lmh0356sq National Semiconductor Corporation, lmh0356sq Datasheet - Page 11

• Manufacturer Part Number: lmh0356sq
• Description: 3 Gbps Hd/sd Sdi Reclocker With 4 1 Input Mux And Fr4 Eqs
• Manufacturer: National Semiconductor Corporation

LOCK DETECT
SERIAL DATA INPUT SELECTOR
The Serial Data Input Selector (SEL [1:0]) allows the user to
select the active input channel.
lected for a given state of SEL [1:0]. The SEL pins have
internal pull-downs.
LOCK DETECT
The Lock Detect (LD) output, when high, indicates that data
is being received and the PLL is locked. LD may be connected
to the OUTPUT MUTE input to mute the data and clock out-
puts when no data signal is being received. Note than when
the Bypass/Auto Bypass input is set high, Lock Detect will
remain low. See
X
0
1
0
1
SEL [1:0] Code
TABLE 2. Data Input Select Codes
00
01
10
11
Table
OUTPUT MUTE
LOCK DETECT
LOCK DETECT
3.
1
1
0
Table 2
BYPASS/AUTO BYPASS
Selected Input
shows the input se-
SDI0
SDI1
SDI2
SDI3
TABLE 3. Control Functionality
X
X
X
0
0
11
PLL unlocked, reclocker bypassed
PLL locked to supported data rate, reclocker not bypassed
Outputs muted
Outputs muted
PLL locked to supported data rate, reclocker not bypassed
OUTPUT MUTE
The OUTPUT MUTE input, when low, mutes the serial data
and clock outputs. It may be connected to Lock Detect or ex-
ternally driven to mute or un-mute the outputs. If OUTPUT
MUTE is connected to LD, then the data and clock outputs
are muted when the PLL is not locked. This function overrides
the Bypass function: see
internal pull-up device to enable the output by default.
BYPASS/AUTO BYPASS
The Bypass/Auto Bypass input, when high, forces the device
to output the data without reclocking it. When this input is low,
the device automatically bypasses the reclocking function
when the device is in an unlocked condition or the detected
data rate is a rate which the device does not support. Note
than when the Bypass/Auto Bypass input is set high, Lock
Detect will remain low. See
PASS has an internal pull-down device.
DEVICE STATUS
Table
Table
3. OUTPUT MUTE has an
3. BYPASS/AUTO BY-
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