MAXIM MAX16008TP+

19-3869; Rev 1; 1/11
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
Features
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.
♦ Monitor Four Undervoltage/Overvoltage Conditions
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 30µA 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 TQFN package
and are fully specified from -40°C to +125°C.
Applications
Storage Equipment
♦ 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 -40°C to +125°C
♦ Small, 4mm x 4mm TQFN Package
Ordering Information
TEMP RANGE
PIN-PACKAGE
MAX16008TP+
PART
-40°C to +125°C
20 TQFN
MAX16009TG+
-40°C to +125°C
24 TQFN
+Denotes a lead(Pb)-free/RoHS-compliant 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
VCC
1.8V
1.5V
UVIN1
RESET
UVOUT1
VCC
RESET
μC
GND
OVIN1
OVOUT1
UVIN2
UVOUT2
Networking/Telecommunications Equipment
Multivoltage ASICs
MAX16009
Servers
OVIN2
OVOUT2
UVIN3
UVOUT3
OVIN3
OVOUT3
UVIN4
UVOUT4
OVIN4
OVOUT4
GND
Pin Configurations and Selector Guide appear at end of data
sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
MAX16008/MAX16009
General Description
MAX16008/MAX16009
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
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 = +70°C)
20-Pin Thin QFN (derate 16.9mW/°C above +70°C) ....1355mW
24-Pin Thin QFN (derate 16.9mW/°C above +70°C) ....1666mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°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.
ELECTRICAL CHARACTERISTICS
(VCC = 2.0V to 5.5V, TOL = GND, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C.)
(Note 1)
PARAMETER
Operating Voltage Range
Supply Current (Note 3)
UVLO (Undervoltage Lockout)
SYMBOL
VCC
ICC
VUVLO
CONDITIONS
(Note 2)
MIN
TYP
1.0
MAX
UNITS
5.5
V
VCC = 3.3V, outputs deasserted
45
65
VCC = 5V, outputs deasserted
45
70
1.62
1.8
1.98
V
0.388
0.394
0.400
V
VCC rising
µA
UVIN_/OVIN_
Adjustable Threshold (UVIN_
Falling/OVIN_ Rising)
UVIN_/OVIN_ Hysteresis
UVIN_/OVIN_ Input Current
VTH
VTH_HYS
UVIN_ falling/OVIN_ rising (percentage of
the threshold)
IIB
0.5
-100
% VTH
+100
nA
RESET
Reset Timeout
tRP
SRT Ramp Current
ISRT
SRT = VCC
140
200
280
CSRT = 1500pF (Note 4)
2.43
3.09
3.92
CSRT = 100pF
0.206
CSRT = open
SRT Threshold
VSRT = 0V
VTH_SRT
SRT Hysteresis
UVIN_/OVIN_ to Reset Delay
2
tRD
UVIN_ falling/OVIN_ rising
ms
0.05
460
600
740
1.173
1.235
1.293
nA
V
100
mV
20
µs
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
(VCC = 2.0V to 5.5V, TOL = GND, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V, TA = +25°C.)
