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19-3869; Rev 0; 10/05
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN
General Description
The MAX16008/MAX16009 are adjustable quad window voltage detectors in a small thin QFN package. These devices are designed to provide a higher level of system reliability by monitoring multiple supply voltages and providing a fault signal when any of the voltages exceed their overvoltage thresholds or fall below their undervoltage thresholds. These devices offer user-adjustable thresholds that allow voltages to be monitored down to 0.4V. These devices allow the upper and lower trip thresholds of each window detector to be set externally with the use of three external resistors. Each monitored threshold has an independent opendrain output for signaling a fault condition. The outputs can be wire OR'ed together to provide a single fault output. The open-drain outputs are internally pulled up with a 30A current, but can be externally driven to other voltage levels for interfacing to other logic levels. Both devices feature a margin input to disable the outputs during margin testing or any other time after power-up operations. The MAX16009 offers a reset output that deasserts after a reset timeout period after all voltages are within their threshold specifications. The reset timeout is internally set to 140ms (min), but can be externally adjusted to other reset timeouts using an external capacitor. In addition, the MAX16009 offers a manual reset input. All devices are offered in a 4mm x 4mm thin QFN package and are fully specified from -40C to +125C. 1.5% Accuracy Over Temperature User-Adjustable Thresholds (Down to 0.4V) Open-Drain Outputs with Internal Pullups Reduce the Number of External Components Manual Reset Input (MAX16009) Margin Enable Input Fixed or Adjustable RESET Timeout (MAX16009) Guaranteed Correct Output Logic State Down to VCC = 1V Fully Specified from -40C to +125C Small, 4mm x 4mm Thin QFN Package
Features
Monitor Four Undervoltage/Overvoltage Conditions
MAX16008/MAX16009
Ordering Information
PART MAX16008TP+ TEMP RANGE PINPACKAGE PKG CODE T2044-3
-40C to +125C 20 Thin QFN
MAX16009TG+ -40C to +125C 24 Thin QFN T2444-4 +Denotes lead-free package. For tape-and-reel, add a "T" after the "+." Tape-and-reel are offered in 2.5k increments.
Typical Operating Circuit
3.5V 2.5V 1.8V 1.5V UVIN1 VCC RESET UVOUT1 VCC RESET C GND
Applications
Storage Equipment Networking/Telecommunications Equipment Multivoltage ASICs Servers
OVIN1
OVOUT1
UVIN2
UVOUT2 MAX16009
OVIN2
OVOUT2
UVIN3
UVOUT3
OVIN3
OVOUT3
UVIN4
UVOUT4
OVIN4 GND
OVOUT4
Pin Configurations and Selector Guide appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN MAX16008/MAX16009
ABSOLUTE MAXIMUM RATINGS
VCC, OVOUT_, UVOUT_, RESET, UVIN_, OVIN_ to GND .........................................-0.3V to +6V MARGIN, MR, TOL, SRT to GND................-0.3V to (VCC + 0.3V) Input/Output Current (RESET, MARGIN, SRT, MR, UVOUT_, OVOUT_) .......20mA Continuous Power Dissipation (TA = +70C) 20-Pin Thin QFN (derate 16.9mW/C above +70C) ....1355mW 24-Pin Thin QFN (derate 16.9mW/C above +70C) ....1666mW Operating Temperature Range .........................-40C to +125C Junction Temperature .....................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+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
(VCC = 2.0V to 5.5V, TOL = GND, TA = -40C to +125C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25C.) (Note 1)
PARAMETER Operating Voltage Range Supply Current (Note 3) UVLO (Undervoltage Lockout) UVIN_/OVIN_ Adjustable Threshold (UVIN_ Falling/OVIN_ Rising) UVIN_/OVIN_ Hysteresis UVIN_/OVIN_ Input Current RESET SRT = VCC Reset Timeout tRP CSRT = 1500pF (Note 4) CSRT = 100pF CSRT = open SRT Ramp Current SRT Threshold SRT Hysteresis UVIN_/OVIN_ to Reset Delay tRD UVIN_ falling/OVIN_ rising ISRT VSRT = 0 460 1.173 140 2.43 200 3.09 0.206 0.05 600 1.235 100 20 740 1.293 nA V mV s 280 3.92 ms VTH VTH_HYS IIB UVIN_ falling/OVIN_ rising (percentage of the threshold) -100 0.388 0.394 0.5 +100 0.400 V % VTH nA SYMBOL VCC ICC VUVLO (Note 2) VCC = 3.3V, outputs deasserted VCC = 5V, outputs deasserted VCC rising 1.62 CONDITIONS MIN 1.0 45 45 1.8 TYP MAX 5.5 65 70 1.98 UNITS V A V
2
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Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.0V to 5.5V, TOL = GND, TA = -40C to +125C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25C.) (Note 1)
PARAMETER RESET Output-Voltage Low SYMBOL VOL CONDITIONS VCC = 3.3V, ISINK = 10mA, RESET asserted VCC = 2.5V, ISINK = 6mA, RESET asserted VCC = 1.2V, ISINK = 50A, RESET asserted RESET Output-Voltage High MR Input-Voltage Low MR Input-Voltage High MR Minimum Pulse Width MR Glitch Rejection MR to RESET Delay MR Pullup Resistance OUTPUTS (UVOUT_/OVOUT_) UVOUT_, OVOUT_ OutputVoltage Low OVOUT_, OVOUT_ OutputVoltage High UVIN_/OVIN_ to UVOUT_/ OVOUT_ Propagation Delay DIGITAL LOGIC TOL Input-Voltage Low TOL Input-Voltage High TOL Input Current MARGIN Input-Voltage Low MARGIN Input-Voltage High MARGIN Pullup Resistance MARGIN Delay Time tMD VIL VIH Pulled up to VCC Rising or falling (Note 5) 0.7 x VCC 12 20 50 28 VIL VIH TOL = VCC 0.7 x VCC 100 0.3 x VCC 0.3 x VCC V V nA V V k s VOL VOH tD VCC = 3.3V, ISINK = 2mA VCC = 2.5V, ISINK = 1.2mA VCC 2.0V, ISOURCE = 6A (VTH - 100mV) to (VTH + 100mV) 0.8 x VCC 20 0.30 0.30 V V s 12 VOH VIL VIH 0.7 x VCC 1 100 200 20 28 VCC 2.0V, ISOURCE = 6A, RESET deasserted 0.8 x VCC 0.3 x VCC MIN TYP MAX 0.30 0.30 0.30 V V V s ns ns k V UNITS
MAX16008/MAX16009
Note 1: Note 2: Note 3: Note 4:
Devices are tested at TA = +25C and guaranteed by design for TA = TMIN to TMAX. The outputs are guaranteed to be in the correct logic state down to VCC = 1V. Measured with MR and MARGIN unconnected. The minimum and maximum specifications for this parameter are guaranteed by using the worse case of the SRT current and SRT threshold specifications. Do not set the reset timeout period to more than 1.12s. Note 5: Amount of time required for logic to lock/unlock outputs from margin testing
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3
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN MAX16008/MAX16009
Typical Operating Characteristics
(VCC = 3.3V, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16008 toc01
SUPPLY CURRENT vs. TEMPERATURE
MARGIN AND MR UNCONNECTED VCC = 5V
MAX16008 toc02
UVIN_/OVIN_ THRESHOLD vs. SUPPLY VOLTAGE
MAX16008 toc03
60 55 SUPPLY CURRENT (A) 50 45 40 35 30 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 MARGIN AND MR UNCONNECTED
65 60 SUPPLY CURRENT (A) 55 50 45 VCC = 3.3V 40 35 30 VCC = 2.5V
0.450
0.425 INPUT THRESHOLD
0.400
0.375
0.350 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V)
5.5
SUPPLY VOLTAGE (V)
UVIN_/OVIN_ THRESHOLD vs. TEMPERATURE
MAX16008 toc04
OUTPUT VOLTAGE vs. SINK CURRENT
MAXIMUM TRANSIENT DURATION (s) 100
MAX16008 toc05
MAXIMUM TRANSIENT DURATION vs. INPUT OVERDRIVE
OUTPUT GOES LOW ABOVE THIS LINE
MAX16008 toc06
0.45 0.44 0.43 INPUT THRESHOLD 0.42
600 500 400 300 200 100 0
75 VOUT_ (mV)
0.41 0.40 0.39 0.38 0.37 0.36 0.35 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
50
25 UVOUT_ / OVOUT_ LOW 0 0 1 2 3 4 5 6 7 8 SINK CURRENT (mA)
1
10
100
1000
INPUT OVERDRIVE (mV)
4
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Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25C, unless otherwise noted.)
