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BU2505FV Folha de dados(PDF) 5 Page - Rohm |
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BU2505FV Folha de dados(HTML) 5 Page - Rohm |
5 / 22 page 5/18 BU2505FV BU2506FV TSZ02201-0RLR0GZ10140-1-2 © 2015 ROHM Co., Ltd. All rights reserved. 11.Dec.2015 Rev.001 www.rohm.co.jp TSZ22111・15・001 Timing Characteristics(Unless otherwise specified, VCC=5V, VrefH=5V, VrefL=0V, TA=25°C) Parameter Symbol Limits Unit Conditions Min Typ Max The voltage levels of the measured time points are 20% or 80% of VCC. Reset L pulse width tRTL 50 - - ns - Clock L pulse width tCKL 50 - - - Clock H pulse width tCKH 50 - - - Clock rise time tcr - - 50 - Clock fall time tcf - - 50 - Data setup time tDCH 20 - - - Data hold time tCHD 40 - - - Load setup time tCHL 50 - - - Load hold time tLDC 50 - - - Load H pulse width tLDH 50 - - - Data output delay time tDO - - 90 CL=100pF D/A output settling time tLDD - 7 20 μs CL≤100pF (Note 6), VO: 0.5V↔4.5V The time interval from the start time to change an output voltage to the time at which the output voltage reaches to its final value within 1/2 LSB. (Note 6) A capacitor should be placed between the analog output and ground in order to eliminate noise. A capacitance up to 100pF is recommended (including the capacitance of the wire). Applicational information LD input The LD input is a level trigger signal. When LD=H, an internal shift register value is loaded into a latch. It doesn’t have to be cared whether CLK is H or L when LD changes to H. However CLK must not be changed while LD is H. The shift register values pass through the latches if LD=H and CLK is toggled. Power-on operation The BU2505FV and the BU2506FV does not have a power-on reset function. Therefore, after power-on, data in the internal registers are unknown. When RESET changes from H to L, all latch outputs turn into L, although the shift registers are not reset. Pull-down resister Pin 5 and pin 6 are pulled up internally. If putting the external pull-down resister on them, the recommended value is less than 1kΩ. Truth Table L H Pin 5: RESET Reset Normal Pin 6: REVERSE MSB first LSB first CLK DI LD DA OUTPUT tCKL tcr tCKH tcf tDCH tCHD tCHL tLDH tLDC tLDD DO OUTPUT tDO RESET tRTL |
Nº de peça semelhante - BU2505FV |
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Descrição semelhante - BU2505FV |
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