(Note 1)
PARAMETER
RESET Output-Voltage Low
SYMBOL
VOL
CONDITIONS
MIN
TYP
0.30
VCC = 2.5V, ISINK = 6mA, RESET asserted
0.30
VCC = 1.2V, ISINK = 50µA, RESET asserted
RESET Output-Voltage High
VOH
MR Input-Voltage Low
VIL
MR Input-Voltage High
VIH
MAX
VCC = 3.3V, ISINK = 10mA, RESET asserted
VCC ≥ 2.0V, ISOURCE = 6µA, RESET
deasserted
V
0.7 x
VCC
µs
100
MR to RESET Delay
ns
200
12
V
V
1
MR Glitch Rejection
MR Pullup Resistance
V
0.30
0.8 x
VCC
0.3 x
VCC
MR Minimum Pulse Width
UNITS
20
ns
28
kΩ
OUTPUTS (UVOUT_/OVOUT_)
UVOUT_, OVOUT_ OutputVoltage Low
VOL
OVOUT_, OVOUT_ OutputVoltage High
VOH
UVIN_/OVIN_ to UVOUT_/ OVOUT_
Propagation Delay
tD
VCC = 3.3V, ISINK = 2mA
0.30
VCC = 2.5V, ISINK = 1.2mA
0.30
VCC ≥ 2.0V, ISOURCE = 6µA
0.8 x
VCC
(VTH - 100mV) to (VTH + 100mV)
V
V
20
µs
DIGITAL LOGIC
TOL Input-Voltage Low
VIL
TOL Input-Voltage High
VIH
TOL Input Current
0.3 x
VCC
0.7 x
VCC
V
TOL = VCC
MARGIN Input-Voltage Low
VIL
MARGIN Input-Voltage High
VIH
MARGIN Pullup Resistance
MARGIN Delay Time
100
nA
0.3 x
VCC
V
0.7 x
VCC
Pulled up to VCC
tMD
Rising or falling (Note 5)
12
V
V
20
50
28
kΩ
µs
Devices are tested at TA = +25°C 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
Note 1:
Note 2:
Note 3:
Note 4:
_______________________________________________________________________________________
3
MAX16008/MAX16009
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
45
40
35
VCC = 5V
0.425
50
45
VCC = 3.3V
40
VCC = 2.5V
0.400
0.375
35
0.350
30
30
2.5
3.0
3.5
4.0
4.5
5.0
1.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
5.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
UVIN_/OVIN_ THRESHOLD
vs. TEMPERATURE
OUTPUT VOLTAGE
vs. SINK CURRENT
MAXIMUM TRANSIENT DURATION
vs. INPUT OVERDRIVE
0.44
0.43
100
0.42
75
VOUT_ (mV)
0.41
0.40
0.39
50
0.38
25
0.37
0.36
600
OUTPUT GOES LOW
ABOVE THIS LINE
500
5.5
MAX16008 toc06
MAX16008 toc04
0.45
MAXIMUM TRANSIENT DURATION (μs)
2.0
MAX16008 toc05
1.5
400
300
200
100
UVOUT_ / OVOUT_ LOW
0.35
0
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
4
MAX16008 toc03
55
0.450
INPUT THRESHOLD
50
60
MARGIN AND MR
UNCONNECTED
MAX16008 toc02
MARGIN AND MR
UNCONNECTED
SUPPLY CURRENT (μA)
SUPPLY CURRENT (μA)
65
MAX16008 toc01
60
55
UVIN_/OVIN_ THRESHOLD
vs. SUPPLY VOLTAGE
SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
INPUT THRESHOLD
MAX16008/MAX16009
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
0
1
2
3
4
5
SINK CURRENT (mA)
6
7
8
1
10
100
INPUT OVERDRIVE (mV)
_______________________________________________________________________________________
1000
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX16008 toc07
197
RESET TIMEOUT PERIOD (ms)
RESET TIMEOUT DELAY
MAX16008 toc08
198
UVIN1
1V/div
196
195
UVOUT1
2V/div
194
193
RESET
2V/div
192
191
SRT = VCC
190
-40 -25 -10 5 20 35 50 65 80 95 110 125
40ms/div
TEMPERATURE (°C)
UVIN_ TO UVOUT_ DELAY TIME
MARGIN ENABLE FUNCTION
MAX16008 toc09
MAX16008 toc10
MARGIN
2V/div
UVIN1
2V/div
UVOUT_
2V/div
UVOUT1
2V/div
RESET
2V/div
UVIN_ BELOW RESPECTIVE THRESHOLDS
4μs/div
100μs/div
_______________________________________________________________________________________
5
MAX16008/MAX16009
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, unless otherwise noted.)
