MICROCHIP TC1271MERC

TC1270/TC1271
4-Pin µP Reset Monitors
Features
Package Type
• Precision VCC Monitor for 1.8V, 2.7V, 3.0V, 3.3V
and 5.0V Nominal Supplies
• Manual Reset Input
• 140msec Minimum RESET, RESET Output
Duration
• RESET Output Valid to V CC = 1.0V (TC1270)
• Low 7µA Supply Current
• VCC Transient Immunity
• Small 4-Pin SOT-143 Package
• No External Components
• Replacement for MAX811/812 and Offers a Lower
Threshold Voltage Option
GND
1
Computers
Embedded Systems
Battery Powered Equipment
Critical µP Power Supply Monitoring
Device Selection Table
Part Number
Package
Temp. Range
TC1270xERC
4-Pin SOT-143
-40°C to +85°C
TC1271xERC
4-Pin SOT-143
-40°C to +85°C
NOTE: “x” denotes a suffix for VCC threshold (see table
below)
Suffix*
Reset VCC Threshold (V)
L
4.63
M
4.38
T
3.08
S
2.93
R
2.63
VCC
3
MR
TC1270
TC1271
TC1270 RESET
TC1271 (RESET)
2
General Description
F
1.75
The reset output is driven active within 20µsec (4µsec
for F version) of VCC falling through the reset voltage
threshold. RESET is maintained active for a minimum
of 140msec after VCC rises above the reset threshold.
The TC1271 has an active-high RESET output while
the TC1270 has an active-low RESET output. The
output of the TC1270 is valid down to VCC = 1V. Both
devices are available in a 4-Pin SOT-143 package.
The TC1270/TC1271 devices are optimized to reject
fast transient glitches on the VCC line. Low supply
current of 7µA (VCC = 3.3V) makes these devices
suitable for battery powered applications.
Typical Operating Circuit
VCC
VCC
VCC
Processor
*Custom thresholds available, contact factory.
MR
PushButton
RESET
TC1270
GND
 2002 Microchip Technology Inc.
4
The TC1270 and TC1271 are cost-effective system
supervisor circuits designed to monitor VCC in digital
systems and provide a reset signal to the host
processor when necessary. A manual reset input is
provided to override the reset monitor, and is suitable
for use as a push-button reset. No external
components are required.
Applications
•
•
•
•
4-Pin SOT-143
RESET
Input
(Active Low)
GND
DS21381B-page 1
TC1270/TC1271
1.0
ELECTRICAL
CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
Absolute Maximum Ratings*
Supply Voltage (V CC to GND) .............................+6.0V
RESET, RESET.......................... -0.3V to (VCC + 0.3V)
Input Current, VCC ...............................................20mA
Output Current, RESET, RESET .........................20mA
Operating Temperature Range............. -40°C to +85°C
Storage Temperature Range .............. -65°C to +150°C
TC1270/TC1271 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F
version. TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. (Note 1).
Symbol
Parameter
Min
Typ
Max
Units
VCC
VCC Range
1.2
—
5.5
V
ICC
Supply Current
—
—
—
7
10
6
15
15
12
µA
VTH
Reset Threshold
4.54
4.50
4.30
4.25
3.03
3.00
2.88
2.85
2.58
2.55
1.71
1.70
4.63
—
4.38
—
3.08
—
2.93
—
2.63
—
1.75
—
4.72
4.75
4.46
4.50
3.14
3.15
2.98
3.00
2.68
2.70
1.79
1.80
V
tRP
tMR
Test Conditions
VCC > VTH, for L/M/R/S/T/F
VCC < VTH, for L/M/R/S/T
VCC < VTH, for F
TC127_L; TA = +25°C
TA = -40°C to +85°C
TC127_M; TA = +25°C
TA = -40°C to +85°C
TC127_T; TA = +25°C
TA = -40°C to +85°C
TC127_S; TA = +25°C
TA = -40°C to +85°C
TC127_R; TA = +25°C
TA = -40°C to +85°C
TC127_F; TA = +25°C
TA = -40°C to +85°C
Reset Threshold Tempco
—
30
—
ppm/°C
VCC to Reset Delay
—
—
20
5
—
—
µsec
VCC = VTH to VTH – 125mV; L/M/R/S/T/F
Reset Active Timeout Period
140
280
560
msec
VCC = VTH(MAX)
MR Minimum Pulse Width
10
—
—
µsec
MR Glitch Immunity
—
0.1
—
µsec
tMD
MR to Reset Propagation Delay
—
0.5
—
µsec
VIH
VIL
MR Input Threshold
2.3
—
—
—
—
0.8
V
VCC > VTH(MAX),
TC127_L/M
0.7 VCC
—
—
—
—
0.15 VCC
V
VCC > VTH(MAX),
TC127_R/S/T/F
10
20
40
kΩ
VIH
VIL
MR Pull-up Resistance
Note
1:
2:
Production testing done at TA = +25°C, over temperature limits ensured by design.
