ICL3245 Intersil Corporation, ICL3245 Datasheet - Page 3

• Manufacturer Part Number: ICL3245
• Description: 1ma, +3v To +5.5v, 1mbps, Rs-232 Transceivers With Enhanced Automatic Powerdown
• Manufacturer: 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
READY
R
R
T
GND
V
C1+
C2+
PIN
OUTB
C1-
C2-
T
R
V+
OUT
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 high output that indicates when the ICL32XXE is ready to transmit (i.e., V- ≤ -4V)
Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).
LOGIC LEVELS
3
TTL/CMOS
+3.3V
0.1µF
0.1µF
R1
R2
C
C
T1
T2
OUT
OUT
1
2
IN
IN
+
ICL3225, ICL3245
13
12
15
10
+
+
14
2
4
5
6
1
0.1µF
C1+
C1-
C2+
C2-
FORCEON
READY
ICL3225
GND
FUNCTION
V
R
R
CC
2
T
T
1
19
FORCEOFF
18
1
2
INVALID
5kΩ
5kΩ
V+
V-
3
7
17
8
16
9
20
11
+ C
TO POWER
CONTROL LOGIC
+
0.1µF
C
0.1µF
T1
T2
R1
R2
V
3
4
CC
OUT
OUT
IN
IN
RS-232
LEVELS
February 27, 2006
FN4878.8