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PDF CAT824 Data sheet ( Hoja de datos )
| Número de pieza | CAT824 | |
| Descripción | (CAT823 - CAT825) System Supervisory Voltage Reset | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT824 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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CAT823, CAT824, CAT825
System Supervisory Voltage Reset with
Watchdog and Manual Reset
FEATURES
Automatically restarts microprocessor after
Power failure
Monitors pushbutton for external override
Accurate under voltage system monitoring
www.DataSheet4U.cBomrownout detection system reset for use with
3.0, 3.3, and 5.0 volt systems
Pin and function compatible with the
MAX823/24/25 products
Operating Range from -40°C to +85°C
Available in TSOT-23 5-lead and SC-70 packages
For Ordering Information details, see page 13.
APPLICATIONS
Microprocessor and Microcontroller based
systems
Intelligent Instruments
Control Systems
Critical µP Monitors
Portable Equipment
DESCRIPTION
The CAT823, CAT824, and CAT825 provide basic
reset and monitoring functions for the electronic
systems. Each device monitors the system voltage
and maintains a reset output until that voltage reaches
the device’s specified trip value and then maintains
the reset output active condition until the device’s
internal timer, after a minimum timer of 140ms; to
allow the systems power supply to stabilize.
The CAT823 and CAT824 also have a watchdog input
which can be used to monitor a system signal and
cause a reset to be issued if the signal fails to change
state prior to a timeout condition.
The CAT823 and CAT825 also provide a manual
reset input which can be used to initiate reset if pulled
low. This input can be directly attached to a push-
button or a processor signal.
PIN CONFIGURATION
PIN FUNCTIONS
TSOT-23 5-Lead
SC-70 5-Lead
RESET 1
5 VCC RESET 1
5 VCC
GND 2 CAT823
GND 2 CAT824
MR 3
4 WDI RESET 3
4 WDI
RESET 1
5 VCC
GND 2 CAT825
RESET 3
4 MR
Pin Name
R¯¯E¯S¯E¯T¯
GND
¯M¯R¯
RESET
WDI
VCC
Function
CMOS Push-Pull Active Low Reset
Output
Ground
Manual Reset input – Pulled high
Internally by a 52kΩ resistor designed
to be driven low by a mechanical
pushbutton, open drain output or CMOS
output.
CMOS Push-Pull Active High Reset
Output
Watchdog Timer Input – Designed to be
driven by a processor output or can be
disabled by tri-stating or leaving open.
Power Supply
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-3027, Rev. B
1 page  
CAT823, CAT824, CAT825
ELECTRICAL OPERATING CHARACTERISTICS (continued)
DC Characteristics: VCC = 3.0V to 5.5V for L/M versions; VCC = 2.0V to 3.6V for the R/S/T/Y/Z version,
-40ºC ≤ TA ≤ +85ºC unless otherwise noted. Typical Values at TA = 25ºC and VCC = 5V for L/M versions;
VCC = 3.3V for the T/S versions; VCC = 3.0V for the R version; and VCC = 2.5V for the Y/Z versions.
Symbol Parameter
WATCHDOG INPUT (CAT823 & CAT824)
tWD Watchdog Timeout Period
tWDI WDI Pulse Width
VIL WDI Input Voltage(3)
VIH
www.DataSheet4U.com
WDI Input Current(4)
Conditions
VIL = 0.4V, VIH = 0.8 x VCC
WDI = VCC, Time Average
WDI = 0V, Time Average
Min Typ Max Units
1.12
50
1.60
0.7 x VCC
-20
120
-15
3.20
0.3 x VCC
160
s
ns
V
µA
MANUAL RESET INPUT(CAT823 & CAT825)
VIL
VIH
tPB
tPDLY
¯M¯R¯ Input Voltage
¯M¯R¯ Pulse Width
¯M¯R¯ low to Reset Delay
¯M¯R¯ Noise Immunity
Pulse Width with No Reset
¯M¯R¯ Pullup Resistance (internal)
0.7 x VCC
1
100
35 52
0.3 x VCC
5
75
V
µs
µs
ns
kΩ
Notes:
(3) WDI is internally serviced within the watchdog period if WDI is left open.
(4) The WDI input current is specified as an average input current when the WDI input is driven high or low. The WDI input if connected to a
three-stated output device can be disabled in the tristate mode as long as the leakage current is less than 10µA and a maximum
capacitance of less than 200pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200µA
when active.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-3027, Rev. B
5 Page 
PACKAGE OUTLINE DRAWING
TSOT-23 5-Lead (TD)(1)(2)
D
e
www.DataSheet4U.com
E1 E
TOP VIEW
CAT823, CAT824, CAT825
SYMBOL
A
A1
A2
b
c
D
E
E1
e
L
L1
L2
θ
MIN
0.01
0.80
0.30
0.12
0.30
0º
NOM
0.05
0.87
0.15
2.90 BSC
2.80 BSC
1.60 BSC
0.95 TYP
0.40
0.60 REF
0.25 BSC
MAX
1.00
0.10
0.90
0.45
0.20
0.50
8º
A2 A
b
SIDE VIEW
A1
θ
L
L1
END VIEW
c L2
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-193.
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. MD-3027, Rev. B
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT824.PDF ] | |
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