Five-function memory card interface
28 November 2007
Analogue, Mixed Signal, LSI
New from STMicroelectronics is a tiny, highly integrated chip which provides five essential functions required by memory card interfaces in a broad range of consumer and industrial products that use removable secure digital (SD) protocol cards. The new flip-chip EMIF06-SD02F3 memory-card transceiver integrates signal conditioning, bidirectional level shifting, ESD (electrostatic discharge) protection, EMI (electromagnetic interference) filtering and a 2,9 V voltage regulator.
The chip is compliant with standard and high-speed SD standards, and with MiniSD, MMC and uSD/TransFlash. It provides a high level of ESD protection to exposed external memory card slots, efficient EMI filtering to protect data lines against RF interference, and pull-up and pull-down resistors to prevent floating data lines. ESD protection on the card-side pins meets the stringent IEC61000-4-2 Level 4 standard, 15 kV air discharge. The 800 MHz to 3 GHz EMI filter achieves over 20 dB attenuation at 1 GHz.
In addition, six high-speed bidirectional level shifters, designed for 50 MHz operation and with 3 ns typical propagation delay, enable the interfacing of 2,9 V memory cards with 1,8 V host processors. A maximum channel-to-channel skew of 1,5 ns ensures data transmission integrity, and the drivers are optimised for low-power applications with quiescent off-current of 1 μA.
Power for the memory card is provided through an on-chip 2,9 V low drop-out (LDO) CMOS voltage regulator, with 200 mA current capability and an input voltage range of 3,1 V to 5 V. The drop-out voltage is 100 mV maximum with a 200 mA load. A switch-off control pin, with fast 30 μs turn-on time, helps minimise a product's power consumption and extend battery life, and the regulator includes thermal shut-down, under-voltage lock-out and short-circuit protection.
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