cat825ztdi-g Catalyst Semiconductor, cat825ztdi-g Datasheet

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cat825ztdi-g

Manufacturer Part Number
cat825ztdi-g
Description
System Supervisory Voltage Reset With Watchdog And Manual Reset
Manufacturer
Catalyst Semiconductor
Datasheet
RESET
GND
System Supervisory Voltage Reset with
Watchdog and Manual Reset
FEATURES
APPLICATIONS
PIN CONFIGURATION
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
MR
For Ordering Information details, see page 13.
Automatically restarts microprocessor after
Power failure
Monitors pushbutton for external override
Accurate under voltage system monitoring
Brownout 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
Microprocessor and Microcontroller based
systems
Intelligent Instruments
Control Systems
Critical µP Monitors
Portable Equipment
1
2
3
CAT823
RESET
RESET
GND
TSOT-23 5-Lead
5
4
1
2
3
SC-70 5-Lead
VCC
WDI
CAT825
RESET
RESET
GND
5
4
1
2
3
VCC
MR
CAT824
5
4
VCC
WDI
1
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 FUNCTIONS
Pin Name
RESET
RESET
¯¯¯¯¯¯
GND
WDI
¯¯¯
V
MR
CC
CAT823, CAT824, CAT825
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
Doc. No. MD-3027, Rev. A

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cat825ztdi-g Summary of contents

Page 1

... RESET 2 GND CAT825 3 RESET © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT823, CAT824, CAT825 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’ ...

Page 2

... Device RESET RESET CAT823 x x CAT824 CAT825 Doc. No. MD-3027, Rev. A TIMEOUT COMPARATOR DIGITAL + DELAY – LEVEL SENSE & DEBOUNCE WDI RESET V CC RESET* © Catalyst Semiconductor, Inc. Characteristics subject to change without notice ...

Page 3

... Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice (1) = +70º ...

Page 4

... Y/Z versions. Min Typ Max 4.50 4.63 4.75 4.25 4.38 4.50 3.00 3.08 3.15 2.85 2.93 3.00 2.55 2.63 2.70 2.25 2.32 2.38 2.13 2.19 2. 140 200 400 V - 1. 0.4 0.3 0.3 0.3 1.5 0.8 0 0.4 0.3 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice Units µA µA µA µ ppm/º µ ...

Page 5

... 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 = 2.0V to 3.6V for the R/S/T/Y/Z version, ...

Page 6

... Supply Current vs. Temperature -40 - TEMPERATURE (ºC) Doc. No. MD-3027 Rev. A 1.06 1.04 1.02 1.00 0.98 0.96 0.94 -40 80 100 120 6 Normalized Reset Threshold Voltage vs. Temperature - 100 TEM PERATURE (ºC) TEMPERATURE (°C) © Catalyst Semiconductor, Inc. Characteristics subject to change without notice ...

Page 7

... Figure 1. Pushbutton RESET Figure 2. Timing Diagram – Pushbutton RESET MR V RESET RESET © Catalyst Semiconductor, Inc. Characteristics subject to change without notice MANUAL RESET voltage (V ) The CAT823 and CAT825 each have a Manual Reset CC ¯ ...

Page 8

... MR PIC GND µC RESET MCLR V Tristate 150kΩ CAT823 WDI 110kΩ and pulled high for the watchdog period. This pulling low DECODER ADDRESS µC OUTPUT © Catalyst Semiconductor, Inc. Characteristics subject to change without notice ...

Page 9

... Figure 5. Timing Diagram – Strobe Input INVALID STROBE WDI RESET Figure 6. Timing Diagram – Power Down RESET RESET (CAT824 & CAT825) Figure 7. Timing Diagram – Power © Catalyst Semiconductor, Inc. Characteristics subject to change without notice VALID STROBE t WD (MAX) RST V RST V (MIN) RST t ...

Page 10

... These issues can CC MR 100kΩ GND RESET 10 of 1.0 volts ¯¯¯¯¯¯ ¯¯¯¯¯¯ output is in the high state. A equal to 0V. CC µC RESET © Catalyst Semiconductor, Inc. Characteristics subject to change without notice This ...

Page 11

... TSOT-23 5-Lead (TD TOP VIEW b SIDE VIEW 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 MO-193. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice SYMBO L MIN A A1 0.01 A2 0. ...

Page 12

... Complies with JEDEC MO-203. Doc. No. MD-3027 Rev. A SYMBOL θ θ θ MIN NOM MAX 0.80 1.10 0.00 0.10 0.80 1.00 0.15 0.30 0.10 0.18 1.80 2.00 2.20 1.80 2.10 2.40 1.15 1.25 1.35 0.65 BSC 0.26 0.36 0.46 0.42 REF 0.15 BSC 0° 8° 4° 10° END VIEW © Catalyst Semiconductor, Inc. Characteristics subject to change without notice ...

Page 13

... 4.63V M: 4.38V T: 3.08V S: 2.93V R: 2.63V Z: 2.32V Y: 2.19V Top Marking SC-70 RG SC-70 TB SC-70 TD (4) CAT825LTDI-G (4) CAT825MTDI-G (4) CAT825TTDI-G (4) CAT825STDI-G (4) CAT825RTDI-G (4) CAT825ZTDI-G (4) CAT825YTDI-G (4) CAT825LSDI-G (4) CAT825MSDI-G (4) CAT825TSDI-G (4) CAT825SDI-G (4) CAT825RSDI-G (4) CAT825ZSDI-G (4) CAT825YSDI-G 13 CAT823, CAT824, CAT825 -G T3 Lead Finish Tape & Reel G:NiPdAu T: Tape & Reel 3: 3000/Reel 40ºC to 85ºC) ...

Page 14

... Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. ...

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