MAX6576ZUT+-MAX6577ZUT+T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX6576ZUT+-MAX6577ZUT+T
SOT Temperature Sensors with Period/Frequency Output
General Description
The MAX6576/MAX6577 are low-cost, low-current tem-
perature sensors with a single-wire output. The MAX6576
converts the ambient temperature into a square wave with
a period proportional to absolute temperature (°K). The
MAX6577 converts the ambient temperature into a square
wave with a frequency proportional to absolute tempera-
ture. The MAX6576 offers accuracy of ±3°C at +25°C,
±4.5°C at +85°C, and ±5°C at +125°C. The MAX6577
offers accuracy of ±3°C at +25°C, ±3.5°C at +85°C, and
±4.5°C at +125°C.
Both devices feature a single-wire output that minimizes
the number of pins necessary to interface with a micropro-
cessor. The period/frequency range of the output square
wave can be selected by hard-wiring the two time-select
pins (TS0, TS1) to either VDD or GND. The MAX6576/
MAX6577 are available in space-saving 6-pin SOT23
packages.
Applications●Critical μP and μC Temperature Monitoring●Portable Battery-Powered Equipment●Cell Phones●Battery Packs●Hard Drives/Tape Drives●Networking and Telecom Equipment●Medical Equipment
Features●Simple Single-Wire Output●Two Output Types Available • Temperature to Period (μs) (MAX6576) Temperature to Frequency (Hz) (MAX6577)●±0.8°C Accuracy at +25°C (±3°C max)●No External Components●Operates from +2.7V to +5.5V Supply Voltage●Low 140μA Typical Supply Current●Standard Operating Temperature Range:
-40°C to +125°C●Small 6-Pin SOT23 Package
PARTTEMP. RANGEPIN-
PACKAGE
SOT TOP
MARK
MAX6576ZUT-40°C to +125°C6 SOT23AABI
MAX6577ZUT-40°C to +125°C6 SOT23AABJ
GND
TS0N.C.6OUTTS1
VDD
SOT23-6
TOP VIEW4
MAX6576
MAX6577
+2.7V TO +5.5V
GNDTS0
TS1
OUT
0.1µF0.1µFVDD
GND
I/O
VCC
MAX6576
MAX6577
MAX6576/MAX6577SOT Temperature Sensors with
Period/Frequency Output
Pin ConigurationTypical Operating Circuit
Ordering Information
Terminal Voltage (with respect to GND)
VDD.......................................................................-0.3V to +6V
TS1, TS0, OUT.......................................-0.3V to (VDD + 0.3V)Input/Output Current, All Pins............................................±20mAContinuous Power Dissipation (TA = +70°C)
6-pin SOT23 (derate 7.10mW/°C above +70°C)..........571mW
Operating Temperature Range...........................-40°C to +125°C
Storage Temperature Range..............................-65°C to +150°C
Lead Temperature (soldering, 10sec)...............................+300°C
(VDD = +2.7V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are specified at TA = +25°C and VDD = +5V,
unless otherwise noted.)
Note 1: See the Temperature Accuracy histograms in the Typical Operating Characteristics.
