Transmitters/Receivers - Renesas
Description
Datasheet
ISL3232E, ISL4221E, ISL4223E
QFN Packaged, ±15kV ESD Protected, +2.
7V to +5.
5V, 150nA, 250kbps, RS-232 Transmitters/Receivers
The ISL3232E, ISL4221E, and ISL4223E devices are 2.
7V to 5.
5V powered RS-232 transmitters/receivers that meet ElA/TIA-232 and V.
28/V.
24 specifications, even at VCC = 3.
0V.
They provide ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins).
Targeted applications are PDAs, Palmtops, and hand-held products where the low operational power consumption and even lower standby power consumption are critical.
Efficient on-chip charge pumps, coupled with manual and automatic powerdown functions, reduce the standby supply current to a 150nA trickle.
The 5mmx5mm Quad Flat No-Lead (QFN) packaging and the use of small, low value capacitors ensure board space savings.
Data rates greater than 250kbps are ensured at worst case load conditions.
The ISL4221E is a 1 driver, 1 receiver device and the ISL3232E and ISL4223E are 2 driver, 2 receiver devices that, coupled with the 5mmx5mm QFN package, provide the industry’s smallest, lowest power serial port suitable for PDAs, and hand-held applications.
The 5mmx5mm QFN requires 40% less board area than a 20 Ld TSSOP, and is nearly 20% thinner.
The ISL4221E and ISL4223E versions feature an automatic powerdown function that powers down the on-chip power supply and driver circuits.
Automatic powerdown occurs when an attached peripheral device is shut off or the RS-232 cable is removed, and conserves system power automatically without changes to the hardware or operating system.
The ISL4221E and ISL4223E power back up automatically when a valid RS-232 voltage is applied to any receiver input.
Table 1 summarizes the features of the IC’s and AN9863 summarizes the features of each device comprising the 3V RS-232 family.
Features
• Available in near chip scale QFN (5mmx5mm) package, which is 40% smaller than a 20 Ld TSSOP
• ESD protection for R...
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