ICL3221 INTERSIL [Intersil Corporation], ICL3221 Datasheet - Page 4

• Manufacturer Part Number: ICL3221
• Description: 1 Microamp Supply-Current, +3V to +5.5V, 250kbps, RS-232 Transmitters/Receivers
• Manufacturer: INTERSIL [Intersil Corporation]

Pin Descriptions
Typical Operating Circuits
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2).
FORCEON
INVALID
R
SHDN
R
T
GND
V
C1+
C2+
OUTB
PIN
C1-
C2-
R
T
V+
OUT
EN
OUT
V-
CC
IN
IN
System power supply input (3.0V to 5.5V).
Internally generated positive transmitter supply (+5.5V).
Internally generated negative transmitter supply (-5.5V).
Ground connection.
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
TTL/CMOS compatible transmitter Inputs.
RS-232 level (nominally 5.5V) transmitter outputs.
RS-232 compatible receiver inputs.
TTL/CMOS level receiver outputs.
TTL/CMOS level, noninverting, always enabled receiver outputs.
Active low output that indicates if no valid RS-232 levels are present on any receiver input.
Active low receiver enable control; doesn’t disable R
Active low input to shut down transmitters and on-board power supply, to place device in low power mode.
Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).
LOGIC LEVELS
3-4
TTL/CMOS
+3.3V
R1
0.1 F
0.1 F
T1
OUT
C
C
IN
1
2
ICL3221 thru ICL3243
+
+
+
11
12
2
4
6
0.1 F
9
1
5
C1+
C1-
C2+
C2-
EN
FORCEON
OUTB
ICL3221
outputs.
GND
V
FUNCTION
R
CC
1
T
15
FORCEOFF
1
14
INVALID
5k
V+
V-
3
7
13
8
16
10
+ C
+ 0.1 F
0.1 F
C
T1
R1
V
TO POWER
CONTROL LOGIC
3
4
CC
OUT
IN
RS-232
LEVELS