CATALYST CAT24C208

CAT24C208
8-Kb Dual Port Serial EEPROM
FEATURES
DESCRIPTION
■ Supports Standard and Fast I2C protocol*
The CAT24C208 is an 8-Kbit Dual Port Serial CMOS
EEPROM internally organized as 4 segments of 256
bytes each. The CAT24C208 features a 16-byte page
write buffer and can be accessed from either of two
separate I2C compatible ports, DSP (SDA, SCL) and
DDC (SDA, SCL).
■ 2.5V to 5.5V operation
■ 16-byte page write buffer
■ Schmitt triggers and noise protection filters
on I2C bus input
■ Low power CMOS technology
Arbitration between the two interface ports is automatic
and allows the appearance of individual access to the
memory from each interface.
■ 1,000,000 program/erase cycles
■ 100 year data retention
■ Industrial temperature range
■ RoHS-compliant 8-lead SOIC package
For Ordering Information details, see page 12.
BLOCK DIAGRAM
DSP VCC
DDC VCC
ARBITRATION
LOGIC
DSP SCL
DSP SDA
DISPLAY
CONTROL
LOGIC
VSS
D
E
C
O
D
E
R
S
1K X 8
MEMORY
ARRAY
CONFIGURATION
REGISTER
D
E
C
O
D
E
R
S
DDC
CONTROL
LOGIC
DDC SCL
DDC SDA
EDID SEL
* Catalyst Semiconductor is licensed by Philips Corporation to carry the I2C Bus Protocol.
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 1044, Rev. F
CAT24C208
PIN CONFIGURATION
SOIC (W)
1
2
3
4
DSP VCC
DSP SCL
DSP SDA
VSS
8
7
6
5
DDC VCC
EDID SEL
DDC SCL
DDC SDA
PIN DESCRIPTION
Pin Number
Pin Name
1
DSP VCC
Device power from display controller
2
DSP SCL
The CAT24C208 DSP serial clock bidirectional pin is used to clock all
data transfers into or out of the device DSP SDA pin and is also used to
block DSP Port access when DDC Port is active.
3
DSP SDA
DSP Serial Data/Address. The bidirectional DSP serial data/address pin
is used to transfer data into and out of the device from a display
controller. The DSP SDA pin is an open drain output and can be wireOR'ed with other open drain or open collector outputs.
4
VSS
5
DDC SDA
DDC Serial Data/Address. The bidirectional DDC serial data/address
pin is used to transfer data into and out of the device from a DDC host.
The DDC SDA pin is an open drain output and can be wire-OR'ed with
other open drain or open collector outputs.
6
DDC SCL
The CAT24C208 DDC serial clock bidirectional pin is used to clock all
data transfers into or out of the device DDC SDA pin, and is used to
block DDC Port for access when DSP Port is active.
7
EDID SEL
EDID select. The CAT24C208 EDID select input selects the active bank
of memory to be accessed via the DDC SDA/SCL interface as set in
the configuration register.
8
DDC VCC
Doc. No. 1044, Rev. F
Function
Device ground.
Device power when powered from a DDC host.
2
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT24C208
ABSOLUTE MAXIMUM RATINGS(1)
Temperature Under Bias .................. -55°C to +125°C
Package Power Dissipation
Capability (TA = 25°C) ................................... 1.0W
Storage Temperature ........................ -65°C to +150°C
Lead Soldering Temperature (10 secs) ............ 300°C
Voltage on Any Pin with
Respect to Ground(2) ............ -2.0V to +VCC + 2.0V
Output Short Circuit Current(3) ........................ 100mA
VCC with Respect to Ground ................ -2.0V to +7.0V
Reliability Characteristics
Symbol
Parameter
NEND(4)
Endurance
MIL-STD-883, Test Method 1033 1,000,000
Data Retention
MIL-STD-883, Test Method 1008
100
Years
JEDEC Standard JESD 22
2000
Volts
JEDEC Standard 17
100
mA
TDR(4)
VZAP
(4)
ILTH(4)(5)
ESD Susceptibility
Reference Test Method
Latch-up
Min
Typ
Max
Units
Cycles/Byte
D.C. OPERATING CHARACTERISTICS
VCC = 2.5V to 5.5V, unless otherwise specified.
