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CAT24C256WI-GT3

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
CAT24C256
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10
READ OPERATIONS
Immediate Address Read
In standby mode, the CAT24C256 internal address
counter points to the data byte immediately following the
last byte accessed by a previous operation. If that ‘previous’
byte was the last byte in memory, then the address counter
will point to the 1st memory byte, etc.
When, following a START, the CAT24C256 is presented
with a Slave address containing a ‘1’ in the R/W bit position
(Figure 10), it will acknowledge (ACK) in the 9th clock cycle,
and will then transmit data being pointed at by the internal
address counter. The Master can stop further transmission by
issuing a NoACK, followed by a STOP condition.
Selective Read
The Read operation can also be started at an address
different from the one stored in the internal address counter.
The address counter can be initialized by performing a
‘dummy’ Write operation (Figure 11). Here the START is
followed by the Slave address (with the R/W bit set to ‘0’)
and the desired two byte address. Instead of following up
with data, the Master then issues a 2nd START, followed by
the ‘Immediate Address Read’ sequence, as described
earlier.
Sequential Read
If the Master acknowledges the 1st data byte transmitted
by the CAT24C256, then the device will continue
transmitting as long as each data byte is acknowledged by
the Master (Figure 12). If the end of memory is reached
during sequential Read, then the address counter will
‘wrap−around’ to the beginning of memory, etc. Sequential
Read works with either ‘Immediate Address Read’ or
‘Selective Read’, the only difference being the starting byte
address.
Figure 10. Immediate Address Read Timing
SCL
SDA 8th Bit
STOPNO ACKDATA OUT
89
SLAVE
ADDRESS
S
A
C
K
DATA
N
O
A
C
K
S
T
O
P
P
BUS ACTIVITY:
MASTER
SDA LINE
S
T
A
R
T
Figure 11. Selective Read Timing
SLAVE
ADDRESS
S
A
C
K
A
C
K
A
C
K
S
T
A
R
T
SLAVE
S
A
C
K
S
T
A
R
T
P
S
T
O
P
BYTE ADDRESS
ADDRESS
N
O
A
C
K
DATA
BUS ACTIVITY:
MASTER
SDA LINE
*
A
15
− A
8
A
7
− A
0
* = Don’t Care Bit
Figure 12. Sequential Read Timing
S
T
O
P
P
SLAVE
ADDRESS
A
C
K
N
O
A
C
K
DATA n
BUS ACTIVITY:
MASTER
SDA LINE
A
C
K
DATA n+1 DATA n+2
A
C
K
A
C
K
DATA n+x
CAT24C256
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11
ORDERING INFORMATION
Device Order Number
Device
Marking*
Package
Type
Temperature Range Lead Finish Shipping
†
CAT24C256WI−GT3 24256E SOIC−8, JEDEC I = Industrial
(−40°C to +85°C)
NiPdAu Tape & Reel,
3,000 Units / Reel
CAT24C256XI−T2 24256E SOIC−8, EIAJ I = Industrial
(−40°C to +85°C)
Matte−Tin Tape & Reel,
2,000 Units / Reel
CAT24C256YI−GT3 C56E TSSOP−8 I = Industrial
(−40°C to +85°C)
NiPdAu Tape & Reel,
3,000 Units / Reel
CAT24C256HU4IGT3 C8U UDFN−8 I = Industrial
(−40°C to +85°C)
NiPdAu Tape & Reel,
3,000 Units / Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
18.All packages are RoHS-compliant (Lead-free, Halogen-free).
19.The standard lead finish is NiPdAu.
20.For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
21.For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
22.For detailed information and a breakdown of device nomenclature and numbering systems, please see the ON Semiconductor Device
Nomenclature document, TND310/D, available at www.onsemi.com
ON Semiconductor is licensed by the Philips Corporation to carry the I
2
C bus protocol.
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks,
copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. SCILLC
reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any
particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without
limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications
and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC
does not convey any license under its patent rights nor the rights of others. SCILLC 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 SCILLC product could create a situation where
personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and
its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly,
any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture
of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5817−1050
CAT24C256/D
ON Semiconductor is licensed by Philips Corporation to carry the I
2
C Bus Protocol.
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: orderlit@onsemi.com
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
UDFN8, 2x3 EXTENDED PAD
CASE 517AZ
ISSUE A
DATE 23 MAR 201
5
SCALE 2:1
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.15 AND 0.25MM FROM THE TERMINAL TIP.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
A
D
E
B
C0.10
PIN ONE
REFERENCE
TOP VIEW
SIDE VIEW
BOTTOM VIEW
L
D2
E2
C
C0.10
C0.08
A1
SEATING
PLANE
NOTE 3
b
8X
0.10 C
0.05 C
A
B
DIM MIN MAX
MILLIMETERS
A 0.45 0.55
A1 0.00 0.05
b 0.20 0.30
D 2.00 BSC
D2 1.35 1.45
E 3.00 BSC
E2 1.25 1.35
e 0.50 BSC
L 0.25 0.35
1
4
8
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
0.50
PITCH
1.45
3.40
1
DIMENSIONS: MILLIMETERS
1
NOTE 4
0.30
8X
DETAIL A
A3 0.13 REF
A3
A
DETAIL B
L1
DETAIL A
L
ALTERNATE
CONSTRUCTIONS
L
L1 −−− 0.15
e
RECOMMENDED
5
1.56
GENERIC
MARKING DIAGRAM*
XXXXX = Specific Device Code
A = Assembly Location
WL = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
*This information is generic. Please refer to
device data sheet for actual part marking.
Pb−Free indicator, “G” or microdot “ G”,
may or may not be present.
XXXXX
AWLYWG
1
M
M
0.68
C0.10
8X
DETAIL B
MOLD CMPDEXPOSED Cu
ALTERNATE
CONSTRUCTIONS
A1
A3
MECHANICAL CASE OUTLINE
PACKAGE DIMENSIONS
http://onsemi.com
1
© Semiconductor Components Industries, LLC, 2002
October, 2002 − Rev. 0
Case Outline Number:
XXX
DOCUMENT NUMBER:
STATUS:
REFERENCE:
DESCRIPTION:
98AON42552E
ON SEMICONDUCTOR STANDARD
UDFN8, 2X3 EXTENDED PAD
Electronic versions are uncontrolled except when
accessed directly from the Document Repository. Printed
versions are uncontrolled except when stamped
“CONTROLLED COPY” in red.
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CAT24C256WI-GT3

Mfr. #:
Buy CAT24C256WI-GT3
Manufacturer:
ON Semiconductor
Description:
EEPROM 256kb I2C Serial CMOS EEPROM
Lifecycle:
New from this manufacturer.
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