MAX16008/MAX16009
RESET TIMEOUT PERIOD vs. TEMPERATURE
197 RESET TIMEOUT PERIOD (ms) 196 195 194 193 192 191 190 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
MAX16008 toc07
RESET TIMEOUT DELAY
MAX16008 toc08
198
UVIN1 1V/div
UVOUT1 2V/div
RESET 2V/div SRT = VCC 40ms/div
UVIN_ TO UVOUT_ DELAY TIME
MAX16008 toc09
MARGIN ENABLE FUNCTION
MAX16008 toc10
UVIN1 2V/div
MARGIN 2V/div
UVOUT_ 2V/div UVOUT1 2V/div
RESET 2V/div UVIN_ BELOW RESPECTIVE THRESHOLDS
4s/div
100s/div
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5
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN MAX16008/MAX16009
Pin Description
PIN MAX16008 MAX16009 NAME FUNCTION
1 2 3 4 5 6, 20 7
1 2 3 4 6 7, 24 8
UVIN3 OVIN3 UVIN4 OVIN4 GND VCC
Undervoltage Threshold Input 3. When the voltage on UVIN3 falls below its threshold, UVOUT3 asserts low. Overvoltage Threshold Input 3. When the voltage on OVIN3 rises above its threshold, OVOUT3 asserts low. Undervoltage Threshold Input 4. When the voltage on UVIN4 falls below its threshold, UVOUT4 asserts low. Overvoltage Threshold Input 4. When the voltage on OVIN4 rises above its threshold, OVOUT4 asserts low. Ground Unmonitored Power to the Device Active-Low Undervoltage Output 3. When the voltage at UVIN3 falls below its threshold, UVOUT3 asserts low and stays asserted until the voltage at UVIN3 exceeds its threshold. The open-drain output has a 30A internal pullup to VCC. Active-Low Overvoltage Output 3. When the voltage at OVIN3 rises above its threshold, OVOUT3 asserts low and stays asserted until the voltage at OVIN3 falls below its threshold. The open-drain output has a 30A internal pullup to VCC. Active-Low Undervoltage Output 4. When the voltage at UVIN4 falls below its threshold, UVOUT4 asserts low and stays asserted until the voltage at UVIN4 exceeds its threshold. The open-drain output has a 30A internal pullup to VCC. Active-Low Overvoltage Output 4. When the voltage at OVIN4 rises above its threshold, OVOUT4 asserts low and stays asserted until the voltage at OVIN4 falls below its threshold. The open-drain output has a 30A internal pullup to VCC. Active-Low Margin Enable Input. Pull MARGIN low to deassert all outputs (go into high state) regardless of the voltage at any monitored input. Active-Low Overvoltage Output 2. When the voltage at OVIN2 rises above its threshold, OVOUT2 asserts low and stays asserted until the voltage at OVIN2 falls below its threshold. The open-drain output has a 30A internal pullup to VCC.
