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General Description
The MAX6335/MAX6336/MAX6337 microprocessor (µP)supervisory circuits monitor the power supplies in 1.8V to 3.3V µP and digital systems. They increa circuit reli-ability and reduce cost by eliminating external compo-nents and adjustments. They also feature a debounced manual-ret input.
The devices perform a single function: they asrt a ret signal whenever the V CC supply voltage declines below a pret threshold or whenever manual ret is asrted. Ret remains asrted for a pret timeout period after V CC has rin above the ret threshold or after manual ret is deasrted. The only difference among the three devices is their output. The MAX6336(push/pull) and MAX6337 (open-drain) have an active-low RESET output, while the MAX6335 (push/pull) has an active-high RESET output. The MAX6335/MAX6336are guaranteed to be in the correct state for V CC down to 0.7V. The MAX6337 is guaranteed to be in the cor-rect state for V CC down to 1.0V.
The ret comparator in the ICs is designed to ignore fast transients on V CC . Ret thresholds are factory-trimmable between 1.6V and 2.5V, in approximately 100mV increments. There are 15 standard
versions available (2500 piece minimum-order quantity); contact the factory for availability of nonstandard versions (10,000 piece minimum-order quantity). For space-criti-cal applications, the MAX6335/MAX6336/MAX6337come packaged in a 4-pin SOT143.
Applications
Pentium II™ Computers Computers Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring Portable/Battery-Powered Equipment Automotive
Features
o Ultra-Low 0.7V Operating Supply Voltage
o Low 3.3µA Supply Current
o Precision Monitoring of 1.8V and 2.5V Power-Supply Voltages o Ret Thresholds Available from 1.6V to 2.5V,in Approximately 100mV Increments o Debounced Manual Ret o Fully Specified over Temperature
o Three Power-On Ret Pul Widths Available (1ms min, 20ms min, 100ms min)o Low Cost
o Three Available Output Structures: Push/Pull RESET , Push/Pull RESET, Open-Drain RESET o Guaranteed RESET/RESET Valid to V CC = 0.7V (MAX6335/MAX6336)o Power-Supply Transient Immunity o No External Components o 4-Pin SOT143 Package
o Pin-Compatible with MAX811/MAX812 and MAX6314/MAX6315
MAX6335/MAX6336/MAX6337
4-Pin, Ultra-Low-Voltage, Low-Power µP Ret Circuits with Manual Retmaga
________________________________________________________________Maxim Integrated Products 1
19-1412; Rev 0; 12/98
Ordering Information
* The devices are available in factory-t V CC ret thresh-olds from 1.6V to 2.5V, in approximately 0.1V increments.Choo the desired ret threshold suffix from Table 1 and inrt it in the blanks following “US” in the part number.Factory-programmed ret timeout periods are also available.Inrt the number corresponding to the desired nominal ret timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in the blank following “D” in the part number. There are 15 stan-dard versions with a required order increment of 2500 pieces.Sample stock is generally held on the standard versions only (e Selector Guide). Contact the factory for availability of non-standard versions (required order increment is 10,000 pieces).All devices available in tape-and-reel only.
Typical Operating Circuit and Pin Configuration appear at end of data sheet.
Selector Guide appears at end of data sheet.Pentium II is a trademark of Intel Corp.
M A X 6335/M A X 6336/M A X 6337
4-Pin, Ultra-Low-Voltage, Low-Power µP Ret Circuits with Manual Ret 2_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V CC = full range, MR = V CC or unconnected, T A = -40°C to +85°C, unless otherwi noted. Typical values are at T A = +25°C and V CC = 3V, ret not asrted.)
Stress beyond tho listed under “Absolute Maximum Ratings” may cau permanent damage to the device. The are stress ratings only, and functional operation of the device at the or any other conditions beyond tho indicated in the operational ctions of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
V CC ......................................................................-0.3V to +6V Push/Pull RESET or RESET , MR ............-0.3V to (V CC + 0.3V)Open-Drain RESET ..............................................-0.3V to +6V Input Current (V CC ).............................................................20mA Output Current (RESET, RESET )...........
..............................20mA Rate of Ri, 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 -65°C to +160°C Lead Temperature (soldering, 10c).............................+300°C
4-Pin, Ultra-Low-Voltage, Low-Power µP Ret Circuits with Manual Ret
tamall
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2.02.62.2
3.03.63.83.43.2
4.0-60
2.4-40
-20
2.820
40
学习方法有哪些
60
80
100
SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)I C C (µA )
0.950
0.9900.9701.0001.0301.0401.0201.0101.050-60
-40
0.980-20
0.96020
40
60
80
100
三个小矮人NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
TEMPERATURE (°C)N O R M A L I Z E D R E S E T T I M E O U T P E R I O D 02010306070504080
0.50
1.00
1.50
2.00
2.50
3.00
OUTPUT VOLTAGE LOW vs. SUPPLY VOLTAGE
V CC (V)
O U T P U T V O L T A G E L O W (m V )
请假英文英语麦当劳402080601001201401600.5 1.0 1.250.75 1.5 1.75 2.0 2.25 2.5
OUTPUT VOLTAGE HIGH vs. SUPPLY VOLTAGE
V CC (V)
O U T P U T V O L T A G E H I G H (V C C - V O H ) (m V )
1001000
01002004003005006000.1
110MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE
RESET COMPARATOR OVERDRIVE (mV)
M A X I M U M T R A N S I E N T D U R
A T I O N (µs )
10
20-20403070605080
-600-4020406080100
V CC FALLING PROPAGATION DELAY
vs. TEMPERATURE
TEMPERATURE (°C)
P R O P A G A T I O N D E L A Y (µs )
__________________________________________Typical Operating Characteristics
(Ret not asrted, T A = +25°C, unless otherwi noted.)
