MAX6354MTUT-T [MAXIM]
Dual/Triple-Voltage レP Supervisory Circuits; 双/三电压微处理器监控电路
| 型号： | MAX6354MTUT-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Dual/Triple-Voltage レP Supervisory Circuits |
| 文件： | 总8页 (文件大小：108K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1508; Rev 1; 10/99
Dual/Triple-Voltage
µP Supervisory Circuits
51–MAX360
General Description
Features
The MAX6351–MAX6360 microprocessor (µP) supervi-
sors with multiple reset voltages significantly improve
system reliability and accuracy compared to separate
ICs or discrete components. If any input supply voltage
drops below its associated preset threshold, all reset
outputs are asserted. In addition, the output(s) is valid
as long as either input supply voltage remains greater
than +1.0V.
♦ Precision Monitoring of Multiple +2.5V, +3.0V,
+3.3V, and +5V Power-Supply Voltages
♦ Precision Factory-Set Power-Supply
Reset Thresholds
♦ 20µA Supply Current
♦ 100ms min Power-On Reset Pulse Width
♦ Fully Guaranteed Over Temperature
All devices in this series have an active-low debounced
manual reset input. In addition, the MAX6358/MAX6359/
MAX6360 offer a watchdog timer input with a 46.4sec
start-up timeout period and a 2.9sec timeout period.
The MAX6355/MAX6356/MAX6357 offer an additional
voltage monitor input to monitor a third voltage.
♦ Guaranteed RESET Valid to V 5 = 1V or
CC
V
3 = 1V
CC
♦ Power-Supply Transient Immunity
♦ No External Components for Dual-Voltage
The MAX6351 features both 3V and 5V active-low push-
pull reset outputs. The MAX6353/MAX6356/MAX6359
offer a 5V active-low push-pull reset. The MAX6354/
MAX6357/MAX6360 offer a 3V active-low push-pull
reset. The MAX6352/MAX6355/MAX6358’s reset is
active-low open-drain.
Systems
♦ Small 5- and 6-Pin SOT23 Packages
♦ Debounced TTL/CMOS-Compatible
Manual-Reset Input
♦ Watchdog Timer
All of these devices are offered with a wide variety of
voltage threshold levels, as shown in the Voltage
Threshold Levels table below. They are available in 5-
and 6-pin SOT23 packages and operate over the
extended (-40°C to +85°C) temperature range.
46.4sec Start-Up Timeout
2.9sec Normal Timeout
♦ Low Cost
Applications
Intelligent Instruments
Multivoltage Systems
Ordering Information
Computers
Controllers
Portable/Battery-Powered
Equipment
PART*
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
5 SOT23-5
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
MAX6351_ _UT-T
MAX6352_ _UK-T
MAX6353_ _UK-T
MAX6354_ _UK-T
MAX6355_ _UT-T
MAX6356_ _UT-T
MAX6357_ _UT-T
MAX6358_ _UT-T
MAX6359_ _UT-T
MAX6360_ _UT-T
__________Voltage Threshold Levels
PART NO.
SUFFIX
(_ _)
V
5 NOMINAL
VOLTAGE
V 3 NOMINAL
CC
CC
VOLTAGE
THRESHOLD (V)
THRESHOLD (V)
LT
LS
LR
MT
MS
MR
TY
4.63
4.63
4.63
4.38
4.38
4.38
3.08
2.93
3.08
2.93
2.63
3.08
2.93
2.63
2.19
2.19
*The _ _ are placeholders for the threshold voltage levels of the
devices. Substitute the part number suffix in the Voltage
Threshold Levels table for the desired voltage level. There are
two standard versions for each of the above part numbers. All
devices are available in tape-and-reel only.
