CAT28WC129KA-TE13 datasheet(7/8 Pages) CATALYST

Part #	CAT28WC129KA-TE13

Description	128K-Bit I2C Serial CMOS E2PROM

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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Preliminary

CAT24WC129

7

Doc. No. 25065-00 6/99 S-1

Figure 8. Immediate Address Read Timing

24WC129 F10

SCL

SDA

8TH BIT

STOP

NO ACK

DATA OUT

89

SLAVE

ADDRESS

S

A

C

K

BUS ACTIVITY:

MASTER

SDA LINE

S

T

A

R

T

N

O

A

C

K

DATA

S

T

O

P

Figure 9. Selective Read Timing

24WC129 F11

*=Don't Care Bit

A15–A8

SLAVE

ADDRESS

S

A

C

K

A

C

K

A

C

K

BUS ACTIVITY:

MASTER

SDA LINE

S

T

A

R

T

A7–A0

BYTE ADDRESS

SLAVE

ADDRESS

S

A

C

K

N

O

A

C

K

S

T

A

R

T

DATA

P

S

T

O

P

*

data. The CAT24WC129 will continue to output an 8-bit

byte for each acknowledge sent by the Master. The

operation will terminate when the Master fails to respond

with an acknowledge, thus sending the STOP condition.

The data being transmitted from CAT24WC129 is out-

putted sequentially with data from address N followed by

data from address N+1. The READ operation address

counter increments all of the CAT24WC129 address bits

so that the entire memory array can be read during one

operation. If more than E (where E=16383) bytes are

read out, the counter will ‘wrap around’ and continue to

clock out data bytes.

‘dummy’ write operation by sending the START condi-

tion, slave address and byte addresses of the location it

wishes to read. After CAT24WC129 acknowledges, the

Master device sends the START condition and the slave

address again, this time with the R/

W bit set to one. The

CAT24WC129 then responds with its acknowledge and

sends the 8-bit byte requested. The master device does

not send an acknowledge but will generate a STOP

condition.

Sequential Read

The Sequential READ operation can be initiated by

either the Immediate Address READ or Selective READ

operations. After the CAT24WC129 sends the initial 8-

bit byte requested, the Master will respond with an

acknowledge which tells the device it requires more

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CAT28WC129KA-TE13 Datasheet(PDF) 7 Page - Catalyst Semiconductor

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