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Part: MAX708xD
Category:
Power Management
-> Supervisory Circuits
-> System Supervisors/Reset
-> Resets (single function)
Description: MAX708R/S/T; 3 V Microprocessor Supervisor Circuit With Power Fail Comparator And Manual Reset;; Package: SO8 (SO8)
Company: Philips Semiconductors
Datasheet: Download MAX708xD datasheet File size : 6567 kB
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Datasheet text preview:
INTEGRATED CIRCUITS
MAX708R/S/T 3 V microprocessor supervisor circuit with power fail comparator and manual reset
Product data Supersedes data of 2003 Feb 13 2003 Aug 08
Philips Semiconductors
Philips Semiconductors
Product data
3 V microprocessor supervisor circuit with power fail comparator and manual reset
MAX708R/S/T
DESCRIPTION
The MAX708R/S/T are microprocessor supervisory circuits used to monitor +3 V power supply levels in +3 V to +5 V microprocessor and other logic systems. The R, S, T suffixes have reset thresholds of 2.63 V, 2.93 V and 3.08 V, respectively. They reduce the number of circuit components, and improve reliability and accuracy compared to using separate ICs or discrete components. The MAX708R/S/T features make the MAX708R/S/T ideal for use in portable, battery operated equipment. The low supply current, typically 50 µA, minimizes battery load. Both RESET and RESET are active during power-up, power-down and brownout conditions An active-LOW manual reset input is also available. A 1.25 V threshold detector provides power-fail warning. This independent comparator can be used to monitor a second voltage supply and provide an early warning to the microprocessor that voltage is falling. This allows for an orderly shutdown, transmitting an alert to an operator, or activation of an alternate power source before the device asserts the reset signals. The device is available in the 8-pin SO package.
FEATURES
· RESET and RESET signals · Independent comparator with 1.25 V threshold for power failure or
low battery warning
APPLICATIONS
· Manual reset input · 50 µA quiescent current · Reset thresholds of 2.63, 2.93, and 3.08 V · Guaranteed RESET assertion to VCC = 1 V
SIMPLIFIED SYSTEM DIAGRAM
REGULATED DC SUPPLY (VCC) UNREGULATED DC SUPPLY
· Battery powered devices · Critical microprocessor monitoring · Controllers · Portable instruments
MICROPROCESSOR VCC RESET VCC
RESET
RESET INPUT
MAX708
R1 1% PFI R2 1% PUSH-BUTTON SWITCH PFO INTERRUPT
MR GND GND
SL01640
Figure 1. Simplified system diagram.
2003 Aug 08
2
Philips Semiconductors
Product data
3 V microprocessor supervisor circuit with power fail comparator and manual reset
MAX708R/S/T
ORDERING INFORMATION
TYPE NUMBER NUMBER MAX708xD PACKAGE NAME SO8 DESCRIPTION plastic small outline package; 8 leads (see dimensional drawing) TEMPERATURE RANGE 45 °C to +85 °C
NOTE: The device has 3 voltage output options, indicated by the `x' on the `Type number'. Part number MAX708RD MAX708SD MAX708TD Threshold Voltage (Typical) 2.63 V 2.93 V 3.08 V
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 MAX708RD MAX708SD MAX708TD Marking ANEx ANDx ANCx
PIN CONFIGURATION
TOP VIEW MR VCC GND PFI 1 2 8 7 RESET RESET NC PFO
PIN DESCRIPTION
PIN 1 SYMBOL MR DESCRIPTION Manual reset input (Active-LOW). Triggers a reset pulse when pulled below 0.6 V. Connect to VCC or leave floating if not used. Supply voltage input. Ground. Power fail comparator input. When PFI is less than 1.25 V, PFO goes LOW, otherwise PFO remains HIGH. Connect to ground if not used. Power fail comparator output (Active-LOW). When voltage at PFI is less than 1.25 V, PFO goes LOW and sinks current. Do not connect if not used. No connection. Active-LOW reset output. RESET is LOW if VCC is below the threshold voltage or if MR is held LOW. RESET is maintained for 200 ms after the reset conditions are terminated. Active-HIGH reset output. RESET is HIGH if VCC is below the threshold voltage or if MR is held LOW. RESET is maintained for 200 ms after the reset conditions are terminated.
SO8
3 4 6 5
2 3 4
VCC GND PFI
SL01639
Figure 2. Pin configuration. 5 PFO
6 7
NC RESET
8
RESET
MAXIMUM RATINGS
SYMBOL VCC Vn PARAMETER Supply voltage Other input pin voltage Input current at VCC or GND Output current, all outputs Rate of rise at VCC Tamb Tstg P Ambient temperature Storage temperature Power dissipation, SO8 package Tamb = 70 °C; Note 2 Note 1 CONDITIONS MIN. 0.3 0.3 40 65 MAX. 6.0 VCC + 0.3 20 20 100 +85 +160 470 UNIT V V mA mA V/µs °C °C mW
NOTES: 1. Input voltage limits on PFI and MR can be exceeded provided the input current is less than 10 mA. 2. Derate the dissipation 5.88 mW/°C above 70 °C.
2003 Aug 08
3
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