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CAT140029RWI-GT3 Fiches technique(PDF) 10 Page - Catalyst Semiconductor |
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CAT140029RWI-GT3 Fiches technique(HTML) 10 Page - Catalyst Semiconductor |
10 / 14 page CAT140xx © 2006 Catalyst Semiconductor, Inc. 10 Doc. No. 1117 Rev. A Characteristics subject to change without notice READ OPERATIONS Immediate Read Upon receiving a Slave address with the R/W bit set to ‘1’, the CAT140xx will interpret this as a request for data residing at the current byte address in memory. The CAT140xx will acknowledge the Slave address, will immediately shift out the data residing at the current address, and will then wait for the Master to respond. If the Master does not acknowledge the data (NoACK) and then follows up with a STOP condition (Figure 10), the CAT140xx returns to Standby mode. Selective Read Selective Read operations allow the Master device to select at random any memory location for a read operation. The Master device first performs a ‘dummy’ write operation by sending the START condition, slave address and byte address of the location it wishes to read. After the CAT140xx acknowledges the byte address, the Master device resends the START condition and the slave address, this time with the R/W bit set to one. The CAT140xx then responds with its acknowledge and sends the requested data byte. The Master device does not acknowledge the data (NoACK) but will generate a STOP condition (Figure 11). Sequential Read If during a Read session, the Master acknowledges the 1 st data byte, then the CAT140xx will continue transmitting data residing at subsequent locations until the Master responds with a NoACK, followed by a STOP (Figure 12). In contrast to Page Write, during Sequential Read the address count will automatically increment to and then wrap-around at end of memory (rather than end of page). POWER-ON RESET (POR) Each CAT140xx incorporates Power-On Reset (POR) circuitry which protects the internal logic against powering up in the wrong state. A CAT140xx device will power up into Standby mode after VCC exceeds the POR trigger level and will power down into Reset mode when VCC drops below the POR trigger level. This bi-directional POR feature protects the device against ‘brown-out’ failure follo– wing a temporary loss of power. Delivery State The CAT140xx is shipped erased, i.e., all bytes are FFh. |
Numéro de pièce similaire - CAT140029RWI-GT3 |
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Description similaire - CAT140029RWI-GT3 |
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