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Impala Linear Corporation
ILC811/812
Preliminary
Microprocessor Reset Circuits
General Description The ILC811/ILC812 is a low cost microprocessor supervisory circuit that asserts a reset if the power supply drops below a designated threshold or the manual reset pin is forced low. Several different reset thresholds are available to accommodate systems operating at 3V, 3.3V or 5V. The ILC811 has an active low RESET output, while the ILC812 offers an active high RESET output. The reset output is guaranteed to remain asserted for a minimum of 140ms after VCC has risen above the designated reset threshold. The ILC811/ILC812 is available in a 4-pin SOT-143
Features
! Precision Voltage Monitor for 3V, 3.3V or 5V Power Supplies ! 6mA Supply Current ! 140ms Minimum Reset Pulse Width ! RESET Remains Valid with VCC as Low as 1.4V ! Active Low Manual Reset Input ! No External Components ! 4-Pin SOT-143 Package
Applications
Typical Circuit
VCC
VCC ILC811 ILC812
MR RESET (RESET)
VCC
! Critical Microprocessor Power Monitoring ! Portable Equipment ! Intelligent Instruments ! Computers & Printers ! Controllers
P
RESET INPUT
Ordering Information
Part ILC811_U ILC812_U Package 4-Lead SOT-143 4-Lead SOT-143 Temp. Range -40C to +85C -40C to +85C
( ) = ILC812
Place the device suffix of desired reset threshold voltage from the table [below] in the blank to complete the part number.
Pin Package Configuration
Top View
GND 1 ILC811
RESET 2 3 MR 4
VCC
Reset Threshold Voltage (V) 4.63 4.38 4.00 3.08 2.93 2.63
Device Suffix L M J T S R
GND 1 ILC812
RESET 2
4
VCC
3
MR
Impala Linear Corporation
ILC811/812 1.3
(408) 574-3939
www.impalalinear.com
Sept 1999
1
Microprocessor Reset Circuits
Preliminary
Absolute Maximum Ratings
Parameter Terminal Voltage Input Current Output Current Rate of Rise Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering - 10 sec.) Power Dissipation (TA = +70C) Symbol VCC MR VCC, MR RESET, RESET VCC TA Ratings -0.3 to 6.0 -0.3 to (VCC + 0.3) 20 20 100 -40 to +85 -65 to +150 300 320 Units V V mA mA V/s C C C mW
Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed.
Electrical Characteristics
VCC = 5V for ILC81_L/M/J, VCC = 3.3V for ILC81_S/T, VCC = 3V for ILC81_R, TA = Operating Temperature Range, unless
otherwise noted.
Parameter Operating Voltage Range, VCC Supply Current, ICC Reset Voltage Threshold, VTH Conditions TA = 0C to 70C TA = -40C to 85C ILC811L/M/J, ILC812L/M/J VCC < 3.6V, ILC811R/S/T, ILC812R/S/T ILC811L, ILC812L ILC811M, ILC812M ILC811J, ILC812J ILC811T, ILC812T ILC811S, ILC812S ILC811R, ILC812R ISOURCE = 800A, ILC811L/M/J ISOURCE = 500A, ILC811R/S/T VCC = VTH Min., ISINK = 3.2mA, ILC811L/M/J VCC = VTH Min., ISINK = 1.2mA, ILC811R/S/T VCC > 1.4V, ISINK = 50A, TA = 0C to 70C VCC > 1.6V, ISINK = 50A, TA = -40C to 85C Min 1.4 1.6 Typ Max 5.5 5.5 15 10 4.75 4.50 4.10 3.15 3.00 2.70 560 Units V A V
Reset Timeout Period, tR RESET Output Voltage, VOH RESET Output Voltage, VOL
4.50 4.25 3.89 3.00 2.85 2.55 140 VCC - 1.5 0.8 x VCC
9 6 4.63 4.38 4.00 3.08 2.93 2.63 240
ms V
0.4 0.3 0.3 0.3
V
RESET Output Voltage, VOH RESET Output Voltage, VOL MR Minimum Pulse Width MR to Reset Delay MR Input Threshold, VIH MR Input Threshold, VIL MR Pull-Up Resistance MR Glitch Immunity
1.8V < VCC < VTH Min., ISOURCE= 150A ISINK = 3.2mA, ILC812L/M/J ISINK = 1.2mA, ILC812R/S/T
0.8 x VCC 0.4 0.3 10 0.5
V V s s V 0.8 0.25 x VCC 30 V
VCC > VTH Max., ILC81_L/M/J ILC81_R/S/T VCC > VTH Max., ILC81_L/M/J ILC81_R/S/T
2.3 0.7 x VCC
10
20 100
k ns
Impala Linear Corporation
ILC811/812 1.3
(408) 574-3939
www.impalalinear.com
Sept 1999
2
Microprocessor Reset Circuits
Preliminary
Pin Functions
Pin Name GND RESET Pin Number ILC811 ILC812 1 2 1 N/A Description Ground Pin. RESET goes low if VCC falls below the reset threshold and remains asserted for one reset timeout period (140ms min.) after VCC exceeds the reset threshold. RESET goes high if VCC falls below the reset threshold and remains asserted for one reset timeout period (140ms min.) after VCC exceeds the reset threshold. Manual reset input. A logic low on MR forces a reset. The reset will remain asserted as long as MR is held low and for one reset timeout period (140ms min.) after MR goes high. This input can be shorted to ground via a switch or driven from CMOS or TTL logic. Float if unused. Power supply input, 3V, 3.3V or 5V.
