EPROM

mcmaster

PE-TL866-8

• PE-140T
• TL866
• 8" akro mills box
• Put in corner, spaced off with 1.5" t-slot

50%: the first time that 50% or more of bits are reported erased

120%: when all of the bits have been erased consistently for 20% of the runtime (actually 20% / 80% => 25% more than erased)

Vendor	Model	Setup	Log file	Passes	Erase 50% (u)	Erase 50% (std)	Erase 120% (u)	Erase 120% (std)	Note
	M27128A	PE-TL866-8	2018-08-23_05_m27128a	25			932.3	9.5
	M27128A	PE-TL866-8	2018-08-23_06_m27128a	1	112.3

M27128A

 M27128A @DIP28 erase avg: 932.3 sec, stdev: 9.5 sec
 912.0
 928.2
 928.1
 941.7
 935.3
 926.5
 926.8
 919.7
 944.2
 925.6
 941.4
 929.2
 932.5
 932.6
 956.2
 926.4
 926.5
 925.9
 941.6
 944.1
 920.1
 934.8
 935.2
 929.7
 943.9

TMS27C256

 TMS27C256 @DIP28 @ 9 passes
 120% erase avg: 2563.2 sec, stdev: 220.7 sec
   2077.6
   2300.7
   2458.8
   2490.3
   2621.7
   2658.7
   2704.9
   2744.7
   2783.6
   2790.9
 50% erase avg: 1398.0 sec, stdev: 118.7 sec
   1123.6
   1260.6
   1340.4
   1389.3
   1426.0
   1456.9
   1475.5
   1491.0
   1501.6
   1514.6

https://cdn1.goughlui.com/wp-content/uploads/2016/04/eprom-erase-speed.gif