Electronic Components Datasheet Search |
|
SIP5678 Datasheet(PDF) 10 Page - Vishay Siliconix |
|
SIP5678 Datasheet(HTML) 10 Page - Vishay Siliconix |
10 / 11 page SiP5678 Vishay Siliconix New Product www.vishay.com 10 Document Number: 73100 S-41843—Rev. A, 11-Oct-04 DETAILED OPERATION The SiP5678 is a multimode active terminator IC, which detects the operating mode of the SCSI bus, and switches to the appropriate termination configuration accordingly. Two SiP5678 terminators are required at each end of a wide SCSI bus to terminate 27 lines (18 data, 9 control). In LVD mode the SiP5678 provides 105-W differential impedance and 112-mV differential bias between each TN/TP pair of terminator lines. In S/E mode the SiP5678 provides 108-W impedance and 2.7-V pull-up on each TxN pin, and low impedance to ground on each TxP pin. In HPD mode the SiP5678 disconnects from the bus and presents high impedance to all TN/TP lines. Each SiP5678 IC has a 1.3-V DIFFSENS regulator output that can be used to drive the DIFFSENS line of a SCSI bus. The DIFFSENS regulator attempts to drive the DIFFSENS control signal to 1.3 V, but is current limited so that S/E or HPD devices on the SCSI bus can override the DIFFSENS regulator and put the bus into S/E or HPD mode of operation. The MODE pin senses the operational state of the SCSI bus by detecting the voltage on the DIFFSENS control line. There is an integrated 200-ms glich filter on the MODE input for reliable operation in a noisy environments. On power up, the SiP5678 initially defaults to a high impedance state on the termination pins. If the MODE pin detects S/E or LVD level on the DIFFSENS signal of the SCSI bus the SiP5678 will wait a standard delay (200 ms typical) before changing its operating mode. During regular operation if the MODE pin detects another bus mode change the SiP5678 again waits a standard delay before changing its operating mode. This mode change delay is implemented in accordance with SCSI standards SPI-3 and higher. The DISABLE pin is used to connect/disconnect the SiP5678. If it is pulled to GROUND the SiP5678 is in connect mode, and operates as a terminator. If it is pulled to TRMPWR or left open the device is in disconnect mode and presents high impedance to the SCSI bus. In disconnect mode the DIFFSENS regulator is disabled. The SiP5678 operates within SCSI specifications with the TERMPWR voltage between 2.7 V and 5.25 V, which enables it to operate in both 5-V and 3.3-V systems. The 2.7-V lower limit guarantees correct performance in a 3.3-V system. Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?73100. |
Similar Part No. - SIP5678 |
|
Similar Description - SIP5678 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |