View MAX6360_15599.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1508; Rev 1; 10/99
Dual/Triple-Voltage P Supervisory Circuits
General Description
The MAX6351-MAX6360 microprocessor (P) supervisors with multiple reset voltages significantly improve system reliability and accuracy compared to separate ICs or discrete components. If any input supply voltage drops below its associated preset threshold, all reset outputs are asserted. In addition, the output(s) is valid as long as either input supply voltage remains greater than +1.0V. All devices in this series have an active-low debounced manual reset input. In addition, the MAX6358/MAX6359/ MAX6360 offer a watchdog timer input with a 46.4sec start-up timeout period and a 2.9sec timeout period. The MAX6355/MAX6356/MAX6357 offer an additional voltage monitor input to monitor a third voltage. The MAX6351 features both 3V and 5V active-low pushpull reset outputs. The MAX6353/MAX6356/MAX6359 offer a 5V active-low push-pull reset. The MAX6354/ MAX6357/MAX6360 offer a 3V active-low push-pull reset. The MAX6352/MAX6355/MAX6358's reset is active-low open-drain. All of these devices are offered with a wide variety of voltage threshold levels, as shown in the Voltage Threshold Levels table below. They are available in 5and 6-pin SOT23 packages and operate over the extended (-40C to +85C) temperature range.
Features
o Precision Monitoring of Multiple +2.5V, +3.0V, +3.3V, and +5V Power-Supply Voltages o Precision Factory-Set Power-Supply Reset Thresholds o 20A Supply Current o 100ms min Power-On Reset Pulse Width o Fully Guaranteed Over Temperature o Guaranteed RESET Valid to VCC5 = 1V or VCC3 = 1V o Power-Supply Transient Immunity o No External Components for Dual-Voltage Systems o Small 5- and 6-Pin SOT23 Packages o Debounced TTL/CMOS-Compatible Manual-Reset Input o Watchdog Timer 46.4sec Start-Up Timeout 2.9sec Normal Timeout o Low Cost
MAX6351-MAX6360
Applications
Computers Controllers Portable/Battery-Powered Equipment Intelligent Instruments Multivoltage Systems
PART* MAX6351_ _UT-T MAX6352_ _UK-T MAX6353_ _UK-T MAX6354_ _UK-T MAX6355_ _UT-T MAX6356_ _UT-T MAX6357_ _UT-T MAX6358_ _UT-T MAX6359_ _UT-T MAX6360_ _UT-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 6 SOT23-6 5 SOT23-5 5 SOT23-5 5 SOT23-5 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6
__________Voltage Threshold Levels
PART NO. SUFFIX (_ _) LT LS LR MT MS MR TY SY VCC5 NOMINAL VOLTAGE THRESHOLD (V) 4.63 4.63 4.63 4.38 4.38 4.38 3.08 2.93 VCC3 NOMINAL VOLTAGE THRESHOLD (V) 3.08 2.93 2.63 3.08 2.93 2.63 2.19 2.19
*The _ _ are placeholders for the threshold voltage levels of the devices. Substitute the part number suffix in the Voltage Threshold Levels table for the desired voltage level. There are two standard versions for each of the above part numbers. All devices are available in tape-and-reel only.
Note: Standard versions are shown in bold and have a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only. The required order increment for nonstandard versions is 10,000 pieces. Contact factory for availability.
Pin Configurations appear at end of data sheet. Selector Guide appears at end of data sheet.
1
________________________________________________________________ Maxim Integrated Products
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.
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
ABSOLUTE MAXIMUM RATINGS
VCC5, VCC3 to GND .................................................-0.3V to +6V RST (MAX6352/55/58) ............................................. -0.3V to +6V RST, MR, WDI, RST5, RSTIN (MAX6351/53/56/59).............................-0.3V to (VCC5 + 0.3V) RST, RST3 (MAX6351/54/57/60) .................-3V to (VCC3 + 0.3V) Input/Output Current, All Pins .............................................20mA Continuous Power Dissipation (TA = +70C) 5-Pin SOT23-5 (derate 7.1mW/C above +70C) ........571mW 6-Pin SOT23-6 (derate 7.1mW/C above +70C) ........571mW Operating Temperature Range ...........................-40C to +85C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10sec) .............................+300C
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
(VCC3 = VCC5 = +1.2V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER Supply Voltage Range (Note 2) Supply Current SYMBOL VCC ICC5 + ICC3 CONDITIONS TA = 0C to +70C TA = -40C to +85C VCC5 = 5.5V, VCC3 = 3.6V, all I/O pins open MAX63_ _L_ MAX63_ _M_ VCC5 Threshold (Note 3) VTH5 MAX63_ _T_ MAX63_ _S_ MAX63_ _ _T MAX63_ _ _S VCC3 Threshold (Note 3) VTH3 MAX63_ _ _R MAX63_ _ _Y Reset Threshold Tempco Reset Threshold Hysteresis VCC to Reset Delay Reset Timeout Period tRP 100mV overdrive VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) VCC5 or VCC3 2.7V, ISINK = 1.2mA VCC5 or VCC3 4.5V, ISINK = 3.2mA RESET Output Voltage Low VOL VCC5 or VCC3 < 1V, ISINK = 50A, TA = 0C to +70C VCC5 or VCC3 < 1.2V, ISINK = 50A 100 VTH/C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C TA = +25C TA = -40C to +85C 4.54 4.5 4.3 4.25 3.03 3.00 2.88 2.85 3.03 3.00 2.88 2.85 2.58 2.55 2.16 2.13 20 VTH/500 20 180 280 0.3 0.4 0.3 0.3 V V 2.19 2.63 2.93 3.08 2.93 3.08 4.38 MIN 1.0 1.2 20 4.63 TYP MAX 5.5 5.5 50 4.72 4.75 4.46 4.50 3.14 3.15 2.98 3.00 3.14 3.15 2.98 3.00 2.68 2.70 2.22 2.25 ppm/C V s ms V V UNITS V A
2
_______________________________________________________________________________________
Dual/Triple-Voltage P Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC3 = VCC5 = +1.2V to +5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS MAX6351/MAX6353/ MAX6354/MAX6356/ MAX6357/MAX6359/ MAX6360 (_Y versions only), VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) RESET Output Voltage High VOH MAX6351/MAX6353/ MAX6354/MAX6356/ MAX6357/MAX6359/ MAX6360 ISOURCE = 800A (L_, M_ versions only), VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) WATCHDOG INPUT (MAX6358/MAX6359/MAX6360) Watchdog Timeout Period WDI Pulse Width (Note 4) WDI Input Threshold (Note 5) WDI Input Current (Note 6) MANUAL RESET INPUT VIL MR Input VIH VIL VIH MR Pull-Up Resistance MR Minimum Pulse Width MR Glitch Rejection MR to Reset Delay tMD VCC5 > VTH5(MAX), VCC3 > VTH3(MAX) TA = +25C TA = -40C to +85C 1.20 1.19 -25 2.5 ADJUSTABLE RESET COMPARATOR INPUT (MAX6355/MAX6356/MAX6357) RSTIN Input Threshold RSTIN Input Current RSTIN Hysteresis VRSTIN IRSTIN 1.22 1.24 1.25 25 V nA mV tRP MAX63_ _L_, MAX63_ _M_, VCC5 > VTH5(MAX) MAX63_ _L_, MAX63_ _M_, VCC5 > VTH5(MAX) MAX63_ _ _Y, VCC5 > VTH5(MAX) MAX63_ _ _Y, VCC5 > VTH5(MAX) 32 10 100 0.1 63.5 0.3VCC 0.7VCC 100 k s ns s 0.8 2.3 V tWD tWDI VIL VIH First timeout period after reset After first WDI falling edge VIL = 0.4V, VIH = 0.8VCC VCC3 = 5V VWDI = VCC VWDI = 0 -20 25.6 1.6 50 0.3VCC 0.7VCC 120 -15 160 46.4 2.9 72.0 4.5 sec ns V A MIN TYP MAX UNITS
MAX6351-MAX6360
ISOURCE = 500A
0.8VCC
V
VCC - 1.5
0 < VRISTIN < VCC5 - 0.3V
