SS809N-40GU [SSC]
3-Pin Microprocessor Reset Circuits; 3引脚微处理器复位电路型号: | SS809N-40GU |
厂家: | SILICON STANDARD CORP. |
描述: | 3-Pin Microprocessor Reset Circuits |
文件: | 总8页 (文件大小:307K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
SS809/810G
3-Pin Microprocessor Reset Circuits
FEATURES
DESCRIPTION
Ultra-low supply current 1mA (typ.)
Guaranteed reset valid to Vcc=0.9V
Available in three output types:
Open-drain active low (SS809N-xxGx)
Push-pull active low (SS809-xxGx)
Push-pull active high (SS810-xxGx)
Power-on reset pulse width min. 140ms
Internally fixed threshold 2.3V, 2.6V, 2.9V, 3.1V,
4.0V, 4.4V, 4.6V
The SS809G and SS810G are low-power microprocessor
(µP) supervisory circuits used to monitor power supplies
in µP and digital systems. They improve circuit reliability
and reduce cost by eliminating external components.
These devices provide valid signals in applications
with Vcc ranging from 6.0V down to 0.9V. The reset
signal lasts for a minimum period of 140mswhenever the
VCC supply voltage falls below a preset threshold. Both
the SS809G and SS810G were designed with a reset
comparator to help identify invalid signals lasting less
than 140ms. The only difference between the two
devices is that one has an active-low RESET output
and the other an active-high RESET output.
Tight voltage threshold tolerance: 1.5%
Packaged in RoHS-compliant SOT-23-3
APPLICATIONS
l Notebook Computers
l Digital Still Cameras
l PDAs
l Critical Microprocessor Monitoring
Low supply current (1mA) makes the SS809G and SS810G
ideal for portable equipment. The devices are available in
a SOT-23-3 package.
TYPICAL APPLICATION CIRCUIT
V
CC
VCC
VCC
SS809G
(SS810G)
mP
RESET
INPUT
RESET
(RESET)
GND
GND
Push-Pull Output
9/20/2006 Rev.3.01
www.SiliconStandard.com
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SS809/810G
ORDERING INFORMATION
PIN CONFIGURATION
SS809X-XXGU XX
SS810 -XXGU XX
SOT-23-3
Packing type
TR: Tape and reel
TOP VIEW
1: GND
3
2: RESET (RESET)
3: VCC
1
2
Package type
GU: RoHS-compliant Pb-free SOT-23-3
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
Example: SS809-31GU TR
à 3.1V, push-pull version in RoHS-compliant SOT-23-3 , shipped in tape and reel
SOT-23 Part Marking
Part No.
Marking
Part No.
Marking
Part No.
Marking
SS809-23GU
SS809-26GU
SS809-29GU
SS809-31GU
SS809-40GU
SS809-44GU
SS809-46GU
RA23P
RA26P
SS809N-23GU
SS809N-26GU
SS809N-29GU
SS809N-31GU
SS809N-40GU
SS809N-44GU
SS809N-46GU
RB23P
RB26P
SS810-23GU
SS810-26GU
SS810-29GU
SS810-31GU
SS810-40GU
SS810-44GU
SS810-46GU
RD23P
RD26P
RA29P
RA31P
RA40P
RA44P
RA46P
RB29P
RB31P
RB40P
RB44P
RB46P
RD29P
RD31P
RD40P
RD44P
RD46P
9/20/2006 Rev.3.01
www.SiliconStandard.com
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SS809/810G
ABSOLUTE MAXIMUM RATINGS
VCC
-0.3V ~6.5V
-0.3V ~ (VCC+0.3V)
20mA
RESET
RESET,
Input Current (VCC
)
Output Current (RESET or RESET )
Continuous Power Dissipation (TA = +70°C)
Operating Junction Temperature Range
Storage Temperature Range
20mA
320mW
-40°C ~ 85°C
- 65°C ~ 125°C
260°C
Lead Temperature (Soldering) 10 sec
Note1: Any stress beyond the Absolute Maximum Ratings above may cause permanent damage to the device.
TEST CIRCUIT
3
2
Vin
VCC
RESET
GND
1
Iin
SS809G
9/20/2006 Rev.3.01
www.SiliconStandard.com
3 of 8
SS809/810G
ELECTRICAL CHARACTERISTICS
(Typical values are at TA=25°C, unless otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN.
TYP. MAX. UNIT
SYMBOL
VCC
Operating Voltage Range
Supply Current
0.9
6
V
ICC
VCC = VTH +0.1V
1
3
mA
TA=+25°C
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
2.335
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
SS809-23
SS809-26
SS809-29
TA= -40°C to +85°C
TA=+25°C
2.6
2.9
3.1
4.0
4.4
4.6
TA= -40°C to +85°C
TA=+25°C
TA= -40°C to +85°C
TA=+25°C
Reset Threshold
VTH SS809-31
SS809-40
V
TA= -40°C to +85°C
TA=+25°C
TA= -40°C to +85°C
TA=+25°C
SS809-44
TA= -40°C to +85°C
TA=+25°C
SS809-46
TA=-40°C to +85°C
VCC to Reset Delay
TRD
TRP
VCC=VTH to (VTH -0.1V), VTH=3.1V
20
mS
TA=+25°C
VCC = VTH (MAX)
140
100
230
560
Reset Active Timeout Period
mS
TA= -40°C to +85°C
1030
VOH VCC=VTH+0.1V, ISOURCE=1mA
VOL VCC=VTH - 0.1V, ISINK=1mA
0.8VCC
RESET
Output Voltage
V
V
0.2Vcc
0.2Vcc
VOH
VOL
0.8VCC
VCC=VTH-0.1V, ISOURCE=1mA
VCC=VTH+0.1V, ISINK=1mA
RESET Output Voltage
RESET
Note2:
output is for the SS809G; RESET output is for the SS810G.
