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AIC809/AIC810
3-Pin Microprocessor Reset Circuits
FEATURES
Ultra Low Supply Current 1A(typ.) Guaranteed Reset Valid to Vcc=0.9V Available in Three Output Type: Open-Drain Active Low (AIC809N), Push-Pull Active Low (AIC809), Push-Pull Active High (AIC810) 140ms Min. Power-On Reset Pulse Width Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V, 4.4V, 4.6V Tight Voltage Threshold Tolerance: 1.5% Tiny Package in SOT-23
These devices perform as valid singles in applications with Vcc ranging from 6.0V down to 0.9V. The reset signal lasts for a minimum period of 140ms whenever VCC supply voltage falls below preset threshold. Both
DESCRIPTION
AIC809/AIC810 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.
APPLICATIONS
Notebook Computers Digital Still Cameras PDAs Critical Microprocessor Monitoring
AIC809 and AIC810 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 AIC809/AIC810 ideal for portable equipment. The devices are available in SOT-23 package.
TYPICAL APPLICATION CIRCUIT
VCC VCC AIC809 (AIC810) RESET (RESET) GND VCC P RESET INPUT GND
Push-Pull Output
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-809P-02 010405
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AIC809/AIC810
ORDERING INFORMATION
AIC809X-XXXXXX AIC810 -XXXXXX PACKING TYPE TR: TAPE & REEL BG: BAG PACKAGE TYPE U: SOT-23 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 OUTPUT TYPE DEFAULT: Push-Pull type N: N-ch Open-Drain type (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: AIC809-31-CUTR 3.1V and push-pull version, in SOT-23 Package & Tape & Reel Packing Type AIC809-31-PUTR 3.1V and push-pull version, in Lead Free SOT-23 Package & Tape & Reel Packing Type PIN CONFIGURATION SOT-23 TOP VIEW 1: GND 2: RESET (RESET) 3: VCC
3
1
2
SOT-23 Marking
Part No. AIC809-23CU AIC809-26CU AIC809-29CU AIC809-31CU AIC809-40CU AIC809-44CU AIC809-46CU Marking RA23 RA26 RA29 RA31 RA40 RA44 RA46 Part No. AIC809N23CU AIC809N26CU AIC809N29CU AIC809N31CU AIC809N40CU AIC809N44CU AIC809N46CU Marking RB23 RB26 RB29 RB31 RB40 RB44 RB46 Part No. AIC810-23CU AIC810-26CU AIC810-29CU AIC810-31CU AIC810-40CU AIC810-44CU AIC810-46CU Marking RD23 RD26 RD29 RD31 RD40 RD44 RD46
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AIC809/AIC810
Part No. AIC809-23PU AIC809-26PU AIC809-29PU AIC809-31PU AIC809-40PU AIC809-44PU AIC809-46PU
Marking RA23P RA26P RA29P RA31P RA40P RA44P RA46P
Part No. AIC809N23PU AIC809N26PU AIC809N29PU AIC809N31PU AIC809N40PU AIC809N44PU AIC809N46PU
Marking RB23P RB26P RB29P RB31P RB40P RB44P RB46P
Part No. AIC810-23PU AIC810-26PU AIC810-29PU AIC810-31PU AIC810-40PU AIC810-44PU AIC810-46PU
Marking RD23P RD26P RD29P RD31P RD40P RD44P RD46P
ABSOLUTE MAXIMUM RATINGS
VCC RESET, RESET Input Current (VCC) 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
A IC 8 0 9
V IN
I IN
VCC
RESET GND
3
AIC809/AIC810
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 AIC809-23 AIC809-26 AIC809-29 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 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 20
Reset Threshold
VTH
AIC809-31 AIC809-40 AIC809-44 AIC809-46
V
VCC to Reset Delay Reset Active Timeout Period
RESET Output Voltage
TRD TRP VOH VOL VOH VOL
VCC=VTH to (VTH -0.1V), VTH=3.1V VCC = VTH (MAX) 140 100 0.8VCC
S 560 1030 0.2Vcc mS V V
230
VCC=VTH+0.1V, ISOURCE=1mA VCC=VTH - 0.1V, ISINK=1mA VCC=VTH-0.1V, ISOURCE=1mA VCC=VTH+0.1V, ISINK=1mA
RESET Output Voltage
0.8VCC 0.2Vcc
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 AIC809; RESET output is for AIC810.
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AIC809/AIC810
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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AIC809/AIC810
BLOCK DIAGRAMS
VCC
R1
Bandgap
+
RESET
Reset Generator
NMOS
R2
GND
N-ch Open-Drain Type
VCC
R1
Bandgap
+
Reset Generator
RESET (RESET)
R2
GND
Push-Pull Type
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AIC809/AIC810
PIN DESCRIPTIONS
GND Pin : Ground. RESET Pin (AIC809) : Active low output pin. RESET Output remains low while Vcc is below the reset threshold. RESET Pin (AIC810) : Active high output pin. RESET output remains high while Vcc is below the reset threshold. Vcc Pin : Supply voltage.
DETAIL 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. BENEFITS OF HIGHLY ACCURATE RESET THRESHOLD AIC809/810 with specified voltage as 5V10% or 3V10% are ideal for systems using a 5V5% or 3V5% 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, AIC809 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, AIC809 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, AIC809/810 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 The RESET output on the AIC809N is open drain, this device interfaces easily with Ps that have bidirectional reset pins. Connecting the P supervisor's RESET output directly to the microcontroller's RESET pin with a single pull-up resistor allows either device to assert reset.
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AIC809/AIC810
PHYSICAL DIMENSIONS (unit: mm)
SOT-23
D e
S Y M B O L
SOT-23 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 c
A
A
e1
E
SEE VIEW B
D E
b A2
WITH PLATING
E1 e
A
c
e1 L L1
BASE METAL SECTION A-A
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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