AIC809/AIC810
3-Pin Microprocessor Reset Circuits
Analog Integrations Corporation Si-Soft Research Center DS-809P-02 010405
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 1
FEATURES
Ultra Low Supply Current 1µA(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
APPLICATIONS
Notebook Computers
Digital Still Cameras
PDAs
Critical Microprocessor Monitoring
DESCRIPTION
AIC809/AIC810 are low-power microprocessor (µP)
supervisory circuits used to monitor power supplies in
µP and digital systems. They provide applications with
benefits of circuit reliability and low cost by eliminating
external components.
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
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 (1µA) makes AIC809/AIC810 ideal
for portable equipment. The devices are available in
SOT-23 package.
TYPICAL APPLICATION CIRCUIT
Push-Pull Output
VCC VCC
GND
GND
µP
RESET
INPUT
RESET
(RESET)
VCC
AIC809
(AIC810)
AIC809/AIC810
ORDERING INFORMATION
AIC809X-XXXXXX
AIC810
-XXXXXX
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
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.)
21
3
SOT-23 Marking
Part No. Marking Part No. Marking Part No. Marking
AIC809-23CU RA23
AIC809N23CU RB23 AIC810-23CU RD23
AIC809-26CU RA26 AIC809N26CU RB26 AIC810-26CU RD26
AIC809-29CU RA29 AIC809N29CU RB29 AIC810-29CU RD29
AIC809-31CU RA31 AIC809N31CU RB31 AIC810-31CU RD31
AIC809-40CU RA40 AIC809N40CU RB40 AIC810-40CU RD40
AIC809-44CU RA44 AIC809N44CU RB44 AIC810-44CU RD44
AIC809-46CU RA46 AIC809N46CU RB46 AIC810-46CU RD46
2
AIC809/AIC810
Part No. Marking Part No. Marking Part No. Marking
AIC809-23PU RA23P
AIC809N23PU RB23P AIC810-23PU RD23P
AIC809-26PU RA26P AIC809N26PU RB26P AIC810-26PU RD26P
AIC809-29PU RA29P AIC809N29PU RB29P AIC810-29PU RD29P
AIC809-31PU RA31P AIC809N31PU RB31P AIC810-31PU RD31P
AIC809-40PU RA40P AIC809N40PU RB40P AIC810-40PU RD40P
AIC809-44PU RA44P AIC809N44PU RB44P AIC810-44PU RD44P
AIC809-46PU RA46P AIC809N46PU RB46P AIC810-46PU RD46P
ABSOLUTE MAXIMUM RATINGS
VCC -0.3V ~6.5V
RESET, RESET -0.3V ~ (VCC+0.3V)
Input Current (VCC) 20mA
Output Current (RESET or RESET ) 20mA
Continuous Power Dissipation (TA = +70°C) 320mW
Operating Junction Temperature Range -40°C ~ 85°C
Junction Temperature 125°C
Storage Temperature Range - 65°C ~ 150°C
Lead Temperature (Soldering) 10 sec 260°C
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
RESET
VCC
GND
A
IC809
VIN
IIN
3
AIC809/AIC810
ELECTRICAL CHARACTERISTICS
4
(Typical values are at TA=25°C, unless otherwise specified.) (Note 1)
PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT
Operating Voltage Range VCC 0.9 6 V
Supply Current ICC V
CC = VTH +0.1V 1 3 µA
TA=+25°C 2.265 2.3 2.335
AIC809-23 TA= -40°C to +85°C 2.254 2.346
TA=+25°C 2.561 2.6 2.639
AIC809-26 TA= -40°C to +85°C 2.548 2.652
TA=+25°C 2.857 2.9 2.944
AIC809-29 TA= -40°C to +85°C 2.842 2.958
TA=+25°C 3.054 3.1 3.147
AIC809-31 TA= -40°C to +85°C 3.038 3.162
TA=+25°C 3.940 4.0 4.060
AIC809-40 TA= -40°C to +85°C 3.920 4.080
TA=+25°C 4.334 4.4 4.466
AIC809-44 TA= -40°C to +85°C 4.312 4.488
TA=+25°C 4.531 4.6 4.669
Reset Threshold VTH
AIC809-46 TA=-40°C to +85°C 4.508 4.692
V
VCC to Reset Delay TRD V
CC=VTH to (VTH -0.1V), VTH=3.1V 20 µS
TA=+25°C 140 230 560
Reset Active Timeout Period TRP V
CC = VTH (MAX) TA= -40°C to +85°C 100 1030 mS
VOH V
CC=VTH+0.1V, ISOURCE=1mA 0.8VCC
RESET Output Voltage VOL V
CC=VTH - 0.1V, ISINK=1mA 0.2Vcc V
VOH VCC=VTH-0.1V, ISOURCE=1mA 0.8VCC
RESET Output Voltage
VOL VCC=VTH+0.1V, ISINK=1mA 0.2Vcc
V
Note1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C 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.
