W83178S Winbond Electronics, W83178S Datasheet
W83178S
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W83178S Summary of contents
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... GENERAL DESCRIPTION The W83178S outputs SDRAM clock buffer for 3-DIMMs models incorporate with W83196S- 14 which is the clock synthesizer especially for the 100 MHz models such as Intel BX chipsets. (Refer the datasheet fo Winbond W83196S-14) The W83178S receives the clock from chipset by the Buffer_In pin and provides almost zero-delay (less than 4 nS propagation delay) SDRAM buffer outputs for the 13 SDRAM clocks which are synchronous with the CPU clock outputs priovided by W83196S-14 ...
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... SDRAM clock outputs which have the same frequency as CPU clocks. 14 I/O Serial data Serial clock Clock Input from the chipset - Power supply - Circuit ground - 2 - Preliminary W83178S SDRAM0 SDRAM1 SDRAM2 SDRAM3 SDRAM4 SDRAM5 SDRAM6 SDRAM7 SDRAM8 SDRAM9 SDRAM10 SDRAM11 SDRAM12 FUNCTION 2 C 2-wire control interface ...
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... All proceeding bytes must be sent to change one of the control bytes. The 2-wire control interface allows each clock output individually enabled or disabled. On power up, the W83178S initializes with default register settings, and then it ’o ptional to use the 2-wire control interface. The SDATA signal only changes when the SDCLK signal is low, and is stable when SDCLK is high during normal data transfer ...
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... Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device. 27 SDRAM11 (Active/Inactive) 28 SDRAM10 (Active/Inactive) 23 SDRAM9 (Active/Inactive) 22 SDRAM8 (Active/Inactive) - Reserved - Reserved 19 SDRAM7 (Active/Inactive) 18 SDRAM6 (Active/Inactive) - Reserved 12 SDRAM12 (Active/Inactive) - Reserved - Reserved - Reserved - Reserved - Reserved - Reserved SYMBOL STG Preliminary W83178S DESCRIPTION DESCRIPTION ). DD RATING -0.5V to +7.0V - +150 C - +125 +70 C ...
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... T 1.0 <4 1.0 <4 SYM. MIN. TYP. MAX. V Vss - 100 160 110 185 OUT Preliminary W83178S UNITS TEST CONDITIONS MHz V/nS Measured from 0.4V to 2.4V V/nS Measured from 0. Measure at 1.5V UNITS TEST CONDITIONS Publication Release Date: March 1999 ...
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... W83178S 9. HOW TO READ THE TOP MARKING W83178S 28051234 814GBB 1st line: Winbond logo and the type number: W83178S 2nd line: Tracking code 2 8051234 2: wafers manufactured in Winbond FAB 2 8051234: wafer production series lot number 3rd line: Tracking code 814 814: packages made in '98, week 14 G: assembly house ID ...
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... Winbond customers using or selling these products for use in such applications their own risk and agree to fully indemnify Winbond for any damages resulting from such improper use or sale. Preliminary W83178S Winbond Electronics (H.K.) Ltd. Winbond Electronics North America Corp. ...