CYT809MS [ETC]
3-Pin Microprocessor Reset Monitor (Preliminary); 3引脚微处理器复位监控器（初步）
| 型号： | CYT809MS |
| 厂家： | 
ETC |
| 描述： | 3-Pin Microprocessor Reset Monitor (Preliminary) |
| 文件： | 总4页 (文件大小：170K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
3-Pin Microprocessor
Reset Monitor
CYT809
(Preliminary)
Description
Features
The CYT809 is
a
cost-effective system
ꢀ
Precision VCC Monitor for 2.8V, 3.0V, 3.3V, and
5.0V Supplies
supervisor Integrated Circuit (IC) designed to
monitor VCC in digital and mixed signal systems and
supply is out of working range, and a reset signal to
the host processor when necessary. No external
components are required.
ꢀ
140msec Guaranteed Minimum RESET Output
Duration
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
RESET Output Guaranteed to VCC=1.0V
Low 18µA Supply Current
VCC Transient Immunity
The reset output is driven active within 20µsec
of VCC falling through the reset voltage threshold.
Reset is maintained active for a minimum of
140msec after VCC rises above the reset threshold.
The CYT809 has an active-low RESET output. The
output of the CYT809 is guaranteed valid down to
VCC=1V. Both devices are available in a SOT-23
package.
Small SOT-23 Package
No External Components
Wide Operating Temperature: 0°C to 85°C
Application
ꢀ
ꢀ
ꢀ
ꢀ
Computers
The CYT809 is optimized to reject fast transient
glitches on the VCC line. Low supply current of 18µA
(VCC=3.3V) makes these devices suitable for battery
powered applications.
Embedded systems
Battery powered equipment
Critical µP power supply monitoring
Application Diagram
Pin Configuration
Vcc
Vcc
Vcc
PROCESSOR
CYT809
RESET
INPUT
RESET
GND
GND
Preliminary and all contents are subject to change without prior notice.
1
3-Pin Microprocessor
Reset Monitor
CYT809
(Preliminary)
Ordering/Marking Information
Ordering Information
Marking Information
Starting with 8, a bar on top of 8 is for production
year 2003, and underlined 1 is for year 2004. The
•
CYT809xS
C809xa
next character is marked on top for 2005, and
underlined for 2006. The naming pattern continues
with consecutive characters for later years.
The “x” denotes a suffix for VCC threshold .
Suffix
Reset VCC threshold(V)
L
M
J
4.63
4.38
4.00
3.08
2.93
2.63
The last character is the week code. (A-Z: 1-26,
a-z: 27-52)
A dot on top right corner is for lead-free process.
T
S
R
Absolute Maximum Ratings(1)
Parameter
Symbol
VCC
Value
Units
V
Input Voltage
5.5
Output Voltage
RESET
--
-0.3 to (VCC + 0.3)
V
Input Current
20
20
mA
mA
Output Current
IOUT
Power Dissipation
PD
Internally Limited (3)
Output Short Circuit Duration
Thermal Resistance, Junction-to-Ambient
Operating Temperature Range
Lead Temperature (Soldering, 10 sec.)
Junction Temperature
Storage Temperature
Infinite
ΘJA
230
°C/W
℃
TA
0 ~ 85
260
°C
TJ
0 to +125
-60 to +150
°C
TS
°C
Operating Rating(2)
Parameter
Symbol
VCC
Value
Units
Supply Input Voltage
Junction Temperature
+2.0V to +5.5
0 to +125
V
TJ
°C
Preliminary and all contents are subject to change without prior notice.
2
3-Pin Microprocessor
Reset Monitor
CYT809
(Preliminary)
Electrical Characteristics
Vcc=5V for L/M/J ;3.3V for T/S ;3.0V for R ,TA = 25°C, unless otherwise specified.
Symbol
VCC
Parameter
Input Voltage
Supply Current
Condition
Min
2.0
--
Typ
Max
Unit
V
5.5
25
ICC
18
µA
CYT809Lxx :
CYT809Mxx :
CYT809Jxx :
CYT809Txx :
CYT809Sxx :
CYT809Rxx :
4.54
4.29
3.92
3.02
2.87
2.58
4.63
4.38
4.00
3.08
2.93
2.63
4.72
4.47
4.08
3.14
2.99
2.68
VTH
Reset Threshold
V
Reset Threshold Temperature
Coefficient(4)
--
--
30
20
--
--
ppm/°C
µsec
VCC to Reset Delay VCC = VTH to (VTH
100mV)
–
Reset Active Timeout Period
RESET Output Voltage Low
RESET Output Voltage High
140 240
600
0.4
--
msec
VOL
VOH
ISINK = 3mA
--
--
--
V
V
ISOURCE = 800µA
0.8VCC
PIN DESCRIPTION:
Pin No.
Symbol
Description
Ground
RESET output remains low while Vcc is below the reset voltage
1
2
GND
RESET
threshold and for 240msec(typ) after Vcc rises above reset threshold
Supply Voltage (typ.)
3
Vcc
Note 1: Exceeding the absolute maximum rating may damage the device.
Note 2: The device is not guaranteed to function outside its operating rating.
Note 3: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(MAX)
=
(TJ(MAX) – TA)/Θ . Exceeding the maximum allowable power dissipation will result in excessive die temperature,
JA
and the regulator will go into thermal shutdown. See “Thermal Consideration” section for details
Note 4: RESET threshold temperature coefficient is the worst case voltage change divided by the total temperature
range.
Preliminary and all contents are subject to change without prior notice.
3
3-Pin Microprocessor
Reset Monitor
CYT809
(Preliminary)
OUTLINE DRAWING SOT-23
C
DIMENSIONS
INCHES
J
H
B
MM
N
DIM
MIN MAX MIN MAX
0.110 0.120 2.80
0.047 0.055 1.20
0.083 0.104 2.10
0.035 0.040 0.89
0.070 0.080 1.78
0.018 0.024 0.45
0.015 0.020 0.37
3.04
1.40
2.64
1.03
2.05
0.60
0.51
B
D
A
E
D
G
F
G
H
0.0005 0.004 0.013 0.10
1.02
0.18
K
K
L
L
-
-
0.69
Preliminary and all contents are subject to change without prior notice.
4
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