Maxim MAX6895 Ultra-small, adjustable sequencing/supervisory circuit Datasheet

19-3673; Rev 7; 7/10
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
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-programmable 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 activehigh enable input and an active-high open-drain output.
Finally, the MAX6898A/P offers an active-low enable
input and an active-low open-drain output. The
MAX6899A/P offers an active-low enable with an activehigh 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 operating 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.
Features
o 1.8% Accurate Adjustable Threshold Over
Temperature
o Operate from VCC of 1.5V to 5.5V
o Capacitor-Adjustable Delay
o Active-High/-Low Enable Input Options
o Active-High/-Low Output Options
o Open-Drain (28V Tolerant)/Push-Pull Output
Options
o Low Supply Current (10µA, typ)
o Fully Specified from -40°C to +125°C
o Ultra-Small 6-Pin µDFN Package or Thin SOT23
Package
Ordering Information
PART
PIN-PACKAGE
MAX6895AALT+
6 µDFN
6 Thin SOT23
MAX6895AAZT+
MAX6895PALT+T
MAX6895PAZT+
MAX6896AALT+
MAX6896AAZT+
MAX6896PALT+T
Computers/Servers
Medical Equipment
Critical µP Monitoring
Intelligent Instruments
Set-Top Boxes
Portable Equipment
Telecom
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
+AADK
+AX
6 µDFN
6 Thin SOT23
+AADL
6 µDFN
6 Thin SOT23
+AADO
+AY
+AZ
6 µDFN
6 Thin SOT23
MAX6896PAZT+
+AADP
Ordering Information continued at end of data sheet.
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations
TOP VIEW
VCC
CDELAY
OUT
6
5
4
Applications
Automotive
TOP MARK
+AW
MAX6895
MAX6897
MAX6899
1
2
3
ENABLE
(ENABLE)
GND
IN
µDFN
( ) FOR MAX6899 ONLY.
Pin Configurations continued 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
MAX6895–MAX6899
General Description
MAX6895–MAX6899
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
VCC, ENABLE, ENABLE, IN....................................-0.3V to +6V
OUT, OUT (push-pull) ................................-0.3V to (VCC + 0.3V)
OUT, OUT (open-drain)..........................................-0.3V to +30V
CDELAY......................................................-0.3V to (VCC + 0.3V)
Output Current (all pins) ...................................................±20mA
Continuous Power Dissipation (TA = +70°C)
6-Pin µDFN (derate 2.1mW/°C above +70°C)...........167.7mW
6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ...727.3mW
Package Junction-to-Ambient Thermal Resistance (θJA) (Note 1)
6-Pin µDFN ..................................................................477°C/W
6-Pin Thin SOT23 ........................................................110°C/W
Package Junction-to-Case Thermal Resistance (θJC) (Note 1)
6-Pin Thin SOT23 ..........................................................50°C/W
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four
layer board. For detailed information on package thermal considerations refer to www.maxim-ic.com/thermal-tutorial.
