Features
 Clock speeds up to 10 MHz
 SIM card supply voltages range: from 1.65 V
to 3.6 V
 Host micro-controller operating voltage range:
from 1.08 V to 1.95 V
 Compliant with all ETSI, IMT-2000 and ISO-
7816-3 SIM/Smart card interface requirements
 Automatic level translation of I/O, RST and
CLK between SIM card and host side interface
with capacitance isolation
 Automatic enable and disable through VCCB
 No external resistors required with integrated
pull-up and pull-down resistors
 Integrated EMI filters suppress higher
harmonics of digital I/Os
 Level-shifting buffers keep ESD stress away
from the host
 ESD protection:
IEC61000-4-2 level 4, contact and air discharge
on all SIM card-side pins, VCCB, and GND are
±8 kV and ±15 kV respectively
 Packaged in QFN1.8*1.4-10
Descriptions
The DIO74557 is designed for interfacing a SIM
card with a low-voltage host-side interface (1.08 V
to 1.95 V). It contains three level shifters,
converting the I/O data, RST and CLK signals
between a SIM card and a host micro-controller.
The device is integrated with pull-up resistors,
which means no external resistors is required,
providing small overall solution size.
The DIO74557 is compliant with all ETSI, IMT-2000
and ISO-7816-3 SIM/Smart card interface
requirements.
The DIO74557 is housed in QFN1.8*1.4-10
package.
Applications
 Mobile and personal phones
 Wireless modems
 SIM card terminals