SY
Note: Standard versions are shown in bold and have a required
order increment of 2500 pieces. Sample stock is generally held on
the standard versions only. The required order increment for non-
standard versions is 10,000 pieces. Contact factory for availability.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Dual/Triple-Voltage
µP Supervisory Circuits
ABSOLUTE MAXIMUM RATINGS
V
CC
5, V 3 to GND .................................................-0.3V to +6V
Continuous Power Dissipation (T = +70°C)
A
CC
5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) ........571mW
6-Pin SOT23-6 (derate 7.1mW/°C above +70°C) ........571mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
RST (MAX6352/55/58)............................................. -0.3V to +6V
RST, MR, WDI, RST5, RSTIN
(MAX6351/53/56/59).............................-0.3V to (V 5 + 0.3V)
CC
RST, RST3 (MAX6351/54/57/60) .................-3V to (V 3 + 0.3V)
CC
Input/Output Current, All Pins .............................................20mA
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
(V 3 = V 5 = +1.2V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
CC
CC
A
PARAMETER
SYMBOL
CONDITIONS
= 0°C to +70°C
MIN
1.0
TYP
MAX
5.5
UNITS
T
T
A
Supply Voltage Range (Note 2)
Supply Current
V
CC
V
= -40°C to +85°C
1.2
5.5
A
I 5 +
CC
V
5 = 5.5V, V 3 = 3.6V, all I/O pins open
20
50
µA
CC
CC
51–MAX360
I 3
CC
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
T
A
= +25°C
4.54
4.5
4.63
4.72
4.75
4.46
4.50
3.14
3.15
2.98
3.00
3.14
3.15
2.98
3.00
2.68
2.70
2.22
2.25
MAX63_ _L_
MAX63_ _M_
MAX63_ _T_
MAX63_ _S_
MAX63_ _ _T
MAX63_ _ _S
MAX63_ _ _R
MAX63_ _ _Y
= -40°C to +85°C
= +25°C
4.3
4.38
3.08
2.93
3.08
2.93
2.63
2.19
20
= -40°C to +85°C
= +25°C
4.25
3.03
3.00
2.88
2.85
3.03
3.00
2.88
2.85
2.58
2.55
2.16
2.13
V
5 Threshold (Note 3)
V
5
V
CC
TH
= -40°C to +85°C
= +25°C
= -40°C to +85°C
= +25°C
= -40°C to +85°C
= +25°C
= -40°C to +85°C
= +25°C
V
CC
3 Threshold (Note 3)
V
TH
3
V
= -40°C to +85°C
= +25°C
= -40°C to +85°C
Reset Threshold Tempco
Reset Threshold Hysteresis
∆V /°C
ppm/°C
TH
V
/500
TH
V
V
to Reset Delay
100mV overdrive
20
180
µs
ms
CC
Reset Timeout Period
t
V
CC
V
CC
V
CC
5 > V
5
, V 3 > V 3
(MAX)
TH
100
280
0.3
0.4
(MAX)
RP
TH
CC
5 or V 3 ≥ 2.7V, I
= 1.2mA
= 3.2mA
CC
SINK
SINK
5 or V 3 ≥ 4.5V, I
CC
V
V
V
CC
5 or V 3 < 1V, I
= 50µA,
V
RESET Output Voltage Low
CC
SINK
OL
0.3
0.3
T
A
= 0°C to +70°C
V
CC
5 or V 3 < 1.2V, I
= 50µA
CC
SINK
2
_______________________________________________________________________________________
Dual/Triple-Voltage
µP Supervisory Circuits
51–MAX360
ELECTRICAL CHARACTERISTICS (continued)
(V 3 = V 5 = +1.2V to +5.5V, T = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
CC
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX6351/MAX6353/
MAX6354/MAX6356/
MAX6357/MAX6359/
MAX6360
I
= 500µA
0.8V
CC
SOURCE
(_Y versions only),
V
CC
V
CC
5 > V
3 > V
5
3
,
(MAX)
(MAX)
TH
TH
V
OH
V
RESET Output Voltage High
MAX6351/MAX6353/
MAX6354/MAX6356/
MAX6357/MAX6359/
MAX6360
I
= 800µA
V
CC
- 1.5
SOURCE
(L_, M_ versions only),
V
CC
V
CC
5 > V
3 > V
5
3
,
(MAX)
(MAX)
TH
TH
WATCHDOG INPUT (MAX6358/MAX6359/MAX6360)
First timeout period after reset
After first WDI falling edge
25.6
1.6
50
46.4
2.9
72.0
4.5
Watchdog Timeout Period
WDI Pulse Width (Note 4)
WDI Input Threshold (Note 5)
t
sec
ns
V
WD
t
V
IL
= 0.4V, V = 0.8V
IH CC
WDI
V
0.3V
CC
IL
V 3 = 5V
CC
V
0.7V
CC
IH
V
V
= V
= 0
120
-15
160
WDI
CC
WDI Input Current (Note 6)
µA
-20
0.8
WDI
MANUAL RESET INPUT
V
V
MAX63_ _L_, MAX63_ _M_, V 5 > V
CC
5
5
(MAX)
IL
TH
MAX63_ _L_, MAX63_ _M_, V 5 > V
CC
2.3
(MAX)
IH
TH
V
MR Input
V
IL
MAX63_ _ _Y, V 5 > V
CC
5
5
0.3V
CC
(MAX)
(MAX)
TH
V
IH
MAX63_ _ _Y, V 5 > V
CC
0.7V
TH
CC
32
10
63.5
100
kΩ
µs
ns
µs
MR Pull-Up Resistance
MR Minimum Pulse Width
MR Glitch Rejection
MR to Reset Delay
t
RP
100
0.1
t
MD
ADJUSTABLE RESET COMPARATOR INPUT (MAX6355/MAX6356/MAX6357)
T
T
= +25°C
1.20
1.19
-25
1.22
1.24
1.25
25
A
A
V
V
5 > V
3 > V
5
3
(MAX),
(MAX)
CC
CC
TH
TH
RSTIN Input Threshold
V
V
RSTIN
RSTIN
= -40°C to +85°C
RSTIN Input Current
RSTIN Hysteresis
I
0 < V
< V 5 - 0.3V
nA
RISTIN
CC
2.5
mV
Note 1: Overtemperature limits are guaranteed by design and not production tested.
