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SX1512BIULTRT Datasheet(PDF) 9 Page - Semtech Corporation |
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SX1512BIULTRT Datasheet(HTML) 9 Page - Semtech Corporation |
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9 / 37 page 
ADVANCED COMMUNICATIONS & SENSING Rev 4 – 26 th April 2011 9 www.semtech.com SX1511B/SX1512B World’s Lowest Voltage Level Shifting GPIO with LED Driver and Keypad Engine Symbol Description Conditions Min Typ Max Unit tSO,VALID SO valid time (% of SCK cycle) After SCK falling edge - - 33 (4) % tNSS,SCK NSS low to SCK rising edge - 25 - - ns tSCK,NSS SCK falling edge to NSS high - 25 - - ns tNSS,HIGH NSS rising to falling edge - 25 - - ns Miscellaneous RPULL Programmable pull-up/down resistors for IO[0-7] - - 42 - k Internal 1.3 2 2.6 fOSC Oscillator frequency External from OSCIN (40-60% duty cycle) - - 2.6 MHz (1) Assuming no load connected to outputs and inputs fixed to VCC1,2 or GND. (2) Can be increased by tying together and driving simultaneously several I/Os. (3) With RegHighInput bit enabled (VCCx min =1.65V), else 3.6V (VCCx min = 1.2V) (4) fSCK is calculated assuming a tSO,VALID of maximum 1/3 of SCK cycle. This gives 1/6 of SCK cycle as setup time to the host controller. For systems where the setup time can be relaxed, tSO,VALID is also shown in §3 to allow the user to calculate the maximum SPI frequency for individual systems. Table 5 – Electrical Specifications |
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