Note 1: Overtemperature limits are guaranteed by design and not production tested. Note 2: The reset output is guaranteed to be in the correct state if either VCC3 or VCC5 is within its specified region of operation. Note 3: The reset output(s) is asserted if either VCC5 or VCC3 drops below its associated trip point. Note 4: Guaranteed by design. Not production tested. Note 5: WDI is internally serviced within the watchdog timeout period if WDI is left unconnected. Note 6: The WDI input current is specified as the average input current when the WDI input is driven high or low. _______________________________________________________________________________________ 3
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
Typical Operating Characteristics
(VCC = +5V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6351/60-01
RESET vs. VCC5 (VCC3 = 3V)
MAX6351/60-02
RESET vs. VCC5 (VCC3 = GND)
4.5 4.0 3.5 RESET (V)
VCC VCC5 OR VCC3 RST RST3 RST5 10k
MAX6351/60-03 MAX6351/60-06
20 ICC5 (VCC5 = 5.0V, VCC3 = 3.3V) SUPPLY CURRENT (A) 15 ICC5 (VCC5 = 3.3V, VCC3 = 2.5V) 10
5.0 4.5 4.0 3.5 RESET (V) 3.0 2.5 2.0 1.5 1.0 VTH
5.0
3.0 2.5 2.0 1.5 1.0 0.5 0
MAX6351 MAX6360
5
ICC3 (VCC5 = 5.0V, VCC3 = 3.3V) ICC3 (VCC5 = 3.3V, VCC3 = 2.5V)
0.5 0 85 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCC5 (V)
0 -40 -15 10 35 60 TEMPERATURE (C)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 VCC5 (V)
NORMALIZED RESET/WATCHDOG PERIOD vs. TEMPERATURE
MAX6351/60-04
MAXIMUM VCC TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE
RESET OCCURS ABOVE LINE 250 TRANSIENT DURATION (s) 200 150 100 50 0
MAX6351/60-05
RESET DELAY vs. RESET THRESHOLD OVERDRIVE
250
1.20 1.15 NORMALIZED PERIOD 1.10 1.05 1.00 0.95 0.90 0.85 0.80 -60 -40 -20 0 20 40 60 80
300
200 RESET DELAY (s)
150
100 DELAY FROM FALL OF VCC3 50 DELAY FROM FALL OF VCC5 0
100
0.01
0.1
1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 RESET THRESHOLD OVERDRIVE, VRST - VCC (V)
TEMPERATURE (C)
RESET THRESHOLD OVERDRIVE, VRST - VCC (V)
PULL-UP CHARACTERISTICS
MAX6351/60-07
PULL-DOWN CHARACTERISTICS AND MANUAL RESET DELAY
MAX6351/60-08
5V 0
5V PUSH-PULL OUTPUT
5V
MR
0 5V OPEN-DRAIN OUTPUT 0 3V 0 400ns/div
OPEN-DRAIN OUTPUT
5V 0
3V PUSH-PULL OUTPUT 5V PUSH-PULL OUTPUT 40ns/div
5V 0 5V 0
3V PUSH-PULL OUTPUT
4
_______________________________________________________________________________________
Dual/Triple-Voltage P Supervisory Circuits
Pin Description
PIN MAX6351 1 MAX6352 MAX6353 MAX6354 -- MAX6355 MAX6356 MAX6357 -- MAX6358 MAX6359 MAX6360 -- NAME FUNCTION
MAX6351-MAX6360
RST5
Active-Low, 5V CMOS Reset Output Active-Low Reset Output. Open-drain for the MAX6352/MAX6355/MAX6358, 5V push-pull for the MAX6353/MAX6356/MAX6359, and 3V push-pull for the MAX6354/MAX6357/MAX6360. Ground Manual-Reset Input. Pull low to force a reset. RST, RST5, and RST3 remain active as long as MR is low and for the timeout period after MR goes high. Leave unconnected or connect to VCC5 if unused. V MR must be below VCC5. +3.3V/+3.0V Supply Input. Powers the device when it is above VCC5 and monitors its own voltage. Active-Low, 3V CMOS Reset Output Undervoltage Reset Comparator Input. Asserts reset when the monitored voltage falls below 1.23V. Set the reset threshold with an external resistordivider. Connect to VCC5 if unused. VRSTIN must be below VCC5. Watchdog Input. If WDI remains either high or low longer than the timeout period, then reset is triggered. The timer clears when reset is asserted or whenever WDI sees a rising or falling edge. Leave floating to disable it if unused. +5V Supply Input. Powers the device when it is above VCC3 and monitors its own voltage.