Symbol Parameter
Test Conditions
Min
Ty p
Max
Units
fSCL = 100 KHz
3
mA
ICC
Power Supply Current
ISB
Standby Current (VCC = 5.0V)
VIN = GND or either
DSP or DDC VCC
50
µA
ILI
Input Leakage Current
VIN = GND to either
DSP or DDC VCC
10
µA
ILO
Output Leakage Current
VOUT = GND to either
DSP or DDC VCC
10
µA
VIL
Input Low Voltage
– 1
VCC x 0.3
V
VIH
Input High Voltage
VCC x 0.7
VCC + 0.5
V
VHYS
Input Hysteresis
VOL1
Output Low Voltage (VCC = 3V)
VCCL1
VCCL2
0.05
IOL = 3 mA
V
0.4
V
Leakage DSP VCC to DDC VCC
+100
µA
Leakage DDC VCC to DSP VCC
+100
µA
Note:
(1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) The minimum DC input voltage is –0.5V. During transitions, inputs may undershoot to –2.0V for periods of less than 20 ns. Maximum DC
voltage on output pins is VCC +0.5V, which may overshoot to VCC + 2.0V for periods of less than 20ns.
(3) Output shorted for no more than one second. No more than one output shorted at a time.
(4) This parameter is tested initially and after a design or process change that affects the parameter.
(5) Latch-up protection is provided for stresses up to 100 mA on address and data pins from –1V to VCC +1V.
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
3
Doc No. 1044, Rev. F
CAT24C208
CAPACITANCE TA = 25°C, f = 1.0 MHz, VCC = 5V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
CI/O(1)
Input/Output Capacitance (Either DSP or DDC SDA)
VI/O = 0V
8
pF
CIN(1)
Input Capacitance (EDID, Either DSP or DDC SCL)
VIN = 0V
6
pF
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
A.C. CHARACTERISTICS
VCC = 2.5V to 5.5V, unless otherwise specified.
Read & Write Cycle Limits
Symbol
Parameter
Min
Max
Units
FSCL
Clock Frequency
400
kHz
TI(1)
Noise Suppression Time Constant at SCL, SDA Inputs
100
ns
tAA
SCL Low to SDA Data Out and ACK Out
0.9
µs
tBUF(1)
Time the Bus Must be Free Before a New Transmission
Can Start
1.3
µs
tHD:STA
Start Condition Hold Time
0.6
µs
tLOW
Clock Low Period
1.3
µs
tHIGH
Clock High Period
0.6
µs
tSU:STA
Start Condition Setup Time (for a Repeated Start
Condition)
0.6
µs
tHD:DAT
Data In Hold Time
0
ns
tSU:DAT
Data In Setup Time
100
ns
tR(1)
(1)
tF
tSU:STO
tDH
SDA and SCL Rise Time
300
ns
SDA and SCL Fall Time
300
ns
Stop Condition Setup Time
0.6
µs
Data Out Hold Time
100
ns
Note:
(1) This parameter is tested initially and after a design or process change that affects the parameter.
(2) tPUR and tPUW are the delays required from the time VCC is stable until the specified operation can be initiated.
Power-Up Timing(1)(2)
Symbol
Parameter
Min
Typ
Max
Units
tPUR
Power-up to Read Operation
1
ms
tPUW
Power-up to Write Operation
1
ms
Max
Units
5
ms
Write Cycle Limits
Symbol
tWR
Parameter
Min
Write Cycle Time
Typ
The write cycle time is the time from a valid stop condition of a write sequence to the end of the internal program/erase
cycle. During the write cycle, the bus interface circuits are disabled, SDA is allowed to remain high, and the device does
not respond to its slave address.
