TC1272 DATA SHEET (02/27/2007) DOWNLOAD

Obsolete Device
TC1272/TC1273/TC1274
3-Pin Reset Monitors for 5V Systems
Features
General Description
• Precision VCC Monitor for 5.0V Systems
• 100 ms Minimum RESET, RESET Output
Duration
• Output Valid to VCC = 1.2V
• VCC Transient Immunity
• Small 3-Pin SOT-23 Package
• No External Components
The TC1272/TC1273/TC1274 are cost-effective
system supervisor circuits designed to monitor VCC in
digital systems and provide a reset signal to the host
processor when necessary. No external components
are required.
Applications
•
•
•
•
Computers
Embedded Systems
Battery-Powered Equipment
Critical µP Power Supply Monitoring
Package Type
3-Pin SOT-23
RESET
**(RESET)
The TC1272/TC1273/TC1274 devices are optimized to
reject fast transient glitches on the VCC line.
Typical Application Circuit
1
TC1272
TC1273
TC1274
VCC
The reset output is driven active within 20 µs of VCC
falling through the reset voltage threshold. RESET is
maintained active for a minimum of 100 ms after VCC
rises above the reset threshold. The TC1274 has an
active-high RESET output, while the TC1272 and
TC1273 have an active-low RESET output. The
TC1272 and TC1274 each have a complimentary output, while the TC1273 has an open-drain output. The
output of the TC1272 and TC1273 is valid down to VCC
= 1.2V. The TC1274 is valid down to VCC = 1.8V. All
three devices are available in a 3-Pin SOT-23
package.
2
**( ) is for TC1274
VCC
3
GND
2
VCC
RESET
VCC
1
RESET
Input
TC1272
Processor
GND
GND
3
© 2007 Microchip Technology Inc.
DS21382C-page 1
TC1272/TC1273/TC1274
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 (VCC to GND) .............................+6.0V
RESET, RESET.......................... -0.3V to (VCC + 0.3V)
Input Current, VCC ..............................................20 mA
Output Current, RESET, RESET ........................20 mA
Power Dissipation (TA ≤ 70°C)
3-Pin SOT-23 (derate 4 mW/°C above +70°C)
................................................................230 mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range ..............-65°C to +150°C
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, TA = -40°C to +85°C. Typical values are at TA = +25°C.
Parameters
Sym
Min
Typ
Max
Units
TC1272, TC1273
VCC
1.2
—
5.5
V
TC1274
VCC
1.8
—
5.5
V
—
V
Conditions
Supply Voltage
Output Voltage @ 0-500 µA
VOH
VCC – 0.5V VCC – 0.1V
Note 1
TC1272, TC1274 (Note 1)
Output Current @ 2.4 Volts
VCC = 5V TC1272
IOH
—
10
—
mA
VCC = 4V TC1274
IOH
—
8
—
mA
IOL
+10
30
—
mA
Note 2, Note 5
VCC < 5.5V: TC1272, TC1274
ICC
—
17
40
µA
Note 3
VCCTP < VCC < 5.5V: TC1273
ICC
—
17
40
µA
Note 3
VCC < VCCTP: TC1273
ICC
—
700
1200
µA
Note 3
VCCTP-5
4.50
4.62
4.75
V
Note 1
VCC Trip Point (TC1272/3/4-10) VCCTP-10
4.25
4.37
4.49
V
Note 1
VCC Trip Point (TC1272/3/4-15) VCCTP-15
4.00
4.12
4.24
V
Note 1
COUT
—
9
—
pF
RP
3
6
9
kΩ
Output Current @ 0.4 Volts
Note 2
Operating Current
VCC Trip Point (TC1272/3/4-5)
Output Capacitance
Internal Pull-Up Resistor
AC Electrical Characteristics: TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C.
RESET Active Time
tRST
100
200
300
ms
VCC Detect to RESET
TC1272, TC1273
tRPD1
—
20
50
µs
VCC(LOW) = 1V, Figure 4-2
VCC Detect to RESET - TC1274
tRPD2
—
20
50
µs
VCC(LOW) = 1V, Figure 4-4
VCC Slew Rate
(VCCTP(MAX) to VCCTP(MIN))
tF
300
—
—
µs
Figure 4-2, Figure 4-4
VCC Slew Rate
(VCCTP(MIN) to VCCTP(MAX))
tR
0
—
—
ns
Figure 4-1, Figure 4-3
VCC Detect to RESET
TC1272, TC1273
tRPU1
100
200
300
ms
Note 4, Figure 4-1
VCC Detect to RESET - TC1274
tRPU2
100
200
300
ms
Note 4, Figure 4-3
Note 1:
2:
3:
4:
5:
All voltages referenced to ground.
