TC1274-5ENB [MICROCHIP]
1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3, SOT-23B, 3 PIN;
| 型号： | TC1274-5ENB |
| 厂家： | 
MICROCHIP |
| 描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3, SOT-23B, 3 PIN 光电二极管 |
| 文件： | 总7页 (文件大小：52K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TC1272
TC1273
TC1274
3-Pin Reset Monitors For 5V Systems
FEATURES
GENERAL DESCRIPTION
ꢀ Precision VCC Monitor for 5.0V Systems
ꢀ 100 msec Guaranteed Minimum RESET,
RESET Output Duration
The TC1272, TC1273 and 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.
The reset output is driven active within 20µsec of VCC
falling through the reset voltage threshold. Reset is main-
tained active for a minimum of 100msec 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
haveacomplimentary outputwhiletheTC1273hasanopen
drain output. The output of the TC1272 and TC1273 is
guaranteed valid down to VCC = 1.2V. The TC1274 is
guaranteed valid down to VCC =1.8 V. All three devices are
available in a 3-Pin SOT-23B package.
ꢀ
Output Guaranteed to VCC = 1.2V
ꢀ VCC Transient Immunity
ꢀ 3-Pin SOT-23B Package
ꢀ No External Components
TYPICAL APPLICATIONS
ꢀ Computers
ꢀ Embedded Systems
ꢀ Battery Powered Equipment
ꢀ Critical µP Power Supply Monitoring
The TC1272/3/4 are optimized to reject fast transient
glitches on the VCC line.
TYPICAL OPERATING CIRCUIT
VCC
ORDERING INFORMATION
2
Part No.
Order
Package
Temp. Range
VCC
VCC
PROCESSOR
TC1272-xENB Complimentary 3-Pin SOT-23B – 40°C to +85°C
TC1273-xENB Open Drain 3-Pin SOT-23B – 40°C to +85°C
1
RESET
INPUT
RESET
TC1274-xENB Complimentary 3-Pin SOT-23B – 40°C to +85°C
TC1272
NOTE: The "x" denotes a suffix for VCC threshold - see table below.
GND
GND
Suffix
Reset VCC Threshold (V)
3
5
4.62
4.37
4.12
10
15
PIN CONFIGURATION
*3-Pin SOT-23B
RESET **(RESET)
1
GND
TC1272-xENB
TC1273-xENB
TC1274-xENB
3
V
CC
2
NOTES: *3-Pin SOT-23B is equivalent to JEDEC TO-236
** () is for TC1274
© 2001 Microchip Technology Inc. DS21382A
TC1272/3/4-1 9/9/99
3-Pin Monitors For 5V Systems
TC1272
TC1273
TC1274
Power Dissipation (TA ≤ 70°C)
ABSOLUTE MAXIMUM RATINGS*
3-Pin SOT-23B (derate 4mW/°C above +70°C) ......230mW
Storage Temperature Range ................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................. +260°C
*This is a stress rating only and functional operation of the device at these
or any other conditions above those indicated in the operational sections of
the specifications is not implied. Exposure to Absolute Maximum Rating
Conditions for extended periods may affect device reliability.
Supply Voltage (VCC 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
RECOMMENDED DC OPERATING CONDITIONS: TA = –40°C to + 85°C unless otherwise specified. Typical values apply at TA = +25°C.
Symbol Parameter
Test Conditions
Min
Typ
Max
Unit
VCC
Supply Voltage(TC1272, TC1273)
(TC1274)
(note 1)
1.2
1.8
—
—
5.5
5.5
V
V
DC ELECTRICAL CHARACTERISTICS: TA =
–40°C to + 85°C unless otherwise specified. Typical values apply at TA = +25°C.