Doc. No. 1044, Rev. F
4
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT24C208
interface, the memory space appears as two 512 byte
banks of memory, with 2 segments each 00h and 01h in
the upper and lower bank, see Table 1.
FUNCTIONAL DESCRIPTION
The CAT24C208 has a total memory space of 1K bytes
which is accessible from either of two I2C interface
ports, (DSP_SDA and DSP_SCL) or (DDC_SDA and
DDC_SCL), and with the use of segment pointer at
address 60h. On power up and after any instruction, the
segment pointer will be in segment 00h for DSP and in
segment 00h of the bank selected by the configuration
register for DDC.
Each bank of memory can be used to store an E-EDID
data structure. However, only one bank can be read
through the DDC port at a time. The active bank of
memory (that is, the bank that appears at address A0h
on the DDC port) is controlled through the configuration
register at 62/63h and the EDID_SEL pin.
No write operations are possible from the DDC interface
unless the DDC Write Enable bit is set (WE = 1) in the
device configuration register at device address 62h.
The entire memory appears as contiguous memory
space from the perspective of the display interface
(DSP_SDA and DSP_SCL), see Table 2, and Figures
11 to Figure 18 for a complete description of the DSP
Interface.
The device automatically arbitrates between the two
interfaces to allow the appearance of individual access
to the memory from each interface.
A configuration register at addresses 62/63h is used to
configure the operation and memory map of the device
as seen from the DDC interface, (DDC_SDA and
DDC_SCL).
In a typical E-EDID application the EDID_SEL pin is
usually connected to the “Analog Cable Detect” pin of a
VESA M1 compliant, dual-mode (analog and digital)
display. In this manner, the E-EDID appearing at address A0h on the DDC port will be either the analog or
digital E-EDID, depending on the state of the “Analog
Cable Detect” pin (pin C3 of the M1-DA connector). See
Figure 1.
Figure 1.
TO HOST
CONTROLLER
M1-DA CONNECTOR
Read and write operations can be performed on any
location within the memory space from the display DSP
interface regardless of the state of the EDID SEL pin or
the activity on the DDC interface. From the DDC
28
DDC +5V
47.5K
+5V DC
(SUPPLIED
BY DISPLAY)
10K
C3
1
8
7
27
DDC CLK
6
26
DDC DATA
5
E-EDID
EEPROM
2
I2C TO PROJECTOR/MONITOR
3
DISPLAY CONTROLLER
4
FUSE, RESISTOR
OR OTHER CURRENT
LIMITING DEVICE
REQUIRED IN ALL M1 DISPLAYS
8
RELAY CONTACTS SHOWN IN
DE-ENERGIZED POSITION
HPD
2A MAX
Table 1: DDC Interface
Table 2: DSP Interface
MEMORY ARRAY
Upper
Bank
Lower
Bank
01
Segment 1
256 Bytes
00
Segment 0
256 Bytes
01
Segment 1
256 Bytes
MEMORY ARRAY
00
00
Segment 0
256 Bytes
Segment Pointer
Address by
No Segment Pointer
Configuration Register
(see Figure 19)
00
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
11
Segment 3
256 Bytes
10
Segment 2
256 Bytes
01
Segment 1
256 Bytes
00
Segment 0
256 Bytes
00
Segment Pointer
No Segment Pointer
Doc No. 1044, Rev. F
CAT24C208
I2C Bus Protocol
Acknowledge
The following defines the features of the I2C bus protocol:
After a successful data transfer, each receiving device is
required to generate an acknowledge. The acknowledging
device pulls down the respective SDA line during the ninth
clock cycle, signaling that it received the 8 bits of data.
(1) Data transfer may be initiated only when the bus is
not busy.
