An On-Chip Power-on Reset Circuit for Low Voltage Technology

Takeo YASUDA  Masaaki YAMAMOTO  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E85-A   No.2   pp.366-372
Publication Date: 2002/02/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
power-on reset,  low voltage,  state initialization,  

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The power supply voltage of LSI has been lowered due to system requirements for low power dissipation. An on-chip power-on reset pulse generator (POR-PG) is used to determine the initial state of the memory devices of the system LSI. The requirement for the POR-PG is strict for lower power supply voltage because noise margin is smaller relatively. This paper describes a POR-PG for low power voltage supply (Vdd) which overcomes these problems. Hardware measurement proves improved pulse height relative to various power-on profiles (slope, rise time etc.) and fluctuations of temperature and process. Further, the design provides robust noise immunity against voltage fluctuations on the power supply line. The circuit is implemented within a small area (115 µm 345 µm) in the input/output buffer area of a micro-processor and hard-disk controller integrated LSI with 0.25-µm four-layer-metal CMOS technology.