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CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors FEATURES
s Precision monitoring of
H
GEN FR ALO
EE
LE
A D F R E ETM
s Direct replacements for the MAX811 and
+5.0 V (+/- 5%, +/- 10%, +/- 20%), +3.3 V (+/- 5%, +/ 10%), +3.0 V (+/- 10%) and +2.5 V (+/- 5%) power supplies
s Offered in two output configurations:
MAX812 in applications operating over the industrial temperature range
s Reset valid down to VCC = 1.0 V s6
A power supply current
- CAT811: Active LOW reset - CAT812: Active HIGH reset
s Manual reset input
s Power supply transient immunity s Compact 4-pin SOT143 package s Industrial temperature range: -40C to +85C
APPLICATIONS
s Computers s Servers s Laptops s Cable modems s Wireless communications s Embedded control systems s White goods s Power meters s Intelligent instruments s PDAs and handheld equipment
DESCRIPTION
The CAT811 and CAT812 are P supervisory circuits that monitor power supplies in digital systems. The CAT811 and CAT812 are direct replacements for the MAX811 and MAX812 in applications operating over the industrial temperature range; both have a manual reset input. 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. The underlying floating gate technology, AE2(TM) used by Catalyst Semiconductor, makes it possible to offer any custom reset threshold value. Seven industry standard threshold levels are offered to support +5.0 V, +3.3 V, +3.0 V and +2.5 V systems. The CAT811 features a RESET push-pull output (active LOW) and the CAT812 features a RESET push-pull output (active HIGH). 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 1.0 V. The CAT811/812 are fully specified over the industrial temperature range (-40C to 85C) and are available in a compact 4-pin SOT143 package.
THRESHOLD SUFFIX SELECTOR
Nominal Threshold Voltage 4.63V 4.38V 4.00V 3.08V 2.93V 2.63V 2.32V Threshold Suffix Designation L M J T S R Z
1
PIN CONFIGURATION
GND
1 CAT811 (CAT812)
4
VCC
RESET (RESET)
2
3
(c) 2004 by Catalyst Semiconductor, Inc., Patent Pending Characteristics subject to change without notice
Doc. No. 3005, Rev. P
CAT811, CAT812 ORDERING INFORMATION
Ordering Part Number CAT811_EUS-T CAT811_EUS-T10 CAT811_TBI-T CAT811_TBI-T10 CAT812_EUS-T CAT812_EUS-T10 CAT812_TBI-T CAT812_TBI-T10 RESET Polarity Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Push-Pull RESET Package 4-pin, SOT143 4-pin, SOT143 4-pin, SOT143 Green 4-pin, SOT143 Green 4-pin, SOT143 4-pin, SOT143 4-pin, SOT143 Green 4-pin, SOT143 Green Parts per Reel 3k 10k 3k 10k 3k 10k 3k 10k
Insert threshold suffix (L, M, J, T, S, R or Z) into the blank position. Example: CAT811LTBI-T for 4.63 V, and lead-free SOT143 package.
TOP MARKING
SOT143 CAT811L CAT811M CAT811J CAT811T CAT811S CAT811R CAT811Z CAT812L CAT812M CAT812J CAT812T CAT812S CAT812R CAT812Z Where YM stands for Year and Month. AMYM ANYM AZYM APYM AQYM ARYM AYYM ASYM ATYM AUYM AVYM AWYM AXYM CIYM SOT143 Green DHYM DJYM CKYM DLYM DMYM DNYM CPYM DRYM DTYM DUYM DVYM DWYM DXYM CYYM
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Patent Pending
CAT811, CAT812 PIN DESCRIPTIONS
Pin Number CAT811 1 2 -- CAT812 1 -- 2 GND RESET RESET Ground 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. Active HIGH reset. RESET is asserted if VCC falls below the reset threshold and remains high for at least 140ms after VCC rises above the reset threshold. Manual Reset Input. A logic LOW on MR asserts RESET. RESET remains active as long as MR is LOW and for 140ms after MR returns HIGH. The active low input has an internal 20k pull-up resistor. The input should be left open if not used. It can be driven by TTL or CMOS logic or shorted to ground by a switch. Power supply voltage that is monitored. Name Description
3
3
MR
4
4
VCC
Patent Pending
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Doc. No. 3005, Rev. P
CAT811, CAT812 ABSOLUTE MAXIMUM RATINGS*
Any pin with respect to ground .......... -0.3 V to +6.0 V Input Current, VCC ............................................. 20 mA Output Current, RESET, RESET ...................... 20 mA Rate of Rise, VCC ............................................................. 100 V/s Continuous Power Dissipation Derate 4mW/C above 70C (SOT143) ........ 320 mW Operating Temperature Range ........... -40C to +85C Storage Temperature Range ............ -65C to +105C Lead Soldering Temperature (10 sec) .............. 300C
*COMMENT 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.
