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--- buildtips:components_compatibility_and_substitution [2016/07/05 23:17]
davidcary
+++ buildtips:components_compatibility_and_substitution [2016/07/06 00:09] (current)
davidcary mention other possible substitutions?
@@ Line 77: / Line 77: @@
   * 74LS Series bus drivers and transceivers, such as 74LS240, 74LS241, 74LS244, 74LS245 have hysteresis inputs (basically Schmidt triggers on inputs), newer TTL series ICs, such as 74F and 74ALS, and CMOS 74HCT, 74AHCT, 74ACT don't have it. This feature should reduce noise (ringing) during signal switching. It is not clear though that this feature is important for relatively slow ECB bus. Most ISA systems (with similar timing and frequencies) use 74F buffers and transceivers without any problems.
+====== Programmable logic device ICs ======
+===== Simple programmable logic devices =====
+PAL, PLA, PLD, SPLD, etc.
+Alas, many of them are one-time programmable.
+Can the erasable-and-reprogrammable GAL and EEPLD devices be programmed to be backwards compatible?
+===== CPLD =====
+"Atmel and Altera CPLD Compatibility Notes" ([[builderpages:abingham:cpld-compatibility]])
 ====== ASICs (Z80, Intel 8xxx, UART) ======