公开(公告)号：US09407254B1

公开(公告)日：2016-08-02

申请号：US14515115

申请日：2014-10-15

Applicant: Xilinx, Inc.

Inventor： Koushik De ,  Santosh Yachareni ,  Shidong Zhou

IPC: H03L7/00 ,  H03K17/22 ,  H03K3/012 ,  H03K3/037 ,  G06F1/24

CPC classification number: H03K17/223 ,  G06F1/24 ,  H03K3/0375 ,  H03K5/2472 ,  H03K17/22

Abstract: A device for controlling a power-on reset signal can include a constant current source, for controlling a reference current that is independent of a supply voltage, and a trip point detector circuit driven by the reference current. The trip point detector circuit detects when the supply voltage of the device exceeds a first trip point voltage, and de-asserts the power-on reset signal when the supply voltage exceeds the first trip point voltage. The first trip point voltage can be controlled by a sum of a threshold voltage of a first n-type metal-oxide-semiconductor transistor, a voltage drop across a first resistor, and a threshold voltage of a first p-type metal-oxide-semiconductor transistor. The device may further include a hysteresis circuit, for detecting when the supply voltage falls below a second trip point voltage and causing the trip point detector circuit to reassert the power-on reset signal.

Abstract translation: 用于控制上电复位信号的装置可以包括用于控制独立于电源电压的参考电流的恒定电流源和由参考电流驱动的跳变点检测器电路。 跳闸点检测器电路检测器件的电源电压何时超过第一跳变点电压，并且当电源电压超过第一跳变点电压时，去激活上电复位信号。 可以通过第一n型金属氧化物半导体晶体管的阈值电压，跨越第一电阻器的电压降和第一p型金属氧化物半导体晶体管的阈值电压的和来控制第一跳变点电压， 半导体晶体管。 该装置还可以包括滞后电路，用于检测电源电压何时降低到第二跳变点电压以下，并使跳闸点检测器电路重新接通上电复位信号。