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 = 1.5V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25°C, unless
otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SUPPLY
Operating Voltage Range
Undervoltage Lockout (Note 3)
VCC Supply Current
VCC
UVLO
VCC falling
ICC
VCC = 3.3V, no load
VTH
VIN rising, 1.5V < VCC < 5.5V
1.5
5.5
V
1.20
1.35
V
10
20
µA
0.5
0.509
V
IN
Threshold Voltage
Hysteresis
Input Current (Note 4)
VHYST
IIN
0.491
VIN falling
5
VIN = 0V or VCC
-15
200
CDELAY rising
0.95
130
mV
+15
nA
250
300
nA
1.00
1.05
V
500
Ω
0.4
V
+100
nA
CDELAY
Delay Charge Current
Delay Threshold
CDELAY Pulldown Resistance
ICD
VTCD
RCDELAY
ENABLE/ENABLE
Input Low Voltage
Input High Voltage
Input Leakage Current
2
VIL
VIH
ILEAK
1.4
ENABLE, ENABLE = VCC or GND
-100
_______________________________________________________________________________________
V
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
(VCC = 1.5V to 5.5V, TA = -40°C to +125°C, unless otherwise specified. Typical values are at VCC = 3.3V and TA = +25°C, unless
otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
OUT/OUT
Output Low Voltage (Open-Drain
or Push-Pull)
VOL
VCC ≥ 1.2V, ISINK = 90µA,
MAX6895/MAX6897/MAX6899 only
0.3
VCC ≥ 2.25V, ISINK = 0.5mA
0.3
VCC ≥ 4.5V, ISINK = 1mA
Output High Voltage (Push-Pull)
Output Open-Drain Leakage
Current
ILKG
0.4
VCC ≥ 2.25V, ISOURCE = 500µA
0.8 x
VCC
VCC ≥ 4.5V, ISOURCE = 800µA
0.8 x
VCC
VOH
V
V
Output high impedance, VOUT = 28V
1
µA
TIMING
IN to OUT/OUT Propagation
Delay
tDELAY
VIN rising
tDL
VIN falling
CCDELAY = 0µF
40
µs
CCDELAY = 0.047µF
190
ms
16
µs
2
ms
Startup Delay (Note 5)
ENABLE/ENABLE Minimum Input
Pulse Width
tPW
1
ENABLE/ENABLE Glitch
Rejection
ENABLE/ENABLE to OUT/OUT
Delay
tOFF
tPROPP
ENABLE/ENABLE to OUT/OUT
Delay
tPROPA
From device enabled to device disabled
From device disabled to device enabled
(P version)
From device disabled CCDELAY = 0µF
to device enabled
CCDELAY = 0.047µF
(A version)
µs
100
ns
150
ns
150
ns
20
µs
190
ms
Note 2: All devices are production tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 3: When VCC falls below the UVLO threshold, the outputs will deassert (OUT goes low, OUT goes high). When VCC falls below
1.2V, the out annot be determined.
Note 4: Guaranteed by design.
Note 5: During the initial power-up, VCC must exceed 1.5V for at least 2ms before the output is guaranteed to be in the correct state.
_______________________________________________________________________________________
3
MAX6895–MAX6899
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VCC = 3.3V and TA = +25°C, unless otherwise noted.)
0.5008
0.5006
0.5004
14
VTH (V)
12
VCC = 3V
10
8
0.5002
0.5000
0.4998
VCC = 1.5V
6
0.4996
4
0.4994
2
0.4992
0.4990
0
-40 -25 -10 5 20 35 50 65 80 95 110 125
-40 -25 -10 5 20 35 50 65 80 95 110 125
VCC (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
OUT DELAY
vs. CCDELAY
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
4000
VCC = 1.5V
1.2
3500
VCC = 3V
2500
2000
VCC = 5V
4.5
4.0
3.5
VCC = 5V
0.9
VOH (V)
VOL (V)
3000
5.0
MAX6895 toc05
1.5
MAX6895 toc04
4500
VCC = 3V
3.0
2.5
2.0
0.6
VCC = 1.5V
1.5
1500
1000
1.0
0.3
0.5
500
0
0
0
0 100 200 300 400 500 600 700 800 900 1000
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
2
4
6
8
10 12 14 16 18 20
CCDELAY (nF)
ISINK (mA)
ISOURCE (mA)
MAXIMUM TRANSIENT DURATION
vs. INPUT OVERDRIVE
ENABLE TURN-ON/OFF (MAX6896P)
ENABLE TURN-ON/OFF DELAY
(MAX6895A)
MAX6895 toc08
MAX6895 toc09
MAX6895 toc07
600
500
400
VOUT
2V/div
VOUT
2V/div
VENABLE
2V/div
VENABLE
2V/div
300
RESET
OCCURS
200
100
0
0
10 20 30 40 50 60 70 80 90 100
100ns/div
40ms/div
VOVERDRIVE (mV)
4
MAX6895 toc06
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
5000
tDELAY (ms)
VCC = 5V
MAX6895 toc03
18
16
0.5010
MAX6895 toc02
20
MAX6895 toc01
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
IN THRESHOLD
vs. TEMPERATURE
SUPPLY CURRENT
vs. TEMPERATURE
ICC (µA)
ICC (µA)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAXIMUM TRANSIENT DURATION (µs)
MAX6895–MAX6899
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
_______________________________________________________________________________________
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
PIN
MAX6895/
MAX6897
µDFN
1
THIN
SOT23
1
MAX6896/
MAX6898
µDFN
—
THIN
SOT23
—
MAX6899
µDFN
—
NAME
—
ENABLE
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).
—
—
1
1
1
1
ENABLE
2
2
2
2
2
2
GND
3
3
3
3
3
FUNCTION
THIN
SOT23
3
IN
4
4
—
—
4
4
OUT
—
—
4
4
—
—
OUT
5
6
5
6
5
6
CDELAY
6
5
6
5
6
5
VCC
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) after 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 opendrain 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)
6
delay period. tDELAY = (CCDELAY x 4.0 x 10 ) + 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
MAX6895–MAX6899
Pin Description
MAX6895–MAX6899
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
Table 1. MAX6895/MAX6897 Output
ENABLE (MAX6895)
ENABLE (MAX6899)
VCC
IN
LOGIC
0.5V
IN
ENABLE
VIN < VTH
Low
Low
OUT
VIN < VTH
High
Low
VIN > VTH
Low
Low
OUT = VCC (MAX6895)
OUT
VIN > VTH
250nA
High
OUT = high impedance
(MAX6897)
Table 2. MAX6896/MAX6898 Output
1.0V
MAX6895
MAX6899
IN
ENABLE
OUT
VIN < VTH
Low
OUT = high impedance
(MAX6898)
VIN < VTH
High
OUT = high impedance
(MAX6898)
VIN > VTH
Low
OUT = VCC (MAX6896)
OUT = VCC (MAX6896)
CDELAY
GND
Figure 1. MAX6895/MAX6899 Functional Diagram
Low
OUT = VCC (MAX6896)
Detailed Description
The MAX6895–MAX6899 is a family of ultra-small, lowpower, sequencing/supervisory circuits. These devices
provide adjustable voltage monitoring for inputs down to
0.5V. They are ideal for use in power-supply sequencing, reset sequencing, and power-switching applications. Multiple devices can be cascaded for complex
sequencing applications.
Voltage monitoring is performed through a high-impedance input (IN) with an internally fixed 0.5V threshold.
When the voltage at IN falls below 0.5V or when the
enable input is deasserted (ENABLE = low or ENABLE =
high), the output deasserts (OUT goes low or OUT goes
high). When VIN rises above 0.5V and the enable input is
asserted (ENABLE = high or ENABLE = low), the output
asserts (OUT goes high or OUT goes low) after a capacitor-programmable time delay.
With VIN above 0.5V, the enable input can be used to
turn the output on or off. After the enable input is asserted, the output turns on with a capacitor-programmable
delay period (A version) or with a 150ns propagation
delay (P version). Tables 1, 2, and 3 detail the output
state depending on the various input and enable conditions.
6
VIN > VTH
High
OUT = high impedance
(MAX6898)
Table 3. MAX6899 Output
IN
ENABLE
OUT
VIN < VTH
Low
Low
VIN < VTH
High
Low
VIN > VTH
Low
High
VIN > VTH
High
Low
Supply Input (VCC)
The device operates with a VCC supply voltage from
1.5V to 5.5V. To maintain a 1.8% accurate threshold,
VCC must be above 1.5V. When VCC falls below the
UVLO threshold, the output deasserts. When VCC falls
below 1.2V the output state cannot be determined. For
noisy systems, connect a 0.1µF ceramic capacitor from
VCC to GND as close to the device as possible. For the
push-pull active-high output option, a 100kΩ external
pulldown resistor to ground ensures the correct logic
state for VCC down to 0.
_______________________________________________________________________________________
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
Adjustable Delay (CDELAY)
When VIN rises above VTH with ENABLE high (ENABLE
low), the internal 250nA current source begins charging
an external capacitor connected from CDELAY to GND.
When the voltage at CDELAY reaches 1V, the output
asserts (OUT goes high or OUT goes low). When the
output asserts, CCDELAY is immediately discharged.
Adjust the delay (tDELAY) from when VIN rises above
VTH (with ENABLE high or ENABLE low) to OUT going
high (OUT going low) according to the equation:
tDELAY = CCDELAY x 4.0 x 106 + 40µs
where CCDELAY is the external capacitor from CDELAY
to GND.
For adjustable delay devices (A version), when VIN >
0.5V and ENABLE goes from low to high (ENABLE
goes from high to low) the output asserts after a tDELAY
period. For nonadjustable delay devices (P version)
there is a 1µs propagation delay from when the enable
input is asserted to when the output asserts. Figures 2
through 5 show the timing diagrams for the adjustable
and fixed delay versions, respectively.
VCC
VUVLO
IN
VTH
VTH
t < tPROPA
ENABLE
t > tPW
OUT
tPROPA
tPROPA
tDELAY
tDL
tOFF
Figure 2. MAX6895A/MAX6897A Timing Diagram
_______________________________________________________________________________________
7
MAX6895–MAX6899
Monitor Input (IN)
Connect the center point of a resistive divider to IN to
monitor external voltages (see R1 and R2 of the Typical
Operating Circuit). IN has a rising threshold of VTH =
0.5V and a falling threshold of 0.495V (5mV hysteresis).
When VIN rises above V TH and ENABLE is high (or
ENABLE is low) OUT goes high (OUT goes low) after
the programmed tDELAY period. When VIN falls below
0.495V, OUT goes low (OUT goes high) after a 16µs
delay. IN has a maximum input current of 15nA so
large-value resistors are permitted without adding significant error to the resistive divider.
MAX6895–MAX6899
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
VCC
VUVLO
IN
t < tPROPA
t > tPW
ENABLE
OUT
tPROPA
tPROPA
tDELAY
tDL
tOFF
Figure 3. MAX6896A/MAX6898A Timing Diagram
VCC
VUVLO
IN
t > tPW
ENABLE
OUT
tDELAY
tPROPP
tDL
tOFF
tPROPP
Figure 4. MAX6895P/MAX6897P Timing Diagram
8
_______________________________________________________________________________________
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
MAX6895–MAX6899
VCC
VUVLO
IN
t > tPW
ENABLE
OUT
tDELAY
tPROPP
tDL
tOFF
tPROPP
Figure 5. MAX6896P/MAX6898P Timing Diagram
VCC
VUVLO
IN
VTH
VTH
t < tPROPA
t > tPW
ENABLE
OUT
tPROPA
tPROPA
tDELAY
tDL
tOFF
Figure 6. MAX6899A Timing Diagram
_______________________________________________________________________________________
9
MAX6895–MAX6899
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
VCC
VUVLO
IN
t > tPW
ENABLE
OUT
tDELAY
tPROPP
tDL
tOFF
tPROPP
Figure 7. MAX6899P Timing Diagram
Enable Input (ENABLE or ENABLE)
The MAX6895/MAX6897 offer an active-high enable
input (ENABLE), while the MAX6896/MAX6898/MAX6899
offer an active-low enable input (ENABLE). With VIN above
VTH, drive ENABLE high (ENABLE low) to force OUT high
(OUT low) after the adjustable delay time (A versions). For
P version devices, when VIN > 0.5V and enable is asserted, the output asserts after typically 150ns.
The enable input has logic-high and logic-low voltage
thresholds of 1.4V and 0.4V, respectively. For both versions, when VIN > 0.5V, drive ENABLE low (ENABLE
high) to force OUT low (OUT high) within 150ns typ.
Output (OUT or OUT)
The MAX6895/MAX6899 offer an active-high, push-pull
output (OUT), and the MAX6896 offers an active-low
push-pull output (OUT). The MAX6897 offers an activehigh open-drain output (OUT), and the MAX6898 offers
an active-low open-drain output (OUT).
Applications Information
Input Threshold
The MAX6895–MAX6899 monitor the voltage on IN with
an external resistive divider (see R1 and R2 in the
Typical Operating Circuit). Connect R1 and R2 as close
to IN as possible. R1 and R2 can have very high values
to minimize current consumption due to low IN leakage
currents (±15nA max). Set R2 to some conveniently
high value (1MΩ, for example) and calculate R1 based
on the desired monitored voltage using the following
formula:
⎡V
⎤
R1 = R2 × ⎢ MONITOR − 1⎥
V
IN
⎣
⎦
where VMONITOR is the desired monitored voltage and
VIN is the detector input threshold (0.5V).
Push-pull output devices are referenced to VCC. Opendrain outputs can be pulled up to 28V.
10
______________________________________________________________________________________
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
The exact value of the pullup resistors for the opendrain 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 protection circuit. Figure 9 shows the MAX6895 in a lowvoltage sequencing application using an n-channel
MOSFET. Figure 10 shows the MAX6895 used in a multiple-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 nchannel 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.
5V BUS 1.2V INPUT
3.3V ALWAYS ON
N
P
0 TO 28V
1.2V OUTPUT
MONITORED
3.3V
ENABLE
VCC
ENABLE
RPULLUP
VCC
R1
R1
OUT
OUT
MAX6895
MAX6897
IN
IN
CDELAY
CDELAY
R2
R2
GND
Figure 8. Overvoltage Protection
GND
CCDELAY
Figure 9. Low-Voltage Sequencing Using an n-Channel MOSFET
______________________________________________________________________________________
11
MAX6895–MAX6899
Pullup Resistor Values
(MAX6897/MAX6898)
MAX6895–MAX6899
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
2.5V
3.3V
5V BUS
DC-DC
1.2V
1.8V
DC-DC
DC-DC
DC-DC
EN
EN
EN
EN
SYSTEM
ENABLE
ENABLE
IN
MAX6895
VCC
ENABLE
IN
OUT
GND
VCC
MAX6895
ENABLE
IN
OUT
GND
CCDELAY
VCC
MAX6895
IN
OUT
GND
CCDELAY
VCC
ENABLE
MAX6895
GND
CCDELAY
Figure 10. Multiple-Output Sequencing
12
OUT
______________________________________________________________________________________
CCDELAY
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
PART
MAX6895AALT+T
ENABLE INPUT
Active-High
OUTPUT
Active-High, Push-Pull
INPUT (IN) DELAY
Capacitor Adjustable
ENABLE DELAY
Capacitor Adjustable
MAX6895AAZT+T
Active-High
Active-High, Push-Pull
Capacitor Adjustable
Capacitor Adjustable
MAX6895PALT+T
Active-High
Active-High, Push-Pull
Capacitor Adjustable
150ns Delay
MAX6895PAZT+T
Active-High
Active-High, Push-Pull
Capacitor Adjustable
150ns Delay
MAX6896AALT+T
Active-Low
Active-Low, Push-Pull
Capacitor Adjustable
Capacitor Adjustable
MAX6896AAZT+T
Active-Low
Active-Low, Push-Pull
