MAX809
Very Low Supply Current
3-Pin Microprocessor
Reset Monitors
The MAX809 is a cost–effective system supervisor circuit designed
to monitor VCC in digital systems and provide a reset signal to the host
processor when necessary. No external components are required.
The reset output is driven active within 10 µsec of VCC falling
through the reset voltage threshold. Reset is maintained active for a
minimum of 140 msec after VCC rises above the reset threshold. The
MAX809 has an active–low RESET output. The output of the
MAX809 is guaranteed valid down to VCC = 1.0 V. This device is
available in a SOT–23 package.
http://onsemi.com
MARKING
DIAGRAM
3
3
SOT–23
(TO–236)
CASE 318
xxxM
2
1
2
1
The MAX809 is optimized to reject fast transient glitches on the VCC
line. Low supply current of 1.0 µA (VCC = 3.2 V) make this device
suitable for battery powered applications.
xxx = Specific Device Code
= Monthly Date Code
M
Features
• Precision VCC Monitor for 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies
• Precision Monitoring Voltages from 1.6 V to 4.9 V Available
in 100 mV Steps
PIN CONFIGURATION
1
GND
• 140 msec Guaranteed Minimum RESET Output Duration
• RESET Output Guaranteed to VCC = 1.0 V
• Low 1.0 µA Supply Current
V
CC
3
• VCC Transient Immunity
• Small SOT–23 Package
RESET
2
• No External Components
• Wide Operating Temperature: –40°C to 105°C
SOT–23*
(Top View)
Typical Applications
NOTE: *SOT–23 is equivalent to JEDEC (TO–236)
• Computers
• Embedded Systems
• Battery Powered Equipment
• Critical µP Power Supply Monitoring
ORDERING INFORMATION
Device
Package
Shipping
MAX809xTR
SOT–23 3000/Tape & Reel
V
CC
MAX809SNxxxT1 SOT–23 3000/Tape & Reel
V
CC
V
CC
PROCESSOR
NOTE: The “x” and “xxx” denotes a suffix for V voltage
cc
threshold options – see page 6 for more details.
MAX809
RESET
RESET
INPUT
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 6 of this data sheet.
GND
GND
Figure 1. Typical Application Diagram
Semiconductor Components Industries, LLC, 2001
1
Publication Order Number:
February, 2001 – Rev. 6
MAX809/D