Integra DTR-5.9 Service Manual page 83

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS-46
Q6311 : ICL3221ECVZ (RS-232 Transmitters / Receivers)
BLOCK DIAGRAM
TERMINAL DESCRIPTION
Pin Name Description
VCC System power supply input (3.0V to 5.5V).
V+ Internally generated positive transmitter supply (+5.5V).
V- Internally generated positive transmitter supply (-5.5V).
GND Ground connection.
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.
T1IN TTL/CMOS compatible transmitter Inputs.
T1OUT ±15kV ESD Protected, RS-232 level (nominally +5.5V) transmitter outputs.
R1IN ±15kV ESD Protected, RS-232 compatible receiver inputs.
R1OUT TTL/CMOS level receiver outputs.
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 ROUTB outputs.
FORCEOFF Active low to shut down transmitters and on-chip power supply.
This overrides any automatic circuitry and FORCEON.
FORCEON Active high input to override automatic powerdown circuitry thereby keeping transmitters active.
TOP VIEW
EN 1
C1+ 2
V+ 3
C1- 4
C2+ 5
C2- 6
V- 7
R1
R1IN 8
16 FORCEOFF
15 VCC
14 GND
13 T1OUT
12 FORCEON
11 T1IN
10 INVALID
9 R1OUT
DTR-5.9