MAX4562 Maxim, MAX4562 Datasheet - Page 10

• Manufacturer Part Number: MAX4562
• Description: The MAX4562/MAX4563 serial-interface controlled switches are ideal for multimedia applications
• Manufacturer: Maxim

Serially Controlled, Clickless
Audio/Video Switches
The MAX4562/MAX4563 are serial-interface controlled
switches with soft-mode “clickless” and hard-mode oper-
ating capability. The MAX4562/MAX4563 contain two
SPST switches and two SPDT switches. The SPDT
switches are actually 2-to-1 multiplexers, in that each
SPDT is really two independent SPST switches with a
common node, as shown in the Pin Configuration . Each
switch is controlled independently by either the 2-wire
I
ible serial interface.
Audio off-isolation and crosstalk is -85dB at 20kHz.
Video off-isolation and crosstalk is at least -55dB at
10MHz.
Each switch of either device may be set to operate in
either soft or hard mode. In soft mode, the switching
Figure 3. 2-Wire Serial-Interface Timing Diagram
Figure 4. A Complete 2-Wire Serial-Interface Transmission
10
2
SDA
SCL
C-compatible or 3-wire SPI/QSPI/MICROWIRE-compat-
______________________________________________________________________________________
t
HD
START CONDITION
,
STA
20%
70%
20%
t
LOW
Detailed Description
70%
t
R
SDA
SCL
20%
70%
START CONDITION
t
SU
t
HIGH
,
DAT
70%
20%
t
F
70%
20%
MSB
SLAVE ADDRESS BYTE
t
HD
,
DAT
LSB
t
SU
REPEATED START CONDITION
,
ACK
STA
70%
MSB
transition is slowed to avoid the audible “clicking” that
can occur when switches are used to route audio sig-
nals. In hard mode, the switches are not slowed down,
making this mode useful when a faster response is
required. If a new command is issued while any soft-
mode switch is transitioning, the switch transition time is
decreased so it reaches its final state before the new
command is executed. Soft mode and open are the
power-up default states for all switches. Switches in the
same mode are guaranteed to be break-before-make
relative to each other. Break-before-make does not apply
between switches operating in different modes.
These devices operate from a +2.7V to +5.5V single
supply. The MAX4562 features a 2-wire I
serial interface, and the MAX4563 features a 3-wire
SPI/QSPI/MICROWIRE-compatible serial interface.
70%
20%
COMMAND BYTE
t
70%
HD
,
STA
LSB
ACK
STOP CONDITION
t
SU
,
STO
STOP CONDITION
70%
20%
70%
t
BUF
2
START CONDITION
C-compatible
70%
20%