UVOUT3
8
9
OVOUT3
9
10
UVOUT4
10
11
OVOUT4
11
14
MARGIN
12
15
OVOUT2
6
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Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN
Pin Description (continued)
PIN MAX16008 MAX16009 NAME FUNCTION
MAX16008/MAX16009
13
16
UVOUT2
Active-Low Undervoltage Output 2. When the voltage at UVIN2 falls below its threshold, UVOUT2 asserts low and stays asserted until the voltage at UVIN2 exceeds its threshold. The open-drain output has a 30A internal pullup to VCC. Active-Low Overvoltage Output 1. When the voltage at OVIN1 rises above its threshold, OVOUT1 asserts low and stays asserted until the voltage at OVIN1 falls below its threshold. The open-drain output has a 30A internal pullup to VCC. Active-Low Undervoltage Output 1. When the voltage at UVIN1 falls below its threshold, UVOUT1 asserts low and stays asserted until the voltage at UVIN1 exceeds its threshold. The open-drain output has a 30A internal pullup to VCC. Undervoltage Threshold Input 1. When the voltage on UVIN1 falls below its threshold, UVOUT1 asserts low. Overvoltage Threshold Input 1. When the voltage on OVIN1 rises above its threshold, OVOUT1 asserts low. Undervoltage Threshold Input 2. When the voltages on UVIN2 falls below its threshold, UVOUT2 asserts low. Overvoltage Threshold Input 2. When the voltage on OVIN2 rises above its threshold, OVOUT2 asserts low. Not Internally Connected Active-Low Manual Reset Input. Pull MR low to assert RESET low. RESET remains low for the reset timeout period after MR is deasserted. MR is pulled up to VCC through a 20k resistor. Set Reset Timeout Input. Connect a capacitor from SRT to GND to set the reset timeout period. The reset timeout period can be calculated as follows: Reset Timeout (s) = 2.06 x 106 () x CSRT (F). Do not set the reset timeout period to more than 1.12s. For the internal timeout period of 140ms (min), connect SRT to VCC. Active-Low Reset Output. RESET asserts low when the voltage on any of the UVIN_ inputs falls below their respective thresholds, the voltage on any of the OVIN_ inputs goes above its respective threshold, or MR is asserted. RESET remains asserted for at least the minimum reset timeout after all monitored UVIN_ inputs exceed their respective thresholds, all OVIN_ inputs fall below their respective thresholds, and MR is deasserted. This open-drain output has a 30A internal pullup. Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal resistance path from the IC junction to the PC board. Do not use as the only electrical connection to GND.
14
17
OVOUT1
15
18
UVOUT1
16 17 18 19 -- --
20 21 22 23 5 12
UVIN1 OVIN1 UVIN2 OVIN2 N.C. MR
--
13
SRT
--
19
RESET
EP
EP
EP
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7
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN MAX16008/MAX16009
(MR) (SRT) VCC VCC TIMING RESET CIRCUIT UVIN1 (RESET)
UVOUT1
OVIN1 OVOUT1 UVIN2
UVOUT2 OUTPUT DRIVER
OVIN2
OVOUT2
UVIN3
UVOUT3
OVOUT3 OVIN3
UVIN4 UVOUT4
OVOUT4 OVIN4 VCC UNDERVOLTAGE LOCKOUT REFERENCE VCC VCC MAX16008/ MAX16009
( ) MAX16009 ONLY
MARGIN
Figure 1. Functional Diagram 8 _______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN
Detailed Description
The MAX16008/MAX16009 are adjustable quad window voltage detectors in a small thin QFN package. These devices are designed to provide a higher level of system reliability by monitoring multiple supply voltages and providing a fault signal when any of the voltages exceeds its overvoltage threshold or falls below its undervoltage threshold. These devices offer user-adjustable thresholds that allow voltages to be monitored down to 0.4V. The devices allow the upper and lower trip thresholds of each window detector to be set externally with the use of three external resistors. Each monitored threshold has an independent opendrain output for signaling a fault condition. The outputs can be wire OR'ed together to provide a single fault output. The open-drain outputs are internally pulled up with a 30A current, but can be externally driven to other voltage levels for interfacing to other logic levels. Both devices feature a margin input to disable the outputs during margin testing or any other time after power-up operations. The MAX16009 offers a reset output that deasserts after a reset timeout period after all voltages are within their threshold specification. The reset timeout is internally set to 140ms (min), but can be externally adjusted to other reset timeouts using an external capacitor. In addition, the MAX16009 offers a manual reset input.
+5V R1 UVIN_ R2 OVIN_ R3 MAX16008/ MAX16009 VCC UVOUT_ OVOUT_ EN IN OUT DC-DC REGULATOR GND
MAX16008/MAX16009
Figure 2. MAX16008/MAX16009 Monitor Circuit
The resistor values R1, R2, and R3 can be calculated as shown: R VTRIPLOW = VTH TOTAL R2 + R 3 R VTRIPHIGH = VTH TOTAL R3 where RTOTAL = R1 + R2 + R3. Use the following steps to determine the values for R1, R2, and R3: 1) Choose a value for RTOTAL, the sum of R1, R2, and R3. Because the MAX16008/MAX16009 have very low input bias current (2nA typ), RTOTAL can be up to 2M. Large-value resistors help minimize power consumption. Lower-value resistors can be used to maintain overall accuracy.
