LOW VOLTAGE LOCKOUT CIRCUIT,申请号US19880236110-传众专利搜索

LOW VOLTAGE LOCKOUT CIRCUIT

申请公布号：US5122920(A)

申请号：US19880236110

申请日期：1988.08.22

申请公布日期：1992.06.16

申请人：

NATIONAL SEMICONDUCTOR CORPORATION

发明人：PEASE, ROBERT A.

分类号：H03K19/003;H03K17/22;H03K17/24;H03K17/30

主分类号：H03K19/003

摘要：An integrated circuit is shown in which provision is made for terminating or locking out the operating circuitry when the supply voltage has fallen below a level that can cause anomalous or unreliable operation. Certain selected transistors are provided with saturation sensors which operate to produce a current when the transistors go into collector saturation. When any of the sensors indicates the onset of saturation, clamping circuitry is energized to provide lock out. In addition, a temperature compensated dummy bandgap circuit is included to sense extremely low supply voltages and provide the lockout function under conditions where a reliable saturation indication might not be available.