RESET output for TC1270, RESET output for TC1271.
DS21381B-page 2
 2002 Microchip Technology Inc.
TC1270/TC1271
TC1270/TC1271 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, VCC = 3V for R version, VCC = 2.0V for F
version. TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C. (Note 1).
Symbol
Parameter
V OH
RESET Output Voltage High
(TC1271)
VOL
RESET Output Voltage Low
(TC1271)
VOL
RESET Output Voltage Low
(TC1270)
RESET Output Voltage High
(TC1270)
V OH
Note
1:
2:
Min
Typ
Max
Units
0.8 VCC
—
—
V
ISOURCE = 150µA;
VCC ≤ VTH(MIN)
V
—
—
0.2
TC1271F only,
ISINK = 500µA,
VCC = VTH(MAX)
—
—
—
—
0.3
0.4
TC1271R/S/T only,
ISINK = 1.2mA, VCC = VTH(MAX)
TC1271L/M only, ISINK = 3.2mA,
VCC = VTH(MAX)
—
—
0.3
—
—
—
—
0.4
TBD
VCC – 1.5
—
—
0.8 VCC
—
—
V
Test Conditions
TC1270R/S/T only,
ISINK = 1.2mA, VCC = VTH(MIN)
TC1270F only:
ISINK = 500µA, VCC = VTH(MIN)
TC1270L/M only,
ISINK = 3.2mA, VCC = VTH(MIN)
ISINK = 50µA, VCC > 1.0V
V
TC1270L/M only,
ISOURCE = 800µA,
VCC = VTH(MAX)
TC1270R/S/T/F only,
ISOURCE = 500µA,
VCC = VTH(MAX)
Production testing done at TA = +25°C, over temperature limits ensured by design.
RESET output for TC1270, RESET output for TC1271.
 2002 Microchip Technology Inc.
DS21381B-page 3
TC1270/TC1271
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin No.
(SOT-143-4)
Symbol
1
GND
2
RESET
(TC1270)
RESET output remains low while VCC is below the reset voltage threshold, and for at least
140msec min. after VCC rises above reset threshold.
2
RESET
(TC1271)
RESET output remains high while VCC is below the reset voltage threshold, and for at least
140msec min. after VCC rises above reset threshold.
Description
Ground.
3
MR
Manual reset input generates a reset when MR is below VIL.
4
V CC
Supply voltage.
DS21381B-page 4
 2002 Microchip Technology Inc.
TC1270/TC1271
3.0
APPLICATIONS INFORMATION
3.1
VCC Transient Rejection
The TC1270/TC1271 provides accurate VCC monitoring and reset timing during power-up, power-down, and
brownout/sag conditions, and rejects negative-going
transients (glitches) on the power supply line. Figure
3-1 shows the maximum transient duration vs.
maximum negative excursion (overdrive) for glitch
rejection. Any combination of duration and overdrive
that lays under the curve will not generate a reset
signal. Combinations above the curve are detected as
a brownout or power-down. Transient immunity can be
improved by adding a capacitor in close proximity to the
VCC pin of the TC1270/TC1271.
FIGURE 3-1:
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 (100kΩ will be suitable for most
applications). Similarly, a pull-up resistor to VCC is
required for the TC1271 to ensure a valid high RESET
for VCC below 1.1V.
FIGURE 3-2:
ENSURING RESET VALID
TO VCC = 0V
VCC
VCC
MAXIMUM TRANSIENT
DURATION VS.
OVERDRIVE FOR GLITCH
REJECTION AT 25°C
TC1270
RESET
R1
100k
GND
VCC
VTH
Overdrive
MAXIMUM TRANSIENT DURATION (µsec)
Duration
400
TA
°C
320
240
160
3.3
Processors With Bidirectional
I/O Pins
Some µP's (such as Motorola 68HC11) have bidirectional reset pins. Depending on the current drive
capability of the processor pin, an indeterminate logic
level may result if there is a logic conflict. This can be
avoided by adding a 4.7 kΩ resistor in series with the
output of the TC1270/TC1271 (Figure 3-3). If there are
other components in the system which require a reset
signal, they should be buffered so as not to load the
reset line. If the other components are required to
follow the reset I/O of the µP, the buffer should be
connected as shown with the solid line.
