AS1908C20-T

AS1908C20-T Datasheet

AS1907, AS1908, AS1909

Part	Datasheet
AS1908C20-T	AS1908C20-T (pdf)

Related Parts	Information
AS1908C23-T	AS1908C23-T
AS1907C16-T	AS1907C16-T
AS1907C20-T	AS1907C20-T
AS1909C17-T	AS1909C17-T
AS1907C18-T	AS1907C18-T
AS1907B23-T	AS1907B23-T
AS1907C23-T	AS1907C23-T
AS1908C18-T	AS1908C18-T
AS1907C24-T	AS1907C24-T
AS1908C16-T	AS1908C16-T
AS1909C20-T	AS1909C20-T
AS1909C16-T	AS1909C16-T
AS1909C23-T	AS1909C23-T
AS1909C22-T	AS1909C22-T
AS1909C18-T	AS1909C18-T
AS1907C22-T	AS1907C22-T
AS1909C168-T	AS1909C168-T

PDF Datasheet Preview
Datasheet 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 pre-set 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 ! 3 Output Types Push/Pull RESET, Push Pull RESETN, and Open Drain RESETN ! Reset Threshold Range to 2.5V ~100mV increments ! 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 to +3.6V ! Supply Current Range 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. Figure Application Diagrams VCC 3 VCC 3 VCC 3 VCC 3 AS1907 RESETN 2 Microprocessor RESET I/O Datasheet - Ordering Information 10 Ordering Information The devices are available as the following standard products. 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 100ms Delivery Form Tape and Reel Tape and Reel AS1907C16-T AS1907C18-T AS1907C20-T AS1907C22-T AS1907B23-T ASHP ASHQ ASHR ASNB ASHX Active Low Active Low Active Low Active Low Active Low 1.6V 1.8V 2.0V 2.2V 2.3V 100ms 20ms Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel AS1909C16-T AS1909C168-T AS1909C17-T AS1909C18-T AS1909C20-T AS1909C22-T AS1909C23-T ASHY ASSB ASHZ ASND ASH1 ASNC ASH2 Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain 1.6V 1.68V 1.7V 1.8V 2.0V 2.2V 2.3V 100ms Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Non-standard versions require a minimum order of 30,000 units. Contact austriamicrosystems, AG for availability of non-standard versions. Note All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: For further information and requests, please contact us or find your local distributor at Table Coding of Factory-Trimmed Reset Active Time-Out Period Device Suffix tTP in Milliseconds AS1907xyy-T* AS1908xyy-T* AS1909xyy-T* * These devices are available in factory-set VCC reset thresholds from 1.6V to 2.5V, in approximately 100mV increments. Choose the desired reset threshold suffix from see Table 5 on page 7 and insert it instead of “yy” in the part number. Factory-programmed reset timeout periods are also available. Insert the code corresponding to the desired nominal reset timeout period see Table 7 instead of “x” in the part number. All devices available in tape-and-reel only. 9 - 10 AS1907/AS1908/AS1909 Datasheet

PDF Datasheet Preview

Datasheet

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 pre-set 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
! 3 Output Types Push/Pull RESET, Push Pull RESETN, and Open Drain RESETN
! Reset Threshold Range to 2.5V ~100mV increments
! 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 to +3.6V
! Supply Current Range 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.

Figure Application Diagrams

VCC 3

VCC 3

VCC 3

VCC 3

AS1907

RESETN 2

Microprocessor

RESET I/O
Datasheet - Ordering Information
10 Ordering Information

The devices are available as the following standard products.
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
100ms

Delivery Form

Tape and Reel Tape and Reel

AS1907C16-T AS1907C18-T AS1907C20-T AS1907C22-T AS1907B23-T

ASHP ASHQ ASHR ASNB ASHX

Active Low Active Low Active Low Active Low Active Low
1.6V 1.8V 2.0V 2.2V 2.3V
100ms 20ms

Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel

AS1909C16-T AS1909C168-T AS1909C17-T AS1909C18-T AS1909C20-T AS1909C22-T AS1909C23-T

ASHY ASSB ASHZ ASND ASH1 ASNC ASH2

Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain
1.6V 1.68V 1.7V 1.8V 2.0V 2.2V 2.3V
100ms

Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel

Non-standard versions require a minimum order of 30,000 units. Contact austriamicrosystems, AG for availability of non-standard versions.

Note All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect:

For further information and requests, please contact us or find your local distributor at

Table Coding of Factory-Trimmed Reset Active Time-Out Period

Device

Suffix
tTP in Milliseconds

AS1907xyy-T* AS1908xyy-T* AS1909xyy-T*
* These devices are available in factory-set VCC reset thresholds from 1.6V to 2.5V, in approximately 100mV increments. Choose the desired reset threshold suffix from see Table 5 on page 7 and insert it instead of “yy” in the part number.

Factory-programmed reset timeout periods are also available. Insert the code corresponding to the desired nominal reset timeout period see Table 7 instead of “x” in the part number. All devices available in tape-and-reel only.
9 - 10

AS1907/AS1908/AS1909

Datasheet

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Datasheet ID: AS1908C20-T 519666