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MAX809/MAX810 3-pin microprocessor resets
Product data Supersedes data of 2002 Oct 21 2003 Aug 08
Philips Semiconductors
Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
DESCRIPTION
The MAX809/MAX810 are single function microprocessor resets used to monitor supply voltages in microprocessor and other logic systems. They provide a reset signal to the microprocessor during power-up, power-down, and brownout conditions. The reset signal is asserted when the supply voltage drops below the preset threshold, and the signal is released a set time after the supply voltage has risen above the preset threshold. The MAX809 has an active-LOW reset output while the MAX810 has an active-HIGH reset output. The low supply current of typically 17 A makes the MAX809/MAX810 ideal for use in portable, battery operated equipment. They are available in the 3-pin SOT23 and SC70 packages.
FEATURES
* Monitors 5.0 V, 3.3 V and 3 V supplies * 140 ms min. reset delay time:
- Active-LOW RESET output (MAX809) - Active-HIGH RESET output (MAX810)
* Power supply transient immunity * Guaranteed reset valid for 1.1 V * Available in small SOT23 and SC70 3-pin packages * No external components needed * Specified over full temperature range -40 C to +105 C
APPLICATIONS
* Embedded controllers * Battery operated systems * Wireless communication systems * PDAs and handheld equipment
SIMPLIFIED SYSTEM DIAGRAMS
VCC VCC VCC VCC VCC VCC
MAX809
RESET GND
MICROPROCESSOR
MAX810
RESET GND
MICROPROCESSOR
RESET INPUT GND
RESET INPUT GND
SL01642
SL01643
Figure 1. MAX809 simplified system diagram.
Figure 2. MAX810 simplified system diagram.
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
ORDERING INFORMATION
TYPE NUMBER MAX809xD MAX810xD MAX809xW MAX810xW PACKAGE NAME SOT23-3 SOT23-3 SC70-3 SC70-3 DESCRIPTION plastic small outline package; 3 leads (see dimensional drawing) plastic small outline package; 3 leads (see dimensional drawing) plastic small outline package; 3 leads; body width 1.15 mm plastic small outline package; 3 leads; body width 1.15 mm TEMPERATURE RANGE -40 to +105 C -40 to +105 C -40 to +105 C -40 to +105 C
NOTE: Each device has 7 voltage options, indicated by the `x' on the `Type number'. Part number MAX809 MAX809ZD, MAX809ZW MAX809RD, MAX809RW MAX809SD, MAX809SW MAX809TD, MAX809TW MAX809JD, MAX809JW MAX809MD, MAX809MW MAX809LD, MAX809LW 2.32 V 2.63 V 2.93 V 3.08 V 4.00 V 4.38 V 4.63 V Reset Threshold Voltage (Typical) Part number MAX810 MAX810ZD, MAX810ZW MAX810RD, MAX810RW MAX810SD, MAX810SW MAX810TD, MAX810TW MAX810JD, MAX810JW MAX810MD, MAX810MW MAX810LD, MAX810LW 2.32 V 2.63 V 2.93 V 3.08 V 4.00 V 4.38 V 4.63 V Reset Threshold Voltage (Typical)
Marking code
Each device is marked with a four letter code. The first three letters designate the product. The fourth, represented by an `x', designates the date tracking code. Part MAX809 MAX809JD MAX809LD MAX809MD MAX809RD, W MAX809SD MAX809TD MAX809ZD AMUx AMVx AMWx AMXx AMYx AMZx AMAx Marking Part MAX810 MAX810LD MAX810RD MAX810SD MAX810JD MAX810MD MAX810TD MAX810ZD ANTx ANUx ANVx ANWx ANXx ANYx ANZx Marking
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
PINNING
GND
1
GND
1
MAX809
RESET 2
3
VCC
MAX810
RESET 2
3
VCC
SL01641
SL01644
Figure 3. MAX809 pin configuration.
Figure 4. MAX810 pin configuration.
MAX809 pin description
PIN 1 2 3 SYMBOL GND RESET VCC DESCRIPTION Device ground. Active-LOW reset signal. Supply voltage input.
MAX810 pin description
PIN 1 2 3 SYMBOL GND RESET VCC DESCRIPTION Device ground. Active-HIGH reset signal. Supply voltage input.
