CATALYST CAT811S

H
EE
GEN FR
ALO
CAT811, CAT812
4-Pin Microprocessor Power Supply Supervisors
LE
A D F R E ETM
FEATURES
■ Precision monitoring of
■ 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
MAX812 in applications operating over the
industrial temperature range
■ Reset valid down to VCC = 1.0 V
■ 6 µA power supply current
■ Offered in two output configurations:
■ Power supply transient immunity
- CAT811: Active LOW reset
- CAT812: Active HIGH reset
■ Compact 4-pin SOT143 package
■ Industrial temperature range: -40˚C to +85˚C
■ Manual reset input
APPLICATIONS
■ Computers
■ Embedded control systems
■ Servers
■ White goods
■ Laptops
■ Power meters
■ Cable modems
■ Intelligent instruments
■ Wireless communications
■ PDAs and handheld equipment
DESCRIPTION
The CAT811 and CAT812 are µP 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.
offered to support +5.0 V, +3.3 V, +3.0 V and +2.5 V
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. 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
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.
THRESHOLD SUFFIX SELECTOR
PIN CONFIGURATION
Nominal Threshold
Voltage
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
2.32V
The CAT811 features a RESET push-pull output (active
LOW) and the CAT812 features a RESET push-pull
output (active HIGH).
The CAT811/812 are fully specified over the industrial
temperature range (-40˚C to 85˚C) and are available in
a compact 4-pin SOT143 package.
Threshold Suffix
Designation
L
M
J
T
S
R
Z
© 2004 by Catalyst Semiconductor, Inc., Patent Pending
Characteristics subject to change without notice
GND
1
4
VCC
CAT811
(CAT812)
RESET
(RESET)
1
2
3
Doc. No. 3005, Rev. P
CAT811, CAT812
ORDERING INFORMATION
Ordering Part Number
RESET Polarity
Package
Parts per Reel
CAT811_EUS-T
Push-Pull RESET
4-pin, SOT143
3k
CAT811_EUS-T10
Push-Pull RESET
4-pin, SOT143
10k
CAT811_TBI-T
Push-Pull RESET
4-pin, SOT143 Green
3k
CAT811_TBI-T10
Push-Pull RESET
4-pin, SOT143 Green
10k
CAT812_EUS-T
Push-Pull RESET
4-pin, SOT143
3k
CAT812_EUS-T10
Push-Pull RESET
4-pin, SOT143
10k
CAT812_TBI-T
Push-Pull RESET
4-pin, SOT143 Green
3k
CAT812_TBI-T10
Push-Pull RESET
4-pin, SOT143 Green
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
SOT143 Green
CAT811L
AMYM
DHYM
CAT811M
ANYM
DJYM
CAT811J
AZYM
CKYM
CAT811T
APYM
DLYM
CAT811S
AQYM
DMYM
CAT811R
ARYM
DNYM
CAT811Z
AYYM
CPYM
CAT812L
ASYM
DRYM
CAT812M
ATYM
DTYM
CAT812J
AUYM
DUYM
CAT812T
AVYM
DVYM
CAT812S
AWYM
DWYM
CAT812R
AXYM
DXYM
CAT812Z
CIYM
CYYM
Where YM stands for Year and Month.
Doc. No. 3005, Rev. P
2
Patent Pending
CAT811, CAT812
PIN DESCRIPTIONS
Pin Number
Name
Description
1
GND
Ground
2
—
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.
—
2
RESET
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.
3
3
MR
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 20kΩ 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.
4
4
VCC
Power supply voltage that is monitored.
CAT811
CAT812
1
Patent Pending
3
Doc. No. 3005, Rev. P
CAT811, CAT812
Operating Temperature Range ........... -40°C to +85°C
ABSOLUTE MAXIMUM RATINGS*
Storage Temperature Range ............ -65°C to +105°C
Any pin with respect to ground .......... -0.3 V to +6.0 V
Lead Soldering Temperature (10 sec) .............. 300°C
Input Current, VCC ............................................. 20 mA
Output Current, RESET, RESET ...................... 20 mA
*COMMENT
Rate of Rise, VCC ............................................................. 100 V/µs
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.
Continuous Power Dissipation
Derate 4mW/˚C above 70˚C (SOT143) ........ 320 mW
ELECTRICAL CHARACTERISTICS
VCC = Full range, TA = -40°C to +85°C unless otherwise noted. Typical values at TA = +25˚C 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
Symbol
VCC Range
Supply Current
ICC
Conditions
5.5
TA = -40˚C to +85˚C
1.2
5.5
TA = -40˚C to +85˚C
J Threshold
Reset
T Threshold
VTH
S Threshold
R Threshold
Z Threshold
Doc. No. 3005, Rev. P
Max
1.0
M Threshold
Voltage
Typ
TA = 0˚C to +70˚C
L Threshold
Threshold
Min
VCC < 5.5 V, J/L/M
8
20
VCC < 3.6 V, R/S/T/Z
6
15
4.63
4.70
TA = +25˚C
4.56
TA = -40˚C to +85˚C
4.50
TA = +25˚C
4.31
TA = -40˚C to +85˚C
4.25
TA = +25˚C
3.93
TA = -40˚C to +85˚C
3.89
TA = +25˚C
3.04
TA = -40˚C to +85˚C
3.00
TA = +25˚C
2.89
TA = -40˚C to +85˚C
2.85
TA = +25˚C
2.59
TA = -40˚C to +85˚C
2.55
TA = +25˚C
2.28
TA = -40˚C to +85˚C
2.25
4
Units
V
µA
4.75
4.38
4.45
4.50
4.00
4.06
4.10
3.08
3.11
3.15
2.93
V
2.96
3.00
2.63
2.66
2.70
2.32
2.35
2.38
Patent Pending
CAT811, CAT812
ELECTRICAL CHARACTERISTICS (continued)
VCC = Full range, TA = -40˚C to +85˚C unless otherwise noted. Typical values at TA = +25˚C 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
Symbol
Conditions
Min
Reset Threshold Tempco
VCC to Reset Delay (Note 2)
VCC = VTH to (VTH - 100 mV)
Reset Active Timeout Period
TA = -40˚C to +85˚C
140
Typ(1)
ppm/˚C
20
µs
240
VCC = VTH min, ISINK = 3.2 mA
0.4
CAT811J/L/M
VCC > 1.0 V, ISINK = 50 µA
VCC = VTH max, ISOURCE = 500 µA
RESET Output Voltage High
(Push-pull, active LOW,
CAT811)
VOH
VCC = VTH max, ISOURCE = 800 µA
V
0.8 VCC
V
VCC - 1.5
VCC > VTH max, ISINK = 1.2 mA
0.3
CAT812R/S/T/Z
VOL
ms
0.3
CAT811R/S/T/Z
CAT811J/L/M
RESET Output Voltage Low
(Push-pull, active HIGH,
CAT812)
400
0.3
CAT811R/S/T/Z
VOL
Units
30
VCC = VTH min, ISINK = 1.2 mA
RESET Output Voltage Low
(Push-pull, active LOW,
CAT811)
Max
V
VCC > VTH max, ISINK = 3.2 mA
0.4
CAT812J/L/M
RESET Output Voltage High
(Push-pull active HIGH,
CAT812)
MR Minimum Pulse Width
VOH
1.8 V < VCC ≤ VTH min, ISOURCE = 150 µA
tMR
MR Glitch Immunity
0.8 VCC
V
10
µs
Note 3
100
ns
tMD
Note 2
0.5
µs
VIH
VCC > VTH (MAX), CAT811/812L/M/J
MR to RESET Propagation
Delay
MR Input Threshold
2.3 V
VIL
0.8
V
VIH
VCC > VIH (MAX), CAT811/812R/S/T/Z
0.7VCC
VIL
0.25VCC
MR Pull-up Resistance
10
20
30
kΩ
Note 1: Production testing done at TA = +25˚C; 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.
