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CAT1162P-25TE13 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT1162P-25TE13
Beschreibung Supervisory Circuits with I2C Serial CMOS EEPROM/ Precision Reset Controller and Watchdog Timer
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 12 Seiten
CAT1162P-25TE13 Datasheet, Funktion
CAT1161/2 (16K)
Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
FEATURES
s Watchdog monitors SDA signal (CAT1161)
s 400kHz I2C bus compatible
s 2.7V to 6.0V operation
s Low power CMOS technology
s 16-Byte page write buffer
s Built-in inadvertent write protection
— V lock out
CC
— Write protect pin, WP
s Active high or low reset
— Precision power supply voltage monitor
— 5V, 3.3V and 3V systems
— Five threshold voltage options
s 1,000,000 Program/Erase cycles
s Manual Reset
s 100 Year data retention
s 8-pin DIP or 8-pin SOIC
s Commercial and industrial temperature ranges
DESCRIPTION
The CAT1161/2 is a complete memory and supervisory
solution for microcontroller-based systems. A serial
EEPROM memory (16K) with hardware memory write
protection, a system power supervisor with brown out
protection and a watchdog timer are integrated together
in low power CMOS technology. Memory interface is via
an I2C bus.
The 1.6-second watchdog circuit returns a system to a
known good state if a software or hardware glitch halts
or “hangs” the system. The CAT1161 watchdog monitors
the SDA line, making an additional PC board trace
unnecessary. The lower cost CAT1162 does not have a
watchdog timer.
voltages support 5V, 3.3V and 3V systems. If power supply
voltages are out of tolerance reset signals become active,
preventing the system microcontroller, ASIC or peripherals
from operating. Reset signals become inactive typically 200
ms after the supply voltage exceeds the reset threshold
level. With both active high and low reset signals, interface
to microcontrollers and other ICs is simple. In addition, a
reset pin can be used as a debounced input for push-button
manual reset capability.
The CAT1161/2 memory features a 16-byte page. In addition,
hardware data protection is provided by a write protect pin
WP and by a VCC sense circuit that prevents writes to
memory whenever VCC falls below the reset threshold or
until VCC reaches the reset threshold during power up.
The power supply monitor and reset circuit protects Available packages include an 8-pin DIP and a surface
memory and system controllers during power up/down mount, 8-pin SO package.
and against brownout conditions. Five reset threshold
PIN CONFIGURATION
DC
RESET
WP
GND
CAT1161/2
VCC
RESET
SCL
SDA
DC = Do not connect
Part Dash Minimum Maximum
Number Threshold Threshold
-45 4.50 4.75
-42 4.25 4.50
-30 3.00 3.15
-28 2.85 3.00
-25 2.55 2.70
© 2002 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
BLOCK DIAGRAM
EXTERNAL LOAD
VCC
GND
DOUT
ACK
WORD ADDRESS
BUFFERS
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
SDA
WP
START/STOP
LOGIC
CONTROL
LOGIC
XDEC
16K
EEPROM
Only for
CAT1161
RESET Controller
Precision
WATCHDOG
Vcc Monitor
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
SCL
RESET RESET
Doc No. 3002, Rev. D






CAT1162P-25TE13 Datasheet, Funktion
CAT1161/2
Hardware Data Protection
The CAT1161/2 is designed with the following hardware
data protection features to provide a high degree of data
integrity.
(1) The CAT1161/2 features a WP pin. When the WP pin
is tied high the entire memory array becomes write
protected (read only).
(2) The VCC sense provides write protection when VCC
falls below the reset threshold value (VTH). The VCC lock
out inhibits writes to the serial EEPROM whenever VCC
falls below (power down) VTH or until VCC reaches the
reset threshold (power up) VTH. Any attempt to access
the internal EEPROM is not recognized and an ACK will
not be sent on the SDA line when RESET or RESET
is active.
Reset Threshold Voltage
The CAT1161/2 is offered with five reset threshold
voltage ranges. They are 4.50-4.75V, 4.25-4.50V, 3.00-
3.15V, 2.85-3.00V and 2.55-2.70V.
Figure 2. Bus Timing
tF tHIGH tR
tLOW
tLOW
SCL
tSU:STA
tHD:DAT
tHD:STA
tSU:DAT
SDA IN
SDA OUT
tAA tDH
tSU:STO
tBUF
Figure 3. Write Cycle Timing
SCL
SDA
8TH BIT
BYTE n
ACK
Figure 4. Start/Stop Timing
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
SDA
SCL
START BIT
STOP BIT
Doc. No. 3002, Rev. D
6

6 Page









CAT1162P-25TE13 pdf, datenblatt
Copyrights, Trademarks and Patents
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DPP ™ AE2
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents
issued to Catalyst Semiconductor contact the Company’s corporate office at 408.542.1000.
CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS
PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE
RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING
OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
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.
Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets
labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate
typical semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc.
Corporate Headquarters
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: 408.542.1000
Fax: 408.542.1200
www.catalyst-semiconductor.com
Publication #:
Revison:
Issue date:
Type:
3002
D
03/29/02
Final

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