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ADM8690

Analog Devices
Part Number ADM8690
Manufacturer Analog Devices
Description Microprocessor Supervisory Circuits
Published Mar 23, 2005
Detailed Description Microprocessor Supervisory Circuits ADM8690/ADM8691/ADM8692/ADM8693/ADM8695 00093-001 FEATURES Upgrade for ADM690 to A...
Datasheet PDF File ADM8690 PDF File

ADM8690
ADM8690

Overview
Microprocessor Supervisory Circuits ADM8690/ADM8691/ADM8692/ADM8693/ADM8695 00093-001 FEATURES Upgrade for ADM690 to ADM695, MAX690 to MAX695 Specified over temperature Low power consumption (0.
7 mW) Precision voltage monitor Reset assertion down to 1 V VCC Low switch on resistance 0.
7 Ω normal, 7 Ω in backup High current drive (100 mA) Watchdog timer: 100 ms, 1.
6 s, or adjustable 400 nA standby current Automatic battery backup power switching Extremely fast gating of chip enable signals (3 ns) Voltage monitor for power fail Available in TSSOP package APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Automotive systems PRODUCT HIGHLIGHTS The ADM8690 and ADM8692 are available in 8-lead, PDIP packages and provide: 1.
Power-on reset output during power-up, power-down, and brownout conditions.
The RESET output remains operational with VCC as low as 1 V.
2.
Battery backup switching for CMOS RAM, CMOS microprocessor, or other low power logic.
3.
A reset pulse if the optional watchdog timer has not been toggled within a specified time.
4.
A 1.
3 V threshold detector for power-fail warning, low battery detection, or to monitor a power supply other than 5 V.
The ADM8691, ADM8693, and ADM8695 are available in 16-lead PDIP and small outline packages (including TSSOP) and provide three additional functions: 1.
Write protection of CMOS RAM or EEPROM.
2.
Adjustable reset and watchdog timeout periods.
3.
Separate watchdog timeout, backup battery switchover, and low VCC status outputs.
FUNCTIONAL BLOCK DIAGRAMS VBATT VCC 4.
65V1 RESET GENERATOR2 VOUT RESET WATCHDOG INPUT (WDI) POWER FAIL INPUT (PFI) WATCHDOG TRANSITION DETECTOR (1.
6s) ADM8690/ ADM8692 1.
3V POWER FAIL OUTPUT (PFO) 1VOLTAGE DETECTOR = 4.
65V (ADM8690) 4.
40V (ADM8692) 2RESET PULSE WIDTH = 50ms (AD8690, ADM8692) Figure 1.
ADM8690/ADM8692 VBATT BATT ON ADM8691/ ADM8693/ ADM8695 VOUT VCC CEIN 4.
65V1 OSC IN OSC SEL RESET AND WATCHDOG TIME BASE RESET GENERATOR CEOUT LOW LIN...


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