參數(shù)資料
型號： M37548G2FP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO20
封裝： 4.40 X 6.50 MM, 0.65 MM PITCH, PLASTIC, LSSOP-20
文件頁數(shù)： 68/86頁
文件大小： 1437K
代理商： M37548G2FP
Rev.2.02
Mar 31, 2009
Page 68 of 81
REJ03B0210-0202
7548 Group
(5) Power-on reset circuit characteristics
Table 18 Power-on reset circuit characteristics
(VCC = 1.8 to 5.5 V, VSS = 0 V, Ta =
20 to 85 °C, unless otherwise noted)
NOTE:
VPOR is the start voltage level of Vcc for the built-in power-on reset circuit to operate normally.
Keep VPOR to be lower than the Vcc voltage before rising of the Vcc power source to use the built-in power-on reset circuit.
Set the built-in low voltage detection circuit to be valid when the built-in power-on reset is used.
Table 19 Low voltage detection circuit characteristics
Low voltage detection circuit characteristics
(VCC = 1.8 to 5.5 V, VSS = 0 V, Ta =
20 to 85 °C, unless otherwise noted)
NOTE:
VLVD is the start voltage level of Vcc for the built-in low voltage detection circuit to operate normally.
If the Vcc power source becomes lower than VLVD, first set the Vcc voltage to be lower than VPOR. Next, according to the electrical
characteristics of the power-on reset circuit, perform the rising of Vcc.
Fig 84. Electrical characteristics of power-on reset circuit and low voltage detection circuit
VPOR
TW(VPOR)
TW(VPOR-VDET)
Valid start voltage of power-on reset circuit (Note)
VPOR hold time
Rising time of valid power source of power-on reset circuit
Symbol
Parameter
Limits
Unit
Min.
Typ.
V
s
ms
Max.
0
20
TW(VPOR) > 10 s
Test conditions
10
VLVD
VDET
TDET
Valid start voltage of low voltage detection circuit (Note)
Detection voltage of low voltage detection circuit
Detection time of low voltage detection circuit
Symbol
Parameter
Limits
Unit
Min.
1.0
1.85
1.80
Typ.
1.95
20
V
s
Max.
2.05
2.10
Test conditions
Vcc power source
waveform
VPOR
0V
TW(VPOR)
T(VPOR-VDET)
TDET
VDET
Internal reset signal
Power-on reset circuit
characteristics
Low voltage detection circuit
characteristics
VLVD
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