <1.30 V; no hysteresis. |
| RESET (Pin 6) | System reset signal | Open-drain or push-pull (configurable via SELECT); asserts after power-on delay or power-fail sequence. |
| POWF (Pin 7) | Power failure warning | Active-low signal asserted immediately when VDD drops below VTRIP; initiates tS save-time window before RESET. |
| VDD (Pin 8) | Supply input | 2.4–6.0 V main power rail; internally divided for threshold comparison; absolute max 7.0 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent comparators | Enables simultaneous primary VDD supervision and secondary rail/overvoltage monitoring without external components. |
| Factory-programmed 3.25 V threshold | Eliminates external resistor dividers and calibration; ±50 mV accuracy over full temperature range ensures robust reset timing. |
| Externally programmable reset delay | CCT capacitor sets both tR (reset pulse width) and tS (power-fail save time), allowing precise tuning for RAM backup or orderly shutdown sequences. |
| Advance power-fail warning (POWF) | Provides deterministic early indication of falling VDD, enabling critical data storage before system collapse. |
| Low 10 µA supply current | Minimizes impact on battery-backed systems and enables use in energy-constrained IoT edge nodes. |
Applications
| Microcontroller Power-On Reset | Memory Backup Data Retention |
|---|---|
Use Scenario: Ensuring reliable initialization of an 8-bit MCU after cold power-up or brownout recovery. IC Role / Device Role / Timing Role: PCF1252-6T/F4,112 monitors VDD rise, asserts RESET after programmable delay until stable operation is confirmed. Use Value: Prevents MCU lockup by guaranteeing reset pulse exceeds minimum required width (e.g., >100 µs) across voltage and temperature variations. | Use Scenario: Preserving SRAM contents during unexpected AC mains loss in industrial HMI panels. IC Role / Device Role / Timing Role: PCF1252-6T/F4,112 detects VDD drop, asserts POWF, then triggers RESET after tS delay to allow microcontroller to store volatile data. Use Value: tS = 40–200 µs (scalable with CCT) provides deterministic window for EEPROM write or register save before power collapse. |
| Overvoltage Protection Monitoring | Multi-Rail System Supervision |
Use Scenario: Detecting 12 V rail overvoltage in a dual-supply (5 V + 12 V) motor control board. IC Role / Device Role / Timing Role: PCF1252-6T/F4,112's COMIN pin monitors scaled 12 V via resistor divider; COMOUT asserts if voltage exceeds 1.30 V reference. Use Value: Enables immediate fault flagging without dedicated op-amp circuitry; switch point drift <±10 mV over 10 years ensures long-term reliability. | Use Scenario: Coordinating startup sequencing of FPGA core (1.2 V) and I/O (3.3 V) rails in telecom baseband modules. IC Role / Device Role / Timing Role: PCF1252-6T/F4,112 supervises main 3.3 V rail (VDD), while COMIN monitors 1.2 V rail via divider to verify both are valid before releasing RESET. Use Value: Dual-comparator architecture eliminates need for second supervisor IC, reducing BOM count and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage threshold detection and reset generation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691CPA+ | 5 V only supply; fixed 4.65 V reset threshold; no second comparator; 12 µA ICC. | Lacks auxiliary monitoring capability and adjustable trip point; suited for single-rail 5 V systems only. | Select when only basic 5 V reset is needed and COMIN functionality is unnecessary. |
| TPS3823-33DBVR | 3.3 V fixed threshold; 1.6 µA ICC; no POWF output; no second comparator; SOT-23-5 package. | Smaller footprint and lower current, but no power-fail warning or dual-monitoring capability. | Choose for space-constrained 3.3 V designs where advanced supervision features are not required. |
Compared with MAX691CPA+ and TPS3823-33DBVR, the PCF1252-6T/F4,112 offers unique dual-comparator supervision, factory-programmed 3.25 V threshold with ±50 mV accuracy, and POWF-driven save-time sequencing - making it optimal for systems requiring coordinated power-fail response and auxiliary rail monitoring in a single SO8 device.
