Sharp PC-6220 Service Manual page 85

9·10. J..lPD4714GT (RS·232C DRIVER)
Block diagram/pin configuration (top view)
STBY Standby
TTUCMOS{
INPUT
17l--J>--H~I-~--122l ~:~~:}RS-232C
OUTPUT
1B1--I>+i~\-~-o--jl2il
DOUT3
AS-232C
AOUT2 RIN3 INPUT
~~~~~s
ROUT3 RIN4
ROUT4 RIN5
OUtput contrOl!
::u~~ [i09l-_~J-lc"'==-_!i9l
:::: )
ROUTS AeON
Threshold voltage
·VDD and VSS are the voltage output pins
that internally raised.
Fig. 9-14
Standby line is internally pulled down.
Voltage withstand of C1-C4 must be above 16V.
Truth table
STBY DeON
DIN Dour
Note
H
X X
Z Standby mode
L
L
X
L MARK level output
L H H L
MARK level output
L H L H
SPACE level output
control
H: High level L: Low level Z: High impedance X: H or L
STBY
RIN
H
X
L H
L L
-83-
-
P C-6220
ROUT
Z
L
H