RESET
N/A
2
MR
3
3
VCC
4
4
Circuit Description
Microprocessor Reset The RESET pin is asserted whenever VCC falls below the reset threshold voltage or if MR (manual reset) is forced low. The reset pin remains asserted for a period of 240ms after VCC has risen above the reset threshold voltage or MR has returned high. The reset function ensures the microprocessor is properly reset and powers up into a known condition after a power failure. RESET will remain valid with VCC as low as 1.4V.
VCC VTH
VCC
4 Reset Threshold (V)
+ Reset Generator 2
RESET (ILC811) RESET (ILC812)
MR
3
1
GND
MR tR RESET tR
RESET Valid to 0V A resistor can be added from the RESET pin to ground to ensure the RESET output remains low with VCC down to 0V. A 100kW resistor connected from RESET to ground is recommended. The size of the resistor should be large enough to not load the RESET output and small enough to pull-down any stray leakage currents.
VCC
VCC VCC
VCC Transients The ILC811/ILC812 are relatively immune to negative-going VCC glitches below the reset threshold. Typically, a negative-going transient 125V below the reset threshold with a duration of 50ms (25s for ILC81_R/S/T) or less will not cause an unwanted reset. Interfacing to Bidirectional Reset Pins The ILC811/ILC812 can interface with Ps with bidirectional reset pins by connecting a 4.7k resistor in series with the ILC811/ILC812 output and the P reset pin.
ILC811
RESET 100 K RESET
P
Reset Valid to VCC =0V
Impala Linear Corporation
ILC811/812 1.3
(408) 574-3939
www.impalalinear.com
Sept 1999
3
Microprocessor Reset Circuits
Preliminary
Alternate Source Cross Reference Guide
Industry P/N MAX811JEUS-T MAX811LEUS-T MAX811MEUS-T MAX811REUS-T MAX811SEUS-T MAX811TEUS-T MAX812JEUS-T MAX812LEUS-T MAX812MEUS-T MAX812REUS-T MAX812SEUS-T MAX812TEUS-T
ILC Direct Replacement ILC811JU ILC811LU ILC811MU ILC811RU ILC811SU ILC811TU ILC812JU ILC812LU ILC812MU ILC812RU ILC812SU ILC812TU
Device Marking Information SOT-143 ILC811J KJYY ILC811L KLYY ILC811M KMYY ILC811R KRYY ILC811S KSYY ILC811T KTYY ILC812J LJYY ILC812L LLYY ILC812M LMYY ILC812R LRYY ILC812S LSYY ILC812T LTYY YY = Lot Code
Impala Linear Corporation
ILC811/812 1.3
(408) 574-3939
www.impalalinear.com
Sept 1999
4
Microprocessor Reset Circuits
Preliminary
Packaging Information
4-Pin SOT-143
0.079 0.071
0.055 0.047
0.098 0.083
Dimensions are in inches
0.037 0.030
0.021 0.015
0.120 0.105 0.040 0.031 0.080 0.070 0.0059 0.0035 0-8
0.004 0.001
0.010 0.005
Tape and Reel Information
4.0 0.1 2.0 0.05 O1.5 0.1 1.75 0.1
3.5 0.05 8.0 0.3
O1.1 0.1 4.0 0.1 2.7 0.1
1.2 0.1
Dimensions are in millimeters
3.1 0.1
Devices sold by Impala Linear Corporation are covered by the warranty and patent indemnification provisions appearing in its Terms of Sale only. Impala Linear Corporation makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. Impala Linear Corporation makes no warranty of merchantability or fitness for any purpose. Impala Linear Corporation reserves the right to discontinue production and change specifications and prices at any time and without notice. This product is intended for use in normal commercial applications. Applications requiring an extended temperature range, unusual environmental requirements, or high reliability applications, such as military and aerospace, are specifically not recommended without additional processing by Impala Linear Corporation. Impala Linear Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in an Impala Linear Corporation product. No other circuits, patents, licenses are implied.
Life Support Policy Impala Linear Corporation's products are not authorized for use as critical components in life support devices or systems. 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Impala Linear Corporation
ILC811/812 1.3
(408) 574-3939
www.impalalinear.com
Sept 1999
5

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