ROMJIST Volume 22, No. 2, 2019, pp. 158-180
Anca Mihaela Dragan, Andrei Enache, Alina Negut, Adrian Macarie Tache, Gheorghe Brezeanu An Improved I/O Pin for Serial Communication Interfaces
ABSTRACT: Modern mid-speed serial communication interfaces are required to operate in a wide range of power supply voltages, while achieving transmission rates in the order of Mbps or tens of Mbps. An important factor in determining the maximum bit rate is the I/O of the interface. An I/O pin with an improved digital push-pull output buffer is designed and implemented in a 0.18µm CMOS EEPROM process. The pin acts as an interface between an internal low voltage and an external, higher level voltage. The circuit can operate at power supply voltages from 1.6V to 5.6V and can be used in an I2C UFm interface at 5 Mbps and an SPI interface at 10 Mbps. These performances were achieved through topology changes to a classic digital output buffer.KEYWORDS: Serial communication interface, wide voltage range, high data rate, I/O pin, digital output buffer, push pull stageRead full text (pdf)