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PDF MAX6899 Data sheet ( Hoja de datos )
| Número de pieza | MAX6899 | |
| Descripción | (MAX6895 - MAX6899) Adjustable Sequencing/Supervisory Circuits | |
| Fabricantes | Maxim Integrated Products | |
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19-3673; Rev 5; 10/07
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
General Description
The MAX6895–MAX6899 is a family of small, low-power,
voltage-monitoring circuits with sequencing capability.
These miniature devices offer tremendous flexibility with
an adjustable threshold capable of monitoring down to
0.5V and an external capacitor-adjustable time delay.
These devices are ideal for use in power-supply
sequencing, reset sequencing, and power-switching
applications. Multiple devices can be cascaded for
complex sequencing applications.
A high-impedance input with a 0.5V threshold allows an
external resistive divider to set the monitored threshold.
The output asserts (OUT = high or OUT = low) when
the input voltage rises above the 0.5V threshold and the
enable input is asserted (ENABLE = high or ENABLE =
low). When the voltage at the input falls below 0.5V or
when the enable input is deasserted (ENABLE = low or
ENABLE = high), the output deasserts (OUT = low or
OUT = high). All devices provide a capacitor-program-
mable delay time from when the input rises above 0.5V
to when the output is asserted. The MAX689_A versions
provide the same capacitor-adjustable delay from when
enable is asserted to when the output asserts. The
MAX689_P devices have a 1µs propagation delay from
when enable is asserted to when the output asserts.
The MAX6895A/P offers an active-high enable input
and an active-high push-pull output. The MAX6896A/P
offers an active-low enable input and an active-low
push-pull output. The MAX6897A/P offers an active-
high enable input and an active-high open-drain output.
Finally, the MAX6898A/P offers an active-low enable
www.DiantapSuhteeat4nUd.coamn active-low open-drain output. The
MAX6899A/P offers an active-low enable with an active-
high push-pull output.
All devices operate from a 1.5V to 5.5V supply voltage
and are fully specified over the -40°C to +125°C operat-
ing temperature range. These devices are available in
ultra-small 6-pin µDFN (1.0mm x 1.5mm) and thin
SOT23 (1.60mm x 2.90mm) packages.
Automotive
Medical Equipment
Intelligent Instruments
Portable Equipment
Applications
Computers/Servers
Critical µP Monitoring
Set-Top Boxes
Telecom
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
Features
♦ 1.8% Accurate Adjustable Threshold Over
Temperature
♦ Operate from VCC of 1.5V to 5.5V
♦ Capacitor-Adjustable Delay
♦ Active-High/-Low Enable Input Options
♦ Active-High/-Low Output Options
♦ Open-Drain (28V Tolerant)/Push-Pull Output
Options
♦ Low Supply Current (10µA, typ)
♦ Fully Specified from -40°C to +125°C
♦ Ultra-Small 6-Pin µDFN Package or Thin SOT23
Package
Ordering Information
PART
PIN-PACKAGE
TOP
MARK
PKG
CODE
MAX6895AALT+ 6 µDFN-6
MAX6895AAZT+ 6 Thin SOT23-6
+AW
+AADK
L611-1
Z6-1
MAX6895PALT+T 6 µDFN-6
MAX6895PAZT+ 6 Thin SOT23-6
+AX
+AADL
L611-1
Z6-1
MAX6896AALT+ 6 µDFN-6
MAX6896AAZT+ 6 Thin SOT23-6
+AY
+AADO
L611-1
Z6-1
MAX6896PALT+T 6 µDFN-6
MAX6896PAZT+ 6 Thin SOT23-6
+AZ
+AADP
L611-1
Z6-1
Ordering Information continued at end of data sheet.
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes a lead-free package.
T = Tape and reel.
Pin Configurations
TOP VIEW
VCC CDELAY OUT
654
MAX6895
MAX6897
MAX6899
12
3
ENABLE GND
(ENABLE)
µDFN
IN
( ) FOR MAX6899 ONLY.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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 page  
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
Pin Description
MAX6895/
MAX6897
µDFN THIN
SOT23
11
——
22
33
44
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——
56
65
PIN
MAX6896/
MAX6898
µDFN THIN
SOT23
——
11
22
33
——
44
56
65
MAX6899
µDFN THIN
SOT23
——
11
22
33
44
——
56
65
NAME
ENABLE
ENABLE
GND
IN
OUT
OUT
CDELAY
VCC
FUNCTION
Active-High Logic-Enable Input. Drive ENABLE low to
immediately deassert the output to its false state (OUT = low or
OUT = high) independent of VIN. With VIN above VTH, drive
ENABLE high to assert the output to its true state (OUT = high
or OUT = low) after the adjustable delay period (MAX689_A) or
a 150ns propagation delay (MAX689_P).
Active-Low Logic-Enable Input. Drive ENABLE high to
immediately deassert the output to its false state (OUT = low or
OUT = high) independent of VIN. With VIN above VTH, drive
ENABLE low to assert the output to its true state (OUT = high or
OUT = low) after the adjustable delay period (MAX689_A) or a
150ns propagation delay (MAX689_P).
Ground
High-Impedance Monitor Input. Connect IN to an external
resistive divider to set the desired monitored threshold. The
output changes state when VIN rises above 0.5V and when VIN
falls below 0.495V.
Active-High Sequencer/Monitor Output, Push-Pull
(MAX6895/MAX6899) or Open-Drain (MAX6897). OUT is
asserted to its true state (OUT = high) when VIN is above VTH
and the enable input is in its true state (ENABLE = high or
ENABLE = low) for the capacitor-adjusted delay period. OUT is
deasserted to its false state (OUT = low) immediately after VIN
drops below VTH - 5mV or the enable input is in its false state
(ENABLE = low or ENABLE = high). The open-drain version
requires an external pullup resistor.
Active-Low Sequencer/Monitor Output, Push-Pull (MAX6896) or
Open-Drain (MAX6898). OUT is asserted to its true state (OUT =
low) when VIN is above VTH and the enable input is in its true state
(ENABLE = high or ENABLE = low) for the CDELAY adjusted
timeout period. OUT is deasserted to its false state (OUT = high)
immediately after VIN drops below VTH - 5mV or the enable input
is in its false state (ENABLE = low or ENABLE = high). The open-
drain version requires an external pullup resistor.
Capacitor-Adjustable Delay. Connect an external capacitor
(CCDELAY) from CDELAY to GND to set the IN to OUT (and
ENABLE to OUT or ENABLE to OUT for A version devices)
delay period. tDELAY = (CCDELAY x 4.0 x 106) + 40µs. There is a
fixed short delay (40µs, typ) for the output deasserting when VIN
falls below VTH.
Supply Voltage Input. Connect a 1.5V to 5.5V supply to VCC to
power the device. For noisy systems, bypass with a 0.1µF
ceramic capacitor to GND.
_______________________________________________________________________________________ 5
5 Page 
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
Pullup Resistor Values
(MAX6897/MAX6898)
The exact value of the pullup resistors for the open-
drain outputs is not critical, but some consideration
should be made to ensure the proper logic levels when
the device is sinking current. For example, if VCC =
2.25V and the pullup voltage is 28V, you would try to
keep the sink current less than 0.5mA as shown in the
Electrical Characteristics table. As a result, the pullup
resistor should be greater than 56kΩ. For a 12V pullup,
the resistor should be larger than 24kΩ. It should be
noted that the ability to sink current is dependent on the
VCC supply voltage.
Typical Application Circuits
Figures 8, 9, 10 show typical applications for the
MAX6895–MAX6899. Figure 8 shows the MAX6895
used with a p-channel MOSFET in an overvoltage pro-
tection circuit. Figure 9 shows the MAX6895 in a low-
voltage sequencing application using an n-channel
MOSFET. Figure 10 shows the MAX6895 used in a mul-
tiple-output sequencing application.
Using an n-Channel Device for Sequencing
In higher power applications, using an n-channel device
reduces the loss across the MOSFETs as it offers a
lower drain-to-source on-resistance. However, an n-
channel MOSFET requires a sufficient VGS voltage to
fully enhance it for a low RDS_ON. The application in
Figure 9 shows the MAX6895 in a switch sequencing
application using an n-channel MOSFET.
Similarly, if a higher voltage is present in the system, the
open-drain version can be used in the same manner.
3.3V ALWAYS ON
0 TO 28V
ENABLE
VCC
R1
OUT
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MAX6897
IN
CDELAY
R2
GND
P
RPULLUP
MONITORED
3.3V
R1
R2
5V BUS 1.2V INPUT
N 1.2V OUTPUT
ENABLE
VCC
OUT
MAX6895
IN
CDELAY
GND
CCDELAY
Figure 8. Overvoltage Protection
Figure 9. Low-Voltage Sequencing Using an n-Channel MOSFET
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX6899.PDF ] | |
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