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CAT14008 Schematic ( PDF Datasheet ) - Catalyst Semiconductor

Teilenummer CAT14008
Beschreibung (CAT140xx) Voltage Supervisor
Hersteller Catalyst Semiconductor
Logo Catalyst Semiconductor Logo 




Gesamt 14 Seiten
CAT14008 Datasheet, Funktion
www.DataSheet4U.com
Voltage Supervisor with I2C Serial
CMOS EEPROM
CAT140xx
FEATURES
„ Precision Power Supply Voltage Monitor
ƒ 5V, 3.3V, 3V & 2.5V systems
ƒ 7 threshold voltage options
„ Active High or Low Reset
ƒ Valid reset guaranteed at VCC = 1 V
„ Supports Standard and Fast I2C Protocol
„ 16-Byte Page Write Buffer
„ Low power CMOS technology
„ 1,000,000 Program/Erase cycles
„ 100 year data retention
„ Industrial temperature range
„ RoHS-compliant 8-pin SOIC package
For Ordering Information details, see page 14.
PIN CONFIGURATION
SOIC (W)
CAT14016 / 08 / 04 / 02
NC / NC / NC / A0
NC / NC / A1 / A1
NC / A2 / A2 / A2
VSS
1
2
3
4
8 VCC
7 RST/RST
6 SCL
5 SDA
PIN FUNCTION
Pin Name
A0, A1, A2
SDA
SCL
RST/¯R¯S¯T¯
VCC
VSS
NC
Function
Device Address Inputs
Serial Data Input/Output
Serial Clock Input
Reset Output
Power Supply
Ground
No Connect
DESCRIPTION
The CAT140xx (see table below) are memory and
supervisory solutions for microcontroller based systems. A
CMOS serial EEPROM memory and a system power
supervisor with brown-out protection are integrated
together. Memory interface is via both the standard
(100kHz) as well as fast (400kHz) I2C protocol.
The CAT140xx provides a precision VCC sense circuit
with two reset output options: CMOS active low output
or CMOS active high. The RESET output is active
whenever VCC is below the reset threshold or falls
below the reset threshold voltage.
The power supply monitor and reset circuit protect
system controllers during power up/down and against
brownout conditions. Seven reset threshold voltages
support 5V, 3.3V, 3V and 2.5V 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 240ms after the supply
voltage exceeds the reset threshold level.
MEMORY SIZE SELECTOR
Product
14002
14004
14008
14016
Memory density
2-Kbit
4-Kbit
8-Kbit
16-Kbit
THRESHOLD SUFFIX SELECTOR
Nominal Threshold
Voltage
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
2.32V
Threshold Suffix
Designation
L
M
J
T
S
R
Z
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1117 Rev. A






CAT14008 Datasheet, Funktion
www.DataSheet4U.com
CAT140xx
EMBEDDED EEPROM OPERATION
The CAT140xx supports the Inter-Integrated Circuit
(I2C) Bus data transmission protocol, which defines a
device that sends data to the bus as a transmitter and
a device receiving data as a receiver. Data flow is
controlled by a Master device, which generates the
serial clock and all START and STOP conditions. The
CAT140xx acts as a Slave device. Master and Slave
alternate as either transmitter or receiver.
I2C BUS PROTOCOL
The I2C bus consists of two ‘wires’, SCL and SDA.
The two wires are connected to the VCC supply via
pull-up resistors. Master and Slave devices connect to
the 2-wire bus via their respective SCL and SDA pins.
The transmitting device pulls down the SDA line to
‘transmit’ a ‘0’ and releases it to ‘transmit’ a ‘1’.
Data transfer may be initiated only when the bus is not
busy (see A.C. Characteristics).
During data transfer, the SDA line must remain stable
while the SCL line is HIGH. An SDA transition while
SCL is HIGH will be interpreted as a START or STOP
condition (Figure 3). The START condition precedes
all commands. It consists of a HIGH to LOW transition
on SDA while SCL is HIGH. The START acts as a
‘wake-up’ call to all receivers. Absent a START, a
Slave will not respond to commands. The STOP
condition completes all commands. It consists of a
LOW to HIGH transition on SDA while SCL is HIGH.
START
The START condition precedes all commands.
It consists of a HIGH to LOW transition on SDA while
SCL is HIGH. The START acts as a ‘wake-up’ call to
all receivers. Absent a START, a Slave will not
respond to commands.
STOP
The STOP condition completes all commands.
It consists of a LOW to HIGH transition on SDA while
SCL is HIGH. The STOP starts the internal Write cycle
(when following a Write command) or sends the
Slave into standby mode (when following a Read
command).
Device Addressing
The Master initiates data transfer by creating a
START condition on the bus. The Master then
broadcasts an 8-bit serial Slave address. For normal
Read/Write operations, the first 4 bits of the Slave
address are fixed at 1010 (Ah). The next 3 bits are
used as programmable address bits when cascading
multiple devices and/or as internal address bits. The
last bit of the slave address, R/W, specifies whether a
Read (1) or Write (0) operation is to be performed.
The 3 address space extension bits are assigned as
illustrated in Figure 4. A2, A1 and A0 must match the
state of the external address pins, and a10, a9 and a8
are internal address bits.
Acknowledge
After processing the Slave address, the Slave
responds with an acknowledge (ACK) by pulling down
the SDA line during the 9th clock cycle (Figure 5). The
Slave will also acknowledge the address byte and
every data byte presented in Write mode. In Read
mode the Slave shifts out a data byte, and then
releases the SDA line during the 9th clock cycle. As
long as the Master acknowledges the data, the Slave
will continue transmitting. The Master terminates the
session by not acknowledging the last data byte
(NoACK) and by issuing a STOP condition. Bus timing
is illustrated in Figure 6.
Doc. No. 1117 Rev. A
6 © 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

6 Page









CAT14008 pdf, datenblatt
www.DataSheet4U.com
CAT140xx
PACKAGE OUTLINES
8-LEAD 150 MIL SOIC (W)
E1
E
D
A
e
b
A1
h x 45
q1
L
SYMBOL
A1
A
b
C
D
E
E1
e
h
L
q1
MIN
0.10
1.35
0.33
0.19
4.80
5.80
3.80
0.25
0.40
NOM
1.27 BSC
MAX
0.25
1.75
0.51
0.25
5.00
6.20
4.00
0.50
1.27
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters.
(2) Complies with JEDEC specification MS-012 dimensions.
C
Doc. No. 1117 Rev. A
12 © 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice

12 Page





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