MAX9134GHJ+ Maxim Integrated Products, MAX9134GHJ+ Datasheet - Page 15

• Manufacturer Part Number: MAX9134GHJ+
• Description: IC SW LVDS CROSSBAR 32TQFP-EP
• Manufacturer: Maxim Integrated Products
• Type: LVDS Crossbar Switchr

Specifications of MAX9134GHJ+

• Applications: Digital Video
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 6. LIN Bus Wake-Up Signal
to the +3.3V logic level. Figure 5 shows the circuit that
interfaces the crossbar switches to the LIN bus.
At power-up, the MAX9132/MAX9134/MAX9135 leave
NSLP low, keeping the LIN bus driver in sleep mode.
When the LIN driver receives a wake-up signal (Figure
6) from the LIN bus, the driver pulls RXD low. When the
MAX9132/MAX9134/MAX9135 detect a falling edge on
RXD, the device pulls NSLP high waking up the LIN dri-
ver. The MAX9132/MAX9134/MAX9135 then enable the
TXD pin.
There are two conditions under which the MAX9132/
MAX9134/MAX9135 put the LIN driver to sleep: line
activity timeout and receiving a sleep command. The
first condition arises if there is inactivity on the LIN bus
X = Don’t care.
Table 6b. Switch Routing Control Pin Setting for the MAX9135
DOUT0
DOUT1
DOUT2
PORT
RXD
Putting the LIN Bus Driver into Sleep Mode
S5
X
X
0
0
0
1
1
______________________________________________________________________________________
S4
X
X
0
0
0
1
1
X
Waking Up the LIN Bus Driver
Input/Output LVDS Crossbar Switches
> 30µs
Programmable, High-Speed, Multiple
S3
X
X
X
X
0
0
0
1
1
Open
Open
S2
X
X
X
X
0
1
0
Open
Open
S1
X
X
0
1
0
X
Open
Open
S0
X
X
0
1
0
for more than 3s. The second condition requires send-
ing the data 0x00 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF
using the identifier 0x3C to the device. If any of the two
conditions happen, the device disables TXD and drives
NSLP low. This puts the LIN driver into sleep mode.
The MAX9132/MAX9134/MAX9135 high-impedance
outputs allow the attachment of several parts in parallel.
Figure 7 shows example connection schemes to realize
larger crossbar connections.
The MAX9132/MAX9134/MAX9135 feature a preem-
phasis mode where extra current is added to the output
and causes the amplitude to increase by 50% at the
transition point. Preemphasis helps to get a faster tran-
sition, better eye diagram, and improved signal integri-
ty (see the Typical Operating Characteristics ). During
data transition, the switch injects additional current for
a short period, typically 400ps. Leave PD open or apply
a midlevel voltage (V
all LVDS outputs. Set PD high to set preemphasis
through the I
mode is initially not on.
Set PD low to enable power-down mode. The registers
retain their values and the device resumes operation
from the same mode upon power-up.
Multiple MAX9132/MAX9134/MAX9135 for
DOUT0 connected to DIN0
DOUT0 connected to DIN1
DOUT0 connected to DIN2
DOUT0 connected to DIN3
DOUT1 connected to DIN0
DOUT1 connected to DIN1
DOUT1 connected to DIN2
DOUT1 connected to DIN3
DOUT2 connected to DIN0
DOUT2 connected to DIN1
DOUT2 connected to DIN2
DOUT2 connected to DIN3
DOUT0 in high impedance
DOUT1 in high impedance
DOUT2 in high impedance
CONNECTION
2
C or LIN interfaces. Preemphasis in this
LVDS Output Preemphasis
DD
/2) to enable preemphasis on
S5 and S0 determine
S4 and S1 determine
S3 and S2 determine
Port Expansion
DOUT0 connection
DOUT1 connection
DOUT2 connection
DESCRIPTION
Power-Down
15