AZ809A_10 Datasheet, PDF (1/11 Pages) BCD Semiconductor Manufacturing Limited – 3-PIN MICROPROCESSOR RESET CIRCUIT

Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
General Description
Features
AZ809A
The AZ809A is a precision system supervisor and reset
circuit designed to monitor the power supplies in
microprocessor and digital system. It provides a reset
signal to the host processor during power-up, power-
down, and brownout conditions.
The AZ809A has an active-low RESET output, three
standard reset options are offered to support 5V, 3.3V,
and 3.0V system.Whenever the system supply voltage
declines below the internal fixed reset threshold, the
AZ809A asserts a reset signal and the reset signal
remains asserted for 240ms after V_CC rises above the
threshold.
· Precise Monitoring of 3.0V, 3.3V, and 5.0V Sup-
ply Voltages
· 140ms Minimum Reset Pulse Width
· Active-low RESET Output
· Push-Pull RESET Output
· No External Components
· Reset Valid Down to V_CC=1.0V
· Power Supply Fast Transient Immunity
· Specified Over Full Temperature Range: -40 to
105^oC
Applications
The AZ809A has a push-pull output, no external com-
ponents are required. The output is guaranteed to be in
·
Microprocessor Systems
the correct state at V_CC level as low as 1V. The
AZ809A is optimized to reject fast transient glitches
·
·
Portable/Battery-Powered Systems
Embedded Controllers
on the VCC line. When the V_CC is 3.3V, the supply ^{· Automotive}
current consumption is about 6µA typically.
· Intelligent Instruments
· Wireless Communication Systems
The IC is available in SOT-23 package.
· PDAs and Handheld Equipment
· Set-Top Boxes
· ADSL Modems
Oct. 2010 Rev. 1. 3
SOT-23
Figure 1. Package Type of AZ809A
BCD Semiconductor Manufacturing Limited
1