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参数资料
| 型号： | TCM809SVNB713 |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封装： | LEAD FREE, PLASTIC, TO-236, SOT-23B, 3 PIN |
| 文件页数： | 12/16页 |
| 文件大小： | 205K |
| 代理商： | TCM809SVNB713 |
2005 Microchip Technology Inc.
DS21661D-page 5
TCM809/TCM810
4.0
APPLICATIONS INFORMATION
4.1
VDD Transient Rejection
The TCM809/TCM810 provides accurate VDD monitor-
ing and reset timing during power-up, power-down and
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.
FIGURE 4-1:
Maximum Transient
Duration vs. Overdrive for Glitch Rejection at
+25°C.
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 VDD pin of the TCM809/TCM810.
4.2
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
completely shut down well above this voltage.
However, in situations where RESET must be main-
tained 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 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
applications). Similarly, a pull-up resistor to VDD is
required for the TCM810 to ensure a valid high RESET
for VDD below 1.0V.
FIGURE 4-2:
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)
M
axi
m
u
m
T
ran
si
en
t
Du
rati
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
R
ese
tD
e
la
y
(
s
ec)
TCM8XXL/M/J (SC-70)
TCM8XXZ/R/S/T (SC-70)
TCM809
V
DD
V
DD
R1
100 k
Ω
RESET
GND
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TCM809SVNB713-CUT TAPE | 制造商:Microchip 功能描述:TCM809 Series 2.93 V 140 ms 3-Pin Microcontroller Reset Monitor - SOT23B-3 |
| TCM809TEB713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Microcontroller Reset Monitors |
| TCM809TELB713 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Microcontroller Reset Monitors |
| TCM809TEN | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:3-Pin Microcontroller Reset Monitors |
| TCM809TENB | 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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