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M54977P Datasheet(PDF) 2 Page - Mitsubishi Electric Semiconductor

Part No. M54977P
Description  Bi-CMOS 12-BIT SERIAL-INPUT LATCHED DRIVER
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Maker  MITSUBISHI [Mitsubishi Electric Semiconductor]
Homepage  http://www.mitsubishichips.com
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M54977P Datasheet(HTML) 2 Page - Mitsubishi Electric Semiconductor

   
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Bi-CMOS 12-BIT SERIAL-INPUT LATCHED DRIVER
M54977P
MITSUBISHI <CONTROL / DRIVER IC>
Setting the LATCH input to “L” will prevent data from entering the
latch.
When the EN input is set to “H”, all outputs (O1 – O12) will be set
to OFF. Since the internal logic state of the IC is uncertain at
power-on time, set the EN input to “H” (and outputs O1 – O12 will
set to OFF) until the input data is set and the internal logic state
has been determined.
L-GND is the ground of the CMOS logic circuit section and P-GND
is the ground for the output driver section (O1 – O12), which is
made up of bipolar transistors that are capable of driving large
currents.
TIMING CHART
*The state of the shaded part is unstable.
S-IN
Serial input
T
Clock
LATCH
Latch input
EN
Enable input
S-OUT
Serial output
O1
O2
O3
O4
O5
O6
O7
O8
Parallel outputs
O9
O10
O11
O12


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