ADM708 Analog Devices, ADM708 Datasheet
ADM708
Specifications of ADM708
Available stocks
Related parts for ADM708
ADM708 Summary of contents
Page 1
... Debounced manual reset input ( MR ) Independent watchdog timer 1.6 second timeout (ADM706x) Reset output Active high (ADM706P) Active low (ADM706R, ADM706S, ADM706T) Both active high and active low (ADM708R, ADM708S, ADM708T) Voltage monitor for power-fail or low battery warning Guaranteed RESET valid with ...
Page 2
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 Functional Block Diagrams ............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 ESD Caution .................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Typical Performance Characteristics ............................................. 8 Circuit Information ........................................................................ 10 REVISION HISTORY 5/08—Rev Rev. C Changes to Applications Section .................................................... 1 Changes to Table 2 ............................................................................ 5 Changes to Table 3 ............................................................................ 6 Changes to Figure 8 ...
Page 3
... RESET OUTPUT VOLTAGE (ADM70xR/ADM70xS/ADM70xT RESET OUTPUT VOLTAGE (ADM706P RESET OUTPUT VOLTAGE (ADM708x WATCHDOG INPUT (ADM706x) Watchdog Timeout Period WDI Pulse Width WDI Input Threshold ...
Page 4
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T Parameter MANUAL RESET INPUT MR Pull-Up Current ( Pulse Width MR INPUT THRESHOLD RESET OUTPUT DELAY POWER-FAIL INPUT PFI Input Threshold PFI Input Current PFO OUTPUT VOLTAGE Min Typ Max Unit ...
Page 5
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T ABSOLUTE MAXIMUM RATINGS T = 25°C unless otherwise noted. A Table 2. Parameter V CC All Other Inputs Input Current V CC GND Digital Output Current Power Dissipation, N-8 (PDIP) θ Thermal Impedance JA Power Dissipation, R-8 (SOIC) θ Thermal Impedance JA Operating Temperature Range Industrial (Version A) Lead Temperature (Soldering, 10 sec) ...
Page 6
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS GND 3 PFI 4 Table 3. Pin Function Descriptions ADM706P/ADM706R/ADM706S/ADM706T Pin No. Mnemonic GND 4 PFI 5 PFO 6 WDI 7 (ADM706R/ADM706S/ RESET ADM706T Only) 7 (ADM706P Only) RESET 8 WDO WDO ADM706P RESET WDI GND ...
Page 7
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T Table 4. Pin Function Descriptions ADM708R/ADM708S/ADM708T Pin No. Mnemonic Description 1 MR Manual Reset Input. When taken below 0 RESET/RESET is generated. MR can be driven from TTL, CMOS logic, or from a manual reset switch because it is internally debounced. An internal 70 μA pull-up current holds the input high when floating. ...
Page 8
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T TYPICAL PERFORMANCE CHARACTERISTICS V CC RESET 400ms/DIV Figure 6. ADM70xR/ADM70xS/ADM70xT RESET Output Voltage vs. Supply Voltage V CC RESET 400ms/DIV Figure 7. RESET Output Voltage vs. Supply Voltage 1.3V PFI 3V 500ns/DIV Figure 8. PFI Assertion Response Time 1.2V PFO 3. 25° 1.2V PFO 0V 0V Rev Page ...
Page 9
... ADM706P/ADM706R/ADM706S/ADM RESET 2µs/DIV Figure 12. ADM70xR/ADM70xS/ADM70xT RESET Response Time 706T, ADM708R/ADM708S/ADM708T T = 25° Rev Page ...
Page 10
... ADM708T POWER-FAIL INPUT (PFI) 1.25V * VOLTAGE REFERENCE = 2.63V (R), 2.93V (S), 3.08V (T) Figure 14. ADM708 Functional Block Diagram POWER-FAIL RESET The reset output provides a reset (RESET or RESET ) output signal to the microprocessor whenever the V the reset threshold. The actual reset threshold voltage is dependent on whether suffix device is used. An internal timer holds the reset output active for 200 ms after the voltage on V rises above the threshold ...
Page 11
... MID VALID RESET BELOW The ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ ADM708T are guaranteed to provide a valid reset level with V Figure low Refer to the Typical Performance Characteristics section have sufficient drive to hold the voltage on RESET is no longer held pull-down resistor, as shown in be connected externally to hold the line low required ...
Page 12
... ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ ADM708T RESET output pin and the microprocessor reset pin. This limits the current to a safe level if there are conflicting output reset levels. A suitable resistor value is 4.7 kΩ. If the reset output is required for other uses, it should be buffered as shown in +3V/+3 ...
Page 13
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T OUTLINE DIMENSIONS 0.210 (5.33) MAX 0.150 (3.81) 0.130 (3.30) 0.115 (2.92) 0.022 (0.56) 0.018 (0.46) 0.014 (0.36) CONTROLLING DIMENSIONS ARE IN INCHES; MILLIMETER DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. CORNER LEADS MAY BE CONFIGURED AS WHOLE OR HALF LEADS. 0.25 (0.0098) ...
Page 14
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T ORDERING GUIDE Model Temperature Range ADM706PAN −40°C to +85°C 1 ADM706PANZ −40°C to +85°C ADM706PAR −40°C to +85°C ADM706PAR-REEL −40°C to +85°C 1 ADM706PARZ −40°C to +85°C 1 ADM706PARZ-REEL −40°C to +85°C ADM706RAN −40°C to +85°C ...
Page 15
... ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T NOTES Rev Page ...
Page 16
... ADM706P/ADM706R/ADM706S/ADM706T , ADM708R/ADM708S/ADM708T NOTES ©1995–2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06435-0-5/08(C) Rev Page ...