PST620 Datasheet | Mitsumi Electronics

MITSUMI System Reset (with battery back-up) PST620, 621 System Reset (with battery back-up) Monolithic IC PST620, 621 Outline These ICs are part of the regular series of back-up ICs, and use capacitors (super capacitor, large capacity chemical capacitor) as back-up power supply. They control 1-chip microputer high-speed, low-speed, and stand-by modes (MNI control). These ICs also are capable of controlling data save in EPROM and other nonvolatile memories during power outage. Features 1. Low current consumption 2. Capacitors (super capacitor, large capacity chemical capacitor) are used for back-up power supply, lowering system cost 3. Stable 1-chip microputer crystal oscillator rise time maintained with the built-in pulse shaver. 4. In addition to power outage detection for main power supply (+5V), there are built-in pins to detect AC power supply and +5V power supply primary side 5. Reset signal output by back-up power supply (super capacitor, large capacity chemical capacitor) detection Package DIP-8B (PST620DDB, PST621DDB) SOP-8C (PST620DFT, PST621DFT) Applications 1. 2. 3. 4. VCR Audio equipment munications equipment Rice cookers, etc. .. Pin Assignment 8 7 6 5 Pin Description Pin No. 1 2 3 4 5 6 7 8 Pin name VAC VCC1 VCC2 TC RE PSCONT CE GND Function Has +2.0V detection voltage to detect AC power supply and stable power supply primary side, for quick power outage detection. +5V main power supply Back-up power supply (back-up capacitor connected) Pulse width setting pin for pulse shaver (capacitor and resistor connected) Reset output Pulse shaver ON/OFF switching High : OFF Low : ON Chip enable signal output GND MITSUMI System Reset (with battery back-up) PST620, 621 PST621 Pin No. 1 2 3 4 5 6 7 8 Pin name VAC VCC1 VCC2 TC -------------------------------- Function Has +2.0V detection voltage to detect AC power supply and stable power supply primary side, for quick power outage detection. MODE CE...