ICL3225 Datasheet, PDF (3/18 Pages) Intersil Corporation – 1 Microamp, +3V to +5.5V, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown

ICL3225, ICL3245
Pin Descriptions
PIN
FUNCTION
V_CC
V+
System power supply input (3.0V to 5.5V).
Internally generated positive transmitter supply (+5.5V).
V-
Internally generated negative 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.
T_IN
T_OUT
R_IN
R_OUT
R_OUTB
INVALID
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.
READY Active high output that indicates when the ICL32XXE is ready to transmit (i.e., V- ≤ -4V)
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).
Typical Operating Circuits
ICL3225
+3.3V
+ _0.1µF
C₁
0.1µF
C₂
0.1µF
2
+ ^C1+
4
C1-
5
+
C2+
6
C2-
13
T1_IN
TTL/CMOS
LOGIC LEVELS
12
T2_IN
15
R1_OUT
19
V_CC
T₁
T₂
R₁
3
V+
+ ^C3
0.1µF
V- ⁷
17
C₄
+0.1^µF
T1_OUT
8
16
5kΩ
T2_OUT
R1_IN
RS-232
LEVELS
10
R2_OUT
9
R2_IN
R₂
5kΩ
1
READY
20
FORCEOFF
14
FORCEON
11
INVALID
GND
18
V_CC
TO POWER
CONTROL LOGIC
3