Note 2: The reset output is guaranteed to be in the correct state if either V 3 or V 5 is within its specified region of operation.
CC
CC
Note 3: The reset output(s) is asserted if either V 5 or V 3 drops below its associated trip point.
CC
CC
Note 4: Guaranteed by design. Not production tested.
Note 5: WDI is internally serviced within the watchdog timeout period if WDI is left unconnected.
Note 6: The WDI input current is specified as the average input current when the WDI input is driven high or low.
_______________________________________________________________________________________
3
Dual/Triple-Voltage
µP Supervisory Circuits
Typical Operating Characteristics
(V = +5V, T = +25°C, unless otherwise noted.)
CC
A
RESET vs. V 5 (V 3 = 3V)
SUPPLY CURRENT vs. TEMPERATURE
RESET vs. V 5 (V 3 = GND)
CC
CC
CC
CC
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
20
15
10
5
VCC
I
5 (V 5 = 5.0V, V 3 = 3.3V)
CC CC CC
10k
VCC5 OR VCC
3
RST
RST3
RST5
V
TH
I
5 (V 5 = 3.3V, V 3 = 2.5V)
CC
CC
CC
MAX6351
MAX6360
I
3 (V 5 = 5.0V, V 3 = 3.3V)
CC CC CC
I
3 (V 5 = 3.3V, V 3 = 2.5V)
CC
CC
CC
0
-40
-15
10
35
60
85
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
5 (V)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
5 (V)
TEMPERATURE (°C)
V
CC
V
CC
51–MAX360
MAXIMUM V TRANSIENT DURATION
CC
vs. RESET THRESHOLD OVERDRIVE
RESET DELAY vs.
RESET THRESHOLD OVERDRIVE
NORMALIZED RESET/WATCHDOG
PERIOD vs. TEMPERATURE
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
300
250
200
150
100
50
250
200
150
100
50
RESET OCCURS ABOVE LINE
DELAY FROM FALL OF V
3
CC
DELAY FROM FALL OF V
5
CC
0
0
0.01
0.1
1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
RESET THRESHOLD OVERDRIVE, V - V (V)
-60 -40 -20
0
20 40 60 80 100
RESET THRESHOLD OVERDRIVE, V - V (V)
TEMPERATURE (°C)
RST CC
RST CC
PULL-DOWN CHARACTERISTICS
AND MANUAL RESET DELAY
PULL-UP CHARACTERISTICS
MAX6351/60-07
MAX6351/60-08
5V
0
5V
MR
5V PUSH-PULL
OUTPUT
OPEN-DRAIN
OUTPUT
0
5V
0
5V
OPEN-DRAIN
OUTPUT
5V
0
3V PUSH-PULL
OUTPUT
0
3V
3V PUSH-PULL
OUTPUT
5V PUSH-PULL
OUTPUT
5V
0
0
400ns/div
40ns/div
4
_______________________________________________________________________________________
Dual/Triple-Voltage
µP Supervisory Circuits
51–MAX360
Pin Description
PIN
MAX6352
MAX6353
MAX6354
MAX6355
MAX6356
MAX6357
MAX6358
MAX6359
MAX6360
NAME
FUNCTION
MAX6351
1
—
—
—
Active-Low, 5V CMOS Reset Output
RST5
RST
Active-Low Reset Output. Open-drain for the
MAX6352/MAX6355/MAX6358, 5V push-pull for the
MAX6353/MAX6356/MAX6359, and 3V push-pull for
the MAX6354/MAX6357/MAX6360.
