Onkyo PR-SC886 Service Manual page 111

QQ
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IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS -66
Q4700 : ICL3221ECVZ (RS-232 Transmitter/Receiver)
BLOCK DIAGRAM
TERMINAL DESCRIPTION
P N I
V System power supply input (3.0V to 5.5V).
CC
V+ Internally generated positive transmitter supply (+5.5V).
V- Internally generated negative transmitter supply (-5.5V).
GND Ground connection.
TE
L 13942296513
C1+ External capacitor (voltage doubler) is connected to this lead.
C1- External capacitor (voltage doubler) is connected to this lead.
C2+ External capacitor (voltage inverter) is connected to this lead.
C2- External capacitor (voltage inverter) is connected to this lead.
T TTL/CMOS compatible transmitter Inputs.
IN
T RS-232 level (nominally +/- 5.5V) transmitter outputs.
OUT
R RS-232 compatible receiver inputs.
IN
R TTL/CMOS level receiver outputs.
OUT
R TTL/CMOS level, noninverting, always enabled receiver outputs.
OUTB
INVALID Active low output that indicates if no valid RS-232 levels are present on any receiver input.
EN Active low receiver enable control; doesn't disable R
SHDN Active low input to shut down transmitters and on-board power supply, to place device in low power mode.
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (See Table 2).
FORCEON Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).
PIN CONFIGURATION
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+3.3V
+
0.1µF
2
C
C1+ V
1
CC
+
0.1 F
u
4
C1-
5
C
2 C2+
+
0.1 F u
6
C2-
T
11
T1
IN
9
R1
OUT
R
1
1
EN
12
FORCEON
GND
14
EN FORCEOFF
1 16
C1+ V
2 15
V+ GND
3 14
x ao u163
y
T1
C1- 13
4
FORCEON
C2+ 5 12
i
C2- T1
6 11
V- INVALID
7 10
R1 9 R1
8
IN
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2 9
8
15
+ C
3
3
V+
0.1uF
7
C
V-
4
u
+ 0.1 F
1
13
T1
OUT
8
R1
IN
5k
16
V
FORCEOFF CC
10 TO POWER
INVALID
CONTROL
LOGIC
F U N C I T O N
Q Q
3 6 7 1 3
outputs.
OUTB
CC
OUT
.
IN
OUT
TX-SR876/SA876
9 4 2 8
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9