SIM/Smart Card interface handles two channels

Designed for 2.5G and 3G cellular telephones, the LTC4557 from Linear Technology provides two complete interfaces for SIM (subscriber identity modules) and Smart Cards. The power-supply and level-translator IC provides both 1.8 and 3.3V power from a 3 to 6V input through its low dropout (LDO) linear regulator, and can deliver up to 50mA. Internal level translators allow controllers, which operate from a 1.2 to 4.4V supply, to interface with 1.8/3.3V ISM cards through this IC, as well. The 0.75mm high, 16-lead QFN IC measures 333mm, draws just 100½A quiescent current, and can withstand >10kV ESD on all pins. It is fully compatible with relevant specifications, such as ETSI, EMV, and ISO7816, and is $2.50 in 1000-piece orders.

by Bill Schweber

Linear Technology Corp
Fax 65-6754-4113
www.linear.com