AIC AIC812-29CVTR Reset circuits with manual reset input Datasheet

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, 2.9V,
external components. AIC811/AIC812 also offer a
3.1V, 4.0V, 4.4V, and 4.6V
manual reset input.
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
APPLICATIONS
signal lasts for a minimum period of 140ms whenever
Notebook Computers
VCC supply voltage falls below preset threshold. Both
Digital Still Cameras
AIC811 and AIC812 were designed with a reset
PDAs
comparator to help identify invalid signals, which last
Critical Microprocessor Monitoring
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 AIC811/AIC812 ideal
for portable equipment. The devices are available in
SOT-23-5 package.
TYPICAL APPLICATION CIRCUIT
VCC
VCC
VCC
AIC811
(AIC812)
RESET
(RESET)
MR
µP
RESET
INPUT
GND
GND
Pushbutton
Switch
Analog Integrations Corporation
Si-Soft Research Center
DS-811P-03 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
AIC811/AIC812
ORDERING INFORMATION
AIC811-XXXXXX
AIC812-XXXXXX
PIN CONFIGURATION
SOT-23-5
TOP VIEW
1: GND
2: NC
3: RESET (RESET)
4: MR
5: VCC
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
V: SOT-23-5
5
1
4
2
3
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
SOT-23-5 Marking
Part No.
Marking
Part No.
Marking
AIC811-23CV
BQ23
AIC812-23CV
BR23
AIC811-26CV
BQ26
AIC812-26CV
BR26
AIC811-29CV
BQ29
AIC812-29CV
BR29
AIC811-31CV
BQ31
AIC812-31CV
BR31
AIC811-40CV
BQ40
AIC812-40CV
BR40
AIC811-44CV
BQ44
AIC812-44CV
BR44
AIC811-46CV
BQ46
AIC812-46CV
BR46
2
AIC811/AIC812
Part No.
Marking
Part No.
Marking
AIC811-23PV
BQ23P
AIC812-23PV
BR23P
AIC811-26PV
BQ26P
AIC812-26PV
BR26P
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
ABSOLUTE MAXIMUM RATINGS
VCC
-0.3V ~6.5V
RESET, RESET
-0.3V ~ (VCC+0.3V)
Input Current (VCC, MR )
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
1
2
3
GND
VCC
NC
MR
5
4 Iin
Vin
RESET
AIC811 Pushbuttom
Switch
3
AIC811/AIC812
ELECTRICAL CHARACTERISTICS
(Typical values are at TA=25°C, unless otherwise specified) (Note 1)
PARAMETER
SYMBOL
Operating Voltage Range
VCC
Supply Current
ICC
TEST CONDITIONS
VCC = VTH +0.1V
AIC811-26
AIC811-29
VTH
AIC811-31
AIC811-40
AIC811-44
AIC811-46
TA=+25°C
2.254
TA=+25°C
2.561
TA= -40°C to +85°C
2.548
TA=+25°C
2.857
TA= -40°C to +85°C
2.842
TA=+25°C
3.054
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
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
Delay
MR Input Threshold
VIH
RESET Output Voltage
MAX.
UNIT
6
V
1
3
µA
2.3
2.335
2.346
2.6
2.639
2.652
2.9
2.944
2.958
3.1
3.147
3.162
4.0
4.060
4.4
4.466
4.488
4.6
4.669
4.692
µS
20
140
230
100
560
1030
0.25VCC
VIL
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
10
V
4.080
0.7VCC
MR Pull-Up Resistance
RESET Output Voltage
2.265
TA= -40°C to +85°C
VCC to Reset Delay
MR to Reset Propagation
TYP.
0.9
AIC811-23
Reset Threshold
MIN.
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.
4
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
-60
-40
0
-20
20
40
60
80
VTH=4.6V
VOD=50mV
400
VOD=VTH-VCC
300
200
VOD=100mV
100
VOD=200mV
0
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
-40
-20
0
20
40
60
80
100
500
400
VTH=3.1V
VTH=4.6V
300
200
VTH=2.3V
100
0
-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
5
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.
6
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
RESET must be valid down to 0V, adding a
NEGATIVE-GOING VCC TRANSIENTS
In addition to issuing a reset to the μP during
pull-down resistor to RESET causes any leakage
power-up, power-down, and brownout conditions,
AIC811 series are relatively resistant to
short-duration negative-going VCC transient.
INTERFACING TO μP WITH BIDIRECTIONAL
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
currents to flow to ground, holding RESET low.
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
theμP reset I/O. Buffer the reset output to other
system components.
7
AIC811/AIC812
PHYSICAL DIMENSIONS (unit: mm)
SOT-23-5
D
A
A
E
E1
S
Y
M
B
O
L
e
e1
SEE VIEW B
WITH PLATING
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
c
A
A2
b
SOT-25
SECTION A-A
A1
BASE METAL
L
0.30
L1
0°
8°
0.25
θ
0.60
0.60 REF
GAUGE PLANE
SEATING PLANE
L1
θ
L
VIEW B
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.
8
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