TPS3306-25DGKR [TI]
具有电源故障监视功能和看门狗计时器的双处理器电压监控器 | DGK | 8 | -40 to 85;
| 型号： | TPS3306-25DGKR |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 具有电源故障监视功能和看门狗计时器的双处理器电压监控器 | DGK | 8 | -40 to 85 监控 光电二极管 |
| 文件： | 总13页 (文件大小：270K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER-FAIL
FEATURES
APPLICATIONS
•
•
•
•
•
Multivoltage DSPs and Processors
•
Dual Supervisory Circuits With Power-Fail for
DSP and Processor-Based Systems
Portable Battery-Powered Equipment
Embedded Control Systems
Intelligent Instruments
•
Voltage Monitor for Power-Fail or Low-Battery
Warning
Automotive Systems
•
•
Watchdog Timer With 0.8 Second Time-Out
Power-On Reset Generator With Integrated
100 ms Delay Time
D OR DGK PACKAGE
(TOP VIEW)
•
•
•
•
•
•
Open-Drain Reset and Power-Fail Output
Supply Current of 15 µA (Typ.)
SENSE1
SENSE2
PFI
V
DD
1
2
3
4
8
7
6
5
WDI
PFO
Supply Voltage Range . . . 2.7 V to 6 V
Defined RESET Output From VDD ≥ 1.1 V
MSOP-8 and SO-8 Packages
GND
RESET
Temperature Range . . . - 40°C to 85°C
DESCRIPTION
The TPS3306 family is a series of supervisory circuits designed for circuit initialization which require two supply
voltages, primarily in DSP and processor-based systems.
The product spectrum of the TPS3306-xx is designed for monitoring two independent supply voltages of
3.3 V/1.5 V, 3.3 V/1.8 V, 3.3 V/2 V, 3.3 V/2.5 V, or 3.3 V/5 V.
TYPICAL OPERATING CIRCUIT
3.3 V
1.5 V
AV
DD
CV
TPS3306–15
SENSE1
DD
DD
R3 R4
V
DD
DV
R1
1%
SENSE2
PFI
WDI
PFO
B_XF
TMS320
VC5441
A_XF
R2
1%
RESET
GND
RESET
V
V
SS
SSA
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2004, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
The various supervisory circuits are designed to monitor the nominal supply voltage, as shown in the following
supply voltage monitoring table.
SUPPLY VOLTAGE MONITORING
NOMINAL SUPERVISED VOLTAGE
THRESHOLD VOLTAGE (typ)
SENSE1 SENSE2
DEVICE
SENSE1
3.3 V
3.3 V
3.3 V
3.3 V
5 V
SENSE2
1.5 V
1.8 V
2 V
TPS3306-15
TPS3306-18
TPS3306-20
TPS3306-25
TPS3306-33
2.93 V
2.93 V
2.93 V
2.93 V
4.55 V
1.4 V
1.68 V
1.85 V
2.25 V
2.93 V
2.5 V
3.3 V
During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the
supervisory circuits monitor the SENSEn inputs and keep RESET active as long as SENSEn remains below the
threshold voltage VIT.
An internal timer delays the return of the RESET output to the inactive state (high) to ensure proper system
reset. The delay time, td(typ) = 100 ms, starts after SENSE1 and SENSE2 inputs have risen above the threshold
voltage VIT. When the voltage at SENSE1 or SENSE2 input drops below the threshold voltage VIT, the output
becomes active (low) again.
The integrated power-fail (PFI) comparator with separate open-drain (PFO) output can be used for low-battery
detection, power-fail warning, or for monitoring a power supply other than the main supply.
The TPS3306-xx devices integrate a watchdog timer that is periodically triggered by a positive or negative
transition of WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval,
tt(out) = 0.50 s, RESET becomes active for the time period td. This event also reinitializes the watchdog timer.
Leaving WDI unconnected disables the watchdog.
The TPS3306-xx devices are available in either 8-pin MSOP or standard 8-pin SO packages, and are
characterized for operation over a temperature range of -40°C to 85°C.
