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CAT25C256SI-1.8TE13 데이터시트(PDF) 10 Page - Catalyst Semiconductor |
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CAT25C256SI-1.8TE13 데이터시트(HTML) 10 Page - Catalyst Semiconductor |
10 / 11 page 10 CAT25C128/256 Doc. No. 25088-00 1/01 Figure 9. HOLD HOLD HOLD HOLD HOLD Timing DESIGN CONSIDERATIONS to start an internal write cycle. Access to the array during an internal write cycle is ignored and programming is continued. On power up, SO is in a high impedance. If an invalid op code is received, no data will be shifted into the CAT25C128/256, and the serial output pin (SO) will remain in a high impedance state until the falling edge of CS is detected again. The CAT25C128/256 powers up in a write disable state and in a low power standby mode. A WREN instruction must be issued to perform any writes to the device after power up. Also,on power up CS should be brought low to enter a ready state and receive an instruction. After a successful byte/page write or status register write the CAT25C128/256 goes into a write disable mode. CS must be set high after the proper number of clock cycles CS SCK HOLD SO tCD tHD tHD tCD tLZ tHZ HIGH IMPEDANCE Note: Dashed Line= mode (1, 1) — — — — tCSH CS SCK WP WP tWPS tWPH Figure 10. WP WP WP WP WP Timing Note: Dashed Line= mode (1, 1) — — — — |
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