ISL4270E

±15kV ESD Protected, +3V to +5.5V, 300nA, 250kbps, RS-232 Transceivers

Product Status: Mass Production

OVERVIEW

The ISL4270E is a 3.0V to 5.5V powered RS-232 transceiver that meets ElA/TIA-232 and V.28/V.24 specifications, even at VCC = 3.0V. It provides ±15kV ESD protection (IEC61000-4-2 Air Gap and Human Body Model) on transmitter outputs and receiver inputs (RS-232 pins). Targeted applications are notebook and laptop computers where the low operational power consumption and even lower standby power consumption is critical. Efficient on-chip charge-pumps coupled with manual and enhanced automatic powerdown functions reduce the standby supply current to a 300nA 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 ISL4270E features a VL pin that adjusts the logic pin output levels and input thresholds to values compatible with the VCC powering the external logic (for example, a UART).

This device includes an enhanced automatic powerdown function that powers down the on-chip power-supply and driver circuits. Automatic powerdown occurs when all receiver and transmitter inputs detect no signal transitions for a period of 30 seconds. The ISL4270E automatically powers back up whenever it senses a transition on any transmitter or receiver input.

Application Note AN9863 summarizes the features of each device comprising the 3V RS-232 family.

KEY FEATURES

    • Available in near chip scale QFN (5mmx5mm) package
    • VL supply pin for compatibility with mixed voltage systems
    • ESD protection for RS-232 I/O pins to ±15kV (IEC61000)
    • Manual and enhanced automatic powerdown features
    • Meets EIA/TIA-232 and V.28/V.24 specifications at 3V
    • On-chip charge pumps require only four external 0.1µF capacitors
    • Receivers stay active in powerdown
    • Very low supply current: 300µA
    • Guaranteed minimum data rate: 50kbps
    • Wide power supply range: single +3V to +5.5V
    • Low supply current in powerdown state: 300nA
    • Pb-free (RoHS compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL4270E
Basic Information
生产状态
Mass Production
Rx数量
3
Tx数量
3
高ESD保护
Yes
数据率
0.5 Mbps
供电电压Vcc (最小值) (V)
3
供电电压Vcc (最大值) (V)
5.5
手动关闭
Yes
自动关闭
Enhanced
Rx禁用
No
电容值
0.1 µF
IS启用 (mA)
0.3
IS禁用
0.3 µA
资质级别
Standard
供电电压Vcc范围 (V)
3 to 5.5
温度范围
-40 to +85

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