AIC811/AIC812
Reset Circuits with Manual Reset Input
FEATURES
DESCRIPTION
Ultra Low Supply Current 1µA(typ.)
AIC811/AIC812 are low-power microprocessor (µP)
Guaranteed Reset Valid to Vcc=0.9V
supervisory circuits used to monitor power supplies in
Available in two Output Types: Push-Pull Active
µP and digital systems. They provide applications with
Low (AIC811), Push-Pull Active High (AIC812)
benefits of circuit reliability and low cost by eliminating
140ms Min. Power-On Reset Pulse Width
Internally Fixed Threshold 2.3V, 2.6V, 2.7V,
external components. AIC811/AIC812 also offer a
2.9V, 3.1V, 4.0V, 4.4V, and 4.6V
manual reset input.
Tight Voltage Threshold Tolerance: 1.5%
Low Profile Package: SOT-23-5, SOT-143,
These devices perform as valid singles in applications
SOT-23-6.
with Vcc ranging from 6.0V down to 0.9V. The reset
signal lasts for a minimum period of 140ms whenever
APPLICATIONS
VCC supply voltage falls below preset threshold. Both
Notebook Computers
AIC811 and AIC812 were designed with a reset
Digital Still Cameras
comparator to help identify invalid signals, which last
PDAs
less than 140ms. The only difference between them is
Critical Microprocessor Monitoring
that they have an active-low RESET output and
active-high RESET output, respectively.
Low supply current (1µA) makes AIC811/AIC812 ideal
for portable equipment. The devices are available in
SOT-23-5,SOT143,SOT-23-6 package.
TYPICAL APPLICATION CIRCUIT
VCC
VCC
VCC
AIC811
(AIC812)
RESET
MR (RESET)
µP
RESET
INPUT
GND
GND
Pushbutton
Switch
Analog Integrations Corporation
Si-Soft Research Center
DS-811G-01 092408
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
AIC811/AIC812
ORDERING INFORMATION
AIC811-XXXXXX
AIC812-XXXXXX
PIN CONFIGURATION
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
V: SOT-23-5
U4:SOT-143
G: SOT-23-6
P: LEAD FREE COMMERCIAL
G: GREEN PACKAGE
RESET THRESHOLD VOLTAGE
23: 2.3V
26: 2.6V
27: 2.7V
29: 2.9V
31: 3.1V
40: 4.0V
44: 4.4V
46: 4.6V
SOT-23-5
TOP VIEW
1: GND
2: NC
3: RESET (RESET)
4: MR
5: VCC
SOT-143
TOP VIEW
1: GND
2: RESET (RESET)
3: MR
4: VCC
SOT-23-6
TOP VIEW
1: VCC
2: GND
3: NC
4: NC
5: MR
6: RESET (RESET)
5
1
4
2
3
4
3
1
2
6
5
4
1
2
3
(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:
AIC811-31PVTR
3.1V version, in Lead Free SOT-23-5 Package & Tape & Reel Packing Type
2
AIC811/AIC812
SOT-23-5 Marking
Part No.
Marking
Part No.
Marking
AIC811-23PV
BQ23P
AIC812-23PV
BR23P
AIC811-26PV
BQ26P
AIC812-26PV
BR26P
AIC811-27PV
BQ27P
AIC812-27PV
BR27P
AIC811-29PV
BQ29P
AIC812-29PV
BR29P
AIC811-31PV
BQ31P
AIC812-31PV
BR31P
AIC811-40PV
BQ40P
AIC812-40PV
BR40P
AIC811-44PV
BQ44P
AIC812-44PV
BR44P
AIC811-46PV
BQ46P
AIC812-46PV
BR46P
Part No.
Marking
Part No.
Marking
AIC811-23GV
BQ23G
AIC812-23GV
BR23G
AIC811-26GV
BQ26G
AIC812-26GV
BR26G
AIC811-27GV
BQ27G
AIC812-27GV
BR27G
AIC811-29GV
BQ29G
AIC812-29GV
BR29G
AIC811-31GV
BQ31G
AIC812-31GV
BR31G
AIC811-40GV
BQ40G
AIC812-40GV
BR40G
AIC811-44GV
BQ44G
AIC812-44GV
BR44G
AIC811-46GV
BQ46G
AIC812-46GV
BR46G
Part No.
Marking
Part No.
Marking
AIC811-23PU4
RG23P
AIC812-23PU4
RH23P
AIC811-26PU4
RG26P
AIC812-26PU4
RH26P
AIC811-27PU4
RG27P
AIC812-27PU4
RH27P
AIC811-29PU4
RG29P
AIC812-29PU4
RH29P
AIC811-31PU4
RG31P
AIC812-31PU4
RH31P
AIC811-40PU4
RG40P
AIC812-40PU4
RH40P
AIC811-44PU4
RG44P
AIC812-44PU4
RH44P
AIC811-46PU4
RG46P
AIC812-46PU4
RH46P
SOT-143 Marking
3
AIC811/AIC812
Part No.
