CAT812STBI-T3 ON Semiconductor

CAT811, CAT812 4-Pin Microprocessor Power Supply Supervisors with Manual Reset Description The CAT811 and CAT812 are microprocessor supervisory circuits CAT811, CAT812 Table 1. THRESHOLD SUFFIX SELECTOR DESCRIPTION Nominal Threshold Voltage Threshold Suffix Designation 4.63 V L 4.38 V M 4.00 V J 3.08 V T 2.93 V S 2.63 V R 2.32 V Z Table 2. PIN DESCRIPTION Pin Number CAT811 CAT812 Pin Name Description 1 1 GND Ground. 2 RESET Active LOW reset. RESET is asserted if V falls below the reset threshold and re- CC mains low for at least 140 ms after V rises above the reset threshold. CC 2 RESET Active HIGH reset. RESET is asserted if V falls below the reset threshold and re- CC mains high for at least 140 ms after V rises above the reset threshold. CC 3 3 MR Manual Reset Input. A logic LOW on MR asserts RESET. RESET remains active as long as MR is LOW and for 140 ms after MR returns HIGH. The active low input has an internal 20 k pullup resistor. The input should be left open if not used. 4 4 V Power supply voltage that is monitored. CC V MR CC RESET V CC & + V TOLERANCE CC DIGITAL BIAS RESET DELAY VOLTAGE REFERENCE CAT811 GND V CC MR RESET V CC & + TOLERANCE V CC DIGITAL BIAS RESET DELAY VOLTAGE REFERENCE CAT812 GND Figure 1. Block Diagrams