ELECTRICAL CHARACTERISTICS VCC = Full range, TA = -40C to +85C unless otherwise noted. Typical values at TA = +25C and VCC = 5 V for the L/M/J versions, VCC = 3.3 V for the T/S versions, VCC=3 V for the R version and VCC = 2.5 V for the Z version.
Parameter VCC Range Symbol Conditions TA = 0C to +70C TA = -40C to +85C Supply Current ICC TA = -40C to +85C VCC < 5.5 V, J/L/M VCC < 3.6 V, R/S/T/Z TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C J Threshold TA = -40C to +85C TA = +25C TA = -40C to +85C S Threshold TA = +25C TA = -40C to +85C TA = +25C R Threshold TA = -40C to +85C TA = +25C TA = -40C to +85C 4.56 4.50 4.31 4.25 3.93 3.89 3.04 3.00 2.89 2.85 2.59 2.55 2.28 2.25 2.32 2.63 2.93 3.08 4.00 4.38 Min 1.0 1.2 8 6 4.63 Typ Max 5.5 5.5 20 15 4.70 4.75 4.45 4.50 4.06 4.10 3.11 3.15 2.96 3.00 2.66 2.70 2.35 2.38 Units
V A
L Threshold
M Threshold
Reset Threshold Voltage VTH
T Threshold
V
Z Threshold
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Patent Pending
CAT811, CAT812
ELECTRICAL CHARACTERISTICS (continued) VCC = Full range, TA = -40C to +85C unless otherwise noted. Typical values at TA = +25C and VCC = 5 V for L/M/J versions, VCC = 3.3 V for T/S versions, VCC = 3 V for R version and VCC = 2.5 V for Z version. Parameter
Reset Threshold Tempco VCC to Reset Delay (Note 2) Reset Active Timeout Period VCC = VTH to (VTH - 100 mV) TA = -40C to +85C VCC = VTH min, ISINK = 1.2 mA RESET Output Voltage Low (Push-pull, active LOW, CAT811) CAT811R/S/T/Z VOL VCC = VTH min, ISINK = 3.2 mA CAT811J/L/M VCC > 1.0 V, ISINK = 50 A VCC = VTH max, ISOURCE = 500 A RESET Output Voltage High (Push-pull, active LOW, CAT811) VOH CAT811R/S/T/Z VCC = VTH max, ISOURCE = 800 A CAT811J/L/M VCC > VTH max, ISINK = 1.2 mA RESET Output Voltage Low (Push-pull, active HIGH, CAT812) RESET Output Voltage High (Push-pull active HIGH, CAT812) MR Minimum Pulse Width MR Glitch Immunity MR to RESET Propagation Delay tMD VIH MR Input Threshold VIL VIH VIL MR Pull-up Resistance
Note 1: Production testing done at TA = +25C; limits over temperature guaranteed by design only. Note 2: RESET output for the CAT811; RESET output for the CAT812 Note 3: Glitches of 100 ns or less typically will not generate a reset pulse.
Symbol
Conditions
Min
Typ(1)
30 20
Max
Units
ppm/C s
140
240
400 0.3
ms
0.4 0.3 0.8 VCC
V
V VCC - 1.5 0.3 V 0.4
CAT812R/S/T/Z VOL VCC > VTH max, ISINK = 3.2 mA CAT812J/L/M VOH 1.8 V < VCC VTH min, ISOURCE = 150 A 0.8 VCC
V
tMR Note 3
10 100
s ns s
Note 2 VCC > VTH (MAX), CAT811/812L/M/J 2.3 V
0.5
0.8 V VCC > VIH (MAX), CAT811/812R/S/T/Z 0.7VCC
0.25VCC
10
20
30
k
Patent Pending
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Doc. No. 3005, Rev. P
CAT811, CAT812
TYPICAL OPERATING CHARACTERISTICS VCC = Full range, TA = -40C to +85C unless otherwise noted. Typical values at TA = +25C and VCC = 5 V for L/M/J versions, VCC=3.3 V for T/S versions, VCC = 3 V for R version and VCC = 2.5 V for Z version.
