henry@utzoo.UUCP (Henry Spencer) (09/11/85)
Here's a summary of the replies I got from my inquiry about FIFO chips. The Z8060 is real, and is second-sourced by AMD. (One possible worry: Zilog is for sale, with its future uncertain.) The Z8060 apparently does tend to run rather hot, though, with 200mA or so of power needed. It is also a bit slow, although that's not very important for my application. The 2812 is 32x8 and is made by AMD and Plessey, but needs -12V. The preferred choice seems to be the Mostek MK4501, second-sourced by IDT. It's 512x9, has tri-state, single supply, respectably fast. It too is a bit of a power hog, 200mA or so, and it's in a 28-pin package. Otherwise, it looks good. 1024x9 versions are coming. The TRW 1030 is not second-sourced. Several people mentioned the old MMI parts, second-sourced by various people, but there were some disparaging comments about power dissipation, small size (they are x4), and cost. The TI 74S22_ series was mentioned, although there is some uncertainty about whether it still exists. It too is 4 bits wide. The RCA 40105 was mentioned, likewise a forthcoming 74HC(T)40105. Both CMOS. No indication of second source. The Signetics 8X60 is a chip that makes a static RAM act like a FIFO. The RAM can be made quite large. There was an allusion to a similar, perhaps identical, chip from MMI. This is not the compact-and-simple solution I was after, but may be of interest for other applications. Finally, there was mention of the SY2130 1024x8 dual-port RAM made by Synertek and apparently second-sourced by IDT. -- Henry Spencer @ U of Toronto Zoology {allegra,ihnp4,linus,decvax}!utzoo!henry