Marking
Part No.
Marking
AIC811-23GU4
RG23G
AIC812-23GU4
RH23G
AIC811-26GU4
RG26G
AIC812-26GU4
RH26G
AIC811-27GU4
RG27G
AIC812-27GU4
RH27G
AIC811-29GU4
RG29G
AIC812-29GU4
RH29G
AIC811-31GU4
RG31G
AIC812-31GU4
RH31G
AIC811-40GU4
RG40G
AIC812-40GU4
RH40G
AIC811-44GU4
RG44G
AIC812-44GU4
RH44G
AIC811-46GU4
RG46G
AIC812-46GU4
RH46G
Part No.
Marking
Part No.
Marking
AIC811-23PG
RK23P
AIC812-23PG
RL23P
AIC811-26PG
RK26P
AIC812-26PG
RL26P
AIC811-27PG
RK27P
AIC812-27PG
RL27P
AIC811-29PG
RK29P
AIC812-29PG
RL29P
AIC811-31PG
RK31P
AIC812-31PG
RL31P
AIC811-40PG
RK40P
AIC812-40PG
RL40P
AIC811-44PG
RK44P
AIC812-44PG
RL44P
AIC811-46PG
RK46P
AIC812-46PG
RL46P
Part No.
Marking
Part No.
Marking
AIC811-23GG
RK23G
AIC812-23GG
RL23G
AIC811-26GG
RK26G
AIC812-26GG
RL26G
AIC811-27GG
RK27G
AIC812-27GG
RL27G
AIC811-29GG
RK29G
AIC812-29GG
RL29G
AIC811-31GG
RK31G
AIC812-31GG
RL31G
AIC811-40GG
RK40G
AIC812-40GG
RL40G
AIC811-44GG
RK44G
AIC812-44GG
RL44G
AIC811-46GG
RK46G
AIC812-46GG
RL46G
SOT-23-6 Marking
4
AIC811/AIC812
ABSOLUTE MAXIMUM RATINGS
VCC
-0.3V ~6.5V
-0.3V ~ (VCC+0.3V)
RESET, RESET
Input Current (VCC, MR )
20mA
Output Current (RESET or RESET )
20mA
Continuous Power Dissipation (TA = +70°C)
320mW
-40°C ~ 85°C
Operating Junction Temperature Range
125°C
Junction Temperature
-65°C ~ 150°C
Storage Temperature Range
260°C
Lead Temperature (Soldering) 10 sec
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
GND
VCC
Iin
Vin
MR
RESET
AIC811 Pushbuttom
Switch
ELECTRICAL CHARACTERISTICS
(Typical values are at TA=25°C, unless otherwise specified) (Note 1)
PARAMETER
SYMBOL
Operating Voltage Range
VCC
Supply Current
ICC
Reset Threshold
VTH
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
6
V
1
3
µA
2.3
2.335
V
0.9
VCC = VTH +0.1V
AIC811-23
AIC811-26
AIC811-27
AIC811-29
TA=+25°C
2.265
TA= -40°C to +85°C
2.254
TA=+25°C
2.561
TA= -40°C to +85°C
2.548
TA=+25°C
2.660
TA= -40°C to +85°C
2.646
TA=+25°C
2.857
TA= -40°C to +85°C
2.842
AIC811-31 TA=+25°C
3.054
2.346
2.6
2.639
2.652
2.7
2.741
2.754
2.9
2.944
2.958
3.1
3.147
5
AIC811/AIC812
AIC811-40
AIC811-44
AIC811-46
TA= -40°C to +85°C
3.038
TA=+25°C
3.940
TA= -40°C to +85°C
3.920
TA=+25°C
4.334
TA=-40°C to +85°C
4.312
TA=+25°C
4.531
TA=-40°C to +85°C
4.508
VCC to Reset Delay
TRD
VCC=VTH to (VTH –0.1V),
VTH=3.1V
Reset Active Timeout Period
TRP
VCC
TA=+25°C
= VTH(MAX) TA= -40°C to +85°C
TMD
Vcc=6V
MR to Reset Propagation
Delay
MR Input Threshold
VIH
RESET Output Voltage
4.0
4.060
4.080
4.4
4.466
4.488
4.6
4.669
4.692
µS
20
140
230
100
560
1030
VIL
0.25VCC
10
VOH
VCC=VTH+0.1V, ISOURCE=1mA
VOL
VCC=VTH - 0.1V, ISINK=1mA
VOH
VCC=VTH+0.1V, ISOURCE=1mA
VOL
VCC=VTH - 0.1V, ISINK=1mA
20
mS
µS
0.5
0.7VCC
MR Pull-Up Resistance
RESET Output Voltage
3.162
30
0.8VCC
0.2Vcc
0.8VCC
0.2Vcc
V
KΩ
V
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 AIC811; RESET output is for AIC812.
