ISL4221E Intersil Corporation, ISL4221E Datasheet - Page 2

• Manufacturer Part Number: ISL4221E
• Description: QFN Packaged, +/-15kV Esd Protected, +2.7V to +5.5V, 150Nanoamp, 250kBps, RS-232 Transmitters/receivers
• Manufacturer: Intersil Corporation

Pinouts
Pin Descriptions
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
T
GND
V
C1+
C2+
PIN
C1-
C2-
T
R
EN
V+
OUT
OUT
V-
CC
IN
IN
C2+
C1-
C2-
V+
System power supply input (2.7V 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.
±15kV ESD Protected
±15kV ESD Protected
TTL/CMOS level receiver outputs.
Active low output that indicates if no valid RS-232 levels are present on any receiver input.
Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high).
Active low receiver enable control.
1
2
3
4
16
5
ISL4221E (QFN)
TOP VIEW
15
6
2
14
7
,
,
RS-232 level (nominally ±5.5V) transmitter outputs.
RS-232 compatible receiver inputs.
13
8
12
11
10
9
GND
T1
FORCEON
T1
OUT
IN
ISL4221E, ISL4223E
FUNCTION
C2+
C1-
C2-
V+
V-
1
2
3
4
5
20
6
ISL4223E (QFN)
19
7
TOP VIEW
18
8
17
9
10
16
15
14
13
12
11
T1
R1
R1
FORCEON
T1
OUT
IN
IN
OUT