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CAT853, CAT863 CAT859, CAT869
3-Pin Microprocessor Power Supply Supervisors
FEATURES

DESCRIPTION
The CAT853, CAT863, CAT859, and CAT869 are supervisory circuits that monitor power supplies in digital systems. These devices generate a reset signal, which is asserted while the power supply voltage is below a preset threshold level and for at least 140 ms after the power supply level has risen above that level. Industry standard threshold levels are offered to support +3.3V or 5.0V systems. The CAT859 and CAT869 feature a RESET push-pull output (active low) for the two pinout options. The CAT853 and CAT863 feature an open drain RESET output (active low). Both require a pull-up resistor on the RESET output. Fast transients on the power supply are ignored and the output is guaranteed to be in the correct state at Vcc levels as low as 1.0V.
Precision monitoring of +3.3V (-5%, -10%), 5V (-10% Power Supplies) Active low reset output Reset valid down to VCC = 1.0V 6A power supply current Power supply transient immunity Industrial temperature range: -40C to +85C RoHS-compliant SOT-23 package
APPLICATIONS

Computers Servers Laptops Cable modems Wireless communications Embedded control systems White goods Power meters Intelligent instruments PDAs and handheld equipment
For Ordering Information details, see page 8.
PIN CONFIGURATION
3-Lead SOT23
RESET 1 RESET
THRESHOLD SUFFIX SELECTOR
3-Lead SOT23
1
Nominal Threshold Voltage 3.08V
GND
Threshold Suffix Designation T S M
CAT853 CAT859
GND 2
3
VCC VCC 2
CAT863 CAT869
3
2.93V 4.38V
PIN DESCRIPTIONS
Name Description RESET Active low reset. RESET is asserted if VCC falls below the reset threshold and remains low for at least 140ms after VCC rises above the reset threshold. GND VCC Ground Power supply voltage that is monitored.
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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Doc. No. 3026, Rev. B
CAT853, CAT863, CAT859, CAT869
ABSOLUTE MAXIMUM RATINGS(1) Any pin with respect to ground Input Current, VCC Output Current, RESET Rate of Rise, VCC Continuous Power Dissipation Derate 4mW/C above 70C (SOT23) Operating Temperature Range Storage Temperature Range Lead Soldering Temperature (10 sec)
Note: (1) Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
-0.3V to +6.0V 20mA 20mA 100V/s 320 mW -40C to +85C -65C to +105C 300C
ELECTRICAL CHARACTERISTICS VCC = Full range, TA = -40C to +85C unless otherwise noted. Typical values at TA = +25C and VCC = 3.3V for the T/S versions, VCC = 5V for the M version. Parameter VCC Range Supply Current Reset Threshold Voltage ICC VTH Symbol Conditions TA = 0C to +70C TA = -40C to +85C TA = -40C to +85C T Threshold S Threshold M Threshold Reset Threshold Tempco VCC to Reset Delay Reset Active Timeout Period RESET Output Voltage Low RESET Output Voltage High VOL VOH VCC = VTH to (VTH - 100 mV) TA = -40C to +85C VCC = VTH min, ISINK = 1.2mA VCC > 1.0V, ISINK = 50A VCC = VTH max, ISOURCE = -500A (for CAT859/869 only) 0.8 VCC 140 VCC < 3.6V, S/T TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 3.04 3.00 2.89 2.85 4.31 4.25 30 4.38 2.93 Min 1.0 1.2 6 3.08 Typ(1) Max 5.5 5.5 15 3.11 3.15 2.96 3.00 4.45 4.50 ppm/C A V Units V
20 240 460 0.4 0.3
s ms V V
Note: (1) Production testing done at TA = +25C; limits over temperature guaranteed by design only.
Doc. No. 3026, Rev. B
2
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
TYPICAL OPERATING CHARACTERISTICS VCC = Full range, TA = -40C to +85C unless otherwise noted. Typical values at TA = +25C, VCC=3.3V for T/S versions, and VCC = 5V for the M version.
POWER-UP RESET TIMEOUT VS. TEMPERATURE
POWER-UP RESET TIMEOUT (mS)
260
SUPPLY CURRENT VS. TEMPERATURE (NO LOAD)
12
SUPPLY CURRENT (A)
240 220 200
VCC=5V
10 8 6 4 2 0
VCC=5.5V
VCC=3.6V
VCC=2.5V
180 160 -50 0 50 100 150
-50
0
50
100
150
TEMPERATURE (C)
TEMPERATURE (C)
POWER-DOWN RESET DELAY (S)
POWER-DOWN RESET DELAY VS. TEMPERATURE
NORMALIZED THRESHOLD
14 12 10 8 6 4 2 0 -50 0 50 100 150 1.0002 1 0.9998 0.9996 0.9994 0.9992 0.999 0.9988
NORMALIZED RESET THRESHOLD VS. TEMPERATURE
0
20
40
60
80
100
120
TEMPERATURE (C)
TEMPERATURE (C)
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
3
Doc No. 3026, Rev. B
CAT853, CAT863, CAT859, CAT869 DETAILED DESCRIPTIONS
RESET TIMING The reset signal is asserted low for the CAT853, CAT863, CAT859, and CAT869 when the power supply voltage falls below the threshold trip voltage and remains asserted for at least 140ms after the power supply voltage has risen above the threshold.
Power 5V Supply Voltage 0V Threshold Voltage Reset Timeout Period 140ms minimum
RESET
5V 0V
Figure 1. Reset Timing Diagram
