UPD70F3723

www.DataSheet4U.com Preliminary User's Manual V850ES/JJ2 32-Bit Single-Chip Microcontrollers Hardware µPD70F3720 µPD70F3721 µPD70F3722 µPD70F3723 µPD70F3724 Document No. U17714EJ1V0UD00 (1st edition) Date Published October 2005 N CP(K) 2005 Printed in Japan [MEMO] www.DataSheet4U.com 2 Preliminary User's Manual U17714EJ1V0UD NOTES FOR CMOS DEVICES www.DataSheet4U.com 1 VOLTAGE APPLICATION WAVEFORM AT INPUT PIN Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the CMOS device stays in the area between VIL (MAX) and VIH (MIN) due to noise, etc., the device may malfunction. Take care to prevent chattering noise from entering the device when the input level is fixed, and also in the transition period when the input level passes through the area between VIL (MAX) and VIH (MIN). 2 HANDLING OF UNUSED INPUT PINS Unconnected CMOS device inputs can be cause of malfunction. If an input pin is unconnected, it is possible that an internal input level may be generated due to noise, etc., causing malfunction. CMOS devices behave differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed high or low by using pull-up or pull-down circuitry. Each unused pin should be connected to VDD or GND via a resistor if there is a possibility that it will be an output pin. All handling related to unused pins must be judged separately for each device and according to related specifications governing the device. 3 PRECAU...