FM1233JE [FAIRCHILD]
Power Management Circuit, Fixed, +4VV, CMOS,;
| 型号： | FM1233JE |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Power Management Circuit, Fixed, +4VV, CMOS, |
| 文件： | 总6页 (文件大小：44K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 2000
FM1233
Precision Reset Generator Circuit
General Description
Features
The FM1233 features comprehensive reset generation for
microcontroller/microprocessorbasedsystems. IfthesystemVCC
voltage level is determined to be in an out-of-tolerance state, the
device automatically generates a low-going reset signal. The
reset signal is held in the active state (low) for a specified duration
(minimum 140 ms) after the VCC returns to an in-tolerance state.
I Automaticresetgenerationonpower-up
I Minimum 140 ms reset pulse — compatible with other similar
1233 class devices
I Other reset pulse choices available: 32 - 256 ms
I Choice of commercial and extended temperature ranges
I Choice of Reset Thresholds: 4.63V, 4.38V, 4.00V, 3.08V,
2.93V, 2.63V
The FM1233 also allows an external reset to be connected to the
reset pin without adding aditional debounce logic or extra pins.
I Package available: SOT-23
This device is fabricated using CMOS technology. This device is
available in the SOT-23 package.
Block Diagram
VCC
Reset_out
(active low)
VCC Tolerance Detect
& Reset Monitor
Output
Stage
External Reset
Detection
Temp. Compensated
Reference
Connection Diagram
1
1 = GND
2 = RESET'
3 = VCC
FM1233
3
2
1
© 2000 Fairchild Semiconductor International
FM1233 Rev. A
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Each FM1233 device has the following Identifier (FM1233yz) (Top Mark on devices will be 10yz)
Reset Characteristics
RESET THRESHOLD (V) Identifier(y) Fairchild Part Number
4.63
4.38
4.00
3.08
2.93
2.63
L
M
J
FM1233Lz
FM1233Mz
FM1233Jz
FM1233Tz
FM1233Sz
FM1233Rz
T
S
R
RESET PULSE DURATION (mS) Identifier(z) Fairchild Part Number
32
64
E
F
FM1233yE*
FM1233yF*
FM1233yH*
FM1233y
128
256
H
Blank
Note*: These choices are available upon special request only. Please work with Fairchild Marketing to determine availability.
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FM1233 Rev. A
Product Specifications
Absolute Maximum Ratings
Ambient Storage Temperature
Operating Conditions
Ambient Operating Temperature
–65°C to +150°C
Commercial
Industrial
0°C to +70°C
-40°C to +85°C
All Input or Output Voltages
with Respect to Ground
-0.3V to 6.5V
+300°C
Lead Temperature (Soldering, 10 seconds)
ESD Rating
2000V min.
Electrical Characteristics
Parameter
Symbol
Temp
Com
Ind
Conditions
Min
1.0
Typ
Max Units
VCC Range
5.5V
5.5
V
V
1.2
SupplyCurrent
ICC
Com
50
µA
µA
V
100
ResetThreshold
VTH
Com
Ind
‘L’Identifier
‘M’Identifier
‘J’Identifier
‘T’Identifier
‘S’Identifier
‘R’Identifier
4.50
4.40
4.25
4.16
3.89
3.80
3.00
2.92
2.85
2.78
2.55
2.50
0.8VCC
0.4
4.63
4.63
4.38
4.38
4.00
4.00
3.08
3.08
2.93
2.93
2.63
2.63
4.75
4.85
4.50
4.56
4.10
4.20
3.15
3.23
3.00
3.08
2.70
2.75
V
Com
Ind
V
V
Com
Ind
V
V
Com
Ind
V
V
Com
Ind
V
V
Com
Ind
V
V
nRESET Output Voltage High
nRESET Output Voltage Low
ResetTimeoutPeriod
VOH
VOL
All
Isource = 150 mA
Isink = 1.2mA
V
All
V
TRST
All
175
240
375
ms
Note: Production testing done at TA = +25°C, over temperature limits guaranteed by design only.
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FM1233 Rev. A
Connecting an External Reset to the FM1233
General Description
The FM1233 features a highly accurate voltage reference against
which the Vcc is compared. Once the Vcc is below the specified
threshold, it will drive the RESET line and continue to hold it low
until the VCC returns above the threshold and the time for the
RESETpulsedurationhasexpired.TheFM1233isimmunetoshort
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.
FM1233
Reset
ForaVCC valuebelow1.0V-1.3V,theFM1233doesnotsinkcurrent
on the RESET pin. This is not a problem in most systems since
mostcommondevicesarenotfunctionalinthisrange.Ifitisdesired
for the FM1233 reset to be functional below the range above, it is
suggestedtousea100KΩpull-downresistorbetweenRESETand
Interfacing to Bidirectional reset pins
VSS
.
FM1233canbeusedwithmicroprocessorswithbidirectionalreset
pins.Themicroprocessorscanstilldrivetheresetlinebutwhenthe
microprocessor has released the reset line the FM1233 will
continue to hold it for a duration no longer that 300 ms.
Bi-Directional Reset
The FM1233 allows for the connection of an external reset switch
tobewiredtotheresetpin. TheFM1233hasthefeatureofallowing
an external reset pin to be connected without having to add
debouncelogicoranextrapintothepackage. TheFM1233detects
when an external source is pulling the reset line low. Once this
occurs the FM1233 will pull the reset line low as well. When the
externalsourcestopsdrivingtheresetlinetheFM1233willcontinue
toholdtheresetlinelowsoastopreventdebounce. Afteracertain
length of time the FM1233 will stop driving the reset line and it will
return to its non-active (high) state.
4
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FM1233 Rev. A
Typical Operating Characteristics
Supply Current Vs. Temperature (FM1233R/S/T)
8
7
6
5
VCC = 5V
4
3
2
1
0
VCC = 3.3V
-60
-40
-20
0
20
40
60
80
100
Temperature (C)
Power up Reset Timeout Vs. Temperature FM1233(R/S/T)
300
280
260
240
220
200
-60
-40
-20
0
20
40
60
80
100
Temperature (C)
Normalized Reset Threshold Vs. Temperature FM1233(R/S/T)
1.050
1.025
1.000
0.975
0.950
-60
-40
-20
0
-20
-40
60
80
100
Temperature (C)
5
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FM1233 Rev. A
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
Dimensions in millimeters
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.
6
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FM1233 Rev. A
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