MAX809/MAX810
3-pin microprocessor resets
Product data
Supersedes data of 2002 Jun 20 2002 Oct 21
INTEGRATED CIRCUITS
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2
2002 Oct 21
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 µA 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
GND GND
RESET RESET INPUT
SL01642
MAX809 MICROPROCESSOR
Figure 1. MAX809 simplified system diagram.
VCC VCC
VCC
GND GND
RESET RESET INPUT
SL01643
MAX810 MICROPROCESSOR
Figure 2. MAX810 simplified system diagram.
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 3
ORDERING INFORMATION
TYPE NUMBER
PACKAGE TEMPERATURE
TYPE
NUMBER
NAME DESCRIPTION RANGE
MAX809xD SOT23-3 plastic small outline package; 3 leads (see dimensional drawing) –40 to +105 °C
MAX810xD SOT23-3 plastic small outline package; 3 leads (see dimensional drawing) –40 to +105 °C
MAX809xW SC70-3 plastic small outline package; 3 leads; body width 1.15 mm –40 to +105 °C
MAX810xW SC70-3 plastic small outline package; 3 leads; body width 1.15 mm –40 to +105 °C
NOTE:
Each device has 7 voltage options, indicated by the ‘x’ on the ‘Type number’.
Part number Reset Threshold Voltage (T ypical) Part number Reset Threshold Voltage (Typical)
MAX809 MAX810
MAX809ZD,
MAX809ZW 2.32 V MAX810ZD,
MAX810ZW 2.32 V
MAX809RD,
MAX809RW 2.63 V MAX810RD,
MAX810RW 2.63 V
MAX809SD,
MAX809SW 2.93 V MAX810SD,
MAX810SW 2.93 V
MAX809TD,
MAX809TW 3.08 V MAX810TD,
MAX810TW 3.08 V
MAX809JD,
MAX809JW 4.00 V MAX810JD,
MAX810JW 4.00 V
MAX809MD,
MAX809MW 4.38 V MAX810MD,
MAX810MW 4.38 V
MAX809LD,
MAX809LW 4.63 V MAX810LD,
MAX810LW 4.63 V
PINNING
SL01641
1
3
2
VCC
RESET
GND
MAX809
Figure 3. MAX809 pin configuration.
MAX809 pin description
PIN SYMBOL DESCRIPTION
1 GND Device ground.
2 RESET Active-LOW reset signal.
3 VCC Supply voltage input.
SL01644
1
3
2
VCC
RESET
GND
MAX810
Figure 4. MAX810 pin configuration.
MAX810 pin description
PIN SYMBOL DESCRIPTION
1 GND Device ground.
2 RESET Active-HIGH reset signal.
3 VCC Supply voltage input.
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 4
MAXIMUM RATINGS
SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
VCC Supply voltage –0.3 6.0 V
Vi(RESET)Input voltage at RESET pin (MAX809) –0.3 VCC + 0.3 V
Vi(RESET) Input voltage at RESET pin (MAX810) –0.3 VCC + 0.3 V
Ii(VCC) Input current at VCC pin – 20 mA
IoOutput current – 20 mA
Rate of rise at VCC – 100 V/µs
Tamb Ambient temperature –40 +105 °C
Tstg Storage temperature –65 +150 °C
PPower dissipation Derate 4 mW/°C above Tamb = 70 °C – 320 mW
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 5
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 CONDITIONS MIN. TYP. MAX. UNIT
VCC range Tamb = 0 °C to +70 °C 1.0 – 5.5 V
Tamb = –40 °C to +105 °C 1.2 – 5.5 V
ICC Supply current (SOT23-3) MAX809J/L/M
MAX810J/L/M VCC < 5.5 V ;
Tamb = –40 °C to +85 °C– 24 60 µA
MAX809R/S/T/Z
MAX810R/S/T/Z VCC < 3.6 V ;
Tamb = –40 °C to +85 °C– 17 50 µA
MAX809J/L/M
MAX810J/L/M VCC < 5.5 V ;
Tamb = +85 °C to +105 °C– – 100 µA
MAX809R/S/T/Z
MAX810R/S/T/Z VCC < 3.6 V ;
Tamb = +85 °C to +105 °C– – 100 µA
ICC Supply current (SC70-3) MAX809J/L/M
MAX810J/L/M VCC < 5.5 V ;
Tamb = –40 °C to +85 °C– 24 35 µA
MAX809R/S/T/Z
MAX810R/S/T/Z VCC < 3.6 V ;
Tamb = –40 °C to +85 °C– 17 30 µA
MAX809J/L/M
MAX810J/L/M VCC < 5.5 V ;
Tamb = +85 °C to +105 °C– – 60 µA
MAX809R/S/T/Z
MAX810R/S/T/Z VCC < 3.6 V ;
Tamb = +85 °C to +105 °C– – 60 µA
Vth RESET threshold voltage
(SOT23 3 d SC70 3)
MAX809Z
MAX810Z
Tamb = +25 °C 2.28 2.32 2.35 V
(SOT23-3 and SC70-3) MAX810Z Tamb = –40 °C to +85 °C 2.25 – 2.38 V
Tamb = +85 °C to +105 °C 2.22 – 2.42 V
MAX809R
MAX810R
Tamb = +25 °C 2.59 2.63 2.66 V
MAX810R Tamb = –40 °C to +85 °C 2.55 – 2.70 V
Tamb = +85 °C to +105 °C 2.50 – 2.76 V
MAX809S
MAX810S
Tamb = +25 °C 2.89 2.93 2.96 V
MAX810S Tamb = –40 °C to +85 °C 2.85 – 3.00 V
Tamb = +85 °C to +105 °C 2.78 – 3.08 V
MAX809T
MAX810T
Tamb = +25 °C 3.04 3.08 3.11 V
MAX810T Tamb = –40 °C to +85 °C 3.00 – 3.15 V
Tamb = +85 °C to +105 °C 2.92 – 3.23 V
MAX809J
MAX810J
Tamb = +25 °C 3.93 4.00 4.06 V
MAX810J Tamb = –40 °C to +85 °C 3.89 – 4.10 V
Tamb = +85 °C to +105 °C 3.80 – 4.20 V
MAX809M
MAX810M
Tamb = +25 °C 4.31 4.38 4.45 V
MAX810M Tamb = –40 °C to +85 °C 4.25 – 4.50 V
Tamb = +85 °C to +105 °C 4.16 – 4.56 V
MAX809L
MAX810L
Tamb = +25 °C 4.56 4.63 4.70 V
MAX810L Tamb = –40 °C to +85 °C 4.50 – 4.75 V
Tamb = +85 °C to +105 °C 4.40 – 4.86 V
Reset threshold temperature