(2) During a data transfer, the data line must remain
stable whenever the clock line is high. Any changes
in the data line while the clock line is high will be
interpreted as a START or STOP condition.
The CAT24C208 responds with an acknowledge after
receiving a START condition and its slave address. If the
device has been selected along with a write operation, it
responds with an acknowledge after receiving each 8-bit
byte.
START Condition
The START Condition precedes all commands to the
device, and is defined as a HIGH to LOW transition of
either SDA when the respective SCL is HIGH. The
CAT24C208 monitors the SDA and SCL lines and will
not respond until this condition is met.
When the CAT24C208 is in a READ mode it transmits 8
bits of data, releases the respective SDA line, and
monitors the line for an acknowledge. Once it receives
this acknowledge, the CAT24C208 will continue to
transmit data. If no acknowledge is sent by the Master,
the device terminates data transmission and waits for a
STOP condition.
STOP Condition
A LOW to HIGH transition of SDA when SCL is HIGH
determines the STOP condition. All operations must end
with a STOP condition.
After an unsuccessful data transfer an acknowledge will
not be issued (NACK) by the slave (CAT24C208), and
the master should abort the sequence. If continued the
device will read from or write to the wrong address in the
two instruction format with the segment pointers.
Figure 2. Acknowledge Timing
BUS RELEASE DELAY (TRANSMITTER)
SCL FROM
MASTER
1
8
BUS RELEASE DELAY (RECEIVER)
9
DATA OUTPUT
FROM TRANSMITTER
DATA OUTPUT
FROM RECEIVER
START
Doc. No. 1044, Rev. F
ACK SETUP
ACK DELAY
6
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT24C208
DEVICE ADDRESSING
DDC Interface
Both the DDC and DSP interfaces to the device are
based on the I2C bus serial interface. All memory space
operations are done at the A0/A1 DDC address pair. As
such, all write operations to the memory space are done
at DDC address A0h and all read operations of the
memory space are done at DDC address A1h.
is being read. Here the segment 00h can be at the lower
or upper bank depending on the configuration register.
Sequential reads can be done in much the same manner
by reading successive bytes after each acknowledge
without generating a stop condition. See Figure 4. The
device automatically increments the word offset value
(8-bit value) and with wraparound in the same segment
00h to read maximum of 256 bytes.
Figure 3 shows the bit sequence of a random read from
anywhere within the memory space. The word offset
determines which of the 256 bytes within segment 00h
Figure 3. Random Access Read (Segment 00h only)
WORD OFFSET
START
1010 0000
ACK
A7 - A0 ADDRESS
ACK
START
1010 0001
ACK
DATA
NOACK
STOP
Figure 4. Sequential Read (Segment 00h only)
WORD OFFSET
START
1010 0000
ACK
A7 - A0
ADDRESS
ACK
START
1010 0001
ACK
DATA0
ACK
.........
DATAN
NOACK
STOP
Figures 5 and 6 show the byte and page write respectively. The configuration register must have the WE bit set to 1
prior to any write on DDC Port. Only the segment 00h can be accessed of either lower or upper bank.
Figure 5. Byte Write (Segment 00h only)
WORD OFFSET
START
1010 0000
ACK
A7 - A0 ADDRESS
ACK
DATA
ACK
STOP
Figure 6. Page Write (Segment 00h only)
WORD OFFSET
START
1010 0000
ACK
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
A7 - A0 ADDRESS
ACK
7
DATA0
ACK
.........
DATA15
ACK
STOP
Doc No. 1044, Rev. F
CAT24C208
The segment pointer is at the address 60h and is writeonly. This means that a memory access at 61h will give
undefined results. The segment pointer is a volatile
register. The device configuration register at 62/63 (hex)
is a non-volatile register. The configuration register will
be shipped in the erased (set to FFh) state.
256 bytes within a segment. Note that if the segment
pointer is set to 00h then the device will behave like a
standard DDC2B EEPROM.
