ADM8690ARN Analog Devices Inc, ADM8690ARN Datasheet
ADM8690ARN
Specifications of ADM8690ARN
Related parts for ADM8690ARN
ADM8690ARN Summary of contents
Page 1
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 FEATURES Upgrade for ADM690 to ADM695, MAX690 to MAX695 Specified over temperature Low power consumption (0.7 mW) Precision voltage monitor Reset assertion down Low switch on resistance 0.7 Ω normal, 7 Ω in backup ...
Page 2
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Product Highlights ........................................................................... 1 Functional Block Diagrams............................................................. 1 Revision History ............................................................................... 2 General Description ......................................................................... 3 Specifications..................................................................................... 4 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configurations and Function Descriptions ........................... ...
Page 3
GENERAL DESCRIPTION The ADM869x family of supervisory circuits offers complete single- chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include microprocessor reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power ...
Page 4
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 SPECIFICATIONS V = full operating range 2 BATT Table 2. Parameter BATTERY BACKUP SWITCHING V Operating Voltage Range CC ADM8690, ADM8691, ADM8694, ADM8695 ADM8692, ADM8693 V Operating Voltage Range BATT ADM8690, ADM8691, ADM8694, ADM8695 ...
Page 5
Parameter POWER-FAIL DETECTOR PFI Input Threshold PFI Input Current PFO Output Voltage PFO Short-Circuit Source Current PFO Short-Circuit Sink Current CHIP ENABLE GATING CE Threshold IN CE Pull-Up Current IN CE Output Voltage OUT CE Propagation Delay OSCILLATOR OSC IN ...
Page 6
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. A Table 3. Parameter BATT All Other Inputs Input Current BATT GND Digital Output Current Power Dissipation, N-8 PDIP θ Thermal Impedance JA Power ...
Page 7
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS OUT ADM8690/ ADM8692 ADM8694 3 GND 6 TOP VIEW (Not to Scale) 5 PFO PFI 4 Figure 3. ADM8690, ADM8692, and ADM8694 Pin Configuration Table 4. Pin Function ...
Page 8
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 TYPICAL PERFORMANCE CHARACTERISTICS 5.00 4.99 4.98 4.97 4.96 4.95 4. (mA) OUT Figure 5. V vs. I Normal Operation OUT OUT 2.800 2.798 2.796 2.794 2.792 2.790 2.788 2.786 150 250 350 ...
Page 9
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 6 PFI PFI PFO 2 1.3V 30pF 1 0 PFO 1.35 1.25 0 0.1 0.2 0.3 0.4 0.5 0.6 TIME (µs) Figure 11. Power-Fail Comparator Response Time Falling ...
Page 10
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 CIRCUIT INFORMATION BATTERY SWITCHOVER SECTION The battery switchover circuit compares V and connects V to whichever is higher. Switchover occurs OUT when higher than BATT greater than V ...
Page 11
In addition to RESET , the ADM8691/ADM8693/ADM8695 contain an active high RESET output. This is the complement of RESET and is intended for processors requiring an active high reset signal. WATCHDOG TIMER RESET The watchdog timer circuit monitors the activity ...
Page 12
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 On the ADM8690/ADM8692 the watchdog timeout period is fixed at 1.6 seconds and the reset pulse width is fixed at 50 ms. On the ADM8694 the watchdog timeout period is also 1.6 seconds but the reset pulse width is ...
Page 13
POWER-FAIL WARNING COMPARATOR An additional comparator is provided for early warning of failure in the microprocessor power supply. The power-fail input (PFI) is compared to an internal 1.3 V reference. The power-fail output ( PFO ) goes low when the ...
Page 14
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 APPLICATION INFORMATION INCREASING THE DRIVE CURRENT If the continuous output current requirements at V 100 mA lower V – V voltage differential is desired, CC OUT an external PNP pass transistor can be connected in parallel ...
Page 15
ALTERNATE WATCHDOG INPUT DRIVE CIRCUITS The watchdog feature can be enabled and disabled under program control by driving WDI with a three-state buffer (see Figure 28). When three-stated, the WDI input floats, thereby disabling the watchdog timer. WATCHDOG WDI STROBE ...
Page 16
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 TYPICAL APPLICATIONS ADM8690, ADM8692, AND ADM8694 Figure 30 shows the ADM8690/ADM8692/ADM8694 in a typical power monitoring, battery backup application. V powers the CMOS RAM. Under normal operating conditions with V present internally connected OUT ...
Page 17
ADM8695) to allow for this oscillator start-up time different reset pulse width is required, a capacitor should be connected to OSC IN external clock can be used. Refer to Table 5 and ...
Page 18
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 OUTLINE DIMENSIONS 0.400 (10.16) 0.365 (9.27) 0.355 (9.02 0.280 (7.11) 0.250 (6.35) 1 0.240 (6.10) 4 PIN 1 0.100 (2.54) BSC 0.060 (1.52) 0.210 MAX (5.33) MAX 0.015 0.150 (3.81) (0.38) 0.015 (0.38) MIN 0.130 (3.30) GAUGE ...
Page 19
... ADM8690AN −40°C to +85°C 1 ADM8690ANZ −40°C to +85°C ADM8690ARN −40°C to +85°C ADM8690ARN-REEL −40°C to +85°C 1 ADM8690ARNZ −40°C to +85°C ADM8691AN −40°C to +85°C 1 ADM8691ANZ −40°C to +85°C ADM8691ARN −40°C to +85°C ADM8691ARN-REEL − ...
Page 20
ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695 Model Temperature Range ADM8694AN −40°C to +85°C 1 ADM8694ANZ −40°C to +85°C ADM8694ARN −40°C to +85°C ADM8694ARN-REEL −40°C to +85°C ADM8694ARNZ 1 −40°C to +85°C ADM8695ARW −40°C to +85°C ADM8695ARW-REEL −40°C to +85°C 1 ADM8695ARWZ −40°C to +85°C 1 ...