BU8254KVT_13 Datasheet, PDF (14/21 Pages) Rohm – 35bit LVDS Transmitter

BU8254KVT
Technical Note
●System Timing Requirement
System Timing Requirement is mandatory by following two methods.
①The method of using CR circuit.( In the case that CLK does not stop after power supply)
②The method of using external specific IC. (In the case that CLK turns on/off after power supply)
It is recommend to do enough examination for target application.
①The method of using CR circuit.( In the case that CLK does not stop after power supply)
V ^DD
schottky barrier diode
V ^DD
10KΩ
PVDD
LVDD
Be careful of temperature of
the capacitor especially over
and again.
B characteristic ceramics and
polymer aluminum
are recommended.
220Ω _XRS
2.2µF ^T
VDD
td
Recommend
after VDD up
XRST
,
Recommend
after VDD up and before XRST release
CLK
,
If unused connect to GND
td is approximately equal to 20ms when the left RC coleus are applied.
Fig.10 The method of using CR circuit.
② The method of using external specific IC. (In the case that CLK turns on/off after power supply)
VDD
PVDD
VDD
external specific
IC
VOUT
VIN
XRST
CLK
GND
(CLK monitor and RST signal generation)
LVDD
VDD
XRST
CLK
Recommend
after VDD up
Recommend
after VDD up and before XRST release
Fig.11 The method of using external specific IC.
Recommend
after CLK input
Recommend
before XRST release
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14/17
2013.06 - Rev.C