--
1
1
1
RST
2
2
2
2
GND
3
3
3
3
MR
4 5
4 --
4 --
4 --
VCC3 RST3
--
--
5
--
RSTIN
--
--
--
5
WDI
6
5
6
6
VCC5
_______________________________________________________________________________________
5
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
Detailed Description
Supply Voltages
The MAX6351-MAX6360 microprocessor (P) supervisory circuits maintain system integrity by alerting the P to fault conditions. These ICs monitor multiple-supply systems and derive their internal power from the highest voltage source present at VCC5 and VCC3. In addition, the output reset state is guaranteed to remain viable while either VCC5 or VCC3 is above +1V.
3 MR (5) 6 VCC5 GLITCH FILTER
Threshold Levels
All the possible input voltage threshold level combinations are indicated by a two-letter code in Voltage Threshold Levels. The two standard combinations are LS and SY. LS parts monitor one +5V 5% supply and one +3.3V 10% supply. SY parts monitor one +3.3V 10% supply and one +2.5V 10% supply. The other combinations also monitor +5V 10% supplies, +3.3V 5% supplies, and +3V 5% supplies.
Reset Outputs
The MAX6351 provides a 5V active-low reset and a 3V active-low reset. The MAX6353/MAX6356/MAX6359 provide a 5V active-low push-pull reset and the MAX6354/ MAX6357/MAX6360 provide a 3V active-low push-pull reset. The MAX6353/MAX6355/MAX6358 provide an active-low open-drain reset. The higher input voltages of VCC5 and VCC3 maintain the sinking capability of the low reset-output state. The reset outputs are maintained as long as either supply is above +1V.
VTH5 RST (1)
4 VCC3 RESET GENERATOR RST3 (5)
Negative-Going VCC Transients The MAX6351-MAX6360 are designed to ignore short negative-going VCC5 and VCC3 transients. See Typical Operating Characteristics for a glitch immunity graph. Third Input Voltage (MAX6355/MAX6356/MAX6357)
The MAX6355/MAX6356/MAX6357 provide an additional input to monitor a third voltage. The threshold voltage at RSTIN is typically 1.22V. To monitor a voltage higher than 1.22V, connect a resistor-divider to the circuit as shown in Figure 2. The threshold at V3 is: R1 + R2 V3TH = 1.22 R2 Note that RSTIN is powered by VCC5, and its voltage must therefore remain lower than VCC5.
VTH3
RST5 (1)
(5) (RSTIN)
1.22V
(5) (WDI)
WATCHDOG TIMER
V3 R1
MAX6355 MAX6356 MAX6357
RSTIN
2
GND
MAX6351-MAX6360
R2
NOTE: PIN 1 IS RST5 FOR THE MAX6351 AND RST FOR THE MAX6352-MAX6360. PIN 5 IS RST3 FOR THE MAX6351, RSTIN FOR THE MAX6355/56/57, WDI FOR THE MAX6358/59/60, AND VCC FOR THE MAX6352/53/54.
