SSR809N [SMC]
3-Pin Microprocessor Reset Circuits;
| 型号： | SSR809N |
| 厂家： | 
Sangdest Microelectronic (Nanjing) Co., Ltd |
| 描述： | 3-Pin Microprocessor Reset Circuits |
| 文件： | 总10页 (文件大小：282K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Description:
SSR809P/SSR810P 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 signals 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 SSR809P and SSR810P 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 SSR809P/SSR810P ideal for portable equipment. The devices are
available in SOT-23 package.
Features:
•
Ultra Low Supply Current 1μA(typ.)
•
•
Guaranteed Reset Valid to Vcc=0.9V
Available in Three Output Type: Open-Drain Active Low (SSR809N), Push-Pull Active Low
(SSR809P), Push-Pull Active High (SSR810P)
140ms Min. Power-On Reset Pulse Width
Internally Fixed Threshold 2.3V, 2.6V, 2.9V, 3.1V, 4.0V, 4.2V, 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
Typical application circuit:
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Ordering Information:
PIN CONFIGURATION
SSR809X -XXXXX
SSR810X -XXXXX
SOT-23
TOP VIEW
PACKING TYPE
TB: TUBE
1: GND
————————
TR: TAPING & REEL
2: R E S E T (RESET)
3: VCC
PACKAGING TYPE
F: SOT-23
SOT-23
TOP VIEW
RESET THRESHOLD
VOLTAGE
23: 2.3V
————————
1: R E S E T (RESET)
2: GND
3: VCC
26: 2.6V
29: 2.9V
31: 3.1V
40: 4.0V
42: 4.2V
44: 4.4V
46: 4.6V
OUTPUT TYPE
P: Push-Pull type
N: N-ch Open-Drain type
Marking Diagram:
Part No.
Marking
Part No.
Marking
Part No.
Marking
SSR809P-23FTR
SSR809P-26FTR
SSR809P-29FTR
SSR809P-31FTR
SSR809P-40FTR
RA23G
RA26G
RA29G
RA31G
RA40G
SSR810P-23FTR
SSR810P-26FTR
SSR810P-29FTR
SSR810P-31FTR
SSR810P-40FTR
RD23G
RD26G
RD29G
RD31G
RD40G
SSR809N-23FTR
SSR809N-26FTR
SSR809N-29FTR
SSR809N-31FTR
SSR809N-40FTR
RB23G
RB26G
RB29G
RB31G
RB40G
SSR809P-44FTR
SSR809P-46FTR
RA44G
RA46G
SSR810P-44FTR
SSR810P-46FTR
RD44G
RD46G
SSR809N-44FTR
SSR809N-46FTR
RB44G
RB46G
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
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 to 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
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Electrical Characteristics (Typical values are at TA=25°C, unless otherwise specified.) (Note 1)
Note: 1. 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).
————————
2. RESET output is for SSR809P; RESET output is for SSR810P.
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Typical Performance Characteristics
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Block Diagram
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Pin Descriptions
GND Pin
: Ground.
———————
———————
RESET Pin (SSR809P) : Active low output pin. RESET Output remains low while Vcc is below the reset
threshold.
RESET Pin (SSR810P) : 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 V >VCC>0.9V. Once VCC exceeds the reset threshold, an
TH
———————
———————
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), —R—E——S—E—T— 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
SSR809P/SSR810P 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.
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Application Information
NEGATIVE-GOING VCC TRANSIENTS
In addition to issuing a reset to the μP during power-up, power-down, and brownout conditions, SSR809P
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, SSR809P 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, SSR809P/SSR810P with CMOS is perfect for most applications of VCC below 0.9V. However in
———————
———————
applications where RESET must be valid down to 0V, adding 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 SSR809N 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-resistor allows either device to assert reset.
Application Circuit
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
Physical Dimensions
SOT-23 (unit: mm)
Note: 1. Refer to JEDEC MO-178.
2. Dimension D and E1 do not include mold flash, protrusions or gate burrs. Mold flash, protrusion or gate
burrs shall not exceed 10 mil per side.
3. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
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SSR809N
SSR809P/SSR810P
Technical Data
Data Sheet N1589 Rev. -
3-Pin Microprocessor Reset Circuits
DISCLAIMER:
1- The information given herein, including the specifications and dimensions, is subject to change without prior notice to improve product
characteristics. Before ordering, purchasers are advised to contact the SMC - Sangdest Microelectronics (Nanjing) Co., Ltd sales
department for the latest version of the datasheet(s).
2- In cases where extremely high reliability is required (such as use in nuclear power control, aerospace and aviation, traffic equipment,
medical equipment , and safety equipment) , safety should be ensured by using semiconductor devices that feature assured safety or by
means of users’ fail-safe precautions or other arrangement .
3- In no event shall SMC - Sangdest Microelectronics (Nanjing) Co., Ltd be liable for any damages that may result from an accident or
any other cause during operation of the user’s units according to the datasheet(s). SMC - Sangdest Microelectronics (Nanjing) Co., Ltd
assumes no responsibility for any intellectual property claims or any other problems that may result from applications of information,
products or circuits described in the datasheets.
4- In no event shall SMC - Sangdest Microelectronics (Nanjing) Co., Ltd be liable for any failure in a semiconductor device or any
secondary damage resulting from use at a value exceeding the absolute maximum rating.
5- No license is granted by the datasheet(s) under any patents or other rights of any third party or SMC - Sangdest Microelectronics
(Nanjing) Co., Ltd.
6- The datasheet(s) may not be reproduced or duplicated, in any form, in whole or part, without the expressed written permission of SMC
- Sangdest Microelectronics (Nanjing) Co., Ltd.
7- The products (technologies) described in the datasheet(s) are not to be provided to any party whose purpose in their application will
hinder maintenance of international peace and safety nor are they to be applied to that purpose by their direct purchasers or any third
party. When exporting these products (technologies), the necessary procedures are to be taken in accordance with related laws and
regulations..
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