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ISL4244EIR Datasheet(PDF) 3 Page - Intersil Corporation |
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ISL4244EIR Datasheet(HTML) 3 Page - Intersil Corporation |
3 / 17 page 3 FN8038.5 May 13, 2010 Pinouts ISL4238E (32 LD QFN) TOP VIEW ISL4244E, ISL4245E (32 LD QFN) TOP VIEW 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. (Note) 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. ROUTB TTL/CMOS level, noninverting, always enabled 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). 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 VCC is removed. Unused transmitter inputs may be left unconnected by the user. T1OUT T2OUT T3OUT R1IN R2IN T4OUT R3IN T1IN T2IN T3IN R1OUT R2OUT T4IN R3OUT T5OUT C1- 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 32 31 30 29 28 27 26 25 9 1011 12 13 1415 16 PD R1IN R2IN R3IN R4IN R5IN T1OUT T2OUT C1- FORCEON FORCEOFF INVALID R2OUTB R1OUT R2OUT T3OUT GND 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 32 31 30 29 28 27 26 25 9 1011 12 13 1415 16 PD ISL4238E, ISL4244E, ISL4245E |
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