VCC TRANSIENT RESPONSE The CAT853, CAT863, CAT859, and CAT869 protect Ps against brownout failure. Short duration transients of 4sec or less and 100mV amplitude typically do not cause a false RESET. Figure 2 shows the maximum pulse duration of negativegoing VCC transients that do not cause a reset condition. As the amplitude of the transient goes further below the threshold (increasing VTH - VCC), the maximum pulse duration decreases. In this test, the VCC starts from an initial voltage of 0.5V above the threshold and drops below it by the amplitude of the overdrive voltage (VTH - VCC).
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
Doc. No. 3026, Rev. B
4
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869
VALID RESET WITH VCC UNDER 1.0V To ensure that the CAT859 and CAT869 RESET pin is in a known state when VCC is under 1.0V, a >10k pull-down resistor between RESET pin and GND is recommended.
Power Supply VCC
CAT8x9
RESET GND
Figure 3. RESET Valid with VCC Under 1.0V
BI-DIRECTIONAL RESET PIN INTERFACING The CAT859 and CAT869 can interface with P/C bi-directional reset pins by connecting a 4.7k resistor in series with the CAT859 and CAT869 reset output and the P/C bi-directional reset pin.
BUF Power Supply VCC VCC Buffered RESET
CAT8x9
RESET GND RESET INPUT
Bi-directional I/O Pin
P
(For example: 68HC11)
GND
Figure 4. Bi-directional Reset Pin Interfacing
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
5
Doc No. 3026, Rev. B
CAT853, CAT863, CAT859, CAT869
CAT853 AND CAT863 OPEN-DRAIN RESET APPLICATION The CAT853 and CAT863 features an open-drain RESET output and therefore need a pull-up resistor on the output for proper operation, as shown on Figure 5. An advantage of the open-drain output includes the ability to "wire AND" several outputs together to form an inexpensive logic circuit. It is also possible to have the pull-up resistor connected to a different supply which can be higher than the CAT8x3 VCC pin. The value of the pull-up resistor is not critical in most applications, typical values being between 5k and 10k.
Power Supply VCC 5k VCC
CAT8x3
RESET GND RESET INPUT
P
GND
Figure 5. Typical CAT8x3 Open-Drain Circuit Configuration
Doc. No. 3026, Rev. B
6
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT853, CAT863, CAT859, CAT869 PACKAGE INFORMATION
Plastic SOT-23 (3-Pin)
B
E
H
e
e1
D
E c
A
A1 L1 L
Inches Min A A1 B c D E e e1 H L L1 0.0350 0.0005 0.0146 0.0033 0.1102 0.0472 0.0350 0.0701 0.0827 0 0.0083 0.0160 Max 0.0441 0.0039 0.0197 0.0071 0.1197 0.0551 0.0406 0.0807 0.1039 8 0.0161 0.0270
Millimeters Min 0.89 0.013 0.37 0.085 2.80 1.20 0.89 1.78 2.10 0 0.275 0.275 Max 1.12 0.10 0.50 0.18 3.04 1.40 1.03 2.05 2.64 8 0.41 0.685 For current Tape and Reel information, download the PDF file from: www.catsemi.com/documents/tapeandreel.pdf
Plastic SOT-23 (3-Pin)
Notes: (1) This part is compliant with JEDEC specification TO-236 (2) Die is face up for mold and trim/form (3) Dimensions are exclusive of mold flash and metal burr
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
7
Doc No. 3026, Rev. B
CAT853, CAT863, CAT859, CAT869 EXAMPLE OF ORDERING INFORMATION (1) (2) (3)
Prefix CAT Device # 859 Suffix S TBI - G T10
Company ID Device Type 853: Open Drain / Active Low Output 863: Open Drain / Active Low Output 859: Push-Pull / Active Low Output 869: Push-Pull / Active Low Output
Threshold Level T: 3.08V S: 2.93V M: 4.38V
Lead Finish G: NiPdAu (PPF) T: Tape & Reel 3: 3000/Reel 10: 10000/Reel
Package Type TBI: SOT-23 Green(1)
TOP MARKING
Part and Threshold CAT859T CAT859S CAT859M CAT869T CAT869S CAT869M RTYM RSYM SOT-23 RoHS NiPdAu Finish(4) (5) Part and Threshold CAT853T CAT853S CAT853M CAT863T CAT863S CAT863M RVYM RUYM SOT-23 RoHS NiPdAu Finish(4) (5)
ORDERING PART NUMBER
CAT859TTBI-G CAT859STBI-G CAT859MTBI-G(6) CAT869TTBI-G CAT869STBI-G CAT869MTBI-G(6) CAT853TTBI-G CAT853STBI-G(6) CAT853MTBI-G CAT863TTBI-G CAT863STBI-G(6) CAT863MTBI-G
Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The device used in the example above is a CAT859STBI-GT10 (Push-Pull / Active Low Output, trip level of 2.85V to 3.00V NiPdAu, Tape and Reel). (3) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. (4) The "YM" in the SOT-23 package marking indicates the Year and Month of production. (5) All NiPdAu devices will be marked to indicate product type. Threshold and full part numbers will be provided on box and reel labels as well as all Shipping documents. (6) For special threshold and package categories, contact factory.
Doc. No. 3026, Rev. B
8
(c) 2007 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
REVISION HISTORY
Date 10/11/2006 05/04/2007 Rev. A B Reason Initial Issue CAT859, CAT869 Added CAT853, CAT863 Update Example of Ordering Information Update Top Marking Update Ordering Part Number
Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Beyond MemoryTM, DPP TM, EZDimTM, LDDTM, MiniPotTM and Quad ModeTM Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com
Document No: 3026 Revision: B Issue date: 05/04/07

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