|
|
 |
|
|
 ULSI Math-Co DX
ULSI Math-Co SX, 20 MHz
ULSI Math-Co US83C87, 25 MHz
ULSI Math-Co US83C87, 25 MHz, variant
ULSI Math-Co US83C87, 25 MHz, USA
ULSI Math-Co US83C87, 33 MHz
ULSI Math-Co DX, 33 MHz
ULSI Math-Co DX, 40 MHz
ULSI Math-Co DX, 40 MHz, USA
ULSI Math-Co DX, 40 MHz, variant
ULSI US83C87 DX/DLC, 40 MHz
ULSI US83C87 DX/DLC, 40 MHz, variant
ULSI US83C87-C DX/DLC, 40 MHz
|
» ULSI overview
» all FPU chips
|
|
|
|
|
|
The ULSI Math Co-Processors
|
|
The ULSI 83C87 or Math-Co DX is an 80387-compatible coprocessor first introduced in early 1991, well after the IIT 3C87
and Cyrix 83D87 appeared. Like other 387 clones, it is somewhat faster than the
Intel 387DX, particularly in its basic arithmetic functions. The transcendental functions, however, show only a slight
speed improvement over the Intel 387DX.
Like other non-Intel 387 compatibles, the 83C87 does not support asynchronous operation of the CPU and the coprocessor. This means that the 83C87 always runs at the full
speed of the CPU. It is available in 20, 25, 33, and 40 MHz versions. The ULSI is produced in low power CMOS; power consumption at 20 MHz is max. 800 mW (400 mW typical),
at 25 MHz it is max. 1000 mW (500 mW typical), at 33 MHz it is max. 1250 mW (625 mW), and at 40 MHz it is max. 1500 mW (750 mW typical).
The 83C87 is packaged in a 68-pin ceramic PGA.
ULSI coprocessors come with a lifetime warranty. ULSI Systems, Inc., will replace the coprocessor up to three times free of charge should it ever fail to function properly.
|
|
|
|
|
|