AVAILABLE OPTIONS
PACKAGED DEVICES
SMALL OUTLINE (D)
MARKING
DGK PACKAGE
TA
µ-SMALL OUTLINE (DGK)
TPS3306-15DGK
TPS3306-18DGK
TPS3306-20DGK
TPS3306-25DGK
TPS3306-33DGK
TPS3306-15D
TPS3306-18D
TPS3306-20D
TPS3306-25D
TPS3306-33D
TIAIC
TIAID
TIAIE
TIAIF
TIAIG
-40°C to 85°C
2
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
FUNCTION/TRUTH TABLES
SENSE1 > VIT1
SENSE2 > VIT2
RESET
0
0
1
1
0
1
0
1
L
L
L
H
FUNCTION/TRUTH TABLES
PFI > VIT
0"1
PFO
L"H
H"L
TYPICAL DELAY
0.5 µs
1"0
0.5 µs
FUNCTIONAL BLOCK DIAGRAM
TPS3306
SENSE 1
SENSE 2
R1
R2
V
DD
+
_
RESET
RESET
R3
Logic + Timer
+
_
R4
GND
Reference
Voltage
of 1.25 V
Oscillator
PFO
_
+
PFI
Watchdog
Logic + Timer
Transition
Detection
WDI
40 kΩ
3
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
TIMING DIAGRAM
SENSEn
V
(nom)
V
IT
1.1 V
t
WDI
1
t
t(out)
0
t
t
RESET
1
Undefined
Behavior
Undefined
Behavior
0
t
d
t
d
t
d
RESET Because of
Power-Down
RESET Because of WDI
RESET Because of a Power Drop Below V
IT–
RESET Because of Power-Up
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
GND
NO.
4
I
I
Ground
PFI
3
Power-fail comparator input
Power-fail comparator output, open-drain
Active-low reset output, open-drain
Sense voltage input 1
PFO
6
O
O
I
RESET
SENSE1
SENSE2
WDI
5
1
2
I
Sense voltage input 2
7
I
Watchdog timer input
VDD
8
I
Supply voltage
DETAILED DESCRIPTION
Watchdog
In a microprocessor- or DSP-based system, it is not only important to supervise the supply voltage, it is also
important to ensure correct program execution. The task of a watchdog is to ensure that the program is not
stalled in an indefinite loop. The microprocessor, microcontroller, or DSP has to typically toggle the watchdog
input within 0.8 s to avoid a time out occurring. Either a low-to-high or a high-to-low transition resets the internal
watchdog timer. If the input is unconnected or tied with a high impedance driver, the watchdog is disabled and
will be retriggered internally.
4
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
DETAILED DESCRIPTION (continued)
Saving Current While Using the Watchdog
The watchdog input is internally driven low during the first 7/8 of the watchdog time-out period, then momentarily
pulses high, resetting the watchdog counter. For minimum watchdog input current (minimum overall power
consumption), leave WDI low for the majority of the watchdog time-out period, pulsing it low-high-low once within
7/8 of the watchdog time-out period to reset the watchdog timer. If instead WDI is externally driven high for the
majority of the time-out period, a current of 5 V/40 kΩ 9 125 µA can flow into WDI.
V
DD
V
IT
t
t
t
WDI
t
(tout)
RESET
t
d
t
d
Figure 1. Watchdog Timing
Power-Fail Comparator (PFI and PFO)
An additional comparator is provided to monitor voltages other than the nominal supply voltage. The
power-fail-input (PFI) will be compared with an internal voltage reference of 1.25 V. If the input voltage falls
below the power-fail threshold (VPFI) of typ. 1.25 V, the power-fail output (PFO) goes low. If it goes above 1.25 V
plus about 10 mV hysteresis, the output returns to high. By connecting two external resistors, it is possible to
supervise any voltages above 1.25 V. The sum of both resistors should be about 1 MΩ, to minimize power
consumption and also to assure that the current in the PFI pin can be neglected compared with the current
through the resistor network. The tolerance of the external resistors should be not more than 1% to ensure
minimal variation of sensed voltage. If the power-fail comparator is unused, connect PFI to ground and leave
PFO unconnected.
V
(SENSE)
R1
1%
V
CC
PFI
PFO
TPS3306
GND
R2
1%
R + R
1
2
V
= 1.25 V ×
PFI,trip
R
2
5
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1)
UNIT
7 V
(2)
Supply voltage, VDD (see
)
(2)
All other pins (see
)
-0.3 V to 7 V
5 mA
Maximum low output current, IOL
Maximum high output current, IOH
Input clamp current, IIK (VI < 0 or VI > VDD
- 5 mA
)
±20 mA
±20 mA
Output clamp current, IOK (VO < 0 or VO > VDD
Continuous total power dissipation
Operating free-air temperature range, TA
Storage temperature range, Tstg
Soldering temperature
)
See Dissipation Rating Table
-40°C to 85°C
-65°C to 150°C
260°C
(1) Stresses beyond 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 beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to GND. For reliable operation, the device must not be operated at 7 V for more than t = 1000 h
continuously.
DISSIPATION RATING TABLE
T
A ≤ 25°C
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 85°C
POWER RATING
PACKAGE
POWER RATING
DGK
D
424 mW
3.4 mW/°C
5.8 mW/°C
271 mW
464 mW
220 mW
377 mW
725 mW
RECOMMENDED OPERATING CONDITIONS
at specified temperature range
MIN
MAX
UNIT
Supply voltage, VDD
2.7
6
V
V
Input voltage at WDI and PFI, VI
Input voltage at SENSE1 and SENSE2, VI
High-level input voltage at WDI, VIH
Low-level input voltage at WDI, VIL
Operating free-air temperature range, TA
0
0
VDD + 0.3
(VDD + 0.3)VIT/1.25 V
V
0.7 x VDD
V
0.3 × VDD
V
-40
85
°C
6
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
ELECTRICAL CHARACTERISTICS
over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VDD = 2.7 V to 6 V, IOL = 20 µA
VDD = 3.3 V, IOL= 2 mA
MIN
TYP
MAX
0.2
UNIT
V
RESET,
PFO
VOL
Low-level output voltage
0.4
0.4
VDD = 6 V, IOL = 3 mA
(1)
Power-up reset voltage (see
)
V
DD ≥ 1.1 V, IOL = 20 µA
0.4
V
1.37
1.64
1.81
2.20
2.86
4.46
1.22
1.37
1.64
1.81
2.20
2.86
4.46
1.22
1.40
1.43
1.72
1.89
2.30
3
1.68
1.85
2.25
2.93
4.55
1.25
1.40
1.68
1.85
2.25
2.93
4.55
1.25
10
VSENSE1
VSENSE2
,
VDD = 2.7 V to 6 V
TA = 0°C to 85°C
V
4.64
1.28
1.44
1.73
1.90
2.32
3.02
4.67
1.29
PFI
Negative-going input threshold voltage
VIT
(2)
(see
)
VSENSE1
,
VDD = 2.7 V to 6 V
TA = -40°C to 85°C
VSENSE2
V
PFI
PFI
VIT = 1.25 V
VIT = 1.40 V
VIT = 1.68 V
VIT = 1.86 V
VIT = 2.25 V
VIT = 2.93 V
VIT = 4.55 V
15
15
Vhys
Hysteresis
20
mV
VSENSEn
20
30
40
WDI = VDD = 6 V, Time average
(dc = 88%)
IH(AV) Average high-level input current
100
-15
150
-20
WDI
WDI
µA
µA
WDI = 0 V, VDD = 6 V, Time
average (dc = 12%)
IL(AV)
Average low-level input current
High-level input current
WDI = VDD = 6 V
120
5
170
8
IH
SENSE1
SENSE2
WDI
VSENSE1 = VDD = 6 V
VSENSE2 = VDD = 6 V
WDI = 0 V, VDD, = 6 V
VDD = 6 V, 0 V ≤ VI ≤ VDD
6
9
IL
Low-level input current
Input current
-120
-170
25
40
µA
nA
µA
pF
II
PFI
-25
IDD
Ci
Supply current
15
10
Input capacitance
VI = 0 V to VDD
(1) The lowest supply voltage at which RESET becomes active. tr, VDD ≥ 15 µs/V.