—
2
1
1
1
2
2
2
GND
Ground
Manual-Reset Input. Pull low to force a reset. RST,
RST5, and RST3 remain active as long as MR is low
and for the timeout period after MR goes high.
3
3
3
3
MR
Leave unconnected or connect to V 5 if unused.
CC
V
must be below V 5.
MR
CC
+3.3V/+3.0V Supply Input. Powers the device when
4
5
4
4
4
V
3
CC
it is above V 5 and monitors its own voltage.
CC
—
—
—
Active-Low, 3V CMOS Reset Output
RST3
Undervoltage Reset Comparator Input. Asserts
reset when the monitored voltage falls below 1.23V.
Set the reset threshold with an external resistor-
—
—
5
—
RSTIN
divider. Connect to V 5 if unused. V
must be
CC
RSTIN
below V 5.
CC
Watchdog Input. If WDI remains either high or low
longer than the timeout period, then reset is trig-
gered. The timer clears when reset is asserted or
whenever WDI sees a rising or falling edge. Leave
floating to disable it if unused.
—
6
—
5
—
6
5
6
WDI
+5V Supply Input. Powers the device when it is
V 5
CC
above V 3 and monitors its own voltage.
CC
_______________________________________________________________________________________
5
Dual/Triple-Voltage
µP Supervisory Circuits
Threshold Levels
All the possible input voltage threshold level combina-
tions are indicated by a two-letter code in Voltage
Threshold Levels. The two standard combinations are
LS and SY. LS parts monitor one +5V 5ꢀ supply and
one +3.3V 10ꢀ supply. SY parts monitor one +3.3V
10ꢀ supply and one +2.5V 10ꢀ supply. The other
combinations also monitor +5V 10ꢀ supplies, +3.3V
5ꢀ supplies, and +3V 5ꢀ supplies.
Detailed Description
Supply Voltages
The MAX6351–MAX6360 microprocessor (µP) superviso-
ry circuits maintain system integrity by alerting the µP to
fault conditions. These ICs monitor multiple-supply sys-
tems and derive their internal power from the highest volt-
age source present at V 5 and V 3. In addition, the
CC
CC
output reset state is guaranteed to remain viable while
either V 5 or V 3 is above +1V.
CC
CC
Reset Outputs
The MAX6351 provides a 5V active-low reset and a 3V
active-low reset. The MAX6353/MAX6356/MAX6359 pro-
vide a 5V active-low push-pull reset and the MAX6354/
MAX6357/MAX6360 provide a 3V active-low push-pull
reset. The MAX6353/MAX6355/MAX6358 provide an
active-low open-drain reset. The higher input voltages of
3
MR
GLITCH
FILTER
(5) 6
V 5
CC
V
5 and V 3 maintain the sinking capability of the
CC
CC
low reset-output state. The reset outputs are maintained
as long as either supply is above +1V.
51–MAX360
V
5
TH
Negative-Going V
Transients
The MAX6351–MAX6360 are designed to ignore short
CC
RST (1)
RST3 (5)
RST5 (1)
negative-going V 5 and V 3 transients. See Typical
CC
CC
4
V 3
CC
Operating Characteristics for a glitch immunity graph.
RESET
GENERATOR
Third Input Voltage
(MAX6355/MAX6356/MAX6357)
The MAX6355/MAX6356/MAX6357 provide an addition-
al input to monitor a third voltage. The threshold voltage
at RSTIN is typically 1.22V. To monitor a voltage higher
than 1.22V, connect a resistor-divider to the circuit as
V
3
TH
shown in Figure 2. The threshold at V is:
3
(RSTIN)
(5)
R1 + R2
V
= 1.22
3TH
R2
Note that RSTIN is powered by V 5, and its voltage
CC
must therefore remain lower than V 5.
CC
1.22V
(5) (WDI)
WATCHDOG
TIMER
V3
MAX6355
MAX6356
MAX6357
RSTIN
R1
2
MAX6351–MAX6360
GND
R2
NOTE: PIN 1 IS RST5 FOR THE MAX6351 AND RST FOR THE
MAX6352–MAX6360. PIN 5 IS RST3 FOR THE MAX6351, RSTIN
FOR THE MAX6355/56/57, WDI FOR THE MAX6358/59/60,
V
5 ≥ V
CC RSTIN
AND V FOR THE MAX6352/53/54.