Availability
PCF1252-6T/F4,112 is available at Aetrix Electronics and suitable for microcontroller reset, memory backup, overvoltage detection, and multi-rail power sequencing applications requiring stable component supply and long-lifecycle support.
Supply support for PCF1252-6T/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 markets.
The PCF1252-X family was designed specifically for low-power, high-accuracy power supply supervision in microcontroller-based systems - emphasizing precision threshold stability, minimal current draw, and flexible reset timing for embedded reliability.
FAQ
What is the exact factory-programmed voltage trip point for PCF1252-6T/F4,112?
The PCF1252-6T/F4,112 has a factory-programmed voltage trip point (VTRIP) of 3.25 V, with guaranteed limits of 3.20 V (min) and 3.30 V (max) at Tamb = 25 °C. This value is laser-trimmed during manufacturing and maintains ±50 mV accuracy over the full −40 to +85 °C operating temperature range, as specified in the "Characteristics" table of the datasheet.
How does the CT pin (Pin 1) affect reset timing in PCF1252-6T/F4,112?
The CT pin on the PCF1252-6T/F4,112 connects to an external capacitor (CCT) that directly controls both reset pulse width (tR) and save time (tS). With CCT = 1 nF, tR ranges from 400 to 2000 µs and tS from 40 to 200 µs. The relationship is linear: tR(typ.) = (0.1 + CCT) ms and tS(typ.) = (0.01 + 0.1 × CCT) ms. If CCT is omitted, internal 100 pF capacitance sets minimum delays.
Can PCF1252-6T/F4,112 monitor two different voltage rails simultaneously?
Yes, the PCF1252-6T/F4,112 supports dual-rail monitoring: Comparator 1 supervises VDD against its 3.25 V trip point, while Comparator 2 accepts an external voltage at COMIN (Pin 3) referenced to a fixed 1.30 V switch point. When used with a resistor divider, COMIN can monitor a second rail (e.g., 12 V or 1.8 V); COMOUT (Pin 5) then indicates high/low status without hysteresis.
What is the function of the POWF output on PCF1252-6T/F4,112?
The POWF (Power Fail) output on PCF1252-6T/F4,112 is an active-low signal that asserts immediately when VDD falls below the 3.25 V trip point. It initiates the tS save-time interval, after which RESET is asserted - providing a deterministic window for critical data storage or controlled shutdown before complete power loss.
Is PCF1252-6T/F4,112 compatible with 3.3 V and 5 V microcontroller systems?
Yes, the PCF1252-6T/F4,112 operates across a 2.4 V to 6.0 V supply range and delivers reliable reset behavior in both 3.3 V and 5 V systems. Its 3.25 V trip point is intentionally set above the minimum operating voltage of common 3.3 V MCUs (e.g., 2.7 V), ensuring sufficient margin for stable reset assertion and avoiding premature release during power ramp-up.
PCF1252-6T/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:
- 3.25V
- 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
PCF1252-6T/F4,112 FAQ
1.How can I place an order for PCF1252-6T/F4,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCF1252-6T/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 PCF1252-6T/F4,112 reliable?
The price and inventory of PCF1252-6T/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 PCF1252-6T/F4,112 is usually 5 days.
3.What payment methods are accepted for PCF1252-6T/F4,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCF1252-6T/F4,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCF1252-6T/F4,112?
PCF1252-6T/F4,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCF1252-6T/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 PCF1252-6T/F4,112?
For technical support, including PCF1252-6T/F4,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCF1252-6T/F4,112 requirements.
6.How does Aetrix verify that PCF1252-6T/F4,112 is sourced from the original manufacturer or authorized distributors?
All PCF1252-6T/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 PCF1252-6T/F4,112 meets industry standards.
7.What is the process for return or replacement of PCF1252-6T/F4,112?
All PCF1252-6T/F4,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCF1252-6T/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 PCF1252-6T/F4,112 part is unused and in its original packaging.
Return procedure for PCF1252-6T/F4,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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