- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄65801 > MAX6800UR39D3+T (MAXIM INTEGRATED PRODUCTS INC) 3-Pin, Low-Power µP Reset Circuits PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX6800UR39D3+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3-Pin, Low-Power µP Reset Circuits |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封裝： | SOT-23, 3 PIN |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 147K |
| 代理商： | MAX6800UR39D3+T |
3-Pin, Low-Power
P Reset Circuits
_______________________________________________________________________________________
5
MAX6800/MAX6801/MAX6802
Table 1. Factory-Trimmed Reset Thresholds
TA = +25
°CTA = -40°C to +125°C
RESET
THRESHOLD
SUFFIX
MIN
TYP (VTH)
MAX
MIN
MAX
48
4.714
4.80
4.886
4.656
4.944
47
4.615
4.70
4.785
4.559
4.841
46
4.547
4.63
4.713
4.491
4.769
45
4.419
4.50
4.581
4.365
4.635
44
4.301
4.38
4.459
4.249
4.511
43
4.223
4.30
4.377
4.171
4.429
42
4.124
4.20
4.276
4.074
4.326
41
4.026
4.10
4.174
3.977
4.223
40
3.928
4.00
4.072
3.880
4.120
39
4.830
3.90
3.970
3.783
4.017
38
3.732
3.80
3.868
3.686
3.914
37
3.633
3.70
3.767
3.589
3.811
36
3.535
3.60
3.665
3.492
3.708
35
3.437
3.50
3.563
3.395
3.605
34
3.339
3.40
3.461
3.298
3.502
33
3.241
3.30
3.359
3.201
3.399
32
3.142
3.20
3.258
3.104
3.296
31
3.025
3.08
3.135
2.988
3.172
30
2.946
3.00
3.054
2.910
3.090
29
2.877
2.93
2.983
2.842
3.018
28
2.750
2.80
2.850
2.716
2.884
27
2.651
2.70
2.749
2.619
2.781
26
2.583
2.63
2.677
2.551
2.709
Ensuring a Valid Reset Output
Down to VCC = 0
When VCC falls below 1V and approaches the minimum
operating voltage of 0.7V, push/pull-structured reset
sinking (or sourcing) capabilities decrease drastically.
High-impedance CMOS-logic inputs connected to the
RESET pin can drift to indeterminate voltages. This
does not present a problem in most cases, since most
Ps and circuitry do not operate when VCC drops
below 1V. For the MAX6801 application, where RESET
must be valid down to 0, adding a pulldown resistor
between RESET and GND removes stray leakage cur-
rents, holding RESET low (Figure 2a). The pulldown
resistor value is not critical; 100k
is large enough not
to load RESET and small enough to pull it low. For the
MAX6800 application, where RESET must be valid to
VCC = 0, a 100k
pullup resistor between RESET and
VCC will hold RESET high when VCC falls below 0.7V
(Figure 2b).
Since the MAX6802 has an open-drain, active-low out-
put, it typically uses a pullup resistor. With this device,
RESET will most likely not maintain an active condition,
but will drift to a non-active level due to the pullup
resistor and the reduced sinking capability of the open-
drain device. Therefore, this device is not recommend-
ed for applications where the RESET pin is required to
be valid down to VCC = 0.
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。