MAXIMUM RATINGS
SYMBOL VCC Vi(RESET) Vi(RESET) Ii(VCC) Io PARAMETER Supply voltage Input voltage at RESET pin (MAX809) Input voltage at RESET pin (MAX810) Input current at VCC pin Output current Rate of rise at VCC Tamb Tstg P Ambient temperature Storage temperature Power dissipation Derate 4 mW/C above Tamb = 70 C CONDITIONS MIN. -0.3 -0.3 -0.3 - - - -40 -65 - MAX. 6.0 VCC + 0.3 VCC + 0.3 20 20 100 +105 +150 320 UNIT V V V mA mA V/s C C mW
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
ELECTRICAL CHARACTERISTICS
VCC = full range (Tamb = -40 C to +105 C) unless otherwise noted; typical values are at Tamb = +25 C, and VCC = 5 V (J/L/M versions), VCC = 3.3 V (T/S versions), VCC = 3 V (R version), and VCC = 2.5 V (Z version) (Note 1). SYMBOL PARAMETER VCC range ICC Supply current (SOT23-3) CONDITIONS Tamb = 0 C to +70 C Tamb = -40 C to +105 C MAX809J/L/M MAX810J/L/M MAX809R/S/T/Z MAX810R/S/T/Z MAX809J/L/M MAX810J/L/M MAX809R/S/T/Z MAX810R/S/T/Z ICC Supply current (SC70-3) MAX809J/L/M MAX810J/L/M MAX809R/S/T/Z MAX810R/S/T/Z MAX809J/L/M MAX810J/L/M MAX809R/S/T/Z MAX810R/S/T/Z Vth RESET threshold voltage (SOT23-3 d SC70-3) (SOT23 3 and SC70 3) MAX809Z MAX810Z VCC < 5.5 V; Tamb = -40 C to +85 C VCC < 3.6 V; Tamb = -40 C to +85 C VCC < 5.5 V; Tamb = +85 C to +105 C VCC < 3.6 V; Tamb = +85 C to +105 C VCC < 5.5 V; Tamb = -40 C to +85 C VCC < 3.6 V; Tamb = -40 C to +85 C VCC < 5.5 V; Tamb = +85 C to +105 C VCC < 3.6 V; Tamb = +85 C to +105 C Tamb = +25 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C MAX809R MAX810R Tamb = +25 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C MAX809S MAX810S Tamb = +25 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C MAX809T MAX810T Tamb = +25 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C MAX809J MAX810J Tamb = +25 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C MAX809M MAX810M Tamb = +25 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C MAX809L MAX810L Tamb = +25 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C Reset threshold temperature coefficient VCC to RESET delay RESET active time-out period (SOT23-3) (SOT23 3) RESET active time-out period (SC70-3) (SC70 3) VCC = Vth to (Vth - 100 mV) Tamb = -40 C to +85 C Tamb = +85 C to +105 C Tamb = -40 C to +85 C Tamb = +85 C to +105 C MIN. 1.0 1.2 - - - - - - - - 2.28 2.25 2.22 2.59 2.55 2.50 2.89 2.85 2.78 3.04 3.00 2.92 3.93 3.89 3.80 4.31 4.25 4.16 4.56 4.50 4.40 - - 140 100 140 100 TYP. - - 24 17 - - 24 17 - - 2.32 - - 2.63 - - 2.93 - - 3.08 - - 4.00 - - 4.38 - - 4.63 - - 30 20 240 - 240 - MAX. 5.5 5.5 60 50 100 100 35 30 60 60 2.35 2.38 2.42 2.66 2.70 2.76 2.96 3.00 3.08 3.11 3.15 3.23 4.06 4.10 4.20 4.45 4.50 4.56 4.70 4.75 4.86 - - 560 840 460 840 UNIT V V A A A A A A A A V V V V V V V V V V V V V V V V V V V V V ppm/C s ms ms ms ms
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
SYMBOL VOL(RESET) ( )
PARAMETER LOW-level output voltage i on RESET pin MAX809R/S/T/Z MAX809J/L/M MAX809 MAX809R/S/T/Z MAX809J/L/M MAX810R/S/T/Z MAX810J/L/M MAX810
CONDITIONS VCC > Vth(min); Isink = 1.2 mA VCC > Vth(min); Isink = 3.2 mA VCC > 1.0 V; Isink = 50 A VCC > Vth(max); Isource = 500 A VCC > Vth(max); Isource = 800 A VCC > Vth(max); Isink = 1.2 mA VCC > Vth(max); Isink = 3.2 mA 1.8 V < VCC > Vth(min); Isource = 150 A
MIN. - - - 0.8 x VCC VCC - 1.5 - - 0.8 x VCC
TYP. - - - - - - - -
MAX. 0.3 0.4 0.3 - - 0.3 0.4 -
UNIT V V V V V V V V
VOH(RESET) ( ) VOL(RESET) ( ) VOH(RESET)
HIGH-level output voltage on RESET pin i LOW-level output voltage on RESET pin i HIGH-level output voltage on RESET pin
NOTES: 1. Production testing done at Tamb = +25 C; limits over temperature guaranteed by design. 2. RESET output for MAX809; RESET output for MAX810.
