19-2000; Rev 1; 1/99
Open-Drain SOT µP Reset Circuit
________________General Description
The MAX6315 low-power CMOS microprocessor (µP)
supervisory circuit is designed to monitor power sup-
plies in µP and digital systems. It provides excellent cir-
cuit reliability and low cost by eliminating external
components and adjustments. The MAX6315 also pro-
vides a debounced manual reset input.
This device performs a single function: it asserts a reset
signal whenever the V
CC
supply voltage falls below a
preset threshold or whenever manual reset is asserted.
Reset remains asserted for an internally programmed
interval (reset timeout period) after V
CC
has risen above
the reset threshold or manual reset is deasserted. The
MAX6315’s open-drain
RESET
output can be pulled up
to a voltage higher than V
CC
.
The MAX6315 comes with factory-trimmed reset thresh-
old voltages in 100mV increments from 2.5V to 5V.
Preset timeout periods of 1ms, 20ms, 140ms, and
1120ms (minimum) are also available. The device
comes in a SOT143 package.
For microcontrollers (µCs) and µPs with bidirectional
reset pins, see the MAX6314 data sheet.
____________________________Features
o
Small SOT143 Package
o
Open-Drain
RESET
Output Can Exceed V
CC
o
Precision, Factory-Set V
CC
Reset Thresholds:
100mV Increments from 2.5V to 5V
o
±1.8% Reset Threshold Accuracy at T
A
= +25°C
o
±2.5% Reset Threshold Accuracy Over Temp.
o
Four Reset Timeout Periods Available:
1ms, 20ms, 140ms, or 1120ms (minimum)
o
Immune to Short V
CC
Transients
o
5µA Supply Current
o
Pin-Compatible with MAX811
MAX6315
________________________Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Ordering and Marking Information appear at end of
data sheet.
__________Typical Operating Circuit
V
CC
__________________Pin Configuration
V
CC
LASER-
TRIMMED
RESISTORS
TOP VIEW
GND
1
4
V
CC
µP
MAX6315
MR
RESET
CIRCUITRY
RESET
RESET
RESET
2
3
MR
MAX6315
GND
SOT143
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