POWER-UP RESET TIMEOUT VS. TEMPERATURE SUPPLY CURRENT VS. TEMPERATURE (NO LOAD, CAT8xxR/S/T/Z) 12 VCC=5.5V
POWER-UP RESET TIMEOUT (mS)
260
SUPPLY CURRENT (A)
240 220 200
VCC=5V
10 8 6 4 2 0
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 VS. TEMPERATURE (CAT8xxR/S/T/Z)
NORMALIZED RESET THRESHOLD VS. TEMPERATURE 1.0002
POWER-DOWN RESET DELAY (S)
14
NORMALIZED THRESHOLD
0 50 100 150
12 10 8 6 4 2 0 -50
1 0.9998 0.9996 0.9994 0.9992 0.999 0.9988 0 20 40 60 80 100 120
TEMPERATURE (C)
TEMPERATURE (C)
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Patent Pending
CAT811, CAT812 DETAILED DESCRIPTIONS
RESET TIMING The reset signal is asserted LOW for the CAT811 and HIGH for the CAT812 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.
Threshold Voltage Reset Timeout Period 140ms minimum
Power 5V Supply Voltage 0V
RESET
5V 0V 5V
CAT811
RESET 0V
CAT812
Figure 1. Reset Timing Diagram
VCC TRANSIENT RESPONSE The CAT811/812 protect Ps against brownout failure. Short duration transients of 4sec or less and 100 mV amplitude typically do not cause a false RESET. Figure 2 shows the maximum pulse duration of negative-going 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).
30
TRANSIENT DURATION [s)
25 20 15 10 5 0 1 10 CAT8xxM
TAMB = 25C
CAT8xxZ
100
1000
RESET OVERDRIVE VTH - VCC [mV]
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
Patent Pending
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Doc. No. 3005, Rev. P
CAT811, CAT812
VALID RESET WITH VCC UNDER 1.0 V To ensure that the CAT811 RESET pin is in a known state when VCC is under 1.0 V, a 100 k pull-down resistor between RESET pin and GND is recommended; the value is not critical. For the CAT812, a pull-up resistor from RESET pin to VCC is needed.
Power Supply VCC
Power Supply VCC
CAT812 CAT811
RESET GND 100k GND RESET
100k
FIGURE 3. RESET Valid with VCC Under 1.0 V
FIGURE 4. RESET Valid with VCC Under 1.1 V
BI-DIRECTIONAL RESET PIN INTERFACING The CAT811/812 can interface with P/C bi-directional reset pins by connecting a 4.7 k resistor in series with the CAT811/812 reset output and the P/C bi-directional reset pin.
BUF Power Supply VCC
Buffered RESET
CAT811
4.7k RESET GND Bi-directional I/O Pin
P
RESET INPUT GND (For example: 68HC11)
FIGURE 5. Bi-directional Reset Pin Interfacing
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Patent Pending
CAT811, CAT812
OTHER SUPERVISORY PRODUCTS Function
With 16k Bit Serial EEPROM Memory Watchdog Timer Manual Reset Input Active Low Reset Active High Reset Dual Polarity Reset Outputs Package 8-pin DIP and SOIC 8-pin DIP and SOIC 3-pin SOT23 and SC70 3-pin SOT23 and SC70 4-pin SOT143 4-pin SOT143
CAT1161/3
CAT1162
CAT809
CAT810
CAT811
CAT812
PACKAGE INFORMATION Plastic SOT143 (4-Pin)
2.05 MAX 1.78 MIN
2.64 MAX 2.10 MIN
0.20 0.89 MAX 0.76 MIN
0.51 MAX 0.37 MIN
3.04 MAX 2.80 MIN
1.40 MAX 1.20 MIN 0.18 MAX 0.085 MIN
1.12 MAX 0.89 MIN
0.94 MAX 0.88 MIN
0.20 GAUGE PLANE
0.10 MAX 0.013 MIN
0.54 REF
0.41 MAX 0.21 MIN
Patent Pending
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Doc. No. 3005, Rev. P
CAT811, CAT812 REVISION HISTORY
Date 10/22/03 12/22/2003 Rev. L M Reason Updated Ordering Information Updated Features Replaced power-up reset timeout vs. temperature graph with updated one Relaced VCC Transient Response graph with updated one Updated Features Updated Description Updated Ordering Information Added Top Markings Updated Absolute Maximum Ratings Updated Electrical Characteristics Updated Detailed Description Changed Preliminary designation to Final Updated Top Markings Updated Electrical Characteristics (Reset Active Timeout Period Max) Corrected Pin Configure diagram
3/22/04
N
3/25/2004
O
3/25/2004
P
Doc. No. 3005, Rev. P
10
Patent Pending
Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP TM AE2 TM
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents issued to Catalyst Semiconductor contact the Company's corporate office at 408.542.1000.
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 1250 Borregas Avenue Sunnyvale, CA 94089 Phone: 408.542.1000 Fax: 408.542.1200 www.catalyst-semiconductor.com
Publication #: Revison: Issue date: Type:
3005 P 3/25/04 Final Patent Pending

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