ADM694 Analog Devices, ADM694 Datasheet
ADM694
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ADM694 Summary of contents
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... CMOS RAM write protection, and power failure warn- ing. The complete family provides a variety of configurations to satisfy most microprocessor system requirements. The ADM690, ADM692 and ADM694 are available in 8-pin DIP packages and provide: 1. Power-on reset output during power-up, power-down and brownout conditions. The RESET output remains opera- tional with V as low ...
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... BATT Battery Switchover Hysteresis BATT ON Output Voltage BATT ON Output Short Circuit Current RESET AND WATCHDOG TIMER Reset Voltage Threshold ADM690, ADM691, ADM694, ADM695 ADM692, ADM693 Reset Threshold Hysteresis Reset Timeout Delay ADM690, ADM691, ADM692, ADM693 ADM694, ADM695 Watchdog Timeout Period, Internal Oscillator ...
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... OUT ADM690SQ ADM691AN ADM691AR ADM691AQ ADM691SQ ADM692AN ADM692AQ ADM692SQ ADM693AN ADM693AR ADM693AQ ADM693SQ ADM694AN ADM694AQ ADM694SQ ADM695AN ADM695AR ADM695AQ ADM695SQ –3– ADM690–ADM695 Test Conditions/Comments OSC SEL = 0 V OSC SEL = OSC ORDERING GUIDE Temperature Range Package Option – +85 C N-8 – ...
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... CC BATT 3. The watchdog timer is not serviced within its timeout period. The reset threshold is typically 4.65 V for the ADM690/ADM691/ADM694/ADM695 and 4.4 V for the ADM692 and ADM693. RESET remains low for 50 ms (ADM690/ADM691/ADM692/ADM693) or 200 ms (ADM694/ADM695) after V returns above the threshold. RESET also goes low for 50 (200 the watchdog timer is enabled but not CC serviced within its timeout period ...
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... CMOS RAM or other low power CMOS circuitry. The supply current in battery back up is typically 0.6 A. The ADM690/ADM691/ADM694/ADM695 operates with battery voltages from 2 4.25 V and the ADM692/ADM693 operates with battery voltages from 2 4.0 V. High value capacitors, either standard electrolytic or the farad size double layer capacitors, can also be used for short-term memory back up ...
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... The guaranteed minimum and maximum thresholds of the ADM690/ADM691/ADM694/ADM695 are 4.5 V and 4.73 V, while the guaranteed thresholds of the ADM692/ADM693 are 4.25 V and 4.48 V. The ADM690/ADM691/ADM694/ADM695 is, therefore, compatible with 5 V supplies with a +10%, –5% tolerance while the ADM692/ADM693 is compatible with 5 V 10% supplies. The reset threshold comparator has approxi- mately hysteresis ...
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... The watchdog timeout period is fixed at 1.6 seconds, and the reset pulse width is fixed the ADM690/ADM692. On the ADM694 the watchdog timeout period is also 1.6 sec- onds but the reset pulse width is fixed at 200 ms. The ADM691/ ADM693/ADM695 allow these times to be adjusted as shown in Table I ...
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ADM690–ADM695 CE Gating and RAM Write Protection (ADM691/ADM693/ ADM695) The ADM691/ADM693/ADM695 products include memory protection circuitry which ensures the integrity of data in mem- ory by preventing write operations when V level. There are two additional pins, CE may be ...
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... Figure 15. Power Fail Comparator Response Time –9– A4 3.36 V 100 500ms Figure 10. Reset Output Voltage vs. Supply Voltage 4. +5V CC 4.68 POWER-UP ADM690 ADM691 4.66 ADM694 ADM695 4.64 POWER-DOWN 4. 100 120 TEMPERATURE – C Figure 13. Reset Voltage Threshold vs. Temperature + ...
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ADM690–ADM695 +APPLICATION INFORMATION Increasing the Drive Current If the continuous output current requirements at V 100 lower V –V voltage differential is desired, CC OUT an external PNP pass transistor may be connected in parallel with ...
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INPUT POWER BATT 10M BATTERY ADM69x PFI 10M 20k OPTIONAL CE OUT TEST LOAD Figure 20. Monitoring the Battery Status Alternate Watchdog Input Drive Circuits The watchdog feature can be enabled and disabled under pro- gram ...
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... V falls below 4.65 V for the CC ADM690/ADM694 or 4.4 V for the ADM692. RESET will remain low for 50 ms (200 ms for ADM694) after The watchdog timer input (WDI) monitors an I/O line from the P system. This line must be toggled once every 1.6 seconds to verify correct software execution ...
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INPUT POWER +5V 0 BATT V OUT BATT OUT BATTERY R ADM691 ADM693 ADM695 PFI GND WDI OSC IN PFO OSC SEL RESET LOW LINE WDO SYSTEM ...
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ADM690–ADM695 0.210 (5.33) 0.200 (5.05) 0.125 (3.18) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Pin Plastic DIP (N- 0.280 (7.11) PIN 1 0.240 (6.10 0.325 (8.25) 0.430 (10.92) 0.300 (7.62) 0.348 (8.84) 0.060 (1.52) 0.210 ...
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SEATING 0.299 (7.60) REV. A 16-Lead Cerdip (Q-16 0.310 (7.87) PIN 1 0.220 (5.59 0.840 (21.34) MAX 0.060 (1.52) 0.015 (0.38) 0.200 (5.08) MAX 0.150 (3.81) MIN PLANE 0.022 (0.558) 0.100 (2.54) 0.070 (1.78) BSC 0.014 ...
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