MAX6714BUB+T [MAXIM]
Power Supply Support Circuit, Adjustable, 4 Channel, BICMOS, PDSO10, 3 X 3 MM, ROHS COMPLIANT, MO-187CBA, MICRO, SOP-10;
| 型号： | MAX6714BUB+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Adjustable, 4 Channel, BICMOS, PDSO10, 3 X 3 MM, ROHS COMPLIANT, MO-187CBA, MICRO, SOP-10 |
| 文件： | 总13页 (文件大小：287K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2379; Rev 0; 4/02
Low-Voltage, High-Accuracy, Quad Voltage
Monitors in µMAX Package
General Description
Features
The MAX6709/MAX6714 quad voltage monitors provide
accurate monitoring of up to four supplies without any
external components. A variety of factory-trimmed thresh-
old voltages and supply tolerances are available to opti-
mize the MAX6709/MAX6714 for specific applications.
The selection includes input options for monitoring 5.0V,
3.3V, 3.0V, 2.5V, and 1.8V voltages. Additional high-input-
impedance comparator options can be used as
adjustable voltage monitors, general-purpose compara-
tors, or digital-level translators.
o Monitor Four Power-Supply Voltages
o Precision Factory-Set Threshold Options for 5.0V,
3.3V, 3.0V, 2.5V, and 1.8V (Nominal) Supplies
o Adjustable Voltage Threshold Monitors Down to
0.62V
o High-Accuracy ( 2.0ꢀ) Adjustable Threshold
Inputs
o Low Supply Current
MAX6709: 35µA
The MAX6709 provides four independent open-drain
outputs with 10µA internal pullup to V . The MAX6714
CC
provides an active-low, open-drain RESET output with
integrated reset timing and three power-fail comparator
outputs.
MAX6714: 60µA
o Four Independent, Active-Low, Open-Drain
Outputs with 10µA Internal Pullup to V
CC
Each of the monitored voltages is available with trip
thresholds to support power-supply tolerances of either
5% or 10% below the nominal voltage. An internal
bandgap reference ensures accurate trip thresholds
across the operating temperature range.
o 140ms (min) Reset Timeout Period
(MAX6714 only)
o 2.0V to 5.5V Supply Voltage Range
o Immune to Supply Transients
o Fully Specified from -40°C to +85°C
o Small 10-Pin µMAX Package
The MAX6709 consumes only 35µA (typ) of supply cur-
rent. The MAX6714 consumes only 60µA (typ) of supply
current. The MAX6709/MAX6714 operate with supply
voltages of 2.0V to 5.5V. An internal undervoltage lock-
out circuit forces all four digital outputs low when V
CC
drops below the minimum operating voltage. The four
digital outputs have weak internal pullups to V
accommodating wire-ORed connections. Each input
threshold voltage has an independent output. The
MAX6709/MAX6714 are available in a 10-pin µMAX
package and operate over the extended (-40°C to
+85°C) temperature range.
Ordering Information
,
CC
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
MAX6709_UB*
MAX6714_UB*
10 µMAX
*Insert the desired letter from the Selector Guide into the blank
to complete the part number.
Applications
Telecommunications
Servers
Pin Configurations
High-End Printers
TOP VIEW
Desktop and Notebook Computers
Data Storage Equipment
Networking Equipment
Multivoltage Systems
IN1
IN2
1
2
3
4
5
10
9
V
CC
PWRGD1
PWRGD2
PWRGD3
PWRGD4
MAX6709
IN3
8
IN4
7
GND
6
Typical Operating Circuits appear at end of data sheet.
Selector Guides appear at end of data sheet.
