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IMP1815 Datasheet(PDF) 11 Page - A1 PROs co., Ltd. |
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IMP1815 Datasheet(HTML) 11 Page - A1 PROs co., Ltd. |
11 / 36 page © 1999 IMP, Inc. 408-432-9100/www.impweb.com 1 Key Features Applications x Set-top boxes x Cellular phones x PDAs x Energy management systems x Embedded control systems x Printers x Single board computers x Improved Dallas DS1812 replacement — Over 50% lower maximum supply current x Low Supply Current — 20µA maximum (5.5V) x Automatically restarts a microprocessor after power failure x 150ms reset delay after VCC returns to an in-tolerance condition x Active HIGH power-up reset x Precision temperature-compensated voltage reference and comparator x Eliminates external components x Low-cost TO-92 package x Compact surface mount SOT-23 package x Push-Pull output for minimum current drain x Operating temperature –40 °C to +85°C Block Diagram – + 1812_01.eps VCC 1 RESET GND 3 2 Supply Tolerance Bias IMP1812 Delay 150ms Typical Reference IMP1 IMP1881122 POWER MANAGEMENT Lo Low P w Po ow wer er, 5V , 5V µ µP R P Reset eset – A – Activ ctive HIGH, Push-Pull Output e HIGH, Push-Pull Output The IMP1812 supply voltage monitor is an improved, low-power replacement for the Dallas Semiconductor DS1812. Maximum supply current over temperature is a low 20 µA, representing over 50 percent lower power as compared to the DS1812. The IMP1812 issues an active HIGH reset signal whenever the moni- tored supply is out-of-tolerance. A precision reference and comparator circuit monitor power supply (VCC) level. Tolerance level options are 5-, 10- and 15-percent. When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces an active HIGH reset signal. After VCC returns to an in-tolerance condition, the reset signal remains active for 150ms to allow the power supply and system micro- processor to stabilize. The IMP1812 is designed with a push-pull output stage and operates over the extended industrial temperature range. Devices are available in compact surface mount SOT-23 packages and 3-lead TO-92 packages. Other low power products in this family include the IMP1810/11/15/16/17, IMP1233D and IMP1233M. Typical Application IMP1812 Microprocessor RESET RESET 1812_02.eps VCC GND t r a P e g a t l o V T E S E R ) V ( e m i T T E S E R ) s m ( t u p t u O e g a t S T E S E R y t i r a l o P 0 1 8 1 P M I0 2 1 . 4 , 0 7 3 . 4 , 0 2 6 . 40 5 1ll u P - h s u PW O L 1 1 8 1 P M I0 3 1 . 4 , 0 5 3 . 4 , 0 2 6 . 40 5 1n i a r D - n e p OW O L 2 1 8 1 P M I0 3 1 . 4 , 0 5 3 . 4 , 0 2 6 . 40 5 1ll u P - h s u PH G I H 5 1 8 1 P M I0 5 5 . 2 , 0 8 8 . 2 , 0 6 0 . 30 5 1ll u P - h s u PW O L 6 1 8 1 P M I0 5 5 . 2 , 0 8 8 . 2 , 0 6 0 . 30 5 1n i a r D - n e p OW O L 7 1 8 1 P M I0 5 5 . 2 , 0 8 8 . 2 , 0 6 0 . 30 5 1ll u P - h s u PH G I H D 3 3 2 1 P M I5 2 1 . 4 , 5 7 3 . 4 , 5 2 6 . 40 5 3n i a r D - n e p OW O L M 3 3 2 1 P M I0 2 7 . 2 , 5 7 3 . 4 , 5 2 6 . 40 5 3n i a r D - n e p OW O L Family Selection Guide |
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