TC127LMJ
FIGURE 3-3:
80
TC127xR/S/T
0
1
INTERFACING TO
BIDIRECTIONAL
RESET I/O
10
1000
100
RESET COMPARATOR OVERDRIVE,
VTH - VCC (mV)
Buffer
Buffered RESET
To Other System
Components
VCC
3.2
RESET Signal Integrity During
Power-Down
The TC1270 RESET output is valid to V CC = 1.0V.
Below this voltage the output becomes an "open
circuit" and does not sink current. This means CMOS
logic inputs to the µP 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
maintained valid to VCC = 0V, a pull-down resistor must
 2002 Microchip Technology Inc.
VCC
VCC
TC1270
RESET
GND
µP
4.7k
RESET
GND
DS21381B-page 5
TC1270/TC1271
4.0
TYPICAL CHARACTERISTICS
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein are
not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Supply Current vs.Temperature
(No Load, TC127xR/S/T/F)
Supply Current vs.Temperature
(No Load, TC127xL/M)
14
8
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
12
10
VCC = 5V
V
8
VCC = 3V
V
6
4
VCC = 1V
6
VCC = 5V
4
VCC = 3V
VCC = 1V
2
2
-20
0
20
40
60
0
-40
85
-20
20
40
60
TEMPERATURE (°C)
Power-Down Reset Delay vs. Temperature
(TC127xF)
Power-Down Reset Delay vs. Temperature
(TC127xL/M/R/S/T)
50
40
30
VOD = 20mV
20
10
VOD = 100mV
VOD = 200 mV
0
-40
-20
0
20
40
60
L/M
40
VOD = 20
0mV
VOD = 100mV
VOD = 200mV
30
R/S/T
VOD = 200mV
VOD = 100mV
20
VOD = 20mV
10
0
-40
85
85
50
-20
TEMPERATURE (°C)
0
20
40
60
85
TEMPERATURE (°C)
Normalized Reset Threshold vs. Temperature
Power-Up Reset Timeout vs. Temperature
1.0030
250
1.0020
NORMALIZED THRESHOLD (V)
POWER-UP RESET TIMEOUT (msec)
0
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (µsec)
POWER-DOWN RESET DELAY (µsec)
0
-40
245
1.0010
1.0000
TC127xL/M
240
TC127xR/S/T/F
235
230
225
-40
0.9990
0.9980
0.9970
0.9960
0.9950
0.9940
-20
0
20
40
TEMPERATURE (°C)
DS21381B-page 6
60
85
-40
-15
35
10
TEMPERATURE (°C)
60
65
 2002 Microchip Technology Inc.
TC1270/TC1271
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
1
&
2
(V)
4.63
4.38
3.08
2.93
2.63
1.75
3
represents year and quarter code
4
represents production lot ID code
Code
T1
T2
T3
T4
T5
T7
= part number code + temperature range
(two-digit code)
Part Number
TC1270LERC
TC1270MERC
TC1270TERC
TC1270SERC
TC1270RERC
TC1270FERC
5.2
Part Number
TC1271LERC
TC1271MERC
TC1271TERC
TC1271SERC
TC1271RERC
TC1271FERC
(V)
4.63
4.38
3.08
2.93
2.63
1.75
Code
S1
S2
S3
S4
S5
S7
Package Dimensions
4-Pin SOT-143
.079 (2.00)
.071 (1.80)
.055 (1.40)
.047 (1.20)
.098 (2.50)
.083 (2.10)
.080 (2.03)
.070 (1.78)
.120 (3.05)
.105 (2.67)
.040 (1.02)
.031 (0.79)
.006 (0.15)
.004 (0.09)
8° MAX.
.004 (0.10)
.001(0.02)
.037 (0.94)
.030 (0.77)
.021 (0.54)
.015 (0.38)
.010 (0.25)
.005 (0.13)
Dimensions: inches (mm)
 2002 Microchip Technology Inc.
DS21381B-page 7
TC1270/TC1271
NOTES:
DS21381B-page 8
 2002 Microchip Technology Inc.
TC1270/TC1271
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.
2.
3.
Your local Microchip sales office
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
 2002 Microchip Technology Inc.
DS21381B-page9
TC1270/TC1271
NOTES:
DS21381B-page10
 2002 Microchip Technology Inc.
TC1270/TC1271
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property
rights.
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© 2002, Microchip Technology Incorporated, Printed in the
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 2002 Microchip Technology Inc.
DS21381B-page 11
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05/01/02
DS21381B-page 12
 2002 Microchip Technology Inc.