µMAX
Pin Configurations continued 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 Voltage
Monitors in µMAX Package
ABSOLUTE MAXIMUM RATINGS
All Pins to GND.........................................................-0.3V to +6V
Input/Output Current (all pins) ............................................20mA
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Continuous Power Dissipation (T = +70°C)
A
10-Pin µMAX (derate 5.6mW/°C above +70°C)..........444mW
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 (MAX6709)
(V
= 2.0V to 5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= 5V and T = +25°C.) (Note 1)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
50
UNITS
Supply Voltage Range
V
2.0
V
CC
V
V
V
= 3V
= 5V
25
35
25
CC
CC
IN_
Supply Current
I
µA
µA
CC
65
= input threshold voltage
40
Input Current
I
IN_
V
= 0 to 0.85V (for adjustable threshold)
5.0V (-5%)
0.2
4.75
4.50
3.15
3.00
2.85
2.70
2.38
2.25
1.71
1.62
0.635
IN_
4.50
4.25
3.00
2.85
2.70
2.55
2.25
2.13
1.62
1.53
0.609
4.63
4.38
3.08
2.93
2.78
2.63
2.32
2.19
1.67
1.58
0.623
5.0V (-10%)
3.3V (-5%)
3.3V (-10%)
3.0V (-5%)
Threshold Voltage
V
V
IN_ decreasing
IN_ decreasing
V
TH
TH
3.0V (-10%)
2.5V (-5%)
2.5V (-10%)
1.8V (-5%)
1.8V (-10%)
Adjustable Threshold
V
ppm/°C
%
Threshold Voltage Temperature
Coefficient
TCV
60
TH
Threshold Hysteresis
V
0.3 x V
30
HYST
TH
V
V
_ falling at 10mV/µs from
to (V - 50mV)
IN
TH
TH
Propagation Delay
t
µs
V
PD
V
V
_ rising at 10mV/µs from
to (V + 50mV)
IN
5
TH
TH
V
V
V
V
= 5V, I
= 2mA
0.3
0.3
0.3
CC
CC
CC
CC
SINK
Output Low Voltage
V
OL
= 2.5V, I
= 1.2mA
SINK
= 1V, I
= 50µA (Note 2)
SINK
≥ 2.0V, I
= 6µA (min), PWRGD_
SOURCE
Output High Voltage
V
I
0.8 x V
V
OH
CC
unasserted
V ≥ 2.0V, PWRGD_ unasserted
CC
Output High Source Current
10
µA
OH
2
_______________________________________________________________________________________
Low-Voltage, High-Accuracy Quad, Voltage
Monitors in µMAX Package
ELECTRICAL CHARACTERISTICS (MAX6714)
(V
= 2.0V to 5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at V
= 5V and T = +25°C.) (Note 1)
CC A
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
Supply Voltage Range
Supply Current (Note 3)
Power-Fail Input Current
V
2.0
V
CC
V
V
V
= 3V
= 5V
60
80
90
CC
I
µA
µA
CC
105
0.2
CC
I
= 0 to 0.85V
PFI_
PFI_
MAX6714B (-5%)
4.50
4.25
3.00
2.85
0.609
4.63
4.38
3.08
2.93
0.623
4.75
4.50
3.15
3.00
0.635
MAX6714A (-10%)
MAX6714D (-5%)
MAX6714C (-10%)
V
Reset Threshold
V
V
decreasing
V
CC
TH
CC
Power-Fail Input Threshold
Threshold Hysteresis
Reset Timeout Period
V
V
decreasing
V
PFI
PFI_
V
VPFI_ increasing relative to V
decreasing
0.3 x V
210
%
HYST
PFI_
TH
t
RP
140
280
ms
V
falling at 10mV/µs from
CC
Reset Delay
t
30
30
5
µs
µs
V
RD
(V + 100mV) to (V - 100mV)
TH
TH
V
falling at 10mV/µs from V to
TH
PFI_
(V - 50mV)
TH
Power-Fail Propagation Delay
t
PFD
V
falling at 10mV/µs from
CC
(V + 100mV) to (V - 100mV)
TH
TH
V
0.3 x V
CC
IL
MR Input Voltage
V
0.7 x V
1
IH
CC
MR Minimum Input Pulse
MR Glitch Rejection
MR to RESET Delay
MR Pullup Resistance
µs
ns
ns
kΩ
100
200
20
t
MRD
MR to V
10
50
0.3
0.3
0.3
CC
V
V
V
V
= 5V, I
= 2mA
CC
CC
CC
CC
SINK
Output Low Voltage
V
V
= 2.5V, I
= 1.2mA
OL
SINK
= 1V, I
= 50µA (Note 2)
SINK
≥ 2.0V, I
= 6mA (min), RESET,
SOURCE
Output High Voltage
V
0.8 x V
V
OH
CC
PFO_ unasserted
Output High Source Current
I
V
≥ 2.0V, RESET and PFO_ unasserted
10
µA
OH
CC
Note 1: 100% production tested at T = +25°C. Overtemperature limits guaranteed by design.
A
Note 2: Condition at V
= 1V is guaranteed only from T = 0°C to +70°C.
CC
A
Note 3: Monitored voltage 5V/3.3V is also the device supply. In the typical condition, supply current splits as follows: 25µA for the
resistor-divider, and the rest for other circuitry.
