MAXIM MAX6314, MAX68HC11 Technical data

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 VCCsupply voltage falls below a preset threshold or whenever manual reset is asserted. Reset remains asserted for an internally pro­grammed interval (reset timeout period) after VCChas 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
Features
Small SOT143 PackageRESET Output Simplifies Interface to
Bidirectional Reset I/Os
Precision Factory-Set VCCReset Thresholds:
100mV Increments from 2.5V to 5V
±1.8% Reset Threshold Accuracy at TA= +25°C ♦ ±2.5% Reset Threshold Accuracy Over Temp.Four Reset Timeout Periods Available:
1ms, 20ms, 140ms, or 1120ms (minimum)
Immune to Short VCCTransients ♦ 5µA Supply CurrentPin-Compatible with MAX811
MAX6314*
68HC11/Bidirectional-Compatible
µP Reset Circuit
________________________________________________________________
Maxim Integrated Products
1
1
2
4
3
V
CC
MRRESET
GND
MAX6314
SOT143
TOP VIEW
Pin Configuration
MAX6314
V
CC
V
CC
GND
RESET
µP
RESET
MR
LASER­TRIMMED RESISTORS
V
CC
4.7k
68HC11**
**OR OTHER µC/µP WITH BIDIRECTIONAL RESET I/O PIN.
RESET
CIRCUITRY
Typical Operating Circuit
19-1090; Rev 1; 1/99
Ordering and Marking Information appears at end of data sheet.
* Patents Pending
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.
查询MAX6314*供应商
V
MAX6314
68HC11/Bidirectional-Compatible µP Reset Circuit
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +2.5V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°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.
Note 1: The MAX6314 monitors VCCthrough 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 V
OL
to (0.8 x VCC), R
LOAD
= ∞.
V
CC
........................................................................-0.3V to +6.0V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
Input Current (V
CC
).............................................................20mA
Output Current (RESET)......................................................20mA
Rate of Rise (V
CC
)...........................................................100V/µs
Continuous Power Dissipation (T
A
= +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
T
A
= +25°C
VCC= 5.5V, no load
TA= 0°C to +70°C
VTH> 4.0V
VCC= falling at 1mV/µs MAX6314US_ _D1-T
VCC> 4.25V, I
SINK
= 3.2mA
CONDITIONS
V
0.4
V
OL
RESET Output Voltage
k32 63 100
MR Pull-Up Resistance
VTH- 1.8% V
THVTH
+ 1.8%
V
TH
Reset Threshold (Note 1)
µA
512
I
CC
V1.0 5.5V
CC
Operating Voltage Range VCCSupply Current
ns500
MR to Reset Delay
ns100
MR Glitch Rejection
µs1
MR Minimum Input Pulse
V
0.8V
IL
MR Input Threshold
ppm/°C60∆VTH/°CReset Threshold Tempco
µs35VCCto Reset Delay
ms
1 1.4 2
t
RP
Reset Timeout Period
UNITSMIN TYP MAXSYMBOLPARAMETER
V
IL
V
IH
V
IH
VCC= 3.6V, no load
TA= -40°C to +85°C
VTH< 4.0V
MAX6314US_ _D3-T
MAX6314US_ _D2-T
MAX6314US_ _D4-T
VCC> 1.2V, I
SINK
= 0.5mA
VCC> 2.5V, I
SINK
= 1.2mA
VCC> 1.0V, I
SINK
= 80µA
410
VTH- 2.5% VTH+ 2.5%
1120 1570 2240
140 200 280
20 28 40
0.3 x V
CC
2.4
0.7 x V
CC
0.3
0.3
0.3
V
ns400t
S
Transition Flip-Flop Setup Time (Note 2)
VCC= 5V
VCC= 5V
mA20
RESET Active Pull-Up Current
V0.4 0.9Active Pull-Up Enable Threshold
VCC= 3V
ns
333
k4.2 4.7 5.2
RESET Pull-Up Resistance
333
666
VCC= 5V
666
t
R
RESET Output Rise Time (Note 3)
C
LOAD
= 120pF
C
LOAD
= 250pF
C
LOAD
= 200pF
C
LOAD
= 400pF
MANUAL RESET INPUT
RESET INTERNAL PULL-UP
MAX6314
68HC11/Bidirectional-Compatible
µP Reset Circuit
_______________________________________________________________________________________ 3
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
4.7k PULL-UP 2V/div
MAX6314 PULL-UP 2V/div
INPUT 5V/div
200ns/div
PULL-UP CHARACTERISTICS
MAX6314-01
100pF
4.7k
+5V
74HC05
74HC05
V
CC
GND
MR
100pF
+5V
RESET
MAX6314
6
0
-50 -30 30 90
SUPPLY CURRENT vs. TEMPERATURE
2
1
5
MAX6314-02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
-10 10 50
3
4
70
VCC = 5V
VCC = 3V
VCC = 1V
6
0
0
1
35
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
2
1
5
MAX6314-03
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
2
3
4
4
TA = -40°C
TA = +25°C
TA = +85°C
50
0
-50 -30 10 90
POWER-DOWN RESET DELAY
vs. TEMPERATURE
10
40
MAX6314-04
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (µs)
-10
20
30
30 50 70
VCC FALLING AT 1mV/µs
VTH = 4.63V
VTH = 3.00V
1.04
0.96
-50 -30 10 90
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE (V
CC
RISING)
0.97
0.98
1.02
1.00
1.03
MAX6314-05
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
-10
0.99
1.01
30 50 70
1.006
0.994
-50 -30 10 90
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE (V
CC
FALLING)
0.996
0.998
1.004
1.000
MAX6314-06
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
-10
1.002
30 50 70
100
0
10 100 1000
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
20
MAX6314-07
RESET COMP. OVERDRIVE, VTH - VCC (mV)
MAXIMUM TRANSIENT DURATION (µs)
40
60
80
TA = +25°C RESET OCCURS ABOVE CURVE
VTH = 4.63V
VTH = 3.00V
600
0
-50 -30 10 90
RESET PULL-UP TIME
vs. TEMPERATURE
100
200
500
300
MAX6314-08
TEMPERATURE (°C)
RESET PULL-UP-TIME (ns)
-10
400
30 50 70
CL = 390pF
CL = 100pF
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