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CAT24WC66JA-1.8TE13 Datasheet(PDF) 4 Page - Catalyst Semiconductor

Part # CAT24WC66JA-1.8TE13
Description  64K-Bit I2C Serial CMOS EEPROM
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Manufacturer  CATALYST [Catalyst Semiconductor]
Direct Link  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT24WC66JA-1.8TE13 Datasheet(HTML) 4 Page - Catalyst Semiconductor

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CAT24WC66
4
Doc. No. 1037, Rev. H
FUNCTIONAL DESCRIPTION
The CAT24WC66 supports the I2C Bus data transmission
protocol. This Inter-Integrated Circuit Bus protocol defines
any device that sends data to the bus to be a transmitter
and any device receiving data to be a receiver. The
transfer is controlled by the Master device which
generates the serial clock and all START and STOP
conditions for bus access. The CAT24WC66 operates
as a Slave device. Both the Master device and Slave
device can operate as either transmitter or receiver, but
the Master device controls which mode is activated.
PIN DESCRIPTIONS
SCL: Serial Clock
The serial clock input clocks all data transferred into or
out of the device.
SDA: Serial Data/Address
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA pin
is an open drain output and can be wire-ORed with other
open drain or open collector outputs.
A0, A1, A2: Device Address Inputs
These pins are hardwired or left unconnected (for
hardware compatibility with CAT24WC16).
When
hardwired, up to eight CAT24WC66 devices may be
addressed on a single bus system (refer to Device
Addressing ). When the pins are left unconnected, the
default values are zeros.
WP: Write Protect
This input, when tied to GND, allows write operations to
the entire memory. When this pin is tied to Vcc, the top
1/4 array of memory is write protected.
When left
floating, memory is unprotected.
Figure 3. Start/Stop Timing
Figure 2. Write Cycle Timing
Figure 1. Bus Timing
START BIT
SDA
STOP BIT
SCL
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
ACK
8TH BIT
BYTE n
SCL
SDA
tHIGH
SCL
SDA IN
SDA OUT
tLOW
tF
tLOW
tR
tBUF
tSU:STO
tSU:DAT
tHD:DAT
tHD:STA
tSU:STA
tAA
tDH


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