_______________________________________________________________________________________
3
Low-Voltage, High-Accuracy, Quad Voltage
Monitors in µMAX Package
Typical Operating Characteristics
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (MAX6709)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (MAX6714)
NORMALIZED THRESHOLD ERROR
vs. SUPPLY VOLTAGE (MAX6709)
50
100
90
80
70
60
50
40
30
20
10
0
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
NORMALIZED TO V = 5V
CC
45
40
35
30
25
20
15
10
5
T
= +85°C
T = +85°C
A
A
T
= +25°C
A
T
= +25°C
A
T
= -40°C
A
T
= -40°C
A
-0.01
-0.02
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
NORMALIZED PFI_ THRESHOLD
vs. TEMPERATURE (MAX6714)
NORMALIZED THRESHOLD
vs. TEMPERATURE (MAX6709)
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
0.20
0.15
0.10
0.05
0
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
200
180
160
140
120
100
80
V
= 3V OR 5V
CC
T
= +85°C
A
T
= +25°C
A
-0.05
-0.10
-0.15
-0.20
T
= -40°C
A
60
40
20
0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
0
1
2
3
4
5
6
7
8
9
10
TEMPERATURE (°C)
TEMPERATURE (°C)
SINK CURRENT (mA)
MAXIMUM TRANSIENT DURATION
vs. PFI_ OVERDRIVE (MAX6714)
MAXIMUM TRANSIENT DURATION
RESET TIMEOUT PERIOD
vs. TEMPERATURE (MAX6714)
vs. V OVERDRIVE (MAX6714)
CC
120
110
100
90
80
70
60
50
40
30
20
10
0
216
215
214
213
212
211
210
120
110
100
90
80
70
60
50
40
30
20
10
0
PFO_ ASSERTS
ABOVE THIS LINE
RESET ASSERTS
ABOVE THIS LINE
0
20
40
100
500
1000
-40
-15
10
35
60
85
0
100 200 300 400 500 600 700 800 900 1000
OVERDRIVE (mV)
PFI_ OVERDRIVE (mV)
TEMPERATURE (°C)
V
CC
4
_______________________________________________________________________________________
Low-Voltage, High-Accuracy Quad, Voltage
Monitors in µMAX Package
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
PROPAGATION DELAY
PFO_ PULLUP AND PULLDOWN RESPONSE
(WITH 100mV OVERDRIVE)
(C _ = 47pF)
PFO
MAX6709/14 toc10
MAX6709/14 toc11
IN_ (PFI_)
100mV/div
AC-COUPLED
PFI_
50mV/div
AC-COUPLED
PWRGD_ (PFO_)
2V/div
PFO_
2V/div
10µs/div
10µs/div
RESET TIMEOUT DELAY
MAX6709/14 toc12
MR
2V/div
RESET
2V/div
40ms/div
_______________________________________________________________________________________
5
Low-Voltage, High-Accuracy, Quad Voltage
Monitors in µMAX Package
Pin Description
PIN
NAME
FUNCTION
MAX6709 MAX6714
1
2
3
4
5
—
—
—
—
5
IN1
IN2
Input Voltage 1. See Selector Guide for monitored voltages.
Input Voltage 2. See Selector Guide for monitored voltages.
Input Voltage 3. See Selector Guide for monitored voltages.
Input Voltage 4. See Selector Guide for monitored voltages.
Ground
IN3
IN4
GND
Output 4. PWRGD4 asserts low when IN4 falls below its threshold voltage. PWRGD4 is open
6
7
8
9
—
—
—
—
PWRGD4
PWRGD3
PWRGD2
PWRGD1
drain with a 10µA internal pullup current source to V
.
CC
Output 3. PWRGD3 asserts low when IN3 falls below its threshold voltage. PWRGD3 is open
drain with a 10µA internal pullup current source to V
.
CC
Output 2. PWRGD2 asserts low when IN2 falls below its threshold voltage. PWRGD2 is open
drain with a 10µA internal pullup current source to V
.
CC
Output 1. PWRGD1 asserts low when IN1 falls below its threshold voltage. PWRGD1 is open
drain with a 10µA internal pullup current source to V
.
CC
Power-Supply Input. Connect V
to a 2.0V to 5.5V supply. An undervoltage lockout circuit
CC
forces all PWRGD_ outputs low when V drops below the minimum operating voltage. V
is not a monitored voltage for the MAX6709. For the MAX6714, RESET asserts low when V
CC
CC
10
10
V
CC
CC
drops below its threshold.
