MAX6314US44D2 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 68HC11/Bidirectional-Compatible muP Reset Circuit

19-1090; Rev 2; 12/05
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 programmed
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
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Typical Operating Circuit
Features
♦ Small SOT143 Package
♦ RESET Output Simplifies Interface to
Bidirectional Reset I/Os
♦ Precision Factory-Set V_CC Reset Thresholds:
100mV Increments from 2.5V to 5V
♦ ±1.8% Reset Threshold Accuracy at T_A = +25°C
♦ ±2.5% Reset Threshold Accuracy Over Temp.
♦ Four Reset Timeout Periods Available:
1ms, 20ms, 140ms, or 1120ms (minimum)
♦ Immune to Short V_CC Transients
♦ 5µA Supply Current
♦ Pin-Compatible with MAX811
Ordering Information
PART^†
NOMINAL MIN t_RP
V_TH (V)
(ms)
TOP
MARK^††
MAX6314US50D1-T
5.00
1
AA_ _
MAX6314US49D1-T
4.90
1
AB_ _
MAX6314US48D1-T
4.80
1
AC_ _
MAX6314US47D1-T
4.70
1
AD_ _
MAX6314US46D1-T
4.63
1
AE_ _
MAX6314US45D1-T
4.50
1
AF_ _
†_{The MAX6314 is available in a SOT143 package, -40°C to}
+85°C temperature range.
††_{The first two letters in the package top mark identify the part,}
while the remaining two letters are the lot tracking code.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
VCC
VCC
LASER-
TRIMMED
RESISTORS
VCC
68HC11**
RESET
CIRCUITRY
MR
4.7kΩ
RESET
µP
RESET
MAX6314 _GND
**OR OTHER µC/µP WITH BIDIRECTIONAL RESET I/O PIN.
Ordering Information continued at end of data sheet.
Pin Configuration
TOP VIEW
GND 1
MAX6314
4 V_CC
RESET 2
3 MR
SOT143
*P
________________________________________________________________ Maxim Integrated Products 1
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