Datasheet

MAX7367/MAX7368/MAX7369
4-Channel I
2
C Switches/Multiplexer
______________________________________________________________________________________ 15
Serial Addressing
A master initiates communication with a slave device
by issuing a START condition followed by a slave
address byte. The slave address byte consists of 7
address bits and a read/write bit (R/W). When idle, the
MAX7367/MAX7368/MAX7369 continuously wait for a
START condition followed by its slave address. After
recognizing a start condition followed by the correct
address, the MAX7367/MAX7368/MAX7369 are ready
to accept or send data. The least significant bit (LSB) of
the address byte (R/W) determines whether the master
is writing to or reading from the MAX7367/MAX7368/
MAX7369 (R/W = 0 selects a write command, R/W = 1
selects a read command as shown in Figures 12 and
13). After receiving the proper address, the
MAX7367/MAX7368/MAX7369 (slave) issue an ACK by
pulling SDA low for one clock cycle.
Applications Information
Repeated Slave Addresses
The MAX7367/MAX7368/MAX7369 allow systems to
reuse slave addresses individually on each channel of
the extended bus. To reuse slave addresses on the
extended bus channels of the MAX7367/MAX7368,
ensure no more than one channel with a reused
address is selected at the same time.
Power-Supply Considerations
The MAX7367/MAX7368/MAX7369 operate from a
+2.3V to +5.5V power-supply voltage. Good power-
supply decoupling is needed to maintain the perfor-
mance of these parts. Bypass V
DD
to GND with a 0.1µF
surface-mount ceramic capacitor. Mount the bypass
capacitor as close as possible to the device.
1110
(A2)
A1 A0
INT3* INT2* INT1* INT0* B3**
B2 B1 B0
S A NA
START CONDITION STOP CONDITION
NOT ACKNOWLEDGE
BIT FROM MASTER
ACKNOWLEDGE BIT
FROM SLAVE
1
DEVICE ADDRESS CONTROL BYTE
() A2 = 0 FOR MAX7367.
** DON'T CARE FOR MAX7368.
** DON'T CARE FOR MAX7369.
P
Figure 12. Read Command
1110
(A2)
A1 A0
XXXX
B3*
B2 B1 B0
S A A
START CONDITION STOP CONDITIONACKNOWLEDGE BIT
FROM SLAVE
0
DEVICE ADDRESS CONTROL BYTE
P
ACKNOWLEDGE
BIT FROM SLAVE
() A2 = 0 FOR MAX7367.
* DON'T CARE FOR MAX7369.
X = DON'T CARE.
Figure 13. Write Command