ISL4244EIR-T Intersil, ISL4244EIR-T Datasheet - Page 3

• Manufacturer Part Number: ISL4244EIR-T
• Description: IC 3DRVR/5RCVR RS232 3V 32-QFN
• Manufacturer: Intersil
• Type: Transceiverr

Specifications of ISL4244EIR-T

• Number Of Drivers/receivers: 3/5
• Protocol: RS232
• Voltage - Supply: 2.7 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Pin Descriptions
NOTE: ISL4238E input pins incorporate positive feedback resistors. Once the input is driven to a valid logic level, the feedback resistor maintains
that logic level until V
Pinouts
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
T1
T2
T3
T4
T5
R
T
GND
V
C1+
C2+
OUTB
PIN
C1-
C2-
R
T
NC
PD
V+
OUT
OUT
R1
R2
R3
V-
OUT
OUT
OUT
OUT
OUT
CC
IN
IN
IN
IN
IN
1
2
3
4
5
6
7
8
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. This is also the potential of the thermal pad (PD).
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. (Note)
±15kV ESD Protected
±15kV ESD Protected
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 input to override automatic power-down circuitry thereby keeping transmitters active. (FORCEOFF must be high).
No Connection
Exposed Thermal Pad. Connect to GND.
32
9
CC
10
31
is removed. Unused transmitter inputs may be left unconnected by the user.
11
30
(32 LD QFN)
TOP VIEW
ISL4238E
12
29
3
PD
13
,
,
28
RS-232 level (nominally ±5.5V) transmitter outputs.
RS-232 compatible receiver inputs.
14
27
15
26
ISL4238E, ISL4244E, ISL4245E
16
25
24
23
22
21
20
19
18
17
C1-
T1
T2
T3
R1
R2
T4
R3
IN
IN
IN
IN
OUT
OUT
OUT
FUNCTION
T1
T2
T3
R1
R2
R3
R4
R5
OUT
OUT
OUT
IN
IN
IN
IN
IN
1
2
3
4
5
6
7
8
32
9
10
31
ISL4244E, ISL4245E
11
30
(32 LD QFN)
TOP VIEW
12
29
PD
13
28
14
27
15
26
16
25
24
23
22
21
20
19
18
17
GND
FORCEON
FORCEOFF
INVALID
R2
R1
R2
C1-
May 13, 2010
OUTB
OUT
OUT
FN8038.5