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| 型号： | TCM810ZVNB713 |
| 厂商： | Microchip Technology |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC RESET MONITOR 2.32V SOT23B |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 高有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.32V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 产品目录页面： | 662 (CN2011-ZH PDF) |
| 其它名称： | TCM810ZVNB713DKR |
TCM809/TCM810
4.0
4.1
APPLICATIONS INFORMATION
V DD Transient Rejection
Combinations above the curve are detected as a
brown-out or power-down condition. Transient
immunity can be improved by adding a capacitor in
close proximity to the V DD pin of the TCM809/TCM810.
The TCM809/TCM810 provides accurate V DD monitor-
ing and reset timing during power-up, power-down and
4.2
RESET Signal Integrity During
brown-out/sag conditions. These devices also reject
negative-going transients (glitches) on the power
supply line. Figure 4-1 shows the maximum transient
duration vs. maximum negative excursion (overdrive)
for glitch rejection. Any combination of duration and
overdrive that lies under the curve will not generate a
reset signal.
V DD
V TH
Overdrive
Duration
Power-Down
The TCM809 RESET output is valid to V DD = 1.0V.
Below this voltage the output becomes an "open cir-
cuit" and does not sink current. This means CMOS
logic inputs to the microcontroller will be floating at an
undetermined voltage. Most digital systems are
completely shut down well above this voltage.
However, in situations where RESET must be main-
tained valid to V D D = 0V , a pull-down resistor must be
connected from RESET to ground to discharge stray
capacitances and hold the output low (Figure 4-2). This
resistor value, though not critical, should be chosen
such that it does not appreciably load RESET under
normal operation (100 k Ω will be suitable for most
400
320
240
160
80
T A = +25°C
T CM8XX L/M/J (SOT-23)
applications). Similarly, a pull-up resistor to V DD is
required for the TCM810 to ensure a valid high RESET
for V DD below 1.0V.
V DD
V DD
TCM809
0
TCM8XX Z/R/S/T
(SOT-23)
1 5
100
1000
RESET
130
120
Reset Comparator Overdrive
[V TH – V DD ] (mv)
GND
R 1
100 k Ω
110
TCM8XX L/M/J (SC-70)
FIGURE 4-2:
The addition of R 1 at the
100
90
80
70
60
50
40
30
TCM8XX Z/R/S/T (SC-70)
RESET output of the TCM809 ensures that the
RESET output is valid to V DD = 0V.
1
10
100
1000
Reset Comparator Overdrive (mV)
[V TH – V DD ] (mv)
FIGURE 4-1:
Maximum Transient
Duration vs. Overdrive for Glitch Rejection at
+25°C.
? 2005 Microchip Technology Inc.
DS21661D-page 5
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