ISL4238E Datasheet, PDF (3/17 Pages) Intersil Corporation – QFN Packaged, ±15kV ESD Protected, +2.7V to +5.5V, 10Nanoamp, 250kbps/1Mbps, RS-232 Transceivers with Enhanced Automatic Power-down

Pinouts
ISL4238E, ISL4244E, ISL4245E
ISL4238E
(32 LD QFN)
TOP VIEW
ISL4244E, ISL4245E
(32 LD QFN)
TOP VIEW
32 31 30 29 28 27 26 25
T1_{OUT 1}
T2_OUT 2
24 ^C1-
23 ^T1IN
T3_OUT 3
22 ^T2IN
R1_IN 4
21 ^T3IN
PD
R2_IN 5
20 ^R1OUT
T4_OUT 6
19 ^R2OUT
R3_IN 7
18 T4_IN
T5_OUT 8
17 R3_OUT
9 10 11 12 13 14 15 16
32 31 30 29 28 27 26 25
R1_IN 1
24 GND
R2_IN 2
23 ^C1-
R3_IN 3
22 ^FORCEON
R4_IN 4
R5_IN 5
T1_OUT 6
21 ^FORCEOFF
PD
20 ^INVALID
19 ^R2OUTB
T2_OUT 7
18 ^R1OUT
T3_OUT 8
17 R2_OUT
9 10 11 12 13 14 15 16
Pin Descriptions
PIN
FUNCTION
V_CC
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.
T_IN
T_OUT
R_IN
R_OUT
R_OUTB
INVALID
TTL/CMOS compatible transmitter Inputs. (Note)
±15kV ESD Protected, RS-232 level (nominally ±5.5V) transmitter outputs.
±15kV ESD Protected, 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.
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).
NC
No Connection
PD
Exposed Thermal Pad. Connect to GND.
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_CC is removed. Unused transmitter inputs may be left unconnected by the user.
3
FN8038.5
May 13, 2010