VCC5 VRSTIN
Figure 1. Functional Diagram
6
Figure 2. Monitoring a Third Voltage
_______________________________________________________________________________________
Dual/Triple-Voltage P Supervisory Circuits
Watchdog Input (MAX6358/MAX6359/MAX6360)
The MAX6358/MAX6359/MAX6360 include a WDI to provide a reset if the P goes into an infinite loop. After a reset, the start-up timeout period and the initial timeout period is nominally 46.4sec to allow the P time to initialize. After the first transition on the WDI and after any toggle of the watchdog thereafter, the timeout period is nominally 2.9sec.
Interfacing to Ps with Bidirectional Reset Pins
Microprocessors with bidirectional reset pins will contend with the push-pull outputs of these devices. To prevent this, connect a 4.7k resistor between RESET and the P's reset I/O port, as shown in Figure 5. Buffer RESET as shown in the figure if this reset is used by other components in the system.
MAX6351-MAX6360
Applications Information
Ensuring a Valid RESET Output Down to VCC = 0
In some systems, it is necessary to ensure a valid reset even if VCC falls to 0. In these applications, use the circuit shown in Figure 3. Note that this configuration does not work for the open-drain outputs of the MAX6352/ MAX6355/MAX6358.
VCC5
R1
MAX6355 MAX6356 MAX6357
RSTIN
Monitoring a Negative Voltage
To monitor a negative supply rail using RSTIN or the MAX6355/MAX6356/MAX6357, use the circuit shown in Figure 4. In this configuration, a reset is issued when the negative supply falls below VINTH.
VIN
R2
VINTH = 1.22 VCC5 VINR1
R2
R2 (V 5 - 1.22) R1 CC
VCC5 VRSTIN
Figure 4. Monitoring a Negative Voltage
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
+3.3V/+3V +5V
VCC3 VCC5
VCC5 VCC3
RST RST3 RST5 100k
VCC5 VCC3 RST 4.7k RESET
P
MAX6351-MAX6360
RST3 RST5
MAX6351-MAX6360
GND
GND
GND
Figure 3. Ensuring a Valid Reset Low to VCC5 and VCC3 = 0
Figure 5. Interfacing to Ps with Bidirectional Reset I/O
Chip Information
TRANSISTOR COUNT: 855
_______________________________________________________________________________________ 7
Dual/Triple-Voltage P Supervisory Circuits MAX6351-MAX6360
Pin Configurations
TOP VIEW
RST5 1
6
VCC5
RST* 1
5
VCC5 *MAX6352: OPEN-DRAIN OUTPUT *MAX6353: 5V PUSH-PULL OUTPUT *MAX6354: 3V PUSH-PULL OUTPUT
GND 2
MAX6351
5
RST3
GND 2
MAX6352 MAX6353 MAX6354
4 VCC3
MR 3
4
VCC3
MR 3
SOT23-6
SOT23-5
RST* 1
6
VCC5
RST* 1
6
VCC5
GND 2
MAX6355 MAX6356 MAX6357
5
RSTIN
*MAX6355: OPEN-DRAIN OUTPUT *MAX6356: 5V PUSH-PULL OUTPUT *MAX6357: 3V PUSH-PULL OUTPUT
GND 2
MAX6358 MAX6359 MAX6360
5
WDI
*MAX6358: OPEN-DRAIN OUTPUT *MAX6359: 5V PUSH-PULL OUTPUT *MAX6360: 3V PUSH-PULL OUTPUT
MR 3
4
VCC3
MR 3
4
VCC3
SOT23-6
SOT23-6
Selector Guide
PART MAX6351 MAX6352 MAX6353 MAX6354 MAX6355 MAX6356 MAX6357 MAX6358 MAX6359 MAX6360 PIN COUNT 6 5 5 5 6 6 6 6 6 6 NUMBER OF SUPPLIES MONITORED 2 2 2 2 3 3 3 2 2 2 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 5V RESET 3V RESET OPEN-DRAIN RESET -- WATCHDOG TIMER -- -- -- -- -- -- -- MANUAL RESET
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX6360

	To Download MAX6360 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .