19-3673; Rev 8; 7/11
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
input and an 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.
Features
♦
1.8% Accurate Adjustable Threshold Over
Temperature
♦
Operate from V
CC
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
MAX6895–MAX6899
Ordering Information
PART
MAX6895AALT+
MAX6895AAZT+
MAX6895PALT+T
MAX6895PAZT+
MAX6896AALT+
MAX6896AAZT+
MAX6896AAZT/V+T
MAX6896PALT+T
MAX6896PAZT+
PIN-PACKAGE
6 µDFN
6 Thin SOT23
6 µDFN
6 Thin SOT23
6 µDFN
6 Thin SOT23
6 Thin SOT23
6 µDFN
6 Thin SOT23
TOP MARK
+AW
+AADK
+AX
+AADL
+AY
+AADO
+AATA
+AZ
+AADP
MAX6896PAZT/V+T
6 Thin SOT23
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(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations
TOP VIEW
V
CC
6
CDELAY
5
OUT
4
Applications
Automotive
Medical Equipment
Intelligent Instruments
Portable Equipment
Computers/Servers
Critical µP Monitoring
Set-Top Boxes
Telecom
1
ENABLE
(ENABLE)
MAX6895
MAX6897
MAX6899
2
GND
3
IN
µDFN
Typical Operating Circuit and Selector Guide appear at end
of data sheet.
( ) FOR MAX6899 ONLY.
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
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.
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
MAX6895–MAX6899
ABSOLUTE MAXIMUM RATINGS
V
CC
, ENABLE,
ENABLE,
IN....................................-0.3V to +6V
OUT,
OUT
(push-pull) ................................-0.3V to (V
CC
+ 0.3V)
OUT,
OUT
(open-drain)..........................................-0.3V to +30V
CDELAY......................................................-0.3V to (V
CC
+ 0.3V)
Output Current (all pins) ...................................................±20mA
Continuous Power Dissipation (T
A
= +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
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
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.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
µDFN
Junction-to-Ambient Thermal Resistance (θ
JA
)...............477°C/W
Junction-to-Case Thermal Resistance (θ
JC
)......................122°C/W
Thin SOT23
Junction-to-Ambient Thermal Resistance (θ
JA
)................110°C/W
Junction-to-Case Thermal Resistance (θ
JC
).......................50°C/W
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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 1.5V to 5.5V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
= +25°C, unless
otherwise noted.) (Note 2)
PARAMETER
SUPPLY
Operating Voltage Range
Undervoltage Lockout (Note 3)
V
CC
Supply Current
IN
Threshold Voltage
Hysteresis
Input Current (Note 4)
CDELAY
Delay Charge Current
Delay Threshold
CDELAY Pulldown Resistance
ENABLE/ENABLE
Input Low Voltage
Input High Voltage
Input Leakage Current
V
IL
V
IH
I
LEAK
ENABLE,
ENABLE
= V
CC
or GND
1.4
-100
+100
0.4
V
V
nA
I
CD
V
TCD
R
CDELAY
CDELAY rising
200
0.95
250
1.00
130
300
1.05
500
nA
V
Ω
V
TH
V
HYST
I
IN
V
IN
rising, 1.5V < V
CC
< 5.5V
V
IN
falling
V
IN
= 0V or V
CC
-15
0.491
0.5
5
+15
0.509
V
mV
nA
V
CC
UVLO
I
CC
V
CC
falling
V
CC
= 3.3V, no load
1.5
1.20
10
5.5
1.35
20
V
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.5V to 5.5V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
= +25°C, unless
otherwise noted.) (Note 2)
PARAMETER
OUT/OUT
Output Low Voltage (Open-Drain
or Push-Pull)
V
CC
≥
1.2V, I
SINK
= 90µA,
MAX6895/MAX6897/MAX6899 only
V
OL
V
CC
≥
2.25V, I
SINK
= 0.5mA
V
CC
≥
4.5V, I
SINK
= 1mA
V
CC
≥
2.25V, I
SOURCE
= 500µA
Output High Voltage (Push-Pull)
V
OH
V
CC
≥
4.5V, I
SOURCE
= 800µA
Output Open-Drain Leakage
Current
TIMING
IN to OUT/OUT Propagation
Delay
Startup Delay (Note 5)
ENABLE/ENABLE Minimum Input
Pulse Width
ENABLE/ENABLE Glitch
Rejection
ENABLE/ENABLE to OUT/OUT
Delay
t
OFF
t
PROPP
ENABLE/ENABLE to OUT/OUT
Delay
From device enabled to device disabled
From device disabled to device enabled
(P version)
From device disabled C
CDELAY
= 0µF
to device enabled
C
CDELAY
= 0.047µF
(A version)
t
PW
1
100
150
150
20
190
t
DELAY
t
DL
V
IN
rising
V
IN
falling
C
CDELAY
= 0µF
C
CDELAY
= 0.047µF
40
190
16
2
µs
ms
µs
ms
µs
ns
ns
ns
µs
ms
I
LKG
Output high impedance, V
OUT
= 28V
0.8 x
V
CC
0.8 x
V
CC
1
µA
0.3
0.3
0.4
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX6895–MAX6899
V
t
PROPA
Note 2:
All devices are production tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
Note 3:
When V
CC
falls below the UVLO threshold, the outputs will deassert (OUT goes low,
OUT
goes high). When V
CC
falls below
1.2V, the out annot be determined.