Symbol Parameter
Test Conditions
Min
Typ
Max
Unit
VOH Output Voltage @ 0-500 µA
(Note 1)
VCC - 0.5V VCC - 0.1V
—
V
(TC1272, TC1274)
IOH
Output Current @2.4 Volts
VCC = 5V (TC1272)
(Note 2)
—
—
10
8
—
—
mA
mA
VCC = 4V (TC1274)
IOL
ICC
Output Current @0.4 Volts
(Notes 2,5)
+10
30
—
mA
Operating Current
VCC <5.5V (TC1272, TC1274)
(Note 3)
(Note 3)
(Note 3)
—
—
—
17
17
700
40
40
1200
µA
µA
µA
VCCTP <VCC <5.5V (TC1273)
VCC <VCCTP (TC1273)
VCCTP 5
VCCTP 10
VCCTP 15
-
VCC Trip Point (TC1272/3/4-5)
VCC Trip Point (TC1272/3/4-10)
VCC Trip Point (TC1272/3/4-15)
Output Capacitance
(Note 1)
(Note 1)
(Note 1)
4.50
4.25
4.00
—
4.62
4.37
4.12
9
4.75
4.49
4.24
—
V
V
-
-
V
COUT
RP
pF
kΩ
Internal Pull-Up Resistor (TC1273)
3
6
9
AC ELECTRICAL CHARACTERISTICS: TA =
–40°C to + 85°C unless otherwise specified. Typical values apply at TA = +25°C.
Symbol Parameter
Test Conditions
Min
100
—
Typ
200
20
Max
300
50
Unit
msec
µsec
tRST
RESET Active Time
tRPD1
VCC Detect to RESET
(TC1272, TC1273)
VCC(LOW)= 1V (Figure 2)
VCC(LOW)= 1V (Figure 4)
(Figures 2, 4)
tRPD2
tF
VCC Detect to RESET
(TC1274)
—
300
0
20
—
50
—
µsec
µsec
nsec
msec
msec
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))
tR
VCC Slew Rate
(Figures 1, 3)
—
—
(VCCTP (MIN) to VCCTP (MAX))
tRPU1
VCC Detect to RESET
(TC1272, TC1273)
(Note 4, Figure 1)
100
100
200
200
300
300
tRPU2
VCC Detect to RESET
(TC1274) (Note 4, Figure 3)
NOTES: 1. All voltages are referenced to ground.
2. Measured with VCC ≥ 2.7 volts.
3. Measured with RESET output open for TC1272/3; measured with RESET output open for TC1274.
4. tR = 5 µsec.
5. A 1kΩ external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when using the TC1273.
© 2001 Microchip Technology Inc. DS21382A
TC1272/3/4-1 9/9/99
2
3-Pin Monitors For 5V Systems
TC1272
TC1273
TC1274
PIN DESCRIPTION
Pin No.
(3-Pin SOT-23B)
Symbol
Description
1
RESET
(TC1272, TC1273)
RESET output remains low while VCC is below the reset voltage threshold, and
for 200msec (100msec min.) after VCC rises above reset threshold. The output
stage of the TC1272 is complimentary. The output stage of the TC1273 is
open drain.
1
RESET
(TC1274)
RESET output remains high while VCC is below the reset voltage threshold,
and for 200msec (100msec min.) after VCC rises above reset threshold. The
ouput stage of the TC1274 is complimentary.
2
3
VCC
Supply voltage (1.2V to 5.5V TC1272 and TC1273, 1.8V to 5.5V TC1274)
Ground
GND
APPLICATION INFORMATION
Operation - Power Monitor
tR
The TC1272, TC1273, TC1274 provide the function of
detecting out-of-tolerance power supply conditions and
warning a processor-based system of impending power
failure. When VCC is detected as out-of-tolerance, the
RESET signal is asserted. On power-up, RESET is kept
active for approximately 200 ms after the power supply has
reached the selected tolerance. This allows the power
supply and microprocessor to stabilize before RESET is
released.
VCCTP(MAX)
VCCTP
VCCTP(MIN)
VCC
t
RPU
1
VOH
RESET
Figure 1. Timing Diagram: Power Up (TC1272, TC1273)
tF
VCC
tR
VCCTP (MAX)
VCCTP
VCCTP(MIN)
4.75V
VCCTP
4.00V
tRPD1
V
CC
RESET
tRPU2
VOL
VOL
RESET
Figure 2. Timing Diagram: Power Down (TC1272, TC1273)
Figure 3. Timing Diagram: Power Up (TC1274)
© 2001 Microchip Technology Inc. DS21382A
TC1272/3/4-1 9/9/99
3
3-Pin Monitors For 5V Systems
TC1272
TC1273
TC1274
VCC Transient Rejection
The TC1272/3/4 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 5 shows the
maximum transient duration vs. maximum negative excur-
sion (overdrive) for glitch rejection. Any combination of
duration and overdrive which lies under the curve will not
generate a reset signal. Combinations above the curve are
detectedasabrownoutorpower-down. Transientimmunity
can be improved by adding a capacitor in close proximity to
the VCC pin of the TC1272/3/4.
