ISL3232E_14 Datasheet, PDF (3/14 Pages) Intersil Corporation – QFN Packaged, ±15kV ESD Protected,+2.7V to +5.5V, 150nA, 250kbps, RS-232 Transmitters/Receivers

ISL3232E, ISL4221E, ISL4223E
Pin Descriptions
PIN
FUNCTION
VCC System power supply input (2.7V to 5.5V).
V+
Internally generated positive transmitter supply (+5.5V).
V-
Internally generated negative transmitter supply (-5.5V).
GND Ground connection. This is also the potential of the thermal pad (PD)
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.
TIN
TTL/CMOS compatible transmitter Inputs.
TOUT ±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs.
RIN
±15kV ESD Protected, RS-232 compatible receiver inputs.
ROUT TTL/CMOS level receiver outputs.
INVALID Active low output that indicates if no valid RS-232 levels are present on any receiver input.
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 power-down circuitry thereby keeping transmitters active. (FORCEOFF must be high).
EN
Active low receiver enable control.
PD
Exposed Thermal Pad. Connect to GND.
Typical Operating Circuits
+3.3V
+ _0.1µF
C₁
0.1µF
C₂
0.1µF
15
+ ^C1+
1
C1-
2
+
C2+
3
C2-
9
T1_IN
TTL/CMOS
LOGIC LEVELS
8
T2_IN
10
R1_OUT
7
R2_OUT
ISL3232E
14
V_CC
T₁
T₂
R₁
R₂
16
V+
+
C₃
0.1µF
V- ⁴
12
C₄
+0.1^µF
T1_OUT
5
T2_OUT
11
5kΩ
6
5kΩ
R1_IN
R2_IN
RS-232
LEVELS
GND
13
3
FN6045.6
May 13, 2010