Note 4:
Guaranteed by design.
Note 5:
During the initial power-up, V
CC
must exceed 1.5V for at least 2ms before the output is guaranteed to be in the correct state.
_______________________________________________________________________________________
3
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
MAX6895–MAX6899
Typical Operating Characteristics
(V
CC
= 3.3V and T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
V
CC
(V)
MAX6895 toc01
SUPPLY CURRENT
vs. TEMPERATURE
MAX6895 toc02
IN THRESHOLD
vs. TEMPERATURE
0.5008
0.5006
0.5004
V
CC
= 3V
V
TH
(V)
0.5002
0.5000
0.4998
0.4996
0.4994
0.4992
0.4990
MAX6895 toc03
20
18
16
14
I
CC
(µA)
12
10
8
6
4
2
0
V
CC
= 1.5V
V
CC
= 5V
0.5010
I
CC
(µA)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
OUT DELAY
vs. C
CDELAY
MAX6895 toc04
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
MAX6895 toc05
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
V
CC
= 5V
4.5
4.0
3.5
V
OH
(V)
3.0
2.5
2.0
1.5
V
CC
= 1.5V
V
CC
= 3V
MAX6895 toc06
5000
4500
4000
3500
t
DELAY
(ms)
1.5
V
CC
= 1.5V
1.2
V
CC
= 3V
V
OL
(V)
0.9
V
CC
= 5V
5.0
3000
2500
2000
1500
1000
500
0
0 100 200 300 400 500 600 700 800 900 1000
C
CDELAY
(nF)
0.6
0.3
1.0
0.5
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
I
SINK
(mA)
0
0
2
4
6
8
10 12 14 16 18 20
I
SOURCE
(mA)
MAXIMUM TRANSIENT DURATION
vs. INPUT OVERDRIVE
MAXIMUM TRANSIENT DURATION (µs)
MAX6895 toc07
ENABLE TURN-ON/OFF (MAX6896P)
MAX6895 toc08
ENABLE TURN-ON/OFF DELAY
(MAX6895A)
MAX6895
toc09
600
500
400
300
200
100
0
0
RESET
OCCURS
V
OUT
2V/div
V
OUT
2V/div
V
ENABLE
2V/div
V
ENABLE
2V/div
10 20 30 40 50 60 70 80 90 100
V
OVERDRIVE
(mV)
100ns/div
40ms/div
4
_______________________________________________________________________________________
Ultra-Small, Adjustable
Sequencing/Supervisory Circuits
Pin Description
PIN
MAX6895/
MAX6897
µDFN
THIN
SOT23
MAX6896/
MAX6898
µDFN
THIN
SOT23
MAX6899
µDFN
THIN
SOT23
Active-High Logic-Enable Input. Drive ENABLE low to
immediately deassert the output to its false state (OUT = low or
OUT
= high) independent of V
IN
. With V
IN
above V
TH
, 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 V
IN
. With V
IN
above V
TH
, 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 V
IN
rises above 0.5V and when V
IN
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 V
IN
is above V
TH
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 V
IN
drops below V
TH
- 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 V
IN
is above V
TH
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 V
IN
drops below V
TH
- 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
(C
CDELAY
) 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. t
DELAY
= (C
CDELAY
x 4.0 x 10 ) + 40µs. There is a
fixed short delay (40µs, typ) for the output deasserting when V
IN
falls below V
TH
.
Supply Voltage Input. Connect a 1.5V to 5.5V supply to V
CC
to
power the device. For noisy systems, bypass with a 0.1µF
ceramic capacitor to GND.
NAME
FUNCTION
MAX6895–MAX6899
1
1
—
—
—
—
ENABLE
—
—
1
1
1
1
ENABLE
2
2
2
2
2
2
GND
3
3
3
3
3
3
IN
4
4
—
—
4
4
OUT
—
—
4
4
—
—
OUT
5
6
5
6
5
6
CDELAY
6
5
6
5
6
5
V
CC
_______________________________________________________________________________________
5
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