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PDF TCM810 Data sheet ( Hoja de datos )

Número de pieza TCM810
Descripción (TCM809 / TCM810) 3-Pin Microcontroller Reset Monitors
Fabricantes Microchip Technology 
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TCM809/TCM810
3-Pin Microcontroller Reset Monitors
Features
• Precision VDD Monitor for 2.5V, 3.0V, 3.3V, 5.0V
Nominal System Voltage Supplies
• 140 msec Minimum RESET Time Out Period
• RESET Output to VDD = 1.0V (TCM809)
• Low Supply Current, 9 µA (typ.)
• VDD Transient Immunity
• Small 3-Pin SC-70 and SOT-23B Packages
• No External Components
• Push-Pull RESET Output
• Temperature Range:
- Industrial, SC-70 (E): -40°C to +85°C
- Extended, SOT-23, SC-70 (V): -40°C to +125°C
Applications
• Computers
• Embedded Systems
• Battery-Powered Equipment
• Critical Microcontroller Power Supply Monitoring
• Automotive
Typical Application Circuit
VDD
3
VDD
TCM809
RESET 2
GND
1
VDD
PICmicro®
Microcontroller
RESET
INPUT
(Active-Low)
GND
General Description
The TCM809 and TCM810 are cost-effective system
supervisor circuits designed to monitor VDD in digital
systems and provide a reset signal to the host proces-
sor, when necessary. No external components are
required.
The RESET output is typically driven active within
65 µsec of VDD falling through the reset voltage thresh-
old. RESET is maintained active for a minimum of
140 msec after VDD rises above the reset threshold.
The TCM810 has an active-high RESET output, while
the TCM809 has an active-low RESET output. The out-
put of the TCM809/TCM810 is valid down to VDD = 1V.
Both devices are available in 3-Pin SC-70 and SOT-23B
packages.
The TCM809/TCM810 is optimized to reject fast
transient glitches on the VDD line. A low supply current
of 9 µA (typ., VDD = 3.3V) make these devices suitable
for battery-powered applications.
Pin Configurations
SOT-23B/SC-70
GND 1
TCM809 RESET 2
TCM810 (RESET)
3 VDD
Note: 3-Pin SOT-23B is equivalent to
JEDEC TO-236.
2004 Microchip Technology Inc.
DS21661C-page 1

1 page




TCM810 pdf
3.0 APPLICATIONS INFORMATION
3.1 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 sup-
ply line. Figure 3-1 shows the maximum transient dura-
tion vs. maximum negative excursion (overdrive) for
glitch rejection. Any combination of duration and over-
drive that lies under the curve will not generate a reset
signal.
VDD
VTH
Overdrive
Duration
400
TA = +25°C
320
240
160
TCM8XXL/M/J (SOT-23)
80
TCM8XXZ/R/S/T
0 (SOT-23)
15
100
1000
Reset Comparator Overdrive
[VTH - VDD] (mv)
130
120
110
100
90
80
70
60
50
40
30
1
TCM8XXL/M/J (SC-70)
TCM8XXZ/R/S/T (SC-70)
10 100
Reset Comparator Overdrive (mV)
[VTH - VDD] (mv)
1000
FIGURE 3-1:
Maximum Transient
Duration vs. Overdrive for Glitch Rejection at
+25°C.
TCM809/TCM810
Combinations above the curve are detected as a
brown-out or power-down condition. Transient immu-
nity can be improved by adding a capacitor in close
proximity to the VDD pin of the TCM809/TCM810.
3.2 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 3-2). This
resistor value, though not critical, should be chosen
such that it does not appreciably load RESET under
normal operation (100 kwill 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.
VDD
VDD
TCM809
RESET
GND
R1
100 k
FIGURE 3-2:
The addition of R1 at the
RESET output of the TCM809 ensures that the
RESET output is valid to VDD = 0V.
2004 Microchip Technology Inc.
DS21661C-page 5

5 Page





TCM810 arduino
TCM809/TCM810
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
X
X XXXXX
Examples:
Device
VDD
Reset
Threshold
Temperature
Range
Package
a) TCM809LENB713:
Device:
TCM809: Supervisor circuit with active-low RESET output
TCM810: Supervisor circuit with active-high RESET output
b) TCM809LVLB713:
VDD Reset Threshold: L
M
J
T
S
R
Z
= 4.63V
= 4.38V
= 4.00V
= 3.08V
= 2.93V
= 2.63V
= 2.32V
Temperature Range: E = -40°C to +85°C
V = -40°C to +125°C
Package:
NB713 = SOT-23B, 3-pin (Tape and Reel)
LB713 = SC-70, 3-pin (Tape and Reel)
c) TCM809LVNB713:
a) TCM810MENB713:
b) TCM810RVLB713:
c) TCM810TVLB713:
SOT-23B-3-TR,
Microcontroller 4.63V
Reset Monitor,
-40°C to +85°C,
Tape and Reel.
SC-70-3-TR,
Microcontroller 4.63V
Reset Monitor,
-40°C to +125°C,
Tape and Reel.
SOT-23B-3-TR,
Microcontroller 4.63V
Reset Monitor,
-40°C to +125°C,
Tape and Reel.
SOT-23B-3-TR,
Microcontroller 4.38V
Reset Monitor,
-40°C to +85°C,
Tape and Reel.
SOT-23B-3-TR,
Microcontroller 2.63V
Reset Monitor,
-40°C to +125°C,
Tape and Reel.
SC-70-3-TR,
Microcontroller 4.38V
Reset Monitor,
-40°C to +125°C,
Tape and Reel.
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and
recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
2004 Microchip Technology Inc.
DS21661C-page 11

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