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
MAX16008/MAX16009
Pin Description
6
MAX16008
MAX16009
PIN
1
1
UVIN3
Undervoltage Threshold Input 3. When the voltage on UVIN3 falls below its threshold, UVOUT3
asserts low.
2
2
OVIN3
Overvoltage Threshold Input 3. When the voltage on OVIN3 rises above its threshold, OVOUT3
asserts low.
3
3
UVIN4
Undervoltage Threshold Input 4. When the voltage on UVIN4 falls below its threshold, UVOUT4
asserts low.
4
4
OVIN4
Overvoltage Threshold Input 4. When the voltage on OVIN4 rises above its threshold, OVOUT4
asserts low.
5
6
GND
Ground
6,
20
7,
24
VCC
Unmonitored Power to the Device
7
8
UVOUT3
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 30µA internal pullup to VCC.
8
9
OVOUT3
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 30µA internal pullup to VCC.
9
10
UVOUT4
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 30µA internal pullup to VCC.
10
11
OVOUT4
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 30µA internal pullup to VCC.
11
14
MARGIN
Active-Low Margin Enable Input. Pull MARGIN low to deassert all outputs (go into high state)
regardless of the voltage at any monitored input.
12
15
OVOUT2
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 30µA internal pullup to VCC.
NAME
FUNCTION
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
MAX16008
MAX16009
PIN
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 30µA internal pullup to VCC.
14
17
OVOUT1
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 30µA internal pullup to VCC.
15
18
UVOUT1
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 30µA internal pullup to VCC.
16
20
UVIN1
Undervoltage Threshold Input 1. When the voltage on UVIN1 falls below its threshold, UVOUT1
asserts low.
17
21
OVIN1
Overvoltage Threshold Input 1. When the voltage on OVIN1 rises above its threshold, OVOUT1
asserts low.
18
22
UVIN2
Undervoltage Threshold Input 2. When the voltages on UVIN2 falls below its threshold, UVOUT2
asserts low.
19
23
OVIN2
Overvoltage Threshold Input 2. When the voltage on OVIN2 rises above its threshold, OVOUT2
asserts low.
—
5
N.C.
Not Internally Connected
MR
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 20kΩ resistor.
SRT
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 (Ω) 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.
—
—
12
13
NAME
—
19
RESET
—
—
EP
FUNCTION
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 30µA 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.
_______________________________________________________________________________________
7
MAX16008/MAX16009
Pin Description (continued)
MAX16008/MAX16009
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
(MR)
(SRT)
VCC
VCC
TIMING
RESET CIRCUIT
(RESET)
UVIN1
UVOUT1
OVIN1
OVOUT1
UVIN2
UVOUT2
OUTPUT
DRIVER
OVOUT2
OVIN2
UVIN3
UVOUT3
OVOUT3
OVIN3
UVIN4
UVOUT4
OVOUT4
VCC
OVIN4
VCC
UNDERVOLTAGE LOCKOUT
MAX16008/
MAX16009
VCC
REFERENCE
( ) MAX16009 ONLY
MARGIN
Figure 1. Functional Diagram
8
_______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
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 30µA 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.
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.
MAX16008/MAX16009
Detailed Description
+5V
R1
VCC
UVIN_
OVOUT_
R2
OVIN_
IN
UVOUT_
MAX16008/
MAX16009
EN
OUT
DC-DC
REGULATOR
GND
R3
Figure 2. MAX16008/MAX16009 Monitor Circuit
The resistor values R1, R2, and R3 can be calculated
as shown:
⎛R
⎞
VTRIPLOW = VTH ⎜ TOTAL ⎟
2
3
R
+
R
⎝
⎠
⎛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 2MΩ. Large-value resistors help minimize power
consumption. Lower-value resistors can be used to
maintain overall accuracy.
_______________________________________________________________________________________
9
MAX16008/MAX16009
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
Use the following formulas to calculate the error:
⎛
R R ⎞
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:
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
R3 =
Any unused UVIN_ inputs must be connected to VCC, and
any unused OVIN_ inputs must be connected to GND.
