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参数资料
| 型号： | TCM809LVNB |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封装： | SOT-23B, 3 PIN |
| 文件页数： | 11/16页 |
| 文件大小： | 298K |
| 代理商： | TCM809LVNB |
TCM809/TCM810
DS21661B-page 4
2002 Microchip Technology Inc.
2.0
APPLICATIONS INFORMATION
2.1
VDD Transient Rejection
The TCM809/TCM810 provides accurate VDD monitor-
ing and reset timing during power-up, power-down, and
brownout/sag conditions. These devices also reject
negative-going transients (glitches) on the power sup-
ply line. Figure 2-1 shows the maximum transient dura-
tion vs. maximum negative excursion (overdrive) for
glitch rejection. Any combination of duration and over-
drive which lies under the curve will not generate a
reset signal.
FIGURE 2-1:
Maximum
Transient
Duration
vs.
Overdrive for Glitch Rejection at 25°C.
Combinations above the curve are detected as a
brownout or power-down condition. Transient immunity
can be improved by adding a capacitor in close proxim-
ity to the VDD pin of the TCM809/TCM810.
2.2
RESET Signal Integrity During
Power-Down
The TCM809 RESET output is valid to VDD = 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 com-
pletely shutdown well above this voltage. However, in
situations where RESET must be maintained valid to
VDD = 0V, a pull-down resistor must be connected from
RESET to ground to discharge stray capacitances and
hold the output low (Figure 2-2). This resistor value,
though not critical, should be chosen such that it does
not appreciably load RESET under normal operation
(100 k
will be suitable for most applications). Simi-
larly, a pull-up resistor to VDD is required for the
TCM810 to ensure a valid high RESET for VDD below
1.0V.
FIGURE 2-2:
The addition of R1 at the RESET
output of the TCM809 ensures that the RESET output
is valid to VDD = 0V.
Reset Comparator Overdrive
[V
TH - VDD] (mv)
400
240
160
320
80
0
1
5
100
1000
T
A = +25°C
V
TH
Duration
Overdrive
V
DD
TCM8XXL/M/J (SOT-23)
Maxi
m
u
m
T
ran
sien
tD
u
ra
ti
o
n
(
sec
)
TCM8XXZ/R/S/T
(SOT-23)
[V
TH - VDD] (mv)
30
40
50
60
70
80
90
100
110
120
130
1
10
100
1000
Reset Comparator Overdrive (mV)
V
DD
to
Reset
Delay
(
sec)
TCM8XXL/M/J (SC-70)
TCM8XXZ/R/S/T (SC-70)
TCM809
V
DD
V
DD
R1
100 k
RESET
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TCM809LVNB713 | 功能描述:监控电路 Microprocessor 4.63V RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| TCM809MEB713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Microcontroller Reset Monitors |
| TCM809MELB713 | 制造商:Microchip Technology Inc 功能描述: |
| TCM809MEN | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Microcontroller Reset Monitors |
| TCM809MENB | 制造商:TELCOM 制造商全称:TelCom Semiconductor, Inc 功能描述:3-PIN UP RESET MONITORS |
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