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Part: MAX6314US47D3-T
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: MAX6314 68HC11 Bidirectional Compatible µP Reset Circuit
Company: Maxim Integrated Products
Datasheet: Download MAX6314US47D3-T datasheet File size : 384 kB
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Datasheet text preview:
19-1090; Rev 1; 1/99
68HC11/Bidirectional-Compatible µP Reset Circuit
General Description
The MAX6314 low-power CMOS microprocessor (µP) s u p e r v i s o r y 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 VCC supply voltage falls below a p r e s e t threshold or whenever manual reset is asserted. Reset remains asserted for an internally programmed interval (reset timeout period) after VCC has r i s e n above the reset threshold or manual reset is deasserted. T h e 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. o Small SOT143 Package o RESET Output Simplifies Interface to Bidirectional Reset I/Os o Precision Factory-Set VCC Reset Thresholds: 100mV Increments from 2.5V to 5V o ±1.8% Reset Threshold Accuracy at TA = +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 VCC Transients o 5µA Supply Current o Pin-Compatible with MAX811
Features
MAX6314*
Ordering and Marking Information appears at end of data sheet.
________________________Applications
Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment
VCC
Typical Operating Circuit
Pin Configuration
VCC
TOP VIEW
GND 1 4 VCC
LASERTRIMMED RESISTORS VCC
68HC11**
µP
MAX6314
RESET CIRCUITRY 4.7k RESET MR RESET 2 3 MR RESET
MAX6314
GND
SOT143
**OR OTHER µC/µP WITH BIDIRECTIONAL RESET I/O PIN.
* Patents Pending
________________________________________________________________ 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.
68HC11/Bidirectional-Compatible µP Reset Circuit MAX6314
ABSOLUTE MAXIMUM RATINGS
VCC ......-0.3V to +6.0V All Other Pins....-0.3V to (VCC + 0.3V) Input Current (VCC) ....20mA Output Current (RESET)......20mA Rate of Rise (VCC) ..100V/µs Continuous Power Dissipation (TA = +70°C) SOT143 (derate 4mW/°C above +70°C) .....320mW Operating Temperature Range ...-40°C to +85°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10sec) .....+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +2.5V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Operating Voltage Range VCC Supply Current Reset Threshold (Note 1) Reset Threshold Tempco VCC to Reset Delay Reset Timeout Period SYMBOL VCC ICC VTH VTH/°C VCC = falling at 1mV/µs MAX6314US_ _D1-T MAX6314US_ _D2-T MAX6314US_ _D3-T MAX6314US_ _D4-T 1 20 140 1120 0.8 2.4 0.3 x VCC 0.7 x VCC 1 100 500 32 VCC > 4.25V, ISINK = 3.2mA RESET Output Voltage VOL VCC > 2.5V, ISINK = 1.2mA VCC > 1.2V, ISINK = 0.5mA VCC > 1.0V, ISINK = 80µA RESET INTERNAL PULL-UP Transition Flip-Flop Setup Time (Note 2) Active Pull-Up Enable Threshold RESET Active Pull-Up Current RESET Pull-Up Resistance RESET Output Rise Time (Note 3) tS VCC = 5V VCC = 5V CLOAD = 120pF CLOAD = 250pF CLOAD = 200pF CLOAD = 400pF 0.4 4.2 VCC = 3V tR VCC = 5V 20 4.7 400 0.9 5.2 333 666 333 666 63 100 0.4 0.3 0.3 0.3 ns V mA k V µs ns ns k V CONDITIONS TA = 0°C to +70°C VCC = 5.5V, no load VCC = 3.6V, no load TA = +25°C TA = -40°C to +85°C MIN 1.0 5 4 VTH 60 35 1.4 28 200 1570 TYP MAX 5.5 12 10 VTH + 1.8% VTH + 2.5% UNITS V µA V ppm/°C µs 2 40 280 2240 ms
VTH - 1.8% VTH - 2.5%
tRP
MANUAL RESET INPUT MR Input Threshold MR Minimum Input Pulse MR Glitch Rejection MR to Reset Delay MR Pull-Up Resistance VIL VIH VIL VIH VTH > 4.0V VTH < 4.0V
ns V
Note 1: The MAX6314 monitors VCC through an internal, factory-trimmed voltage divider that programs the nominal reset threshold. Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Ordering and Marking Information). Note 2: This is the minimum time RESET must be held low by an external pull-down source to set the active pull-up flip-flop. Note 3: Measured from RESET VOL to (0.8 x VCC), RLOAD = . 2 _______________________________________________________________________________________
68HC11/Bidirectional-Compatible µP Reset Circuit
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
PULL-UP CHARACTERISTICS
MAX6314-01
+5V 4.7k
MAX6314
SUPPLY CURRENT vs. TEMPERATURE
MAX6314-02
6 4.7k PULL-UP 2V/div 5 SUPPLY CURRENT (µA) 4 3 VCC = 3V 2 1 0 VCC = 1V VCC = 5V
74HC05
100pF
+5V
74HC05
VCC RESET
MAX6314
MAX6314 PULL-UP 2V/div
100pF
MR
GND
INPUT 5V/div
200ns/div
-50
-30
-10
10
30
50
70
90
TEMPERATURE (°C)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX6314-03
POWER-DOWN RESET DELAY vs. TEMPERATURE
MAX6314-04
NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE (VCC RISING)
NORMALIZED RESET TIMEOUT PERIOD 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96
MAX6314-05
6 5 SUPPLY CURRENT (µA) 4 3 TA = +25°C 2 TA = -40°C 1 0 0 1 2 3 4 5 SUPPLY VOLTAGE (V)
50 POWER-DOWN RESET DELAY (µs) VCC FALLING AT 1mV/µs 40 VTH = 4.63V 30 VTH = 3.00V
1.04
TA = +85°C
20
10
0 -50 -30 -10 10 30 50 70 90 TEMPERATURE (°C)
-50
-30
-10
10
30
50
70
90
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD vs. TEMPERATURE (VCC FALLING)
MAX6314-06
MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE
MAX6314-07
RESET PULL-UP TIME vs. TEMPERATURE
MAX6314-08
1.006 NORMALIZED RESET THRESHOLD 1.004 1.002 1.000 0.998 0.996 0.994 -50 -30 -10 10 30 50 70
100 MAXIMUM TRANSIENT DURATION (µs) TA = +25°C RESET OCCURS ABOVE CURVE
600 500 CL = 390pF 400 300 200 CL = 100pF 100
60
VTH = 4.63V
40
20 VTH = 3.00V 0
RESET PULL-UP-TIME (ns)
80
0 10 100 1000 -50 -30 -10 10 30 50 70 90 RESET COMP. OVERDRIVE, VTH - VCC (mV) TEMPERATURE (°C)
90
TEMPERATURE (°C)
_______________________________________________________________________________________
3
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