PCF1252-4

INTEGRATED CIRCUITS DATA SHEET PCF1252-X family Threshold detector and reset generator Product specification Supersedes data of 1996 Jan 23 File under Integrated Circuits, IC11 1998 Apr 16 Philips Semiconductors Product specification Threshold detector and reset generator 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. ORDERING INFORMATION PACKAGE TYPE NUMBER NAME PCF1252-XP(1) PCF1252-XT(1) Note 1. X = 0 to 9; depending on threshold voltage. BLOCK DIAGRAM DIP8 SO8 DESCRIPTION plastic dual in-line package; 8 leads (300 mil) 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 ...