Spec. No. : C705P8
Issued Date : 2007.08.23
Revised Date :
CYStech Electronics Corp.
Page No. : 3/12
Pin Descriptions
Serial Data(SDA): The SDA pin used for sending and receiving data bits in serial mode. Since the SDA
pin is defined as an open-drain connection, a pull-up resistor is needed.
Serial Clock(SCL): The SCL input is used to synchronize data input and output with clocked out on the
falling edge of SCL.
Device/Page Addresses(A2, A1, A0): The A2, A1, and A0 pins are used to address multiple devices on a
single bus system and should be hard-wired.
● The CTK24BC01 and CTK24BC02 use the A2, A1 and A0 pins to provide the capability for
addressing up to eight 1K/2K devices on a single bus system (please see the Device Addressing
section for further details)
● The CTK24BC04 uses the A2 and A1 inputs and a total of for 4K device may be addressed on
a single bus system. The A0 pin is not used, but should be grounded if possible.
● The CTK24BC08 only uses the A2 input hardware addressing. On a single bus system, a total
of two 8K devices may be addressed. The A0 and A1 pins are not used, but should be grounded
if possible.
● The CTK24BC16 does not use the device address pins, so only one device can be connected to a
single bus system. Therefore, the A0, A1, and A2 pins are not used, but should be grounded if
possible.
Write Protect (WP): The CTK24BC01/02/04/08/16 has a Write Protect pin that provides hardware data
protection. When connected to ground, the Write Protect pin allows for normal read/write
operations. If the WP pin is connected to VCC, no data can be overwritten.
Memory Organization
The internal memory organization for the CTK24BC family is arranged differently for each of the densities.
The CTK24BC01, for instance, is internally organized as 16 pages of 8 bytes each and requires a 7-bit data
word address. The CTK24BC16, on the other hand, is organized as 128 pages of 16 bytes each with an
11-bit data word address. The table below summarizes these differences.
Density
# of pages
16 pages
32 pages
32 pages
64 pages
128 pages
Bytes per page
8 bytes
8 bytes
16 bytes
16 bytes
16 bytes
Data word address length
CTK24BC01 (1K)
CTK24BC02 (2K)
CTK24BC04 (4K)
CTK24BC08 (8K)
CTK24BC16 (16K)
7 bits
8 bits
9 bits
10 bits
11 bits
Pin Capacitance
Applicable over recommended operating range :TA=25℃, f=1MHz, VCC=+1.8V
Symbol
CI/O
CIN
Test Condition
Input/Output Capacitance (SDA)
Input Capacitance (A0, A1,A2, SCL)
Max
8
6
Unit
pF
pF
Condition
VI/O=0V
VIN=0V
Note : These parameters are characterized and not 100% tested.
CTK24BC01-16P8
CYStek Product Specification
CYSTEKEC [ CYSTECH ELECTONICS CORP. ]
