24c02a-esn Microchip Technology Inc., 24c02a-esn Datasheet - Page 8

• Manufacturer Part Number: 24c02a-esn
• Description: 1k/2k/4k 5.0v Serial Eeproms
• Manufacturer: Microchip Technology Inc.

24C01A/02A/04A
FIGURE 9-3:
10.0
10.1
The levels on these inputs are compared with the cor-
responding bits in the slave address.
selected if the compare is true. For 24C04 A0 is no
function.
Up to eight 24C01A/02A's or up to four 24C04A's can
be connected to the bus.
These inputs must be connected to either V
10.2
This is a bidirectional pin used to transfer addresses
and data into and data out of the device. It is an open
drain terminal, therefore the SDA bus requires a pull-up
resistor to V
For normal data transfer, SDA is allowed to change only
during SCL LOW. Changes during SCL HIGH are
reserved for indicating the START and STOP condi-
tions.
10.3
This input is used to synchronize the data transfer from
and to the device.
10.4
This pin must be connected to either V
24C02A or 24C04A. It has no effect on 24C01A.
If tied to V
memory block will not be executed. Read operations
are possible.
If tied to V
(read/write the entire memory).
DS11183D-page 8
BUS ACTIVITY
MASTER
SDA LINE
BUS ACTIVITY
PIN DESCRIPTION
A0, A1, A2 Chip Address Inputs
SDA Serial Address/Data Input/Output
SCL Serial Clock
WP Write Protection
CC
SS
CC
, PROGRAM operations onto the upper
, normal memory operation is enabled
(typical 10K ).
SEQUENTIAL READ
CONTROL
BYTE
A
C
K
DATA n
CC
The chip is
SS
or V
or V
A
C
K
SS
CC
for
DATA n + 1
.
This feature allows the user to assign the upper half of
the memory as ROM which can be protected against
accidental programming. When write is disabled, slave
address and word address will be acknowledged but
data will not be acknowledged.
A
C
K
Note 1: A “page” is defined as the maximum num-
Note 2: A “block” is defined as a continuous area
DATA n + 2
ber of bytes that can be programmed in a
single write cycle. The 24C04A page is 8
bytes long; the 24C01A/02A page is 2
bytes long.
of memory with distinct boundaries. The
address pointer can not cross the bound-
ary from one block to another. It will how-
ever, wrap around from the end of a block
to the first location in the same block. The
24C04A has two blocks, 256 bytes each.
The 24C01A and 24C02A each have only
one block.
A
C
K
1996 Microchip Technology Inc.
DATA n + X
N
O
A
C
K
S
T
O
P
P