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CAT25C33LSETE13 데이터시트(PDF) 4 Page - Catalyst Semiconductor |
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CAT25C33LSETE13 데이터시트(HTML) 4 Page - Catalyst Semiconductor |
4 / 11 page Discontinued Parts 4 CAT25C33/65 Doc. No. 1000, Rev. H © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice FUNCTIONAL DESCRIPTION The CAT25C33/65 supports the SPI bus data transmission protocol. The synchronous Serial Peripheral Interface (SPI) helps the CAT25C33/65 to interface directly with many of today’s popular microcontrollers. The CAT25C33/65 contains an 8-bit instruction register. (The instruction set and the operation codes are detailed in the instruction set table) After the device is selected with CS going low, the first byte will be received. The part is accessed via the SI pin, with data being clocked in on the rising edge of SCK. The first byte contains one of the six op-codes that define the operation to be performed. PIN DESCRIPTION SI: Serial Input SI is the serial data input pin. This pin is used to input all opcodes, byte addresses, and data to be written to the 25C33/65. Input data is latched on the rising edge of the serial clock. SO: Serial Output SO is the serial data output pin. This pin is used to transfer data out of the 25C33/65. During a read cycle, data is shifted out on the falling edge of the serial clock. Instruction Opcode Operation WREN 0000 0110 Enable Write Operations WRDI 0000 0100 Disable Write Operations RDSR 0000 0101 Read Status Register WRSR 0000 0001 Write Status Register READ 0000 0011 Read Data from Memory WRITE 0000 0010 Write Data to Memory INSTRUCTION SET Figure 1. Sychronous Data Timing Note: Dashed Line= mode (1, 1) — ——— VALID IN VIH VIL tCSS VIH VIL VIH VIL VOH VOL HI-Z tSU tH tWH tWL tV tCS tCSH tHO tDIS HI-Z CS SCK SI SO tRI tFI Note: (1) X=0 for 25010, 25020. X=A8 for 25040 (2) This parameter is tested initially and after a design or process change that affects the parameter. (3) tPUR and tPUW are the delays required from the time VCC is stable until the specified operation can be initiated. Power-Up Timing(2)(3) Symbol Parameter Max. Units tPUR Power-up to Read Operation 1 ms tPUW Power-up to Write Operation 1 ms |
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