Capacitor Adjustable
Capacitor Adjustable
MAX6896PALT+T
Active-Low
Active-Low, Push-Pull
Capacitor Adjustable
150ns Delay
MAX6896PAZT+T
Active-Low
Active-Low, Push-Pull
Capacitor Adjustable
150ns Delay
MAX6897AALT+T
Active-High
Active-High, Open-Drain
Capacitor Adjustable
Capacitor Adjustable
MAX6897AAZT+T
Active-High
Active-High, Open-Drain
Capacitor Adjustable
Capacitor Adjustable
MAX6897PALT+T
Active-High
Active-High, Open-Drain
Capacitor Adjustable
150ns Delay
MAX6897PAZT+T
Active-High
Active-High, Open-Drain
Capacitor Adjustable
150ns Delay
MAX6898AALT+T
Active-Low
Active-Low, Open-Drain
Capacitor Adjustable
Capacitor Adjustable
MAX6898AAZT+T
Active-Low
Active-Low, Open-Drain
Capacitor Adjustable
Capacitor Adjustable
MAX6898PALT+T
Active-Low
Active-Low, Open-Drain
Capacitor Adjustable
150ns Delay
MAX6898PAZT+T
Active-Low
Active-Low, Open-Drain
Capacitor Adjustable
150ns Delay
MAX6899AALT+T
Active-Low
Active-High, Push-Pull
Capacitor Adjustable
Capacitor Adjustable
MAX6899AAZT+T
Active-Low
Active-High, Push-Pull
Capacitor Adjustable
Capacitor Adjustable
MAX6899PALT+T
Active-Low
Active-High, Push-Pull
Capacitor Adjustable
150ns Delay
MAX6899PAZT+T
Active-Low
Active-High, Push-Pull
Capacitor Adjustable
150ns Delay
Typical Operating Circuit
Ordering Information (continued)
PART
MAX6897AALT+
MAX6897AAZT+
MAX6897PALT+T
MAX6897PAZT+
MAX6898AALT+
MAX6898AAZT+
MAX6898PALT+T
MAX6898PAZT+
MAX6899AALT+
MAX6899AAZT+
MAX6899PALT+T
MAX6899PAZT+
PIN-PACKAGE
6 µDFN
6 Thin SOT23
6 µDFN
6 Thin SOT23
6 µDFN
6 Thin SOT23
TOP MARK
+BA
1.5V TO 5.5V
+AADQ
0.1µF
+BB
+AADR
ENABLE
VCC
R1
OUT
+BD
+AADS
MAX6895
+BC
6 µDFN
6 Thin SOT23
+AADT
6 µDFN
6 Thin SOT23
+AADM
6 µDFN
6 Thin SOT23
+AADN
IN
+LO
+LP
CDELAY
R2
GND
CCDELAY
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
______________________________________________________________________________________
13
MAX6895–MAX6899
Selector Guide
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
MAX6895–MAX6899
Pin Configurations (continued)
TOP VIEW
TOP VIEW
VCC
CDELAY
OUT
6
5
4
+
MAX6896
MAX6898
1
2
3
ENABLE
GND
IN
ENABLE
1
GND
2
IN
3
6 CDELAY
MAX6895
MAX6897
5
VCC
4
OUT
THIN SOT23
µDFN
TOP VIEW
ENABLE
1
GND
2
IN
3
+
6 CDELAY
MAX6896
MAX6898
MAX6899
5
VCC
4
OUT
(OUT)
THIN SOT23
( ) FOR MAX6899 ONLY.
Package Information
Chip Information
PROCESS: BiCMOS
14
For the latest package outline information and land patterns, 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.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE NO.
LAND
PATTERN NO.
6 µDFN
L611+1
21-0147
90-0080
6 Thin SOT23
Z6+1
21-0114
90-0242
______________________________________________________________________________________
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
REVISION
NUMBER
REVISION
DATE
5
10/07
—
6
11/09
Corrected Absolute Maximum Ratings and made style corrections to Electrical
Characteristics and TOC8 and TOC9
2–5
7
7/10
Revised Figures 3, 4, and 6.
7–9
DESCRIPTION
PAGES
CHANGED
1, 13, 18
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 ____________________ 15
© 2010 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX6895–MAX6899
Revision History