Measured with VCC ≥ 2.7 volts.
Measured with RESET output open for TC1272/TC1273; measured with RESET output open for TC1274.
tR = 5 µs.
A 1 kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control
circuit when using the TC1273.
DS21382C-page 2
© 2007 Microchip Technology Inc.
TC1272/TC1273/TC1274
2.0
TYPICAL PERFORMANCE CURVES
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.
300
TA = 25°C
100000
VOD = 20mV
VOD = 100mV
10000
VOD = 200mV
VOD = 1V
1000
VOD = 2V
100
10
1
10
TA = 25°C
200
100
0
100
1000
10000
100000
VCC SLEW RATE (V/μsec)
FIGURE 2-1:
(RESET).
VCC TO RESET DELAY (μsec)
VCC TO RESET DELAY (μsec)
Note: Unless otherwise indicated, TA = -40°C to +85°C. Typical values are at TA = +25°C.
Comparator Overdrive voltage (VOD) is defined in Figure 4-5
VCC Detect to Reset
© 2007 Microchip Technology Inc.
0
1
2
3
4
5
COMPARATOR OVERDRIVE (V)
FIGURE 2-2:
Reset Delays vs.
Comparator Overdrive.
DS21382C-page 3
TC1272/TC1273/TC1274
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
PIN FUNCTION TABLES
Pin No.
Symbol
Function
1
RESET
RESET Output (TC1272 and TC1273)
1
RESET
RESET Output (TC1274)
2
VCC
Supply voltage (1.2V to 5.5V TC1272 and TC1273; 1.8V to 5.5V TC1274)
3
GND
Ground
RESET Output (RESET)
The RESET output remains low while VCC is below the
reset voltage threshold, and for 200 ms (100 ms
minimum) after VCC rises above reset threshold. The
output stage of the TC1272 is complimentary, while the
output stage of the TC1273 is open-drain.
DS21382C-page 4
3.2
RESET Output (RESET)
The RESET output remains high while VCC is below the
reset voltage threshold, and for 200 ms (100 ms
minimum) after VCC rises above reset threshold. The
output stage of the TC1274 is complimentary.
© 2007 Microchip Technology Inc.
TC1272/TC1273/TC1274
4.0
APPLICATIONS INFORMATION
4.1
Operation – Power Monitor
The TC1272/TC1273/TC1274 is designed to function
as a voltage monitor for +5V systems. These devices
provide a RESET signal to indicate that the VCC has
dropped below a preset voltage level that is selected by
the suffix part number. In addition, the RESET is held
active for approximately 200 ms after the power supply
has risen above the voltage threshold level to allow
time for the power supply to stabilize before system
operation commences.
VCCTP(MAX)
VCCTP
VCCTP(MIN)
VCC
tRPU2
VOL
RESET
tR
VCCTP(MIN)
tR
VCCTP(MAX)
VCCTP
FIGURE 4-3:
(TC1274).
Timing Diagram – Power Up
VCC
tF
tRPU1
VCC
VOH
VCCTP(MAX)
VCCTP
VCCTP(MIN)
RESET
FIGURE 4-1:
Timing Diagram – Power Up
(TC1272/TC1273).
tRPD2
VOH
tF
VCC
RESET
VCCTP(MAX)
VCCTP
VCCTP(MIN)
RESET Slews With VCC
FIGURE 4-4:
Timing Diagram –
Power Down (TC1274).
tRPD1
RESET
VOL
FIGURE 4-2:
Timing Diagram – Power
Down (TC1272/TC1273).
© 2007 Microchip Technology Inc.
DS21382C-page 5
TC1272/TC1273/TC1274
VCC Transient Rejection
The TC1272/TC1273/TC1274 provides accurate VCC
monitoring and reset timing during power-up, powerdown and brownout/sag conditions, and rejects
negative-going transients (glitches) on the power
supply line. Figure 4-5 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 condition.
Transient immunity can be improved by adding a
capacitor in close proximity to the VCC pin of the
TC1272/TC1273/TC1274.
