MB89475 Datasheet, PDF (30/48 Pages) Fujitsu Component Limited. – 8-bit Proprietary Microcontroller

MB89470 Series
4. AC Characteristics
(1) Reset Timing
(VCC = 5.0 V, AVSS = VSS = 0.0 V, TA = −40 °C to +85 °C)
Parameter
Symbol Condition
Value
Min
Max
Unit
Remarks
RST “L” pulse width
tZLZH

48 tHCYL

ns
Notes : • tHCYL is the oscillation cycle (1/FC) to input to the X0 pin.
• If the reset pulse applied to the external reset pin (RST) does not meet the specifications, it may cause
malfunctions. Use caution so that the reset pulse less than the specifications will not be fed to the external
reset pin (RST).
RST
tZLZH
0.2 VCC
0.2 VCC
(2) Power-on Reset
Parameter
Power supply rising time
Power supply cut-off time
Symbol Condition
tR

tOFF
(AVSS = VSS = 0.0 V, TA = −40 °C to +85 °C)
Value
Unit
Min Max
Remarks

50 ms
1

ms Due to repeated operations
Note : Make sure that power supply rises within the selected oscillation stabilization time.
Rapid changes in power supply voltage may cause a power-on reset. If power supply voltage needs to be
varied in the course of operation, a smooth voltage rise is recommended.
VCC
tR
3.5 V
0.2 V
tOFF
0.2 V
0.2 V
30