Applications Information
Voltage Monitoring
The MAX16008/MAX16009 feature undervoltage and overvoltage comparators for window detection (see Figure 2). UVOUT_/OVOUT_ deassert high when the monitored voltage is within the "selected window." When the monitored voltage falls below the lower limit of the window (VTRIPLOW), UVOUT_ asserts low; or if the monitored voltage exceeds the upper limit (VTRIPHIGH), OVOUT_ asserts low. The application in Figure 2 shows the MAX16008/MAX16009 enabling the DC-DC converter when the monitored voltage is in the selected window.
_______________________________________________________________________________________
9
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN MAX16008/MAX16009
Use the following formulas to calculate the error: RR IIB R1 + 1 3 R2 + R3 EUV (%) = x 100 VTRIPLOW I (R + (2 x R1)) x 100 EOV (%) = IB 2 VTRIPHIGH where EUV and EOV are the undervoltage and overvoltage error (in %), respectively. 2) Calculate R3 based on RTOTAL and the desired upper trip point: R3 = VTH x R TOTAL VTRIPHIGH The MAX16008/MAX16009 are powered directly from the system voltage supply. Select R1 and R2 to set the trip voltage. When the supply voltage remains below the selected threshold, a low logic level on UVOUT_ turns on the p-channel MOSFET. In the case of an overvoltage event, UVOUT_ goes high turning off the MOSFET, and shuts down the power to the load. Figure 4 shows a similar application using a fuse and a silicon-controlled rectifier (SCR). An overvoltage event turns on the SCR and shorts the supply to ground. The surge of current through the short circuit blows the fuse and terminates the current to the load. Select R3 so that the gate of the SCR is properly biased when UVOUT_ goes high.
Unused Inputs
Any unused UVIN_ inputs must be connected to VCC, and any unused OVIN_ inputs must be connected to GND.
UVOUT_/OVOUT_ Outputs
UVOUT_ and OVOUT_ outputs assert low when UVIN_ and OVIN_, respectively, drop below or exceed their specified thresholds. The undervoltage/overvoltage outputs are open-drain with a (30A) internal pullup to VCC. For many applications, no external pullup resistor is required to interface with other logic devices. An external pullup resistor to any voltage up to 5.5V overdrives the internal pullup if interfacing to different logic supply voltages. Internal circuitry prevents reverse current flow from the external pullup voltage to VCC (Figure 5). When choosing the external pullup resistor, the resistance value should be large enough to ensure that the output can sink the necessary current during a logic-low condition and small enough to be able to overdrive the internal pullup current and meet output high specifications
3) Calculate R2 based on R TOTAL , R3, and the desired lower trip point: R2 = VTH x R TOTAL - R3 VTRIPLOW
4) Calculate R1 based on RTOTAL, R3, and R2: R1 = R TOTAL - R2 - R 3
Overvoltage Shutdown
The MAX16008/MAX16009 are ideal for overvoltageshutdown applications. Figure 3 shows a typical circuit for this application using a pass p-channel MOSFET.
VSUPPLY R1 UVIN_ R2 MAX16008/ MAX16009 UVOUT_ GND R3* VCC LOAD
FUSE VSUPPLY VCC MAX16008/ MAX16009 UVIN_ UVOUT_ R2 GND R3 SCR
LOAD
R1
*OPTIONAL. VALUES OF 10k AND ABOVE ARE RECOMMENDED.
Figure 3. Overvoltage Shutdown Circuit (with External Pass MOSFET) 10
Figure 4. Overvoltage Shutdown Circuit (with SCR Fuse)
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Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN
(VOH). Resistor values of 50k to 200k can generally be used.
RESET Output (MAX16009 Only)
RESET asserts low when the voltage on any of the UVIN_ inputs falls below its respective threshold, the voltage on any of the OVIN_ inputs goes above its respective threshold, or MR is asserted. RESET remains asserted for the reset timeout period after all monitored UVIN_ inputs exceed their respective thresholds, all OVIN_ inputs fall below their respective thresholds, and MR is deasserted (see Figure 6). This open-drain output has a 30A internal pullup.