Read and write with segment pointer can expand the
addressable memory to 512 bytes in each bank with
wraparound to the next segment in the same bank only.
The two banks can be individually selected by the
configuration register and EDID Sel pin, as shown in
figure 19. The segments are selected by the two bits S1S0
= 00 or 01 in the segment address.
The segment pointer is used to expand the available
DDC address space while maintaining backward compatibility with older DDC interfaces such as DDC2B. For
each value of the 8-bit segment pointer one segment
(256 bytes) is available at the A0/A1 pair. The standard
DDC 8-bit address is sufficient to address each of the
Figures 7 to 10 show the random read, sequential read,
byte write and page write.
Figure 7. Random Access Read
START
0110 0000
ACK
xxxx xxS1S0 Segment ADDRESS
ACK
START
1010 0000
ACK
A7 - A0 ADDRESS
ACK
START
1010 0001
ACK
DATA
NOACK
STOP
Figure 8. Sequential Read
START
0110 0000
ACK
START
1010 0000
ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
START
1010 0001
ACK
DATA0
ACK
......
DATAN
NOACK
Figure 9. Byte Write
START
0110 0000
ACK
START
1010 0000
ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
DATA
ACK
STOP
Figure 10. Page Write
START
0110 0000
ACK
START
1010 0000
ACK
Doc. No. 1044, Rev. F
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
DATA0
8
ACK
..........
DATA15
ACK
STOP
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
STOP
CAT24C208
DSP Interface
The DSP interface is similar to I2C bus serial interface.
Without the segment pointer, the maximum accessible
memory space is 256 bytes of segment 00h only. In the
sequential mode the wrap around will be in the same
segment also. Figures 11 to 14 show the read and write
on the DSP Port.
Figure 11. Random Access Read
START
1010 0000
ACK
A7 - A0 ADDRESS
ACK
START
START
1010 0001
ACK
DATA
1010 0001
ACK
DATA
NOACK
STOP
Figure 12. Sequential Read
START
1010 0000
ACK
A7 - A0 ADDRESS
ACK
ACK
DATA0
ACK
.....
DATAN
NOACK
STOP
Figure 13. Byte Write
START
1010 0000
ACK
A7 - A0 ADDRESS
ACK
STOP
Figure 14. Page Write
START
1010 0000
ACK
A7 - A0 ADDRESS
ACK
DATA0
ACK
......
DATA15
ACK
STOP
selected by two bits S1S0 = 00, 01, 10, 11 in the segment
address. Figures 15 to 18 show the random read,
sequential read, byte write and page write.
The segment pointer is used to expand the available
DSP port addressable memory to 1k bytes, divided into
four segments of 256 bytes each. The four segments are
Figure 15. Random Access Read
START
0110 0000
ACK
START
1010 0000
ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
START
1010 0001
ACK
DATA
DATA0
ACK
NOACK
STOP
Figure 16. Sequential Read
START
0110 0000
ACK
START
1010 0000
ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
START
1010 0001
ACK
.......
DATAN
NOACK
STOP
Figure 17. Byte Write
START
0110 0000
ACK
START
1010 0000
ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
ACK
ACK
DATA
ACK
STOP
Figure 18. Page Write
START
0110 0000
ACK
START
1010 0000
ACK
xxxx xxS1S0 Segment ADDRESS
A7 - A0 ADDRESS
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
ACK
DATA0
9
ACK
ACK
......
DATA15
ACK
STOP
Doc No. 1044, Rev. F
CAT24C208
ARBITRATION
detected on either port, the opposite port SCL line is
pulled low, holding off activity on that port. When the
initiating SCL line has remained high for one full second,
the arbitration logic assumes that the initiating devices is
finished and releases the other SCL line. If the noninitiating device has been waiting for access, it can now
read or write the device.
The device performs a simplistic arbitration between the
DDC and DSP ports. While the arbitration scheme
described is not foolproof, it does prevent most errors.
