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Product Detailed Parameters
- Description：SIM Card Interface Level Shifter
- Series：-
- Mfr：Dioo Microcircuits Co., Ltd.
- Package：Tape & Reel (TR)
- Translator Type：Voltage Level
- Channel Type：Bidirectional
- Number of Circuits：1
- Channels per Circuit：1
- Input Signal：-
- Output Signal：-
- Output Type：Open Drain
- Data Rate：-
- Operating Temperature：-40°C ~ 85°C (TA)
- Features：-
- Mounting Type：Surface Mount
- Package / Case：10-UFQFN
- Supplier Device Package：10-QFN (1.8x1.4)
- Voltage - VCCA：1.08 V ~ 1.95 V
- Voltage - VCCB：1.65 V ~ 3.6 V
- Grade：-
- Qualification：-
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Overview
The DIO74557LP10 is a SIM card interface level shifter manufactured by Dioo Microcircuits in a QFN1.8*1.4-10 package. It supports host supply voltages (VCCA) from 1.08 V to 1.95 V and SIM supply voltages (VCCB) from 1.65 V to 3.6 V. The device provides automatic level translation for I/O, RST, and CLK signals with clock speeds up to 10 MHz. Operating temperature range is -40°C to +85°C.
Feature Summary
- Automatic enable and disable functionality controlled by the VCCB voltage threshold.
- Integrated EMI filters suppress higher harmonics of digital I/Os.
- Internal pull-up and pull-down resistors eliminate the need for external components.
- ESD protection on all SIM card-side pins, VCCB, and GND.
Applications
- Mobile and personal phones
- Wireless modems
- SIM card terminals
Procurement Notes
Verify the specific ordering part number DIO74557LP10 against the manufacturer's official documentation to ensure correct package type and revision. Confirm that the QFN1.8*1.4-10 footprint matches your PCB layout requirements. Ensure compatibility with the required operating voltage ranges and environmental specifications before finalizing procurement.
Selection Notes
Select this component when interfacing low-voltage host microcontrollers (1.08 V to 1.95 V) with standard SIM cards (1.65 V to 3.6 V). It is suitable for designs requiring integrated EMI filtering and ESD protection without additional external resistors. Consider the QFN1.8*1.4-10 package size constraints and the availability of the EN pin for shutdown control.
Part Context
The DIO74557 series includes variants such as DIO74557WL9 in a WLCSP-9 package. This specific LP10 suffix denotes the QFN1.8*1.4-10 package configuration. The device is part of Dioo Microcircuits' specialized interface IC portfolio designed for mobile communication applications.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided documentation.
FAQ
How does the device handle the shutdown sequence?
When the EN pin is pulled LOW, the RST_SIM channel powers down first, triggering the sequential power down of CLK_SIM and IO_SIM channels. The SIM pins are pulled LOW by internal pull-down resistors within a few microseconds.
What is the function of the EN pin?
The EN pin is an enable pin present only in the QFN1.8*1.4-10 package. It should be HIGH (VCCA) for normal operation and LOW to initiate the shutdown sequence or avoid race conditions during power-off.
