AIC AIC809N26CUTR 3-pin microprocessor reset circuit Datasheet

AIC809/AIC810
3-Pin Microprocessor Reset Circuits
FEATURES
DESCRIPTION
Ultra Low Supply Current 1µA(typ.)
AIC809/AIC810 are low-power microprocessor (µP)
Guaranteed Reset Valid to Vcc=0.9V
supervisory circuits used to monitor power supplies in
Available in Three Output Type: Open-Drain
µP and digital systems. They provide applications with
Active Low (AIC809N), Push-Pull Active Low
benefits of circuit reliability and low cost by eliminating
(AIC809), Push-Pull Active High (AIC810)
external components.
140ms Min. Power-On Reset Pulse Width
Internally Fixed Threshold 2.3V, 2.6V, 2.9V,
3.1V, 4.0V, 4.4V, 4.6V
These devices perform as valid singles in applications
Tight Voltage Threshold Tolerance: 1.5%
with Vcc ranging from 6.0V down to 0.9V. The reset
Tiny Package in SOT-23
signal lasts for a minimum period of 140ms whenever
VCC supply voltage falls below preset threshold. Both
APPLICATIONS
AIC809 and AIC810 were designed with a reset
Notebook Computers
comparator to help identify invalid signals, which last
Digital Still Cameras
less than 140ms. The only difference between them is
PDAs
that they have an active-low RESET output and
Critical Microprocessor Monitoring
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
VCC
VCC
VCC
AIC809
(AIC810)
RESET
(RESET)
µP
RESET
INPUT
GND
GND
Push-Pull Output
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
AIC809/AIC810
ORDERING INFORMATION
AIC809X-XXXXXX
AIC810 -XXXXXX
PIN CONFIGURATION
SOT-23
TOP VIEW
1: GND
2: RESET (RESET)
3: VCC
PACKING TYPE
TR: TAPE & REEL
BG: BAG
3
1
2
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
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
A IC 8 0 9
V IN
I IN
VCC
RESET
GND
3
AIC809/AIC810
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
AIC809-26
AIC809-29
VTH
AIC809-31
AIC809-40
AIC809-44
AIC809-46
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 = VTH (MAX)
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
RESET Output Voltage
2.265
TA= -40°C to +85°C
VCC to Reset Delay
RESET Output Voltage
TYP.
MAX.
UNIT
6
V
1
3
µA
2.3
2.335
0.9
AIC809-23
Reset Threshold
MIN.
2.346
2.6
2.639
2.652
2.9
2.944
2.958
3.1
3.147
3.162
4.0
4.060
4.080
4.4
4.466
4.488
4.6
4.669
4.692
µS
20
TA=+25°C
140
TA= -40°C to +85°C
100
V
230
560
1030
0.8VCC
0.2Vcc
0.8VCC
0.2Vcc
mS
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 AIC809; RESET output is for AIC810.
4
AIC809/AIC810
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
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
6
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
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 μP 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 μ P
supervisor’s RESET
output
directly
to
the
microcontroller’s RESET pin with a single pull-up
resistor allows either device to assert reset.
7
AIC809/AIC810
PHYSICAL DIMENSIONS (unit: mm)
SOT-23
D
S
Y
M
B
O
L
A
A
E
E1
e
e1
SEE VIEW B
WITH PLATING
c
A
A2
b
BASE METAL
SECTION A-A
SOT-23
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
0.95 BSC
e1
1.90 BSC
L
0.60 REF
0°
8°
0.25
θ
0.60
0.30
L1
A1
1.70
e
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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