Do not use capacitor (CSRT) values higher than 390nF. Connect SRT to VCC for a factory-programmed reset timeout of 140ms (min).
MAX16008/MAX16009
Manual Reset Input (MR) (MAX16009 Only)
Many P-based products require manual reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic-low on MR asserts RESET low. RESET remains asserted while MR is low, and during the reset timeout period (140ms min) after MR returns high. The MR input has an internal 20k pullup resistor to VCC, so it can be left open if it is not used. MR can be driven with TTL or CMOS-logic levels, or with open-drain/collector outputs. Connect a normally open momentary switch from MR to GND to create a manual reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1F capacitor from MR to GND provides additional noise immunity.
Reset Timeout Capacitor
The reset timeout period can be adjusted to accommodate a variety of microprocessor (P) applications from 50s to 1.12s. Adjust the reset timeout period (tRP) by connecting a capacitor (CSRT) between SRT and GND. Calculate the reset timeout capacitor as follows: tRP (s) CSRT (F) = VTH _ SRT I SRT
Margin Output Disable (MARGIN)
MARGIN allows system-level testing while power supplies are adjusted from their nominal voltages. Drive MARGIN low to deassert all outputs (UVOUT_,
UVIN_ VTH_
VTH_ + VTH_HYS
VCC = 3.3V
5V
RESET
90% 10%
100k VCC VCC
tRD
tRP
UVOUT_
UVOUT_
RESET
10% tD tD
90%
MAX16008/ MAX16009
VTH_ OVIN_ VTH_ - VTH_HYS
GND
GND
OVOUT_ 90% 10% tD tD
Figure 5. Interfacing to a Different Logic Supply Voltage
Figure 6. Output Timing Diagram 11
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Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN MAX16008/MAX16009
OVOUT_, and RESET) regardless of the voltage at any monitored input. The state of each output does not change while MARGIN = GND. While MARGIN is low, the IC continues to monitor all voltages. When MARGIN is deasserted, the outputs go to their monitored states after a short propagation delay. The MARGIN input is internally pulled up to VCC. Leave unconnected or connect to VCC if unused.
Power-Supply Bypassing
The MAX16008/MAX16009 operate from a 2.0V to 5.5V supply. An undervoltage lockout ensures that the outputs are in the correct states when the UVLO is exceeded. In noisy applications, bypass VCC to ground with a 0.1F capacitor as close to the device as possible. In addition, the additional capacitor improves transient immunity. For fast-rising VCC transients, additional capacitance may be required.
Selector Guide
PART MAX16008 MAX16009 NUMBER OF MONITORED LEVELS 4 4 UNDERVOLTAGE/ OVERVOLTAGE THRESHOLDS Adjustable Adjustable RESET -- ADJUSTABLE RESET TIMEOUT -- MR --
Pin Configurations
MARGIN UVOUT1 OVOUT1 UVOUT2 OVOUT2
15 UVIN1 16 OVIN1 17 UVIN2 18 OVIN2 19 VCC 20 +
14
13
12
11 RESET 19 10 OVOUT4 UVIN1 20 9 UVOUT4 OVIN1 21
18
17
16
15
14
13 12 11 10 MR OVOUT4 UVOUT4 OVOUT3 UVOUT3 VCC
MAX16008
8 7 6
OVOUT3 UVIN2 22 UVOUT3 OVIN2 23 VCC VCC 24 1 UVIN3 +
MAX16009
SRT 9 8 7 6 GND
TOP VIEW
TOP VIEW
1 UVIN3
2 OVIN3
3 UVIN4
4 OVIN4
5 GND
2 OVIN3
3 UVIN4
4 OVIN4
THIN QFN 4mm x 4mm
THIN QFN 4mm x 4mm
12
______________________________________________________________________________________
N.C.
MARGIN 5
UVOUT1
OVOUT1
UVOUT2
OVOUT2
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
MAX16008/MAX16009
PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
1
2
______________________________________________________________________________________
24L QFN THIN.EPS
13
Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN MAX16008/MAX16009
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm
21-0139
E
2
2
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

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