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AIC811/AIC812
Reset Circuits with Manual Reset Input
FEATURES
Ultra Low Supply Current 1A(typ.) Guaranteed Reset Valid to Vcc=0.9V Available in two Output Types: Push-Pull Active Low (AIC811), Push-Pull Active High (AIC812) 140ms Min. Power-On Reset Pulse Width Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V, 4.4V, and 4.6V Tight Voltage Threshold Tolerance: 1.5% Low profile Package: SOT-23-5
These devices perform as valid singles in applications with Vcc ranging from 6.0V down to 0.9V. The reset
DESCRIPTION
AIC811/AIC812 are low-power microprocessor (P) supervisory circuits used to monitor power supplies in P and digital systems. They provide applications with benefits of circuit reliability and low cost by eliminating external components. AIC811/AIC812 also offer a manual reset input.
APPLICATIONS
Notebook Computers Digital Still Cameras PDAs Critical Microprocessor Monitoring
signal lasts for a minimum period of 140ms whenever VCC supply voltage falls below preset threshold. Both AIC811 and AIC812 were designed with a reset comparator to help identify invalid signals, which last less than 140ms. The only difference between them is that they have an active-low RESET output and active-high RESET output, respectively.
Low supply current (1A) makes AIC811/AIC812 ideal for portable equipment. The devices are available in SOT-23-5 package.
TYPICAL APPLICATION CIRCUIT
VCC VCC AIC811 (AIC812) RESET (RESET) MR GND VCC P RESET INPUT GND
Pushbutton Switch
Analog Integrations Corporation
Si-Soft Research Center 3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C. TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
DS-811P-03 010405
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AIC811/AIC812
ORDERING INFORMATION
AIC811-XXXXXX AIC812-XXXXXX PACKING TYPE TR: TAPE & REEL BG: BAG PACKAGE TYPE V: SOT-23-5 C: COMMERCIAL P: LEAD FREE COMMERCIAL RESET THRESHOLD VOLTAGE 23: 2.3V 26: 2.6V 29: 2.9V 31: 3.1V 40: 4.0V 44: 4.4V 46: 4.6V (Additional voltage versions with a unit of 0.1V within the voltage range from 1.5V to 5.5V for this product line may be available on demand with prior consultation with AIC.) Example: AIC811-31CVTR 3.1V version, in SOT-23-5 Package & Tape & Reel Packing Type AIC811-31PVTR 3.1V version, in Lead Free SOT-23-5 Package & Tape & Reel Packing Type PIN CONFIGURATION SOT-23-5 TOP VIEW 1: GND 2: NC 3: RESET (RESET) 4: MR 5: VCC
5
4
1
2
3
SOT-23-5 Marking
Part No. AIC811-23CV AIC811-26CV AIC811-29CV AIC811-31CV AIC811-40CV AIC811-44CV AIC811-46CV Marking BQ23 BQ26 BQ29 BQ31 BQ40 BQ44 BQ46 Part No. AIC812-23CV AIC812-26CV AIC812-29CV AIC812-31CV AIC812-40CV AIC812-44CV AIC812-46CV Marking BR23 BR26 BR29 BR31 BR40 BR44 BR46
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AIC811/AIC812
Part No. AIC811-23PV AIC811-26PV AIC811-29PV AIC811-31PV AIC811-40PV AIC811-44PV AIC811-46PV Marking BQ23P BQ26P BQ29P BQ31P BQ40P BQ44P BQ46P Part No. AIC812-23PV AIC812-26PV AIC812-29PV AIC812-31PV AIC812-40PV AIC812-44PV AIC812-46PV Marking BR23P BR26P BR29P BR31P BR40P BR44P BR46P
ABSOLUTE MAXIMUM RATINGS
VCC RESET, RESET Input Current (VCC, MR ) Output Current (RESET or RESET ) Continuous Power Dissipation (TA = +70C) Operating Junction Temperature Range Junction Temperature Storage Temperature Range Lead Temperature (Soldering) 10 sec -0.3V ~6.5V -0.3V ~ (VCC+0.3V) 20mA 20mA 320mW -40C ~ 85C 125C - 65C ~ 150C 260C
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
1 2 3
GND VCC NC MR RESET
5 4 Iin
Vin
AIC811 Pushbuttom Switch
3
AIC811/AIC812
ELECTRICAL CHARACTERISTICS
(Typical values are at TA=25C, unless otherwise specified) (Note 1) PARAMETER Operating Voltage Range Supply Current
SYMBOL
TEST CONDITIONS VCC = VTH +0.1V AIC811-23 AIC811-26 AIC811-29 TA=+25C TA= -40C to +85C TA=+25C TA= -40C to +85C TA=+25C TA= -40C to +85C TA=+25C TA= -40C to +85C TA=+25C TA= -40C to +85C TA=+25C TA= -40C to +85C TA=+25C TA=-40C to +85C
MIN. 0.9
TYP. 1
MAX. 6 3 2.335 2.346 2.639 2.652 2.944 2.958 3.147 3.162 4.060 4.080 4.466 4.488 4.669 4.692
UNIT V A
VCC ICC
2.265 2.254 2.561 2.548 2.857 2.842 3.054 3.038 3.940 3.920 4.334 4.312 4.531 4.508
2.3 2.6 2.9 3.1 4.0 4.4 4.6
Reset Threshold
VTH
AIC811-31 AIC811-40 AIC811-44 AIC811-46
V
VCC to Reset Delay Reset Active Timeout Period
TRD TRP TMD VIH VIL
VCC=VTH to (VTH -0.1V), VTH=3.1V VCC TA=+25C = VTH(MAX) TA= -40C to +85C Vcc=6V 0.7VCC 140 100
20 230 560 1030 0.5
S mS S V K V V
MR to Reset Propagation
Delay
MR Input Threshold MR Pull-Up Resistance RESET Output Voltage
0.25VCC 10 20 30 0.2Vcc 0.8VCC 0.2Vcc VCC=VTH+0.1V, ISOURCE=1mA VCC=VTH - 0.1V, ISINK=1mA VCC=VTH+0.1V, ISOURCE=1mA VCC=VTH - 0.1V, ISINK=1mA 0.8VCC
VOH VOL VOH VOL
RESET Output Voltage
Note1: Specifications are production tested at TA=25C. Specifications over the -40C to 85C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). Note2: RESET output is for AIC811; RESET output is for AIC812.
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AIC811/AIC812
TYPICAL PERFORMANCE CHARACTERISTICS
1.5
120
Power-Down Reset Delay (S)
1.4 1.3
110 100 90 80 70 60 50 40 30 20 10 0 -60 -40 -20 0 20 40
VTH=2.3V
VTH=2.3V VOD=VTH-VCC
Supply Current (A)
1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 -40 -20 0 20
VTH=3.1V VTH=4.6V
VOD=50mV VOD=100mV VOD=200mV
40
60
80
100
60
80
100
Temperature (C) Fig 1 Supply Current vs. Temperature
Temperature (C) Fig 2 Power-Down Reset Delay vs. Temperature
240
Power-Down Reset Delay (S)
Power-Down Reset Delay (S)
220 200 180 160 140 120 100 80 60 40 20 0
-60 -40 -20
VTH=3.1V VOD=VTH-VCC
400
VOD=50mV
VTH=4.6V VOD=VTH-VCC
300
VOD=50mV
200
VOD=100mV
VOD=100mV VOD=200mV
0 20 40 60 80
100
100
VOD=200mV
0
-60 -40 -20 0
20
40
60
80
100
Temperature (C) Fig 3 Power-Down Reset Delay vs. Temperature
Temperature (C) Fig 4 Power-Down Reset Delay vs. Temperature
600
Normalized Reset Threshold (V)
1.010 1.005 1.000 0.995 0.990 0.985 -40 -20 0
VTH=4.6V
Power-Up Reset Timeout (mS)
1.015
500 400
VTH=3.1V
300 200
VTH=3.1V
VTH=4.6V
VTH=2.3V
VTH=2.3V
100 0 -60 -40 -20 0 20 40 60 80 100
20
40
60
80
100
Temperature (C) Fig 5 Normalized Reset Threshold vs. Temperature
Temperature (C) Fig 6 Power-Up Reset Timeout vs. Temperature
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AIC811/AIC812
BLOCK DIAGRAM
VCC
RESET (RESET)
R1
Bandgap
+
Reset Generator
R2
RPULL_UP 20K
GND
MR
PIN DESCRIPTIONS
GND Pin : RESET Pin (AIC811) : RESET Pin (AIC812)
MR Pin
: :
Vcc Pin
:
Ground. Active low output pin. RESET Output remains low while Vcc below reset threshold. Active high output pin. RESET output remains high while Vcc below reset threshold. Logic low manual reset input. This active-low input has an internal 20k pull-up resistor. It can be driven by a TTL or CMOS, or shorted to ground with a switch. Leave open when unused. Supply voltage.
