ICS ICS2494 / ICS2494A / N / M / AN / AM (All variants) (Video/Memory Clock Generator)
Logs See all boards with this chip See all cards with this chip
dateType
Clock Synth / PLL
tag Also known as
  • ICS ICS2494-236 / ICS2494A-310 (Cirrus Logic GD-6410)
  • ICS ICS2494-237 / ICS2494A-304 (Tseng Labs ET4000/ET4000-W32, Acer M3125)
  • ICS ICS2494-240 (Texas Instruments TMS34010/34020)
  • ICS ICS2494-244 / ICS2494A-317 (Motherboard Applications (CPU Clocks))
  • ICS ICS2494-245 / ICS2494-307 (Generic)
  • ICS ICS2494-247 (Cirrus Logic GD5320)
  • ICS ICS2494-253 (NCR 77C22E)
  • ICS ICS2494-256 (S3 86C911/924)
  • ICS ICS2494-260 (Weitek W5086/5186)
  • ICS ICS2494-263 (NCR 77C22E)
  • ICS ICS2494-266 / ICS2494-318 (Cirrus Logic GD5410)
  • ICS ICS2494-271 / ICS2494-321 (Generic)
  • ICS ICS2494-273 (Headland HT216)
  • ICS ICS2494-275 (S3 86C801/805/928)
  • ICS ICS2494-277 (NCR 77C22E+)
  • ICS ICS2494-280 (S3 86C801/805)
  • ICS ICS2494-281 (Tseng Labs)
  • ICS ICS2494-306 (Cirrus Logic GD6410/6412)
  • ICS ICS2494-314 (Texas Instruments)
  • ICS ICS2494A-261 / ATI ATI18811 1 (ATI Mach32)
  • ICS ICS2494A-305 (S3 86C924)
  • ICS ICS2494A-319 (Generic)
  • ICS ICS2494A-320 (Avance Logic ALG2101/2201)
  • ICS ICS2494A-322 (Generic)
  • ICS ICS2494A-324 (Tseng Labs ET4000/ET4000-W32)
No additional family specs
doc 1 chip document available
Release date
File
Logs
Release date
File
Logs
drv No drivers available
notes Notes

ATI1811 1 Variant = ICS2494A-261, not listed in the datasheet.

Clock configuration:

ICS2494A-261 / ATI1811 1
VCLK 0 100.000
VCLK 1 126.000
VCLK 2 92.400
VCLK 3 36.000
VCLK 4 50.350
VCLK 5 56.640
VCLK 6 0?
VCLK 7 44.900
VCLK 8 135.000
VCLK 9 32.000
VCLK A 110.000
VCLK B 80.000
VCLK C 39.910
VCLK D 44.900
VCLK E 75.000
VCLK F 65.000
MCLK 0 ?
MCLK 1 ?
MCLK 2 ?
MCLK 3 ?

(source: https://pdos.csail.mit.edu/6.828/2017/readings/hardware/vgadoc/CLOCK.TXT)

Last updated 2025-05-04T03:03:20Z
image1 Image 1 of 2 (Eric Voirin (oerg866))
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