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2
FN6040.1
July 8, 2005
TABLE 1. SUMMARY OF FEATURES
PART NUMBER
NO. OF
Tx.
NO. OF
Rx.
DATA RATE
(kbps)
Rx. ENABLE
FUNCTION?
VL LOGIC
SUPPLY PIN?
MANUAL
POWER- DOWN?
ENHANCED AUTOMATIC
POWERDOWN FUNCTION?
ISL83387E
3
250
NO
YES
Pinout
ISL83387E (TSSOP)
TOP VIEW
C1+
V+
C1-
C2+
C2-
V-
T1IN
T2IN
INVALID
FORCEON
R3OUT
FORCEOFF
GND
T1OUT
T2OUT
T3OUT
R2IN
VL
R1OUT
R2OUT
VCC
R1IN
R3IN
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
T3IN
Pin Descriptions
PIN
FUNCTION
VCC
System power supply input (3.0V to 5.5V).
V+
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.
TIN
TTL/CMOS compatible transmitter Inputs. The switching point is a function of the VL voltage.
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. Swings between GND and VL.
VL
Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply.
INVALID
Active low output that indicates if no valid RS-232 levels are present on any receiver input. Swings between GND and VL.
FORCEOFF Active low to shut down transmitters and on-chip power supply. This overrides any automatic circuitry and FORCEON (see Table 2).
The switching point is a function of the VL voltage.
FORCEON Active high input to override automatic powerdown circuitry thereby keeping transmitters active. (FORCEOFF must be high). The
switching point is a function of the VL voltage.
ISL83387E