DETAILED DESCRIPTIONS OF TECHNICAL TERMS
RESET OUTPUT P will be activated at a valid reset state. These P supervisory circuits assert reset to prevent code execution errors during power-up, power-down, or brownout conditions.
RESET is guaranteed to be a logic low for
VTH>VCC>0.9V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high.
If a brownout condition occurs (VCC drops below the reset threshold), RESET goes low. Any time VCC goes below the reset threshold, the internal timer resets to zero, and RESET goes low. The internal timer is activated after VCC returns above the reset threshold, and RESET remains low for the reset timeout period. The manual reset input ( MR ) can also initiate a reset. AIC812 has an active-high RESET output that is the inverse of AIC811's RESET output.
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AIC811/AIC812
MANUAL RESET INPUT Many P-based products require manual reset capability, allowing operators, test technicians, or external logic circuitry to initiate a reset. Logic low on MR asserts reset. Reset will remain asserted for the Reset Active Timeout Period (tRP) after MR returns high. This input has an internal 20K pull-up resistor, so it can be floating if it is not used. MR can be driven with TTL or CMOS-logic levels, or with open-drain/collector outputs. Another alternative is to connect a normal switch from MR to GND to create a manual reset function. Connecting a 0.1F capacitor from MR to ground can provide noise immunity to prevent noise caused by long cables of MR or noisy environment. BENEFITS OF HIGHLY ACCURATE RESET THRESHOLD AIC811/812 with specified voltage as 5V10% or 3V10% are ideal for systems using a 5V5% or 3V 5% power supply. The reset is guaranteed to assert after the power supply falls out of regulation, but before power drops below the minimum specified operating voltage range of the system ICs. The pre-trimmed thresholds are reducing the range over which an undesirable reset may occur.
APPLICATION INFORMATION
NEGATIVE-GOING VCC TRANSIENTS In addition to issuing a reset to the P during power-up, power-down, and brownout conditions, AIC811 series are relatively resistant to short-duration negative-going VCC transient. ENSURING A VALID RESET OUTPUT DOWN TO VCC=0 When VCC falls below 0.9V, AIC811 RESET output no longer sinks current; it becomes an open circuit. In this case, high-impedance CMOS logic inputs connecting to RESET can drift to undetermined voltages. Therefore, AIC811/2 with CMOS is perfect for most applications of VCC below 0.9V. However in applications where
RESET must be valid down to 0V, adding a
pull-down resistor to RESET causes any leakage currents to flow to ground, holding RESET low. INTERFACING TO P WITH BIDIRECTIONAL RESET PINS Ps with bidirectional reset pins can contend with AIC811/812 reset outputs. If AIC811 RESET output is asserted high and the P wants to pull it low, indeterminate logic levels may occur. To correct such cases, connect a resistor between AIC811 RESET (or AIC812 RESET) output and theP reset I/O. Buffer the reset output to other system components.
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AIC811/AIC812
PHYSICAL DIMENSIONS (unit: mm)
SOT-23-5
D
S Y M B O L
SOT-25 MILLIMETERS MIN. 0.95 0.05 0.90 0.30 0.08 2.80 2.60 1.50 0.95 BSC 1.90 BSC 0.30 0.60 REF 0 8 0.60 MAX. 1.45 0.15 1.30 0.50 0.22 3.00 3.00 1.70
A
E1
A1 A2 b
E
A
A
e e1
SEE VIEW B
c D E
b A2
WITH PLATING
E1 e
A
c
e1
BASE METAL SECTION A-A
L L1
A1
0.25 L L1
VIEW B GAUGE PLANE SEATING PLANE
Note:
Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
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