CC
Figure 1. Functional Diagram
Figure 2. Monitoring a Third Voltage
6
_______________________________________________________________________________________
Dual/Triple-Voltage
µP Supervisory Circuits
51–MAX360
Watchdog Input
(MAX6358/MAX6359/MAX6360)
Interfacing to µPs with
Bidirectional Reset Pins
Microprocessors with bidirectional reset pins will con-
tend with the push-pull outputs of these devices. To
prevent this, connect a 4.7kΩ resistor between RESET
The MAX6358/MAX6359/MAX6360 include a WDI to
provide a reset if the µP goes into an infinite loop. After
a reset, the start-up timeout period and the initial time-
out period is nominally 46.4sec to allow the µP time to
initialize. After the first transition on the WDI and after
any toggle of the watchdog thereafter, the timeout peri-
od is nominally 2.9sec.
and the µP’s reset I/O port, as shown in Figure 5. Buffer
RESET as shown in the figure if this reset is used by
other components in the system.
Applications Information
V 5
CC
Ensuring a Valid RESET Output
Down to V
CC
= 0
In some systems, it is necessary to ensure a valid reset
even if V falls to 0. In these applications, use the cir-
CC
R1
R2
MAX6355
MAX6356
MAX6357
cuit shown in Figure 3. Note that this configuration does
not work for the open-drain outputs of the MAX6352/
MAX6355/MAX6358.
RSTIN
Monitoring a Negative Voltage
To monitor a negative supply rail using RSTIN or the
MAX6355/MAX6356/MAX6357, use the circuit shown in
Figure 4. In this configuration, a reset is issued when
R2
R1
V
IN
V
INTH
= 1.22 -
(V 5 - 1.22)
CC
the negative supply falls below V
.
INTH
V
INR
1
V
V
5 ≥ -
CC
R
2
5 ≥ V
CC
RSTIN
Figure 4. Monitoring a Negative Voltage
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
+3.3V/+3V +5V
V 3 V 5
CC CC
RST
RST3
RST5
V
V
5
3
CC
V
V
5
3
CC
CC
CC
100k
RST
µP
4.7k
RESET
RST3
RST5
MAX6351–MAX6360
GND
MAX6351–MAX6360
GND
GND
Figure 3. Ensuring a Valid Reset Low to V 5 and V 3 = 0
CC
CC
Figure 5. Interfacing to µPs with Bidirectional Reset I/O
Chip Information
TRANSISTOR COUNT: 855
_______________________________________________________________________________________
7
Dual/Triple-Voltage
µP Supervisory Circuits
Pin Configurations
TOP VIEW
RST5
GND
MR
1
2
3
6
5
4
V
5
RST*
GND
MR
1
2
3
5
4
V
V
5
3
CC
CC
MAX6351
MAX6352
MAX6353
MAX6354
*MAX6352: OPEN-DRAIN OUTPUT
*MAX6353: 5V PUSH-PULL OUTPUT
*MAX6354: 3V PUSH-PULL OUTPUT
RST3
V
CC
3
CC
SOT23-6
SOT23-5
51–MAX360
RST*
GND
MR
1
2
3
6
5
4
V
5
RST*
GND
MR
1
6
5
4
V 5
CC
CC
MAX6355
MAX6356
MAX6357
MAX6358
MAX6359
MAX6360
*MAX6355: OPEN-DRAIN OUTPUT
*MAX6356: 5V PUSH-PULL OUTPUT
*MAX6357: 3V PUSH-PULL OUTPUT
*MAX6358: OPEN-DRAIN OUTPUT
*MAX6359: 5V PUSH-PULL OUTPUT
*MAX6360: 3V PUSH-PULL OUTPUT
RSTIN
2
3
WDI
V
CC
3
V 3
CC
SOT23-6
SOT23-6
Selector Guide
NUMBER OF
SUPPLIES
MONITORED
OPEN-DRAIN
PIN
COUNT
WATCHDOG
TIMER
MANUAL
RESET
PART
5V RESET
3V RESET
RESET
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
MAX6351
MAX6352
MAX6353
MAX6354
MAX6355
MAX6356
MAX6357
MAX6358
MAX6359
MAX6360
6
5
5
5
6
6
6
6
6
6
2
2
2
2
3
3
3
2
2
2
—
✔
—
—
—
—
—
—
—
✔
—
✔
—
—
✔
—
—
✔
—
—
✔
—
—
✔
—
—
✔
—
—
✔
—
—
✔
✔
—
—
✔
—
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
MAX6354SYUK+T
Power Supply Support Circuit, Fixed, 2 Channel, PDSO5, LEAD FREE, MO-178AA, SOT-23, 5 PIN
MAXIM
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