Patent Pending
5
Doc. No. 3005, Rev. P
CAT811, CAT812
TYPICAL OPERATING CHARACTERISTICS
VCC = Full range, TA = -40˚C to +85˚C unless otherwise noted. Typical values at TA = +25˚C 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.
SUPPLY CURRENT VS. TEMPERATURE
(NO LOAD, CAT8xxR/S/T/Z)
260
12
240
SUPPLY CURRENT (µA)
POWER-UP RESET TIMEOUT (mS)
POWER-UP RESET TIMEOUT
VS. TEMPERATURE
VCC=5V
220
200
VCC=2.5V
180
VCC=5.5V
10
8
VCC=3.6V
6
4
2
0
160
-50
0
50
100
-50
150
0
TEMPERATURE (˚C)
1.0002
NORMALIZED THRESHOLD
POWER-DOWN RESET DELAY (µS)
150
NORMALIZED RESET THRESHOLD
VS. TEMPERATURE
14
12
10
8
6
4
2
1
0.9998
0.9996
0.9994
0.9992
0.999
0.9988
0
50
100
150
0
TEMPERATURE (˚C)
Doc. No. 3005, Rev. P
100
TEMPERATURE (˚C)
POWER-DOWN RESET DELAY VS. TEMPERATURE
(CAT8xxR/S/T/Z)
0
-50
50
20
40
60
80
100
120
TEMPERATURE (˚C)
6
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
Power 5V
Supply
Voltage 0V
RESET
Reset Timeout Period
140ms
minimum
5V
CAT811
0V
5V
RESET
CAT812
0V
Figure 1. Reset Timing Diagram
VCC TRANSIENT RESPONSE
The CAT811/812 protect µPs against brownout failure. Short duration transients of 4µsec 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).
TRANSIENT DURATION [µs)
30
TAMB = 25°C
25
20
15
CAT8xxZ
10
5
CAT8xxM
0
1
10
100
1000
RESET OVERDRIVE VTH - VCC [mV]
Figure 2. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
Patent Pending
7
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 kΩ 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
Power
Supply
VCC
VCC
CAT812
CAT811
100kΩ
RESET
RESET
100kΩ
GND
GND
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 µP/µC bi-directional reset pins by connecting a 4.7 kΩ resistor in series with the
CAT811/812 reset output and the µP/µC bi-directional reset pin.
BUF
Power
Supply
Buffered
RESET
VCC
CAT811
µP
4.7kΩ
RESET
INPUT
RESET
(For example: 68HC11)
GND
GND
Bi-directional I/O Pin
FIGURE 5. Bi-directional Reset Pin Interfacing
Doc. No. 3005, Rev. P
8
Patent Pending
CAT811, CAT812
OTHER SUPERVISORY PRODUCTS
Function
CAT1161/3
CAT1162
CAT809
CAT810
CAT811
8-pin
DIP and SOIC
8-pin
DIP and SOIC
3-pin
SOT23 and
SC70
3-pin
SOT23 and
SC70
4-pin
SOT143
CAT812
With 16k Bit Serial EEPROM Memory
Watchdog Timer
Manual Reset Input
Active Low Reset
Active High Reset
Dual Polarity Reset Outputs
Package
4-pin
SOT143
PACKAGE INFORMATION
Plastic SOT143 (4-Pin)
2.05 MAX
1.78 MIN
2.64 MAX
2.10 MIN
0.51 MAX
0.37 MIN
0.20
0.89 MAX
0.76 MIN
1.40 MAX
1.20 MIN
3.04 MAX
2.80 MIN
0.18 MAX
0.085 MIN
0.94 MAX
0.88 MIN
1.12 MAX
0.89 MIN
0.20
GAUGE PLANE
0.10 MAX
0.013 MIN
Patent Pending
0.54 REF
9
0.41 MAX
0.21 MIN
Doc. No. 3005, Rev. P
CAT811, CAT812
REVISION HISTORY
Date
10/22/03
12/22/2003
3/22/04
Rev.
L
M
N
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
3/25/2004
O
3/25/2004
P
Doc. No. 3005, Rev. P
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
10
Patent Pending
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DPP ™
AE2 ™
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.
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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.
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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