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參數(shù)資料
| 型號(hào)： | TCM809 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 3-Pin Microcontroller Reset Monitors(3引腳微控制器復(fù)位監(jiān)控器) |
| 中文描述： | 3引腳單片機(jī)復(fù)位監(jiān)控器（3引腳微控制器復(fù)位監(jiān)控器） |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 298K |
| 代理商： | TCM809 |
TCM809/TCM810
DS21661B-page 4
2002 Microchip Technology Inc.
2.0
APPLICATIONS INFORMATION
2.1
V
DD
Transient Rejection
The TCM809/TCM810 provides accurate V
DD
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:
Overdrive for Glitch Rejection at 25°C.
Maximum
Transient
Duration
vs.
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 V
DD
pin of the TCM809/TCM810.
2.2
RESET Signal Integrity During
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 com-
pletely shutdown well above this voltage. However, in
situations where RESET must be maintained valid to
V
DD
= 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 V
DD
is required for the
TCM810 to ensure a valid high RESET for V
DD
below
1.0V.
FIGURE 2-2:
output of the TCM809 ensures that the RESET output
is valid to
V
DD
= 0V.
The addition of R
1
at the RESET
Reset Comparator Overdrive
[V
TH
- V
DD
] (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
TCM8XXZ/R/S/T
(SOT-23)
[V
TH
- V
DD
] (mv)
30
40
50
60
70
80
90
100
110
120
130
1
10
100
1000
Reset Comparator Overdrive (mV)
V
D
TCM8XXL/M/J (SC-70)
TCM8XXZ/R/S/T (SC-70)
TCM809
V
DD
V
DD
R
1
100 k
RESET
GND
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