Manual Reset Input. Force MR low to assert the RESET output. RESET remains asserted for
the reset timeout period after MR goes high. MR is internally pulled up to V
—
—
1
2
MR
.
CC
Power-Fail Input 1. Input to noninverting input of the power-fail comparator. PFI1 is
compared to an internal 0.62V reference. Use an external resistor-divider network to adjust
the monitor threshold.
PFI1
Power-Fail Input 2. Input to noninverting input of the power-fail comparator. PFI2 is
compared to an internal 0.62V reference. Use an external resistor-divider network to adjust
the monitor threshold.
—
—
3
4
PFI2
PFI3
Power-Fail Input 3. Input to noninverting input of the power-fail comparator. PFI3 is
compared to an internal 0.62V reference. Use an external resistor-divider network to adjust
the monitor threshold.
Power-Fail Output 3. PFO3 is an active-low, open-drain output with a 10µA internal pullup to
—
—
—
6
7
8
PFO3
PFO2
PFO1
V
. PFO3 asserts low when PFI3 is below the selected threshold.
CC
Power-Fail Output 2. PFO2 is an active-low, open-drain output with a 10µA internal pullup to
. PFO2 asserts low when PFI2 is below the selected threshold.
V
CC
Power-Fail Output 1. PFO1 is an active-low, open-drain output with a 10µA internal pullup to
. PFO1 asserts low when PFI1 is below the selected threshold.
V
CC
Reset Output. RESET is an active-low, open-drain output that asserts low when V
drops
CC
below its preset threshold voltage or when a manual reset is initiated. RESET remains low for
the reset timeout period after V exceeds the selected reset threshold or MR is released.
—
9
RESET
CC
6
_______________________________________________________________________________________
Low-Voltage, High-Accuracy Quad, Voltage
Monitors in µMAX Package
flow from the external pullup voltage to V . The out-
CC
puts can be wire-ORed for a single power-good signal.
Detailed Description
The MAX6709/MAX6714 are low-power, quad voltage
monitors designed for multivoltage systems. Preset
voltage options for 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V
make these quad monitors ideal for applications such
as telecommunications, desktop and notebook comput-
ers, high-end printers, data storage equipment, and
networking equipment.
The MAX6709 quad voltage monitor includes an accu-
rate reference, four precision comparators, and a
series of internally trimmed resistor-divider networks to
set the factory-fixed threshold options. The resistor net-
works scale the specified IN_ reset voltages to match
the internal reference/comparator voltage. Adjustable
threshold options bypass the internal resistor networks
and connect directly to one of the comparator inputs
(an external resistor-divider network is required for
threshold matching). The MAX6709 monitors power
supplies with either 5% or 10% tolerance specifica-
tions, depending on the selected version. Additional
high-input-impedance comparator options can be used
The MAX6709/MAX6714 have an internally trimmed
threshold that minimizes or eliminates the need for
external components. The four open-drain outputs have
weak (10µA) internal pullups to V , allowing them to
CC
interface easily with other logic devices. The weak inter-
nal pullups can be overdriven by external pullups to any
voltage from 0 to 5.5V. Internal circuitry prevents current
V
CC
IN1
(ADJ)
PWRGD1
V
V
V
CC
CC
CC
IN2
PWRGD2
PWRGD3
PWRGD4
(3.3V/3.0V)
IN3
(2.5V/1.8V)
IN4
(ADJ)
V
CC
0.62V
REFERENCE
UNDERVOLTAGE
LOCKOUT
MAX6709
Figure 1. MAX6709 Functional Diagram
_______________________________________________________________________________________
7
Low-Voltage, High-Accuracy, Quad Voltage
Monitors in µMAX Package
V
CC
MR
RESET
TIMEOUT
(200ms)
V
CC
(5.0V/3.3V)
V
CC
PFI1
(ADJ)
PFO1
V
CC
PFI2
(ADJ)
PFO2
V
CC
PFI3
(ADJ)
PFO3
V
CC
0.62V
REFERENCE
UNDERVOLTAGE
LOCKOUT
MAX6714
Figure 2. MAX6714 Functional Diagram
as an adjustable voltage monitor, general-purpose
comparator, or digital-level translator.
