BU2050F_09 Datasheet, PDF (15/25 Pages) Rohm – Serial / Parallel 4-input Drivers

BU2050F,BU2092F,BU2092FV,BU2099FV,BD7851FP,BU2152FS
【BD7851FP】
●Pin descriptions
Pin No. Pin Name
1
2
3
4
5～15
16
17～21
22
23
24
25
GND
R_Iref
LATCH
S_IN
OUT16
～OUT6
P_GND
OUT5
～OUT1
SOUT
CLOCK
ENABLE
V_CC
Function
Ground
Reference Current Output Current setting
Latch Signal Input
Serial Data Input
Reference Current Output
Ground for Driver
Reference Current Output
Serial Data Output
Clock Input
ENABLE
V_CC
●Timing chart
CLOCK
Technical Note
S_IN
LATCH
DATA16
DATA15
DATA14
DATA2
DATA1
ENABLE
OUTn
Previous DATA
DATA
SOUT
Previous
DATA15
Previous
DATA14
Previous
DATA2
Previous
DATA1
DATA16
DATA15
DATA14
Fig. 12
1. After the power is turned on and the voltage is stabilized, LATCH should be activated, after clocking 16 data bits
into the S_IN terminal.
2. OUTn parallel output data of the shift register is set after the 16^th clock by the LATCH.
3. The final stage data of the shift register is outputted to the SOUT by synchronizing with the rise time of the
CLOCK.
4. Since the LATCH is a label latch, data is retained in the “L” section and renewed in the “H” section of the LATCH.
5. Data retained in the internal latch circuit is outputted when the ENABLE is in the “L” section. When the ENABLE
is in the “H” section, data is fixed in the “H” section.
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2009.06 - Rev.A