MAX6335/MAX6336/MAX6337
M A X 6335/M A X 6336/M A X 6337
4-Pin, Ultra-Low-Voltage, Low-Power µP Ret Circuits with Manual Ret 4
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手动挡汽车起步Pin Description
bulbApplications Information
Manual-Ret Inputs
匍匐Many µP-bad products require manual-ret capabil-ity, allowing the operator, a test technician, or external logic circuitry to initiate a ret. A logic low on MR asrts ret. Ret remains asrted while MR is low,and for the ret active timeout period after MR returns high. MR has an internal 20k Ωpull-up resistor, so it can be left unconnected if not ud. Connect a normally open momentary switch from MR to GND to create a manual-ret function; external debounce circuitry is not required.
Interfacing to µPs with Bidirectional Ret Pins
Since the RESET output on the MAX6337 is open-drain,this device interfaces easily with µPs that have bidirec-tional ret pins, such as the Motorola 68HC11.Connecting the µP supervisor’s RESET output directly to the microcontroller’s (µC’s) RESET pin with a single pull-up resistor allows either device to asrt ret (Figure 1).
Negative-Going V CC Transients
In addition to issuing a ret to the µP during power-up,power-down, and brownout conditions, the devices are relatively immune to short-duration, negative-going V CC transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Ret Comparator Over
drive graph. The graph shows the maximum pul width that a negative-going V CC transient may typically have without issuing a ret
signal. As the amplitude of the transient increas, the maximum allowable pul width decreas.
Ensuring a Valid Ret Output
down to V CC = 0
When V CC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-structured ret sinking (or sourcing) capabilities decrea drastically.High-impedance CMOS-logic inputs connected to the RESET pin can drift to indeterminate voltages. This does not prent a problem in most cas, since most µPs and circuitry do not operate at V CC below 1V. For the MAX6336, where RESET must be valid down to 0,adding a pull-down resistor between RESET and GND removes stray leakage currents, holding RESET low
Figure 1. Interfacing to µPs with Bidirectional Ret Pins
4-Pin, Ultra-Low-Voltage, Low-Power µP Ret Circuits with Manual Ret
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MAX6335/MAX6336/MAX6337
*100mV increments, with a ±1.8% room-temperature variance.
Table 1. Factory-Trimmed Ret Thresholds*
Figure 2. Ensuring Ret Valid down to V CC = 0
(Figure 2a). The pull-down resistor value is not critical;100k Ωis large enough not to load RESET , and small enough to pull it low. For the MAX6335, where RESET must be valid to V CC = 0, a 100k Ωpull-up resistor between RESET and V CC will hold RESET high when V CC falls below 0.7V (Figure 2b).
Since the MAX6337 has an open-drain, active-low out-put, it typically us a pull-up resistor. With this device,RESET will most likely not maintain an active condition,but will drift to a non-active level due to the pull-up resistor and the reduced sinking capability of the open-drain device. Therefore, this device is not recommend-ed for applications where the RESET pin is required to be valid down to V CC = 0.
M A X 6335/M A X 6336/M A X 6337
4-Pin, Ultra-Low-Voltage, Low-Power µP Ret Circuits with Manual Ret 6_______________________________________________________________________________________
PART
OUTPUT STAGE NOMINAL V TH (V)
MINIMUM RESET TIMEOUT (ms)
SOT TOP MARK
MAX6335US23D3-T Push/Pull RESET 2.30100KABQ MAX6335US22D3-T Push/Pull RESET 2.20100KAAR MAX6335US20D3-T Push/Pull RESET 2.00100KABP MAX6335US18D3-T Push/Pull RESET 1.80100KAAQ MAX6335US16D3-T Push/Pull RESET 1.60100KAAP MAX6336US23D3-T Push/Pull
RESET 2.30100KAAW MAX6336US22D3-T Push/Pull RESET 2.20100KAAV MAX6336US20D3-T Push/Pull RESET 2.00100KAAU MAX6336US18D3-T Push/Pull RESET 1.80100KAAT MAX6336US16D3-T Push/Pull RESET 1.60100KAAS MAX6337US23D3-T Open-Drain RESET 2.30100KABS MAX6337US22D3-T Open-Drain RESET 2.20100KAAZ MAX6337US20D3-T Open-
Drain RESET 2.00100KABR
MAX6337US18D3-T Open-Drain RESET 1.80100KAAY MAX6337US16D3-T
Open-Drain RESET
1.60
100
年中总结范文
KAAX
Selector Guide (standard versions *)
Pin Configuration
Typical Operating Circuit
* Sample stock is generally held on all standard versions.