4.3
RESET Signal Integrity During
Power-Down
The TC1272 RESET output is valid to VCC = 1.2V.
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 be connected from
RESET to ground to discharge stray capacitances and
hold the output low (Figure 4-6). This resistor value,
though not critical, should be chosen such that it does
not appreciably load RESET under normal operation
(100 kΩ will be suitable for most applications). Similarly, a pull-up resistor to VCC is required for the
TC1274 to ensure a valid high RESET for VCC below
1.8V.
VCC
VTH
Overdrive
Duration
MAXIMUM TRANSIENT DURATION (µsec)
4.2
500
TA = +25°C
400
300
200
TC1272/3/4
100
0
1
10
1000
100
RESET COMPARATOR OVERDRIVE,
[VCCTP-VCC] (mV)
FIGURE 4-5:
Maximum Transient
Duration vs. Overdrive For Glitch Rejection At
+25°C.
VCC
VCC
TC1272
RESET
R1
GND
FIGURE 4-6:
Vcc = 0V.
DS21382C-page 6
100 kΩ
Ensuring Reset Valid To
© 2007 Microchip Technology Inc.
TC1272/TC1273/TC1274
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
3-Pin SOT-23
3
1 2
3
1
1
&
2
4
2
represents part number code +
temperature range and voltage
Reset VCC
Threshold (V)
TC1272
Code
TC1273
Code
TC1274
Code
4.62
X1
Y1
Z1
4.37
X2
Y2
Z2
4.12
X3
Y3
Z3
3
represents year and quarter code
4
represents lot ID number
© 2007 Microchip Technology Inc.
DS21382C-page 7
TC1272/TC1273/TC1274
3-Lead Plastic Small Outline Transistor (TT or NB) [SOT-23]
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
b
N
E
E1
2
1
e
e1
D
c
A
φ
A2
A1
L
Units
Dimension Limits
Number of Pins
MILLIMETERS
MIN
NOM
MAX
N
3
Lead Pitch
e
0.95 BSC
Outside Lead Pitch
e1
Overall Height
A
0.89
–
Molded Package Thickness
A2
0.79
0.95
1.02
Standoff
A1
0.01
–
0.10
1.90 BSC
1.12
Overall Width
E
2.10
–
2.64
Molded Package Width
E1
1.16
1.30
1.40
Overall Length
D
2.67
2.90
3.05
Foot Length
L
0.13
0.50
0.60
Foot Angle
φ
0°
–
10°
Lead Thickness
c
0.08
–
0.20
Lead Width
b
0.30
–
0.54
Notes:
1. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.25 mm per side.
2. Dimensioning and tolerancing per ASME Y14.5M.
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
Microchip Technology Drawing C04-104B
DS21382C-page 8
© 2007 Microchip Technology Inc.
TC1272/TC1273/TC1274
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.
XX
X
/XX
Device
Reset VCC
Threshold
Temperature
Range
Package
Device:
Reset VCC
Threshold Voltage
TC1272:
TC1273:
TC1274:
5
10
15
3-Pin Reset Monitor - Complementary
3-Pin Reset Monitor - Open-Drain
3-Pin Reset Monitor - Complementary
= 4.62V
= 4.37V
= 4.12V
Temperature Range:
E
= -40°C to +85°C
Package:
NB = Plastic Small Outline Transistor (SOT-23), 3-lead
© 2007 Microchip Technology Inc.
Examples:
a)
TC1272-10ENBTR: 4.37V Reset
b)
TC1272-15ENBTR: 4.12V Reset
c)
TC1272-5ENBTR:
a)
TC1273-10ENBTR: 4.37V Reset
b)
TC1273-15ENBTR: 4.12V Reset
c)
TC1273-5ENBTR:
a)
TC1274-10ENBTR: 4.37V Reset
b)
TC1274-15ENBTR: 4.12V Reset
c)
TC1274-5ENBTR:
4.62V Reset
4.62V Reset
4.62V Reset
DS21382C-page9
TC1272/TC1273/TC1274
NOTES:
DS21382C-page 10
© 2007 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
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© 2007, Microchip Technology Incorporated, Printed in the
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© 2007 Microchip Technology Inc.
DS21382C-page 11
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12/08/06
DS21382C-page 12
© 2007 Microchip Technology Inc.