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
APPLICATION INFORMATION Detailed description
A microprocessor reset ensures that the microprocessor starts in a known and safe state. The reset asserts a reset signal to prevent code execution errors during power up, power down, or brownout conditions. A reset must assert an output within a predictable range of the supply voltage. The common threshold voltage range is between 5% and 10% of the nominal supply voltage. MAX809/MAX810 have 4.63 V, 3.08 V and 2.63 V options for 5 V, 3.3 V and 3.0 V supplies respectively. They have high accuracy (within 3%) that ensures that the reset thresholds occur within the safe operating range. Whenever the supply voltage falls below the reset threshold, the reset signal is asserted. It remains asserted for at least 140 ms after the supply voltage rises above the threshold. At this point the reset is released. This delay time helps ensure valid reset signals despite erratic changes in supply voltage. The MAX809/MAX810 have a push-pull output stage and do not require a pull-up resistor. relatively large resistor from RESET to ground as shown in Figure 6. 100 k is small enough to provide a path for any leakage currents to flow to ground (holding RESET LOW); while it is large enough not to load RESET. Conversely, a 100 k pull-up resistor is recommended for MAX810 if RESET is required to remain valid for VCC < 1 V.
VCC
VCC
VCC
RESET
RESET
MAX809
100 k
MICROPROCESSOR
Negative-going VCC transients
The MAX809/MAX810 are relatively immune to short negative-going VCC transients and glitches. Figure 5 shows the maximum pulse width a negative-going transient can have without causing a reset signal. As the magnitude of the transient increases below the reset threshold, the maximum allowable pulse width decreases. Typically, for the 4.0 V, 4.38 V, and 4.63 V versions of the MAX809/MAX810, a VCC transient that goes 100 mV below the reset threshold and lasts 20 s or less will not cause a reset signal. To provide additional transient rejection, connect a 10 nF bypass capacitor as close as possible to the VCC pin.
450 MAXIMUM TRANSIENT DURATION ( s) 400 350 300 250 200 MAX809/MAX810J/L/M 150 100 50 0 1 10 100 1000 MAX809/ MAX810R/S/T/Z
GND
GND
SL01726
Figure 6. RESET valid to VCC = 0 V circuit.
Interfacing to microprocessors with bi-directional reset pins
Microprocessors with bi-directional reset I/Os, such as the Motorola 68HC11 series, can be connected to the MAX809 RESET output. To ensure a correct output on the MAX809, even when the microprocessor reset I/O is in the opposite state, connect a 4.7 k resistor between the reset pins as shown in Figure 7. This allows the microprocessor to issue commands to the system regardless of the state of the RESET. The bi-directional microprocessor reset functions both as a driven reset input and as an active reset driver.
VCC
VCC
VCC
4.7 k RESET RESET
RESET COMPARATOR OVERDRIVE, Vth - VCC (mV)
SL01728
MAX809
Figure 5. Maximum transient duration without causing a reset pulse versus reset comparator overdrive.
GND
MOTOROLA 68HCxx
GND
Ensuring a valid reset output down to VCC = 0 V
When VCC falls below 1 V, the MAX809 RESET no longer sinks current (i.e., it becomes open circuit). A high impedance CMOS logic input connected to RESET can drift to undetermined voltages. In most applications in which the microprocessor circuitry is inoperative below 1 V, this will not represent a problem. However, in applications in which RESET must be valid down to 0 V, use a
SL01727
Figure 7. Interfacing to microprocessor with bi-directional reset I/O
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
PACKING METHOD
The MAX809 and MAX810 are packed in reels, as shown in Figure 8.
GUAR D BAND
TAPE
REEL ASSEMBLY
TAPE DETAIL
COVER TAPE
CARRIER TAPE
BARCODE LABEL
BOX
SL01305
Figure 8. Tape and reel packing method.
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
SOT23-3: plastic small outline package; 3 leads; body width 1.5 mm
3
1
2
1.35
0.15 0.05
1.2 1.0
0.25
0.50 0.25
0.22 0.08
3.00 2.70
1.70 1.50
0.55 0.35
10 0
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
SC70-3: plastic small outline package; 3 leads; body width 1.15 mm
1.0 0.8
0.4 0.25
0.225 0.10
2.1 1.9
0.4 0.1
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
REVISION HISTORY
Rev _3 Date 20030808 Description Product data (9397 750 11889); ECN 853-2355 30184 dated 04 August 2003. Supersedes MAX809_MAX810_2 of 2002 Oct 21 (9397 750 10584).
* Add `Marking code' table to Ordering information on page 3. * SOT23-3 package outline on page 9 corrected.
_2 _1 20021021 20020620 Product data (9397 750 10584); ECN 853-2355 29047 dated 14 October 2002. Supersedes MAX809_MAX810_1 of 2002 June 20 (9397 750 10213). Product data (9397 750 10213); ECN 853-2355 28505 dated 20 June 2002.
Modifications:
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Philips Semiconductors
Product data
3-pin microprocessor resets
MAX809/MAX810
Data sheet status
Level
I
Data sheet status [1]
Objective data
Product status [2] [3]
Development
Definitions
This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN).
II
Preliminary data
Qualification
III
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products--including circuits, standard cells, and/or software--described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Date of release: 08-03
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 11889
Philips Semiconductors
2003 Aug 08 12

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