Applications Information
Hysteresis
When the voltage on one comparator input is at or near
the voltage on another input, ambient noise generally
causes the comparator output to oscillate. The most
common way to eliminate this problem is through hys-
teresis. When the two comparator input voltages are
equal, hysteresis causes one comparator input voltage
to move quickly past the other, thus taking the input out
of the region where oscillation occurs. Standard com-
parators require hysteresis to be added through the
use of external resistors. The external resistive network
usually provides a positive feedback to the input in
order to cause a jump in the threshold voltage when
output toggles in one direction or the other. These
The MAX6714 quad voltage monitor/reset offers one
fixed input with internal timing for µP reset, three power-
fail comparators, and a manual reset input (MR). RESET
asserts low when V
drops below its threshold or MR is
CC
driven low. Each of the three power-fail inputs connects
directly to one of the comparator inputs.
When any input is higher than the threshold level, the
output is high. The output goes low as the input drops
below the threshold voltage. The undervoltage lockout
circuitry remains active and all outputs remain low with
V
CC
down to 1V (Figures 1 and 2).
8
_______________________________________________________________________________________
Low-Voltage, High-Accuracy Quad, Voltage
Monitors in µMAX Package
5V
5V
V
CC
IN1
IN2
V1
V2
MAX6709
V
D1
D2
D3
D4
CC
V
IN
(5V)
IN1
IN2
IN3
IN4
PWRGD1
V3
V4
IN3
IN4
MAX6709
PWRGD2
PWRGD1
PWRGD2
PWRGD3
PWRGD4
PWRGD3
PWRGD4
GND
GND
Figure 3. Quad Undervoltage Detector with LED Indicators
Figure 4. V
Bar Graph Monitoring
CC
5V
R2
V
=
1 +
V
REF
TH1
(
)
R1
PWRGD1
V
V
TH1
R2
V
= 0.62V
CC
REF
IN1
IN2
IN3
IN4
PWRGD1
R1
MAX6709
PWRGD2
OUT
INPUT
PWRGD4
V
TH4
PWRGD3
PWRGD4
R4
GND
R3
R4
R3
OUT
V
=
1 +
V
REF
TH4
(
)
∆V
TH
Figure 5. Window Detection
Figure 6. Output Response of Window Detector Circuit
resistors are not required when using the MAX6709/
MAX6714 because hysteresis is built into the device.
MAX6709/MAX6714 hysteresis is typically 0.3% of the
threshold voltage.
Window Detection
A window detector circuit uses two auxiliary inputs in a
configuration such as the one shown in Figure 5.
External resistors R1–R4 set the two threshold voltages
(V
and V
) of the window detector circuit. Window
TH4
width (∆V ) is the difference between the threshold
TH1
Undervoltage Detection Circuit
The open-drain outputs of the MAX6709/MAX6714 can
be configured to detect an undervoltage condition.
Figure 3 shows a configuration where an LED turns on
when the comparator output is low, indicating an
undervoltage condition.
TH
voltages (Figure 6).
Adjustable Input
The MAX6709 offers several monitor options with
adjustable reset thresholds. The MAX6714 has three
monitored inputs with adjustable thresholds. The thresh-
old voltage at each adjustable IN_ (PFI_) input is typically
0.62V. To monitor a voltage >0.62V, connect a resistor-
divider network to the circuit as shown in Figure 7.
The MAX6709/MAX6714 can also be used in applica-
tions such as system supervisory monitoring, multivolt-
age level detection, and V
(Figure 4).
bar graph monitoring
CC
V
INTH
= 0.62V ✕ (R1 + R2) / R2
_______________________________________________________________________________________
9
Low-Voltage, High-Accuracy, Quad Voltage
Monitors in µMAX Package
Or, solved in terms of R1:
R1 = R2 ((V
noisy environment, connecting a 0.1µF capacitor from
MR to GND provides additional noise immunity.
/ 0.62V) - 1)
INTH
Reseting the µP from a 2nd Voltage
(MAX6714)
The MAX6714 can be configured to assert a reset from a
second voltage by connecting the power-fail output to
V
INTH
manual reset. As the V
falls below its threshold, PFO
PFI_
R1
R2
goes low and asserts the reset output for the reset time-
out period after the manual reset input is deasserted.
(See Typical Operating Circuit.)
Power-Supply Bypassing and Grounding
The MAX6709/MAX6714 operate from a single 2.0V to
5.5V supply. In noisy applications, bypass V
with a
CC
0.1µF capacitor as close to V
as possible.
CC
V
= 0.62V
REF
V
INTH
0.62V
R1 = R2
- 1
(
)
V
TH_
CC
Figure 7. Setting the Auxiliary Monitor
V
V
TH_
Unused Inputs
The unused inputs (except the adjustable) are internally
connected to ground through the lower resistors of the
threshold-setting resistor pairs. The adjustable input,
however, must be connected to ground if unused.