6
AIC811/AIC812
TYPICAL PERFORMANCE CHARACTERISTICS
120
1.4
VTH=2.3V
Supply Current (µA)
1.3
1.2
1.1
VTH=3.1V
1.0
VTH=4.6V
0.9
0.8
0.7
0.6
Power-Down Reset Delay (µS)
1.5
110
VTH=2.3V
VOD=VTH-VCC
100
90
80
70
VOD=50mV
60
50
VOD=100mV
40
30
VOD=200mV
20
10
0
0.5
-20
-40
0
40
20
60
80
100
-60
Temperature (°C)
-40
-20
0
20
40
60
80
100
Temperature (°C)
Fig 2 Power-Down Reset Delay vs. Temperature
Fig 1 Supply Current vs. Temperature
VTH=3.1V
VOD=VTH-VCC
220
200
Power-Down Reset Delay (µS)
Power-Down Reset Delay (µS)
240
180
160
140
VOD=50mV
120
100
80
60
VOD=100mV
40
VOD=200mV
20
0
VTH=4.6V
VOD=50mV
400
VOD=VTH-VCC
300
200
VOD=100mV
100
VOD=200mV
0
-60
-40
0
-20
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Fig 3 Power-Down Reset Delay vs. Temperature
Fig 4 Power-Down Reset Delay vs. Temperature
Power-Up Reset Timeout (mS)
Normalized Reset Threshold (V)
600
1.015
VTH=4.6V
1.010
1.005
1.000
VTH=3.1V
0.995
VTH=2.3V
0.990
0.985
500
400
VTH=3.1V
VTH=4.6V
300
200
VTH=2.3V
100
0
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
Temperature (°C)
Temperature (°C)
Fig 5 Normalized Reset Threshold vs. Temperature
Fig 6 Power-Up Reset Timeout vs. Temperature
100
7
AIC811/AIC812
BLOCK DIAGRAM
VCC
RESET
(RESET)
R1
Bandgap
-
Reset Generator
+
RPULL_UP
R2
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 20kΩ 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
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.
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.
8
AIC811/AIC812
MANUAL RESET INPUT
Many μ 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 Ω
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 0.1µF 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 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
theμP reset I/O. Buffer the reset output to other
NEGATIVE-GOING VCC TRANSIENTS
In addition to issuing a reset to the μP during
system components.
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 μP WITH BIDIRECTIONAL
RESET PINS
μPs with bidirectional reset pins can contend with
AIC811/812 reset outputs. If AIC811 RESET
output is asserted high and the μP 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
9
PHYSICAL DIMENSIONS (unit: mm)
SOT-143
D
e
e1
A
E
E1
S
Y
M
B
O
L
A
SEE VIEW B
WITH PLATING
c
A
A2
b/b2
SOT-143
MILLIMETERS
MIN.
MAX.
A
0.80
1.22
A1
0.05
0.15
A2
0.75
1.07
b
0.30
0.50
b2
0.76
0.89
c
0.08
0.20
D
2.80
3.04
E
2.10
2.64
E1
1.20
1.40
e
1.92 BSC
e1
0.20 BSC
L
L1
BASE METAL
θ
0.54 REF
0°
8°
A1
SECTION A-A
0.60
0.40
GAUGE PLANE
SEATING PLANE
0.25
θ
L
L1
VIEW B
Note: 1. Refer to JEDEC TO-253AA.
2. Dimension "D" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side.
3. Dimension "E1" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
10
SOT-23-5
D
A
e
e1
SEE VIEW B
WITH PLATING
c
A
A2
b
SOT-23-5
MILLIMETERS
MIN.
MAX.
A
0.95
1.45
A1
0.05
0.15
A2
0.90
1.30
b
0.30
0.50
c
0.08
0.22
D
2.80
3.00
E
2.60
3.00
E1
1.50
1.70
e
0.95 BSC
e1
1.90 BSC
L
SECTION A-A
q
0.60 REF
0°
8°
0.25
A1
BASE METAL
0.60
0.30
L1
GAUGE PLANE
SEATING PLANE
L
L1
θ
A
E
E1
S
Y
M
B
O
L
VIEW B
Note : 1. Refer to JEDEC MO-178AA.
2. Dimension "D" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 10 mil per side.
3. Dimension "E1" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
11
SOT-23-6
D
A
A
A
E
E1
S
Y
M
B
O
L
e
e1
SEE VIEW B
WITH PLATING
c
A
A2
b
MIN.
MAX.
0.95
1.45
A1
0.05
0.15
A2
0.90
1.30
b
0.30
0.50
c
0.08
0.22
D
2.80
3.00
E
2.60
3.00
E1
1.50
1.70
e
0.95 BSC
e1
1.90 BSC
L
SECTION A-A
A1
BASE METAL
SOT-23-6
MILLIMETERS
0.42 REF
0°
8°
0.25
θ
0.60
0.30
L1
GAUGE PLANE
SEATING PLANE
L1
θ
L
VIEW B
Note : 1. Refer to JEDEC MO-178AB.
2. Dimension "D" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 10 mil per side.
3. Dimension "E1" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
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.
12
