PCF1252-X family

General description

The PCF1252-Xs are low-power CMOS voltage threshold detectors designed especially for supervision of microcontroller/microprocessor systems for detection of power-on/off conditions and generation of a system reset pulse. The PCF1252-X also provides a POWF (power fail) output which is activated at a precise factory-programmed trip point. A system RESET output has a built-in delay with duration determined by an external capacitor (CCT ). A second comparator (comparator 2) has been included to enable the possibility of a second monitoring point in the system.

Features

• Very low current consumption, typically 10 µA
• 10 factory programmed threshold voltages available covering trip voltages from 4.75 to 2.55 V
• ±50 mV trip point accuracy over full temperature range
• Variable RESET delay
• RESET pulse polarity selection
• Defined outputs at 0.6 V (typ.)
• Comparator for second level detection (e.g. overvoltage detection)
• Advance warning of power fail
• Operating temperature range -40 to +85 °C.

Products/packages

Pricing/ordering/availability

Applications

• Digital cellular radio systems with Time Division Multiple Access (TDMA) operation (GSM systems) in the 880 to 915 MHz frequency range.

Block diagrams/pinning

Design support

Application Notes

AN468_1; Protecting Microcontroller Systems against Power-Supply Imperfections (28-May-01)

AN94088_1; P82C150 serial linked I/O (SLIO) device (20-Dec-94)

Support Documents

75007416; LCD drivers linecard (2001-11-23)

75010589; Microprocessor Supervisory & System Reset Selector Guide (2003-06-01)

Parametrics/similar products

Similar products
PCF1252-X family links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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