Note3: Specifications for operating temperature ranges from -40°C to 85°C are guaranteed by Statistical Quality
Controls (SQC), with no production testing.
9/20/2006 Rev.3.01
www.SiliconStandard.com
4 of 8
SS809/810G
TYPICAL PERFORMANCE CHARACTERISTICS
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
120
110
100
90
80
70
60
50
40
30
20
10
0
VTH=2.3V
VTH=2.3V
VOD=VTH-VCC
VTH=3.1V
VTH=4.6V
VOD=50mV
VOD=100mV
VOD=200mV
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
°
Temperature ( C)
°
Temperature ( C)
Fig 1 Supply Current vs. Temperature
Fig 2 Power-Down Reset Delay vs. Temperature
240
220
200
180
160
140
120
100
80
VTH=3.1V
VTH=4.6V
VOD=50mV
400
300
200
100
0
VOD=VTH-VCC
VOD=VTH-VCC
VOD=50mV
VOD=100mV
VOD=200mV
60
VOD=100mV
VOD=200mV
40
20
0
-60
-40
-20
0
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
600
500
400
300
200
100
0
1.015
1.010
1.005
1.000
0.995
0.990
0.985
VTH=4.6V
VTH=3.1V
VTH=4.6V
VTH=3.1V
VTH=2.3V
VTH=2.3V
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
°
°
Temperature ( C)
Temperature ( C)
Fig 5 Normalized Reset Threshold vs. Temperature
Fig 6 Power-Up Reset Timeout vs. Temperature
9/20/2006 Rev.3.01
www.SiliconStandard.com
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SS809/810G
BLOCK DIAGRAM
VCC
R1
R2
Bandgap
-
RESET
+
Reset Generator
NMOS
GND
N-ch Open-Drain Type
VCC
R1
R2
Bandgap
-
Reset Generator
RESET
(RESET)
+
GND
Push-Pull Type
PIN DESCRIPTIONS
GND Pin
:
Ground.
RESET Pin (SS809G) : Active low output pin. RESET Output remains low while Vcc is below the reset
RESET Pin (SS810G)
:
:
Active high output pin. RESET output remains high while Vcc is below the reset threshold.
Supply voltage.
Vcc Pin
9/20/2006 Rev.3.01
www.SiliconStandard.com
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SS809/810G
DETAILED DESCRIPTIONS OF TECHNICAL TERMS
threshold, and RESET remains low for the reset
RESET OUTPUT
timeout period.
The 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.
BENEFITS OF HIGHLY ACCURATE RESET
THRESHOLD
The SS809G and SS810G with specified voltage as 5V±
RESET is guaranteed to be a logic low for
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 the power drops below the minimum
specified operating voltage range of the system ICs.
VTH>V >0.9V. Once V
exceeds the reset
CC
CC
threshold, an internal timer keeps RESET low for
the reset timeout period; after this interval, RESET
goes high.
If a brownout condition occurs (V drops below the
CC
The pre-trimmed thresholds reduce the range over
which an undesirable reset may occur.
RESET
reset threshold),
goes low. Any time V
CC
goes below the reset threshold, the internal timer
RESET
resets to zero, and
goes low. The internal
timer is activated after V
returns above the reset
CC
APPLICATION INFORMATION
NEGATIVE-GOING VCC TRANSIENTS
of 0.9V. However in applications where RESET
In addition to issuing a reset to the µP during
must be valid down to 0V, adding a pull-down resistor
RESET
to
causes any leakage currents to flow to
RESET
power-up, power-down, and brownout conditions, the
SS809G series are relatively resistant to short-duration
negative-going VCC transients.
ground, holding
low.
INTERFACING TO A MICROPROCESSOR WITH
BIDIRECTIONAL RESET PINS
ENSURING A VALID RESET OUTPUT DOWN TO
VCC=0
RESET
The
output on the SS809N is open drain,
and this device interfaces easily with µPs that have
bidirectional reset pins. Connecting the mP
When VCC falls below 0.9V, the SS809G RESET
output no longer sinks current; it becomes an open
circuit. In this case, high-impedance CMOS logic
RESET
supervisor’s
microcontroller’s
output directly to the
pin with a single pull-up
RESET
inputs connected to
can drift to
RESET
undetermined voltages. Therefore, the SS809G/810G
are perfect for most CMOS applications down to VCC
resistor allows either device to assert reset.
9/20/2006 Rev.3.01
www.SiliconStandard.com
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SS809/810G
PHYSICAL DIMENSIONS
SOT-23-3 (unit: mm)
C
SYMBOL
MIN
1.00
—
MAX
D
A
A1
A2
b
1.30
L
0.10
0.70
0.35
0.10
2.70
1.40
0.90
E
H
0.50
C
0.25
q
1
e
D
3.10
E
1.80
A
e
1.90 (TYP)
A2
H
2.60
0.37
1°
3.00
—
A1
L
b
q1
9°
Information furnished by Silicon Standard Corporation is believed to be accurate and reliable. However, Silicon Standard Corporation makes no
guarantee or warranty, express or implied, as to the reliability, accuracy, timeliness or completeness of such information and assumes no
responsibility for its use, or for infringement of any patent or other intellectual property rights of third parties that may result from its
use. Silicon Standard reserves the right to make changes as it deems necessary to any products described herein for any reason, including
without limitation enhancement in reliability, functionality or design. No license is granted, whether expressly or by implication, in relation to
the use of any products described herein or to the use of any information provided herein, under any patent or other intellectual property rights of
Silicon Standard Corporation or any third parties.
9/20/2006 Rev.3.01
www.SiliconStandard.com
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