FM1233ECS3X [ETC]
Analog IC ; 模拟IC\n
| 型号： | FM1233ECS3X |
| 厂家： | 
ETC |
| 描述： | Analog IC
|
| 文件： | 总7页 (文件大小：47K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 2001
FM1233E
3-Pin µC Supervisor Circuit
General Description
Features
The FM1233E is a supervisor circuit that monitors a microproces-
sor power supply or other system voltage and issues a reset pulse
when a fault condition exists. Several different threshold voltages
areofferedtoaccommodate3Vsystemswithdifferenttolerances.
I Precision monitoring of 3.3V and lower voltage
microprocessor systems
I VTH values of 2.88V, 2.72V
I Automatic restart of microprocessor after power failure
I 140ms (min) power-on RESET delay (typ.: 256ms)
I Internal 5kΩ pull-up resistor
The device features a precision temperature-compensated volt-
age reference and comparator. When VCC falls to the threshold
voltage, a RESET pulse is issued, holding the output in the active
state. When power rises above VTH, the reset remains for approxi-
mately 250 ms to allow the system clock and other circuits to
stabilize. The reset output of FM1233E is of open-drain active low
type.
I Other reset choices available: 32 to 128ms
I Operating Temperature -40°C to +105°C
I SOT23-3 package
Typical Operating Circuit
VCC
3
FM1233E
Controller
1
2
/RESET
GND
Connection Diagram
1
2
GND
3
VCC
FM1233E
/RESET
SOT23-3 Package
1
© 2001 Fairchild Semiconductor Corporation
FM1233E Rev. B
www.fairchildsemi.com
Absolute Maximum Ratings
Voltage on any pin relative to GND
Continuous Power Dissipation (TA = 70°C)
SOT23 (derate 4mW above 70°C)
VCC
/RESET
-0.3V to +6.0V
-0.3V to (VCC + 0.3V)
300mW
-40°C to +105°C
-65°C to +150°C
+300°C
Operating Temperature Range
Storage Temperature Range
Lead Temperature (soldering, 10s)
Input Current
20mA
Output Current (/RESET)
20mA
These are stress ratings only, and functional operation is not implied for these levels or beyond. Exposure to Absolute Maximum Rating
conditions for extended periods may affect device reliability.
Electrical Characteristics (VCC = 3.3V; TA = -40°C to +105°C unless otherwise noted) (Note 1)
Parameter
Operating Voltage
Supply Current
Symbol
VCC
Conditions
Min
Typ
3.3
3
Max
5.5
6
Units
V
1.2
ICC
VCC < 3.3V
µA
Reset Threshold
VTH
FM1233EC
2.70
2.88
2.72
2.97
2.86
V
Reset Threshold
VTH
VOH
FM1233ED
FM1233E
2.58
V
V
Reset Output Voltage
ISOURCE = 150 µA
VCC = VTH(max)
0.8VCC
Reset Output Voltage
Reset Timeout Period
VOL
FM1233E
FM1233E
ISINK = 5mA
VCC = VTH(min)
0.4
V
tRST
140
256
560
ms
Note 1: Testing at production is done at 25°C only. Limits over temperature are guaranteed by design.
2
www.fairchildsemi.com
FM1233E Rev. B
Typical Operating Characteristics
Supply Current Vs. Temperature
10
8
10
8
6
6
4
4
V
= 3.3V
CC
2
0
2
0
-55C
+25C
+110C
Temperature (C)
Power up Reset Timeout Vs. Temperature
600
600
500
400
300
200
100
500
400
300
200
100
-40C
+25C
+105C
Temperature (C)
3
www.fairchildsemi.com
FM1233E Rev. B
Pin Descriptions
Pin Number
Name
GND
Function
1
GROUND
2
/RESET
/RESET remains LOW while VCC is below
VTH, and for at least 140ms after VCC rises
above VTH
.
3
VCC
Circuit Timing (Ex: FM1233E)
V
CC
3.3V
V
TH
1V
GND
RESET
3.3V
V
TH
1V
GND
140ms
When operating properly with 3V VCC (for example), /RESET will
also be about 3V. When VCC starts to fall, /RESET will follow it
down as shown. When VCC drops below VTH, /RESET drops to
ground ("issues a RESET") and stays there unless VCC also falls
belowitsminimumoperatingvoltage, approx. 1V. Atthispoint, the
supervisor loses control, and its output may rise, only to again
follow VCC down to the ground.
When VCC begins to rise, /RESET follows it until 1.0V or so is
reached, whereupon the device regains control, /RESET is pulled
to ground, etc. When VCC rises above VTH, /RESET comes out of
RESET 140 ms later.
If it is required that a lower value than GND + 1.0V is needed on
RESET signal during VCC ≤ 1V, a 100K resistor may be used on
the device output to GND.
4
www.fairchildsemi.com
FM1233E Rev. B
General Description
The FM1233E features a highly accurate voltage reference to
which VCC is compared. Once VCC is below the specified thresh-
old, itwilldrivethe/RESETlineandcontinuetoholditlowuntilVCC
returns above the threshold and the time for the RESET pulse
duration has expired. The FM1233E is immune to short negative
going transients on the VCC line. The placement of a 0.1µF bypass
capacitor as close as possible to the VCC pin provides additional
transient immunity.
For a VCC value below 1.0V, the FM1233E does not sink very
much current on the /RESET pin. This is not a problem in most
systems since common devices are not functional in this range. If
it is desired for the FM1233E reset to be functional below this
range, use a 100KΩ pull-down resistor between /RESET and VSS
.
5
www.fairchildsemi.com
FM1233E Rev. B
Ordering Information
Part
Number
Top
RESET
Output
Type
Package
Type
Packing
Method
Marking Threshold (V)
FM1233ECS3X
3EC
2.88
Open-Drain, active LOW
3-Pin, SOT23
3000 units in T&R
FM1233EDS3X
3ED
2.72
Open-Drain, active LOW
3-Pin, SOT23
3000 units in T&R
Note 3: Devices listed above feature 250ms typical reset pulse width. Consult Fairchild Sales for other reset pulse width options.
6
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FM1233E Rev. B
Physical Dimensions inches (millimeters) unless otherwise noted
0.40 0.03
0.03~0.10
0.38 REF
+0.05
–0.023
0.40 0.03
0.12
0.96~1.14
2.90 0.10
0.95 0.03 0.95 0.03
1.90 0.03
0.508REF
SOT-23 Package Dimensions
FS Pkg Code AU
Life Support Policy
Fairchild's products are not authorized for use as critical components in life support devices or systems without the express written
approval of the President of Fairchild Semiconductor Corporation. As used herein:
1. Life support devices or systems are devices or systems which,
(a)areintendedforsurgicalimplantintothebody,or(b)support
or sustain life, and whose failure to perform, when properly
used in accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a significant
injury to the user.
2. A critical component is any component of a life support device
or system whose failure to perform can be reasonably ex-
pected to cause the failure of the life support device or system,
or to affect its safety or effectiveness.
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Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.
7
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FM1233E Rev. B
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