(2) To ensure best stability of the threshold voltage, a bypass capacitor (ceramic 0.1 µF) should be placed close to the supply terminals.
7
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
TIMING REQUIREMENTS
at VDD = 2.7 V to 6 V, RL= 1 MΩ, CL= 50 pF, TA= 25°C
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
SENSEn
WDI
VSENSEnL = VIT - 0.2 V, VSENSEnH = VIT + 0.2 V
6
µs
ns
tw
Pulse width
VIH = 0.7 × VDD, VIL= 0.3 × VDD
100
SWITCHING CHARACTERISTICS
at VDD = 2.7 V to 6 V, RL= 1 MΩ, CL = 50 pF, TA= 25°C
PARAMETER
TEST CONDITIONS
I(SENSEn) ≥ VIT + 0.2 V,
See timing diagram
I(SENSEn) ≥ VIT + 0.2 V,
MIN
TYP
0.8
MAX
1.2
UNIT
V
tt(out)
td
Watchdog time out
Delay time
0.5
s
V
70
100
1
140
5
ms
µs
See timing diagram
Propagation (delay) time,
high-to-low level output
tPHL
tPHL
tPLH
SENSEn to RESET
PFI to PFO
VIH = VIT + 0.2 V, VIL = VIT - 0.2 V
Propagation (delay) time,
high-to-low level output
0.5
1
µs
Propagation (delay) time,
low-to-high level output
8
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
TYPICAL CHARACTERISTICS
NORMALIZED SENSE THRESHOLD VOLTAGE
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
vs
FREE-AIR TEMPERATURE AT VDD
18
16
14
12
10
8
1.005
1.004
1.003
1.002
1.001
1
V
DD
= 6 V
TPS3306−33
6
4
2
0.999
0.998
0.997
0
−2
−4
SENSEn = V
DD
−6
T = 25°C
A
0.996
0.995
−8
−10
−0.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7
−40
−15
10
35
60
85
V − Supply Voltage − V
DD
T
A
− Free-Air Temperature − °C
Figure 2.
Figure 3.
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT
2.8
2.4
2
6.5
6
V
DD
= 2.7 V
V
DD
= 6 V
5.5
5
4.5
4
1.6
1.2
0.8
0.4
0
3.5
3
85°C
85°C
2.5
2
−40°C
1.5
1
−40°C
0.5
0
0
5
10 15 20 25 30 35 40 45 50 55 60
0
1
2
3
4
5
6
7
8
9 10 11 12 13
I
− Low-Level Output Current − mA
I
− Low-Level Output Current − mA
OL
OL
Figure 4.
Figure 5.
9
TPS3306-15
TPS3306-18, TPS3306-20
TPS3306-25, TPS3306-33
www.ti.com
SLVS290A–APRIL 2000–REVISED MAY 2004
TYPICAL CHARACTERISTICS (continued)
MINIMUM PULSE DURATION AT SENSE
vs
THRESHOLD OVERDRIVE
10
9
V
= 6 V
DD
8
7
6
5
4
3
2
1
0
0
100 200 300 400 500 600 700 800 900 1000
SENSE − Threshold Overdrive − mV
Figure 6.
10
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Audio
Amplifiers
amplifier.ti.com
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
Digital Control
Military
www.ti.com/broadband
www.ti.com/digitalcontrol
www.ti.com/military
Interface
Logic
interface.ti.com
logic.ti.com
Power Mgmt
Microcontrollers
power.ti.com
Optical Networking
Security
www.ti.com/opticalnetwork
www.ti.com/security
www.ti.com/telephony
www.ti.com/video
microcontroller.ti.com
Telephony
Video & Imaging
Wireless
www.ti.com/wireless
Mailing Address:
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright 2004, Texas Instruments Incorporated
相关型号：
TPS3306-33DG4
Dual-Processor Supervisory Circuit with Power-Fail and Watchdog Timer 8-SOIC -40 to 85
TI
TPS3306-33DGKG4
Dual-Processor Supervisory Circuit with Power-Fail and Watchdog Timer 8-VSSOP -40 to 85
TI
©2020 ICPDF网 联系我们和版权申明