AIC809/AIC810
TYPICAL PERFORMANCE CHARACTERISTICS
5
-40 -20 0 20 40 60 80 100
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
VTH=2.3V
VTH=3.1V
VTH=4.6V
Su
pp
l
y
Current
(
µ
A
)
Temperature (°C)
Fig 1 Supply Current vs. Temperature
Power-Down Reset Delay (µS)
Fig 2 Power-Down Reset Delay vs. Temperature
-60 -40 -20 020 40 60 80 100
0
10
20
30
40
50
60
70
80
90
100
110
120
VOD=200mV
VOD=100mV
VOD=50mV
Temperature (°C)
VTH=2.3V
VOD=VTH-VCC
Power-Down Reset Delay (µS)
Temperature (°C)
Fig 3 Power-Down Reset Delay vs. Temperature
-60 -40 -20 0 20 40 60 80 100
0
20
40
60
80
100
120
140
160
180
200
220
240
VOD=200mV
VOD=100mV
VOD=50mV
VTH=3.1V
VOD=VTH-VCC
Power-Down Reset Delay (µS)
Temperature (°C)
Fig 4 Power-Down Reset Delay vs. Temperature
-60 -40 -20 020 40 60 80 100
0
100
200
300
400
VOD=200mV
VOD=100mV
VOD=50mV VTH=4.6V
VOD=VTH-VCC
Normalized Reset Threshold (V)
Temperature (°C)
Fig 5 Normalized Reset Threshold vs. Temperature
-40 -20 0 20 40 60 80 100
0.985
0.990
0.995
1.000
1.005
1.010
1.015
VTH=3.1V
VTH=2.3V
VTH=4.6V
Power-Up Reset Timeout (mS)
Temperature (°C)
Fig 6 Power-Up Reset Timeout vs. Temperature
-60 -40 -20 020 40 60 80 100
0
100
200
300
400
500
600
VTH=2.3V
VTH=3.1V
VTH=4.6V
AIC809/AIC810
BLOCK DIAGRAMS
NMOS
R2
R1
Reset Generator
-
+
Bandgap
RESET
GND
VCC
N-ch Open-Drain Type
R2
R1
Reset Generator
-
+
Bandgap
RESET
(RESET)
GND
VCC
Push-Pull Type
6
AIC809/AIC810
PIN DESCRIPTIONS
7
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
μP will be activated at a valid reset state. These
μP 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 5V±10% or
3V±10% are ideal for systems using a 5V±5% 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 μP 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
μ
P WITH BIDIRECTIONAL
RESET PINS
The RESET output on the AIC809N is open drain,
this device interfaces easily with μPs that have
bidirectional reset pins. Connecting the μP
supervisor’s RESET output directly to the
microcontroller’s RESET pin with a single pull-up
resistor allows either device to assert reset.
AIC809/AIC810
0°
0.90
0.30
1.50
2.60
2.80
0.08
0.30
0.05
e
θ
L1
L
e1
c
E
E1
D
b
A2
A1
0.95 BSC
8°
0.60
1.90 BSC
0.60 REF
1.30
1.70
3.00
3.00
0.22
0.50
0.15
0.95
MIN.
S
Y
M
B
O
L
A 1.45
MAX.
SOT-23
MILLIMETERS
c
A
A2
b
WITH PLATING
0.25
A1
SECTION A-A
BASE METAL
e1
e
D
E
AA
E1
SEE VIEW B
PHYSICAL DIMENSIONS (unit: mm)
SOT-23
8
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.
VIEW B
θ
L1
L
SEATING PLANE
GAUGE PLANE
