Logic Level Translators for Cell Phones, Notebooks and Portables

Fairchild Semiconductor has introduced its FXL4T245BQX (4-bit bi-directional) and FXL5T244BQX (5-bit uni-directional) low-voltage logic-level translators in DQFN packaging. Designed for cell phones, notebooks and other battery-powered portable devices, CMOS-based FXL Series translators enable interconnection between a lower voltage microprocessor and higher voltage ASIC functions. The FXL4T245BQX and FXL5T244BQX provide level translation between the 2.5V to 3.3V I/Os of 3-, 4-, and 5-bit memory modules such as in Memory Stick® or Secure Digital (SD)™ card applications, and the frequently lower voltage I/Os of the processor chipset. Both translators feature configurable voltage supplies (VCCA and VCCB) for the inputs and outputs allowing translation in either direction, between typical logic levels of 1.2V, 1.5V, 1.8V, 2.5V and 3.3V. Power consumption is kept low by a quiescent current (ICC) specification of 20 µA max. Both devices are offered in the 14-terminal DQFN leadless package that measures 2.5 mm × 3.0 mm × 0.8 mm (h) and requires 30 percent of the board area of TSSOP. The DQFN package’s MSL-1 (moisture sensitivity level) rating eliminates the need for costly dry bag storage prior to use on the production line. Lead-free (Pb-free) FXL4T245BQX and FXL5T244BQX devices can withstand end user lead-free PC board attachment processes up to 250°C. All models in the series meet or exceed the requirements of the joint IPC/JEDEC standard J-STD-020B and are compliant with European Union requirements that will take effect in 2005. Other product features of the FXL series include a low noise buffered interface with up to 24mA drive; non-preferential power-up sequencing: either VCC may be powered-up first; the outputs switch to three-state if either VCCM is at GND; the device remains in three-state until both VCCs reach an active level; power-off overvoltage (IOFF) protection of I/Os and control pins; and minimum 4 kV HBM (Human Body Model) ESD protection; 8 kV HBM I/O-to-ground protection.



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