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CAT24WC33PI-1.8TE13B 데이터시트(PDF) 4 Page - Catalyst Semiconductor |
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CAT24WC33PI-1.8TE13B 데이터시트(HTML) 4 Page - Catalyst Semiconductor |
4 / 12 page Discontinued Parts CAT24WC33/65 4 Doc. No. 1049, Rev. D © 2005 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice FUNCTIONAL DESCRIPTION The CAT24WC33/65 supports the I2C Bus data trans- mission protocol. This Inter-Integrated Circuit Bus proto- col defines any device that sends data to the bus to be a transmitter and any device receiving data to be a receiver. The transfer is controlled by the Master device which generates the serial clock and all START and STOP conditions for bus access. The CAT24WC33/65 operates as a Slave device. Both the Master device and Slave device can operate as either transmitter or re- ceiver, but the Master device controls which mode is activated. PIN DESCRIPTIONS SCL: Serial Clock The serial clock input clocks all data transferred into or out of the device. SDA: Serial Data/Address The bidirectional serial data/address pin is used to transfer all data into and out of the device. The SDA pin is an open drain output and can be wire-ORed with other open drain or open collector outputs. A0, A1, A2: Device Address Inputs These pins are hardwired or left unconnected (for hard- ware compatibility with CAT24WC16). When hardwired, up to eight CAT24WC33/65s may be addressed on a single bus system (refer to Device Addressing ). When the pins are left unconnected, the default values are zeros. WP: Write Protect This input, when tied to GND, allows write operations to the entire memory. For CAT24WC33/65 when this pin is tied to Vcc, the bottom 1/4 array of memory (locations 000H to 7FFH for the 24WC65 and locations 000H to 3FFH for 24WC33) is write protected . When left floating, memory is unprotected. 5020 FHD F05 Figure 3. Start/Stop Timing Figure 2. Write Cycle Timing Figure 1. Bus Timing START BIT SDA STOP BIT SCL 5020 FHD F04 tWR STOP CONDITION START CONDITION ADDRESS ACK 8TH BIT BYTE n SCL SDA 5020 FHD F03 tHIGH SCL SDA IN SDA OUT tLOW tF tLOW tR tBUF tSU:STO tSU:DAT tHD:DAT tHD:STA tSU:STA tAA tDH |
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