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MAX795S Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX795S Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 20 page General Description The MAX793/MAX794/MAX795 microprocessor (µP) supervisory circuits monitor and control the activities of +3.0V/+3.3V µPs by providing backup-battery switchover, among other features such as low-line indication, µP reset, write protection for CMOS RAM, and a watchdog (see the Selector Guide below). The backup-battery volt- age can exceed VCC, permitting the use of 3.6V lithium batteries in systems using 3.0V to 3.3V for VCC. The MAX793/MAX795 offer a choice of reset threshold voltage range (denoted by suffix letter): 3.00V to 3.15V (T), 2.85V to 3.00V (S), and 2.55V to 2.70V (R). The MAX794’s reset threshold is set externally with a resistor divider. The MAX793/MAX794 are available in 16-pin DIP and narrow SO packages, and the MAX795 comes in 8-pin DIP and SO packages. ________________________Applications Battery-Powered Computers and Controllers Embedded Controllers Intelligent Controllers Critical µP Power Monitoring Portable Equipment ____________________________Features MAX793/MAX794/MAX795 o Precision Supply-Voltage Monitor: Fixed Reset Trip Voltage (MAX793/MAX795) Adjustable Reset Trip Voltage (MAX794) o Guaranteed Reset Assertion to VCC = 1V o Backup-Battery Power Switching—Battery Voltage Can Exceed VCC o On-Board Gating of Chip-Enable Signals—7ns Max Propagation Delay MAX793/MAX794 Only o Battery Freshness Seal o Battery OK Output (MAX793) o Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning o Independent Watchdog Timer (1.6s timeout) o Manual Reset Input 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits ________________________________________________________________ Maxim Integrated Products 1 MAX793 RESET LOWLINE WDI CE IN CE OUT 3.0V OR 3.3V +5V BATT A0-A15 MR +5V SUPPLY FAILURE BATT ON PFI WDO OUT CMOS RAM ADDRESS DECODER 0.1 µF PMOS 0.1 µF VCC PFO GND I/O µP NMI RESET VCC VCC 0.1 µF 3.6V BATT OK (OPTIONAL) Si9433DY SILICONIX 19-0366; Rev 6; 3/10 FEATURE Active-Low Reset Active-High Reset Programmable Reset Threshold Low-Line Early Warning Output MAX793 MAX794 MAX795 Backup-Battery Switchover External Switch Driver Power-Fail Comparator Battery OK Output _____________________Selector Guide __________Typical Operating Circuit Watchdog Input Battery Freshness Seal Manual Reset Input Chip-Enable Gating Pin-Package 16-DIP/SO 16-DIP/SO 8-DIP/SO Pin Configurations appear at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Ordering Information PART* TEMP RANGE PIN- PACKAGE MAX793_CPE 0°C to +70°C 16 Plastic DIP MAX793_CSE 0°C to +70°C 16 Narrow SO Ordering Information continued at end of data sheet. * The MAX793/MAX795 offer a choice of reset threshold voltage. Select the letter corresponding to the desired reset threshold voltage range (T = 3.00V to 3.15V, S = 2.85V to 3.00V, R = 2.55V to 2.70V) and insert it into the blank to complete the part number. The MAX794’s reset threshold is adjustable. Devices are available in both leaded and lead-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering. |
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