RESET
90%
Reset Output
10%
The MAX6714 RESET output asserts low when V
CC
t
RP
t
drops below its specified threshold or MR asserts low
RD
and remains low for the reset timeout period (140ms
min) after V
exceeds its threshold and MR deasserts
CC
Figure 8. RESET Output Timing Diagram
(Figure 8). The output is open drain with a weak (10µA)
internal pullup to V . For many applications, no exter-
CC
nal pullup resistor is required to interface with other
logic devices. An external pullup resistor to any voltage
from 0 to 5.5V overdrives the internal pullup if interfac-
ing to different logic supply voltages (Figure 9). Internal
circuitry prevents reverse current flow from the external
V
= 3.3V
5V
CC
100kΩ
pullup voltage to V
.
CC
V
V
CC
CC
Manual Reset Input
Many µP-based products require manual reset capabili-
ty, 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
RESET
RESET
pullup resistor to V , so it can be left open if unused.
CC
MAX6714
Drive MR with TTL or CMOS-logic levels, or with open-
drain/collector outputs. Connect a normally open momen-
tary 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
GND
GND
Figure 9. Interfacing to Different Logic Supply Voltage
10 ______________________________________________________________________________________
Low-Voltage, High-Accuracy Quad, Voltage
Monitors in µMAX Package
Selector Guide (MAX6709)
Selector Guide (MAX6714)
NOMINAL INPUT VOLTAGE
SUPPLY
NOMINAL INPUT VOLTAGE
SUPPLY
PART
PART
IN1
(V)
IN2
(V)
IN3
(V)
IN4
(V)
V
(V)
PFI1 PFI2 PFI3
CC
TOLERANCE
(%)
TOLERANCE
(%)
(V)
(V)
(V)
MAX6709AUB
MAX6709BUB
MAX6709CUB
MAX6709DUB
MAX6709EUB
MAX6709FUB
MAX6709GUB
MAX6709HUB
MAX6709IUB
MAX6709JUB
MAX6709KUB
MAX6709LUB
MAX6709MUB
MAX6709NUB
MAX6709OUB
5
5
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3
2.5
2.5
1.8
1.8
2.5
2.5
Adj*
Adj*
Adj*
Adj*
1.8
10
5
MAX6714AUB
MAX6714BUB
MAX6714CUB
MAX6714DUB
5
Adj* Adj* Adj*
Adj* Adj* Adj*
Adj* Adj* Adj*
Adj* Adj* Adj*
10
5
5
5
10
5
3.3
3.3
10
5
5
Adj*
Adj*
5
10
5
*Adjustable voltage based on 0.62V internal threshold. External
threshold voltage can be set using an external resistor-divider.
1.8
Adj* Adj*
Adj* Adj*
10
5
Pin Configurations (continued)
5
Adj*
Adj*
Adj*
Adj*
Adj*
Adj*
2.5
2.5
1.8
1.8
Adj*
Adj*
Adj*
Adj*
10
5
TOP VIEW
10
5
MR
PFI1
PFI2
PFI3
GND
1
2
3
4
5
10
9
V
CC
RESET
PFO1
PFO2
PFO3
MAX6714
Adj* Adj*
Adj* Adj*
10
5
8
3
7
Adj* Adj* Adj* Adj*
N/A
6
*Adjustable voltage based on 0.62V internal threshold. External
threshold voltage can be set using an external resistor-divider.
µMAX
Chip Information
TRANSISTOR COUNT: 1029
PROCESS: BiCMOS
______________________________________________________________________________________ 11
Low-Voltage, High-Accuracy, Quad Voltage
Monitors in µMAX Package
Typical Operating Circuit (MAX6709)
2.0V TO 5.5V
(MAY BE ONE OF THE MONITORED VOLTAGES)
V
CC
IN1
IN2
IN3
IN4
PWRGD1
PWRGD2
PWRGD3
PWRGD4
SUPPLIES
TO BE
MONITORED
MAX6709
SYSTEM
LOGIC
µP
GND
Typical Operating Circuit (MAX6714)
3.3V
SUPPLY
5V
SUPPLY
V
CC
V
RESET
RESET
MR
CC
9V
SUPPLY
PFI1
PFI2
PFI3
MAX6714
GND
PFO1
PFO2
PFO3
µP
I/O
I/O
V
BATT
12 ______________________________________________________________________________________
Low-Voltage, High-Accuracy, Quad Voltage
Monitors in µMAX Package
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.)
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
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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