ADM695 Analog Devices, ADM695 Datasheet
ADM695
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ADM695 Summary of contents
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... A 1.3 V threshold detector for power fail warning, low battery detection monitor a power supply other than +5 V. The ADM691, ADM693 and ADM695 are available in 16-pin DIP and small outline packages and provide three additional functions. 1. Write protection of CMOS RAM or EEPROM. ...
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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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... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the ADM690–ADM695 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...
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... Table I and Figure 4). With OSC SEL high or floating, the internal oscillator is enabled and the reset active time is fixed typ. (ADM691/ADM693) or 200 ms typ (ADM695). In this mode the OSC IN pin selects between fast (100 ms) and slow (1.6 s) watchdog timeout periods. In both modes, the timeout period immediately after a reset is 1 ...
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... V to the V an external PNP pass transistor may be connected in parallel CC BATT with the internal transistor. The BATT ON output (ADM691 falls, and ADM693/ADM695) can directly drive the base of the external BATT rises. This transistor MOSFET switch connects the V during battery backup ...
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... V. This ensures that the CC microprocessor is held in a stable shutdown condition. This RESET active time is adjustable on the ADM691/ADM693/ ADM695 by using an external oscillator or by connecting an external capacitor to the OSC IN pin. Refer to Table I and Figure 4. The guaranteed minimum and maximum thresholds of the ADM690/ADM691/ADM694/ADM695 are 4 ...
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... Table I. ADM691, ADM693, ADM695 Reset Pulse Width and Watchdog Timeout Selections OSC SEL OSC IN Low External Clock Input Low External Capacitor Floating or High Low Floating or High Floating or High NOTE With the OSC SEL pin low, OSC IN can be driven by an external clock signal external capacitor can be connected between OSC IN and GND. The nominal internal oscillator frequency is 10 ...
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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 used to control the Chip Enable or Write inputs of CMOS RAM ...
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... + PFI PFO 2 1.3V 30pF 1 0 1.35 1.25 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 TIME – s Figure 14. Power Fail Comparator Response Time REV. A Typical Performance Curves–ADM690–ADM695 2. +2.8V BATT T = +25 C 2.79 A 2.78 SLOPE = 20 2.77 2.76 0 200 400 600 800 1000 I – A OUT Figure 9. V vs. I Battery OUT ...
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... 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 the internal transistor. The BATT ON output (ADM691/ ADM693/ADM695) can directly drive the base of the external transistor. PNP TRANSISTOR +5V INPUT 0.1 F POWER V ...
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... If a replacement time of 5 seconds is allowed and assuming 4.5 V and BATTERY Figure 22a. Preventing Spurious RESETS During Battery Replacement 2. A resistor from BATT replacement. –11– ADM690–ADM695 OSC SEL ADM69x D1 D2 OSC IN *LOW = INTERNAL TIMEOUT HIGH = EXTERNAL TIMEOUT BATT BATT , a reset pulse is generated GND ...
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... POWER V > 8V returns CC BATTERY Figure 23b. ADM690/ADM692/ADM694 Typical Application Circuit B ADM691, ADM693, ADM695 A typical connection for the ADM691/ADM693/ADM695 is shown in Figure 24. CMOS RAM is powered from power is present this is routed routed to V BATT V , but if more current is required, an external PNP transistor CC can be added ...
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... RESET output to hold the microprocessor’s Reset line low when V is below 4.65 V (4.4 V for ADM693). An internal CC timer holds RESET low for 50 ms (200 ms for the ADM695) after V rises above 4.65 V (4.4 V for ADM693). This prevents CC repeated toggling of RESET even if the 5 V power drops out and recovers with each power line cycle ...
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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 0.015 (0.38) (5.33) MAX 0.150 0.015 (0.381) 0.160 (4.06) (3.81) 0.008 (0.204) 0.115 (2.93) MIN SEATING 0.100 0.022 (0.558) 0.070 (1.77) PLANE (2 ...
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... 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 (0.356) 0.30 (0.76) 16-Lead SOIC (R-16 0.419 (10.65 0.030 (0.75) 0.413 (10.50) 0.012 (0.3) 0.104 (2.65) 0.05 (1.27) 0.019 (0.49) 0.013 REF (0.32) –15– ADM690–ADM695 0.320 (8.13) 0.290 (7.37) 0.015 (0.381) 0.008 (0.204) 0.042 (1.07) ...
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