MAX6314 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 68HC11/Bidirectional-Compatible μP Reset Circuit

19-1090; Rev 1; 1/99
68HC11/Bidirectional-Compatible
µP Reset Circuit
General Description
The MAX6314 low-power CMOS microprocessor (µP)
supervisory circuit is designed to monitor power
supplies in µP and digital systems. The MAX6314’s
RESET output is bidirectional, allowing it to be directly
connected to µPs with bidirectional reset inputs, such
as the 68HC11. It provides excellent circuit reliability
and low cost by eliminating external components and
adjustments. The MAX6314 also provides 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 pro-
grammed interval (reset timeout period) after V_CC has
risen above the reset threshold or manual reset is
deasserted.
The MAX6314 comes with factory-trimmed reset
threshold 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 a µP supervisor with an open-drain reset pin, see
the MAX6315 data sheet.
________________________Applications
Features
o Small SOT143 Package
o RESET Output Simplifies Interface to
Bidirectional Reset I/Os
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
Ordering and Marking Information appears at end of
data sheet.
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Pin Configuration
TOP VIEW
GND 1
MAX6314
4 V_CC
RESET 2
3 MR
SOT143
Typical Operating Circuit
VCC
VCC
LASER-
TRIMMED
RESISTORS
VCC
68HC11**
RESET
CIRCUITRY
MR
4.7k
RESET
µP
RESET
MAX6314 _GND
**OR OTHER µC/µP WITH BIDIRECTIONAL RESET I/O PIN.
* Patents Pending
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