Arbitration logic within the device monitors activity on
DDC_SCL and DSP_SCL. When both I2C ports are idle,
DDC_SCL and DSP_SCL are both high and the
arbitration logic is inactive. When a START condition is
CONFIGURATION REGISTER
MSB
LSB
Register Function
7
6
5
4
3
2
1
0
Configuration Register
X
X
X
X
WE
AB1
AB0
NB
Function Description:
NB:
Number of memory banks in DDC port memory map. 0 = 2 Banks, 1 = 1 Bank
AB0:
Active Bank Control Bit 0 (See Figure 19)
AB1:
Active Bank Control Bit 1 (See Figure 19)
WE DDC:
Write Enable 0 = Write Disabled, 1= Write Enabled
Note: WE affects only write operations from the DDC port, not the display port. The display port always has write access.
Figure 19. Configuration Register Truth Table
AB1
AB0
NB
EDID
Select Pin
Active Bank
0
X
0
0
Lower Bank
0
X
0
1
Upper Bank
1
0
0
X
Lower Bank
1
1
0
X
Upper Bank
X
X
1
X
Lower (only) Bank
The configuration register is a non-volatile register and
is available from either DSP or DDC port at address 62h/
63h for write and read resp.
Figure 20. Read Configuration Register
START
0110 0011
ACK
DATA
NO ACK
STOP
Figure 21. Write Configuration Register
START
0110 0010
Doc. No. 1044, Rev. F
ACK
DUMMY ADDRESS
ACK
XXXX WE AB1 AB0 NB
10
ACK
STOP
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
CAT24C208
PACKAGING INFORMATION
8-Lead 150 MIL SOIC (W)
E1
E
h x 45
D
C
A
θ1
e
A1
L
b
SYMBOL
MIN
A1
A
b
C
D
E
E1
e
h
L
θ1
0.10
1.35
0.33
0.19
4.80
5.80
3.80
NOM
MAX
0.25
1.75
0.51
0.25
5.00
6.20
4.00
1.27 BSC
0.25
0.40
0°
0.50
1.27
8°
8-LEAD_SOIC.eps
Notes:
1. All dimensions are in millimeters.
2. Complies with JEDEC specification MS-012.
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc No. 1044, Rev. F
CAT24C208
EXAMPLE OF ORDERING INFORMATION
Prefix
CAT
Company ID
Device #
24C208
Suffix
W
Product Number
24C208
I
–
G
Temperature Range
I = Industrial (-40°C to 85°C)
Package
W: SOIC
T3
Tape & Reel
T: Tape & Reel
3: 3000/Reel
Lead Finish
G: NiPdAu (PPF)
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard lead finish is NiPdAu.
(3) This device used in the above example is a CAT24C208WI-GT3 (SOIC, Industrial Temperature, NiPdAu, Tape & Reel)
(4) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office.
Doc. No. 1044, Rev. F
12
© 2006 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
REVISION HISTORY
Date
Rev.
Reason
2/18/2004
C
Changed volt operation to 3V to 5.5V
Updated Block Diagram
Updated Pin Descriptions
Updated DC Operating Characteristics
Updated AC Characteristics
Changed/Added figures 3 - 21
Updated Ordering Information
03/25/2005
D
Updated Function Description
Updated Ordering Information
06/22/06
E
Update Title
Update Features
Update Description
Updated DC Operating Characteristics
Updated AC Characteristics
Update Arbitration
Updated Example of Ordering Information
06/28/06
F
Update Features
Update Pin Configurations
Update Absolute Maximum Ratings
Update Reliability Characteristics
Update DC Operating Characteristics
Update Figure 2
Update Package Drawing
Update Example of Ordering Information
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typical semiconductor applications and may not be complete.
Catalyst Semiconductor, Inc.
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Publication #:
Revison:
Issue date:
1044
F
06/28/06