VTH x R TOTAL
VTRIPHIGH
UVOUT_ / OVOUT_ Outputs
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.
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 (30µA) 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
FUSE
VSUPPLY
VSUPPLY
R1
VCC
VCC
R2
LOAD
LOAD
UVIN_
MAX16008/
MAX16009
R3*
UVOUT_
GND
MAX16008/
MAX16009
R1
R3
SCR
UVIN_
UVOUT_
R2
GND
*OPTIONAL. VALUES OF 10kΩ AND ABOVE ARE RECOMMENDED.
Figure 3. Overvoltage Shutdown Circuit (with External Pass
MOSFET)
10
Figure 4. Overvoltage Shutdown Circuit (with SCR Fuse)
______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
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 30µA internal pullup.
Reset Timeout Capacitor
The reset timeout period can be adjusted to accommodate a variety of microprocessor (µP) applications from
50µs 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 ⎠
Do not use capacitor (CSRT) values higher than 390nF.
Connect SRT to VCC for a factory-programmed reset
timeout of 140ms (min).
Manual Reset Input (MR) (MAX16009 Only)
Many µP-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
20kΩ 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 0.1µF capacitor from MR to GND provides additional noise immunity.
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_
VCC = 3.3V
VTH_ + VTH_HYS
5V
RESET
90%
100kΩ
VCC
10%
VCC
UVOUT_
tRD
tRP
UVOUT_
90%
RESET
10%
tD
tD
MAX16008/
MAX16009
VTH_
OVIN_
GND
VTH_ - VTH_HYS
GND
OVOUT_
90%
10%
tD
Figure 5. Interfacing to a Different Logic Supply Voltage
tD
Figure 6. Output Timing Diagram
______________________________________________________________________________________
11
MAX16008/MAX16009
(VOH). Resistor values of 50kΩ to 200kΩ can generally
be used.
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 0.1µF 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
NUMBER OF
MONITORED
LEVELS
UNDERVOLTAGE/
OVERVOLTAGE
THRESHOLDS
RESET
ADJUSTABLE
RESET TIMEOUT
MR
MAX16008
4
Adjustable
—
—
—
MAX16009
4
Adjustable
✔
✔
✔
PART
UVIN1 16
10 OVOUT4
OVIN1 17
9
UVOUT4
8
OVOUT3
7
UVOUT3
6
VCC
SRT
11
MARGIN
12
OVOUT2
MARGIN
13
UVOUT2
OVOUT2
14
OVOUT1
UVOUT2
15
TOP VIEW
UVOUT1
OVOUT1
TOP VIEW
UVOUT1
Pin Configurations
18
17
16
15
14
13
RESET 19
12
MR
UVIN1 20
11
OVOUT4
10
UVOUT4
9
OVOUT3
8
UVOUT3
7
VCC
OVIN1 21
UVIN2 18
MAX16008
MAX16009
UVIN2 22
OVIN2 19
OVIN2 23
VCC 20
+
+
1
2
OVIN4
GND
UVIN3
OVIN3
3
4
5
6
GND
5
N.C.
4
OVIN4
3
UVIN4
2
UVIN4
1
OVIN3
VCC 24
UVIN3
MAX16008/MAX16009
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
TQFN
4mm x 4mm
TQFN
4mm x 4mm
Package Information
For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
12
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
20 TQFN-EP
T2044+3
21-0139
90-0037
24 TQFN-EP
T2444+4
21-0139
90-0022
______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad Window
Voltage Detectors in Thin QFN
PAGES
CHANGED
REVISION
NUMBER
REVISION
DATE
0
10/05
Initial release
—
1
1/11
Added soldering temperature in the Absolute Maximum Rating section
and added symbol in Electrical Characteristics table
2
DESCRIPTION
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13
© 2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX16008/MAX16009
Revision History