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
VDD RangeVDD2.75.5V
Supply CurrentIDDVDD = 5.5V
TA = -40°C to +85°C140250TA = -40°C to +125°C400
Temperature SensorError (Note 1)
MAX6576
TA = -20°C-7.5±1.1+7.5
TA = 0°C-5.5±0.9+5.5
TA = +25°C-3.0±0.8+3.0
TA = +85°C-4.5±0.5+4.5
TA = +125°C-5.0±0.5+5.0
MAX6577
TA = -20°C-7.5±1.1+7.5
TA = 0°C-6.5±0.9+6.5
TA = +25°C-3.0±0.8+3.0
TA = +85°C-3.5±0.5+3.5
TA = +125°C-4.5±0.5+4.5
Output Clock PeriodtOUT
MAX6576,
T (temp) in °K,
Figure 1
VTS1 = GND, VTS0 = GND10TVTS1 = GND, VTS0 = VDD40T
VTS1 = VDD, VTS0 = GND160T
VTS1 = VDD, VTS0 = VDD640T
Output Clock FrequencyfOUT
MAX6577,
T (temp) in °K,
Figure 2
VTS1 = GND, VTS0 = GND4TVTS1 = GND, VTS0 = VDD1T
VTS1 = VDD, VTS0 = GNDT/4
VTS1 = VDD, VTS0 = VDDT/16
OUT Duty Cycle (Note 2)0.5
Time-Select Pin Logic LevelsVIL0.8VVIH2.3
OUT Voltage
VOLVDD > 4.5V, ISINK = 3.2mA0.4VDD > 2.7V, ISINK = 1.2mA0.3
VOH
VDD > 4.5V, ISRC = 800μAVDD - 1.5
VDD > 2.7V, ISRC = 500μA0.8VDD
MAX6576/MAX6577SOT Temperature Sensors with
Period/Frequency Output
Absolute Maximum Ratings
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
(VDD = +5V, TA = +25°C, unless otherwise noted.)-3-2-4-1012345
TEMPERATURE ACCURACY
(TA = +85°C)
MAX6576 toc02
ACCURACY (°C)
PERCENTAGE OF PARTS SAMPLED (%)
MAX6576
MAX6577
SAMPLE SIZE = 200
SUPPLY CURRENT vs. TEMPERATURE
MAX6576/77toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
MAX6577
MAX6576
ACCURACY vs. TEMPERATURE
MAX6575 toc04
TEMPERATURE (°C)
ACCURACY (°C)
MAX6576
MAX6577
+15°C/div
+100°C
+25°C
THERMAL STEP RESPONSE
IN PERFLUORINATED FLUID
MAX6576/77 toc05
MOUNTED ON 0.75 in.2
OF 2oz. COPPER-3-2-4-1012345
TEMPERATURE ACCURACY
(TA= +25°C)
MAX6576 toc01
ACCURACY (°C)
PERCENTAGE OF PARTS SAMPLED (%)
MAX6576
MAX6577
SAMPLE SIZE = 200
+12.5°C/div
+100°C
+25°C
THERMAL STEP RESPONSE
IN STILL AIR
MAX6576/77 toc06
MOUNTED ON 0.75 in.2
OF 2oz. COPPER
MAX6576/MAX6577SOT Temperature Sensors with
Period/Frequency Output
Typical Operating Characteristics
Detailed Description
The MAX6576/MAX6577 low-cost, low-current (140μA
typ) temperature sensors are ideal for interfacing with microcontrollers (μCs) or microprocessors (μPs). The
MAX6576 converts ambient temperature into a 50%
dutycycle square wave with a period proportional to
absolute temperature. The MAX6577 converts ambient
temperature into a 50% duty-cycle square wave with a
frequency proportional to absolute temperature. Time-
select pins (TS1, TS0) permit the internal temperature-
controlled oscillator (TCO) to be scaled by four preset
multipliers. The MAX6576/MAX6577 feature a single-wire
interface to minimize the number of port pins necessary for interfacing with a μP.
MAX6576 Characteristics
The MAX6576 temperature sensor converts temperature
to period. The output of the device is a free-running, 50%
duty-cycle square wave with a period that is proportional
to the absolute temperature (°K) of the device (Figure 1).
The MAX6576 has a push/pull CMOS output with sharp
edges. The speed of the output square wave can be
selected by hard-wiring TS1 and TS0 as shown in Table 1.
One of four scaled output periods can be selected using
TS1 and TS0.
MAX6577 Characteristics
The MAX6577 temperature sensor converts temperature
to frequency. The output of the device is a free-running,
50% duty-cycle square wave with a frequency that is pro-
portional to the absolute temperature (°K) of the device
(Figure 2). The MAX6577 has a push/pull CMOS output
with sharp edges. The speed of the output square wave
can be selected by hard-wiring TS1 and TS0 as shown
in Table 2. One of four scaled output frequencies can be
selected using TS1 and TS0.
Table 1. MAX6576 Time-Select Pin ConfigurationTable 2. MAX6577 Time-Select Pin Configuration
PINNAMEFUNCTIONVDDPositive Supply VoltageGNDGroundN.C.No Connection. Connect pin to GND or leave open.
4, 5TS1, TS0Time-Select Pins. TS1 and TS0 set the temperature scale factor by connecting TS1 and TS0 to either VDD
or GND. See Tables 1 and 2.OUTSquare-Wave Output with a Clock Period Proportional to Absolute Temperature (°K) (MAX6576)
Square-Wave Output with a Clock Frequency Proportional to Absolute Temperature (°K) (MAX6577)
TS1TS0SCALAR MULTIPLIER (μs/°K)
GNDGND10
GNDVDD40
VDDGND160
VDDVDD640
TS1TS0SCALAR MULTIPLIER (Hz/°K)
GNDGND4
GNDVDD1
VDDGND1/4
VDDVDD1/16
Note: The temperature, in °C, may be calculated as follows:
PERIOD(µs)T(C)273.15KSCALARMULTIPLIER(µs/K)°=−°°
FREQUENCY(µs)T(C)273.15KSCALARMULTIPLIER(µs/K)°=−°°
Note: The temperature, in °C, may be calculated as follows:
MAX6576/MAX6577SOT Temperature Sensors with
Period/Frequency Output
Pin Description
Applications Information
Quick-Look Circuits
Figure 3 shows a quick-look application circuit for the
MAX6576 using a universal counter measuring period.
TS1 and TS0 are both tied to ground to select a scalar multiplier of 10μs/°K. The MAX6576 converts the ambi-
ent temperature into a square wave with a period that is 10 times the absolute temperature of the device in μs.
At room temperature, the universal counter will display approximately 2980μs.
Figure 4 shows a quick-look application circuit for the
MAX6577 using a universal counter measuring frequency.
TS1 is tied to ground and TS0 is tied to VDD to select a
scalar multiplier of 1Hz/°K. The MAX6577 converts the
ambient temperature into a square wave with a frequency
that is equal to the absolute temperature of the device
in Hertz. At room temperature, the universal counter will
display approximately 298Hz.
Interfacing with a Microcontroller
Figure 5 shows the MAX6577 interfaced with an 8051 μC.
In this example, TS1 is tied to ground and TS0 is tied to
VDD to select a scalar multiplier of 1Hz/°K. The MAX6577
converts the ambient temperature into a square wave with
a frequency that is equal to the absolute temperature of the device in Hertz. The 8051 μC reads the frequency of
the square-wave output of the MAX6577 into Timer 0 and
displays the temperature as degrees Celsius in binary on Port 1. Listing 1 provides the code for this application. The interface is similar for the MAX6576, except the μC will
perform a period measurement.
Noise Considerations
The accuracy of the MAX6576/MAX6577 is susceptible to
noise generated both internally and externally. The effects of external noise can be minimized by placing a 0.1μF
ceramic bypass capacitor close to the supply pin of the
devices. Internal noise is inherent in the operation of the
devices and is detailed in Table 3. Internal averaging mini-
mizes the effect of this noise when using longer scalar
timeout multipliers. The effects of this noise are included
in the overall accuracy of the devices as specified in the
Electrical Characteristics.
Figure 1. MAX6576 Timing DiagramFigure 2. MAX6577 Timing Diagram
tOUT
MAX6576
CLOCK WAVEFORM OUTPUT
tOUT
MAX6577
CLOCK WAVEFORM OUTPUT
fOUT = 1 / tOUT
fOUT (°K)
MAX6576/MAX6577SOT Temperature Sensors with
Period/Frequency Output
Figure 3. MAX6576 Quick-Look Circuit
Figure 4. MAX6577 Quick-Look Circuit
Figure 5. Interfacing with a μC
Table 3. Typical Peak Noise Amplitude
PARAMETERMAX6576MAX6577
Scalar Multiplier1040160640411/41/16
Noise Amplitude (°C)±0.38±0.17±0.11±0.094±0.13±0.066±0.040±0.028
GND
TS0
TS1
OUT
0.1µFVDD
+2.7V TO +5.5V
UNIVERSAL COUNTER
"PERIOD"
MAX6576
GND
TS0
TS1
OUT
0.1µFVDD
+2.7V TO +5.5V
UNIVERSAL COUNTER
"FREQUENCY"
MAX6577
GND
TS0
TS1
OUT
0.1µFVDD
+2.7V TO +5.5V
GNDX2
470Ω x 8
VCC
P1.1
P1.0
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
805112MHz
22pF
22pF
MAX6577
MAX6576/MAX6577SOT Temperature Sensors with
Period/Frequency Output
Chip Information
TRANSISTOR COUNT: 302

Partno	Mfg	Dc	Qty	Available	Descript
MAX6576ZUT+ \|MAX6576ZUT	MAX	N/a	100	avai	SOT Temperature Sensors with Period/Frequency Output
MAX6577ZUT+T \|MAX6577ZUTT	MAXIM	N/a	2500	avai	SOT Temperature Sensors with Period/Frequency Output