AS1909C188-T
AS1909C188-T Datasheet
AS1907, AS1908 , AS1909
| Part | Datasheet |
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AS1909C188-T |
AS1909C188-T (pdf) |
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| AS1907, AS1908 , AS1909 Low-Voltage Microprocessor Reset Circuits 1 General Description The AS1907/AS1908/AS1909 microprocessor supervisory 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 30, or 150ms typ. after the supply voltage has risen above the preset threshold see Ordering Information on page The devices are available as the standard products listed in Table Table Standard Products Model Output Type Reset Type AS1907 Push/Pull Active-Low AS1908 Push/Pull Active-High AS1909 Open-Drain Active-Low The reset thresholds are factory-set between and 2.5V in steps of approximately 100mV see Table 5 on page The devices exhibit excellent reliability, and can reduce system costs by eliminating the need for external components. 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. 2 Key Features Output Types Push/Pull RESET, Push Pull RESETN, and Open Drain RESETN Threshold Range to 2.5V ~100mV increments - Valid to VCC = 0.7V AS1907 and AS1908 - Valid to VCC = 1.0V AS1909 Pulse Widths 1, 20, and 100ms Voltage Range to +3.6V Current Range to 7.0µA Supply Transient Immunity No External Components Temperature Range -40 to +125ºC 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. Figure Application Diagrams VCC 3 VCC 3 AS1907 RESETN 2 Microprocessor RESET I/O VCC 3 VCC 3 AS1908 2 RESET Microprocessor RESET I/O VCC 3 VCC 3 Datasheet - Ordering Information 10 Ordering Information The devices are available as the standard products shown in Table Ordering Information Ordering Code Marking Reset Type Reset Threshold AS1908C18-T ASHU Active High 1.8V AS1908C20-T ASHV Active High 2.0V Minimum Reset Timeout 100ms Delivery Form Tape and Reel Tape and Reel AS1907C16-T ASHP Active Low 1.6V 100ms Tape and Reel AS1907C18-T ASHQ Active Low 1.8V 100ms Tape and Reel AS1907C20-T ASHR Active Low 2.0V 100ms Tape and Reel AS1907C22-T ASNB Active Low 2.2V 100ms Tape and Reel AS1907B23-T ASHX |
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