I know of an ancient ('90s) IBM Microchannel board to be used in ATMs which had a WD20C03A DES IC:

(C)WDC'85
WD20C03A JH-08
08 9035

This is what I found about it digging in the 'net:

DESCRIPTION: Uses si-gate CMOS, TTL compatible; ECB and CBC, speeds of up tp 403 Kbytes per second (5 MHz clock speed), 645 Kbytes per second (8 MHz clock speed), and 807 Kbytes per second (10 MHz clock speed); in ECB mode a total of 98 clock times are needed for the algorithm (48), reset for propagation delay (1), load (24), and unload (24); available in standard 8080A interface and is pin to pin compatible with WD2001; this is a 5 volt only
part.