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AS1907C18-T Datasheet(PDF) 1 Page - ams AG |
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AS1907C18-T Datasheet(HTML) 1 Page - ams AG |
1 / 10 page AS1907, AS1908 , AS1909 Low-Vo ltage Microprocessor Reset Circuits www.austriamicrosystems.com Revision 1.02 1 - 10 Dat a Sh eet 1 General Description The AS1907/AS1908/AS1909 microprocessor supervi- sory circuits are ideal for monitoring the supply voltage of digital systems and microprocessors. The devices are designed to initiate a reset if the supply voltage goes below a predefined threshold. The duration of the reset is either 1.5, 30, or 150ms (typ.) after the supply voltage has risen above the pre-set threshold (see Ordering Information on page 9). The devices are available as the standard products listed in Table 1. The reset thresholds are factory-set between 1.6 and 2.5V in steps of approximately 100mV (see Table 5 on page 7). The devices exhibit excellent reliability, and can reduce system costs by eliminating the need for external com- ponents. The extremely low current consumption makes the devices ideal for use in portable applications. The integrated reset comparator was specifically designed to ignore fast transients on VCC. The devices are available in a 3-pin SOT23 package. Figure 1. Application Diagrams 2 Key Features ! 3 Output Types: Push/Pull RESET, Push Pull RESETN, and Open Drain RESETN ! Reset Threshold Range: 1.6 to 2.5V (~100mV incre- ments) ! RESET/RESETN: - Valid to VCC = 0.7V (AS1907 and AS1908) - Valid to VCC = 1.0V (AS1909) ! Reset Pulse Widths: 1, 20, and 100ms ! Supply Voltage Range: +0.7 to +3.6V ! Supply Current Range: 2.6 to 7.0µA ! Power Supply Transient Immunity ! Requires No External Components ! Operating Temperature Range: -40 to +125ºC ! 3-pin SOT23 Package 3 Applications The devices are ideal for use in cordless and mobile phones, MP3 players, CD and DVD players, PDAs, handheld computers, digital cameras, hard drives, and any other application where power supply supervisory control is required. Table 1. Standard Products Model Output Type Reset Type AS1907 Push/Pull Active-Low AS1908 Push/Pull Active-High AS1909 Open-Drain Active-Low 2 RESET AS1908 Micro- processor VCC VCC GND 1 VCC 3 VCC 3 RESET I/O RESETN 2 AS1907 GND 1 VCC 3 GND 1 Micro- processor VCC 3 RESET I/O GND 1 2 RESETN AS1909 Micro- processor VCC GND 1 VCC 3 VCC 3 RESET I/O GND 1 |
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