tF
VCC
VCCTP(MAX)
VCCTP
VCCTP(MIN)
tRPD2
VCC
VOH
RESET SLEWS WITH VCC
RESET
VCC
Figure 4. Timing Diagram: Power Down (TC1274)
TC1272
RESET
V
CC
R1
100k
GND
V
TH
Overdrive
Figure 6. Ensuring RESET Valid to VCC = 0V
Duration
= +25°C
RESET Signal Integrity During Power-Down
500
T
A
The TC1272 RESET output is valid to VCC = 1.2V.
Belowthisvoltagetheoutputbecomesan"opencircuit"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 shutdown well above this voltage.
However, in situations where RESET must be maintained
valid to VCC = 0V, a pull-down resistor must be connected
fromRESETtogroundtodischarge straycapacitancesand
hold the output low (Figure 6). This resistor value, though
not critical, should be chosen such that it does not apprecia-
bly load RESET under normal operation (100kΩ will be
suitableformostapplications).Similarly,apull-upresistorto
VCC is required for the TC1274 to ensure a valid high
RESET for VCC below 1.8V.
400
300
200
TC1272/3/4
100
0
1
10
1000
100
RESET COMPARATOR OVERDRIVE,
[
V
- V (mV)
]
CCTP
CC
Figure 5. Maximum Transient Duration vs.
Overdrive for Glitch Rejection at 25°C
© 2001 Microchip Technology Inc. DS21382A
TC1272/3/4-1 9/9/99
4
3-Pin Monitors For 5V Systems
TC1272
TC1273
TC1274
TYPICAL CHARACTERISTICS
RESET DELAYS vs.
COMPARATOR OVERDRIVE
V
DETECT TO RESET (RESET)
CC
300
200
T
= 25°C
T
= 25°C
A
A
100000
10000
1000
V
= 20mV
OD
V
= 100mV
OD
V
= 200mV
OD
V
= 1V
OD
V
= 2V
OD
100
0
100
10
1
4
10
5
1000 10000
0
1
2
3
100
100000
V
SLEW RATE (V/µsec)
COMPARATOR OVERDRIVE (V)
Figure 8
CC
Figure 7
MARKINGS
PART NUMBERS AND PART MARKINGS
ꢀꢀ ꢁ = part number code + temperature range and
3-Pin SOT-23B
&
voltage
TC1272 (V)
Code
4.62
4.37
4.12
X1
X2
X3
TC1273 (V)
Code
4.62
4.37
4.12
Y1
Y2
Y3
TC1274 (V)
Code
4.62
4.37
4.12
Z1
Z2
Z3
X
1
ex: 1272-5 = ꢂꢂꢂꢂ
ꢃ represents year and quarter code
ꢄ represents lot ID number
© 2001 Microchip Technology Inc. DS21382A
TC1272/3/4-1 9/9/99
5
3-Pin Monitors For 5V Systems
TC1272
TC1273
TC1274
TAPING FORM
Component Taping Orientation for 3-Pin SOT-23B (JEDEC TO-236) Devices
User Direction of Feed
Device
Marking
W
PIN 1
P
Standard Reel Component Orientation
For TR Suffix Device
(Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
7 in
3-Pin SOT-23B
8 mm
4 mm
3000
PACKAGE DIMENSIONS
3-Pin SOT-23B (JEDEC TO-236)
.021 (0.54)
.015 (0.37)
.055 (1.40)
.047 (1.20)
.103 (2.64)
.083 (2.10)
.040 (0.60)
.017 (0.44)
.120 (3.05)
.105 (2.67)
.040 (1.02)
.031 (0.79)
.007 (0.18)
.003 (0.085)
8° MAX.
.004 (0.10) .080 (2.05)
.010 (0.25)
.005 (0.13)
.001(0.02)
.070 (1.78)
Dimensions: inches (mm)
© 2001 Microchip Technology Inc. DS21382A
TC1272/3/4-1 9/9/99
6
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01/09/01
All rights reserved.
©
2001 Microchip Technology Incorporated. Printed in the USA. 1/01
Printed on recycled paper.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by
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© 2001 Microchip Technology Inc. DS21382A
TC1272/3/4-1 9/9/99
7
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