Power Supply
The device operates from a single +5 Volt supply.
Separate pins for transmit and receive supplies
provide internal isolation. These pins should be
connected externally near the device and decou-
pled to their respective grounds. TV+ must not
exceed RV+ by more than 0.3V.
Decoupling and filtering of the power supplies is
crucial for the proper operation of the analog cir-
cuits in both the transmit and receive paths. A 1.0
μF capacitor should be connected between TV+
and TGND, and a 0.1 μF capacitor should be con-
nected between RV+ and RGND. Use mylar or
ceramic capacitors and place them as closely as
possible to their respective power supply pins. A
68 μF tantalum capacitor should be added close
to the RV+/RGND supply. Wire-wrap bread-
boarding of the line interface is not recommended
because lead resistance and inductance serve to
defeat the function of the decoupling capacitors.
Schematic & Layout Review Service
#ONFIRM/PTIMUM
3CHEMATIC,AYOUT
"EFORE"UILDING9OUR"OARD
&OR/UR&REE2EVIEW3ERVICE
#ALL!PPLICATIONS%NGINEERING
Call: (512) 445-7222
"ITS 3TATUS
2ESETHASOCCURREDORNOPROGRAMINPUT
4!/3INEFFECT
,,//0INEFFECT
4!/3,,//0INEFFECT
2,//0INEFFECT
$0-CHANGEDSTATESINCELASTCLEAR$0-
OCCURRED
,/3CHANGEDSTATESINCELASTCLEAR,/3
OCCURRED
,/3AND$0-HAVECHANGEDSTATESINCE
LASTCLEAR,/3ANDCLEAR$0-
Table 12. Coding for Serial Output bits 5,6,7
CS61574A CS61575
DS154F3 19
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&21),'(17,$/