coefficient – 30 – ppm/°C
VCC to RESET delay VCC = Vth to (Vth – 100 mV) – 20 – µs
RESET active time-out period
(SOT23 3)
Tamb = –40 °C to +85 °C 140 240 560 ms
(SOT23-3) Tamb = +85 °C to +105 °C 100 – 840 ms
RESET active time-out period
(SC70 3)
Tamb = –40 °C to +85 °C 140 240 460 ms
(SC70-3) Tamb = +85 °C to +105 °C 100 – 840 ms
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 6
SYMBOL UNITMAX.TYP.MIN.CONDITIONSPARAMETER
VOL(RESET)LOW-level output voltage
RESET i
MAX809R/S/T/Z VCC > Vth(min); Isink = 1.2 mA – – 0.3 V
()
on RESET pin MAX809J/L/M VCC > Vth(min); Isink = 3.2 mA – – 0.4 V
MAX809 VCC > 1.0 V ; Isink = 50 µA – – 0.3 V
VOH(RESET)HIGH-level output voltage
RESET i
MAX809R/S/T/Z VCC > Vth(max); Isource = 500 µA 0.8 × VCC – – V
()
on RESET pin MAX809J/L/M VCC > Vth(max); Isource = 800 µA VCC – 1.5 – – V
VOL(RESET) LOW -level output voltage
RESET i
MAX810R/S/T/Z VCC > Vth(max); Isink = 1.2 mA – – 0.3 V
()
on RESET pin MAX810J/L/M VCC > Vth(max); Isink = 3.2 mA – – 0.4 V
VOH(RESET) HIGH-level output voltage
on RESET pin MAX810 1.8 V < VCC > Vth(min);
Isource = 150 µA0.8 × VCC – – V
NOTES:
1. Production testing done at Tamb = +25 °C; limits over temperature guaranteed by design.
2. RESET output for MAX809; RESET output for MAX810.
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 7
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.
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 µs 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.
SL01728
RESET COMPARATOR OVERDRIVE, Vth – VCC (mV)
MAXIMUM TRANSIENT DURATION ( s)µ
0
50
100
150
200
250
300
350
400
450
1 10 100 1000
MAX809/
MAX810R/S/T/Z
MAX809/MAX810J/L/M
Figure 5. Maximum transient duration without causing a
reset pulse versus reset comparator overdrive.
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
relatively large resistor from RESET to ground as shown in Figure 6.
100 kΩ 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 kΩ pull-up resistor is recommended
for MAX810 if RESET is required to remain valid for VCC < 1 V.
VCC VCC
VCC
GND GND
RESET RESET
SL01726
MAX809 MICROPROCESSOR
100 kΩ
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 kΩ
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
GND GND
SL01727
MAX809 MOTOROLA
68HCxx
4.7 kΩRESET
RESET
Figure 7. Interfacing to microprocessor with bi-directional
reset I/O
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 8
PACKING METHOD
The MAX809 and MAX810 are packed in reels, as shown in Figure 8.
SL01305
TAPE DETAIL
COVER TAPE
CARRIER TAPE
REEL
AS-
SEMBLY
TAPE
GUAR
D
BAND
BAR-
CODE
LABEL
BOX
Figure 8. Tape and reel packing method.
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 9
SOT23-3: plastic small outline package; 3 leads; body width 1.5 mm
1.35 1.2
1.0 0.025 0.55
0.41 0.22
0.08 3.00
2.70 1.70
1.50 0.55
0.35
2
3
1
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 10
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
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 11
REVISION HISTORY
Rev Date Description
_2 20021021 Product data; second version. Supersedes MAX809_MAX810_1 of 2002 June 20 (9397 750 10213).
Engineering Change Notice 853–2355 29047 (date: 20021014).
Modifications:
•Add SC70-3 package.
•Maximum ratings table: from Topr operating temperature to Tamb ambient temperature.
_1 20020620 Product data; initial version.
Engineering Change Notice 853–2355 28505 (date: 20020620).
Philips Semiconductors Product data
MAX809/MAX8103-pin microprocessor resets
2002 Oct 21 12
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
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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
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Koninklijke Philips Electronics N.V. 2002
All rights reserved. Printed in U.S.A.
Date of release: 10-02
Document order number: 9397 750 10584
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Objective data
Preliminary data
Product data
Product
status[2] [3]
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Qualification
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Definitions
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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).
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[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.
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