HT82K28A

HT82K28A Win98 Keyboard Encoder Features · · · · · · Designed for Windows 95/98/NT Supports 3 Windows 95 Keys Supports Power, Sleep and Wake-up Windows 98 ACPI functions Supports Japanese, Korean and Portuguese Supports Japanese DOS/V 106-key keyboard Supports code set 1, for PS/2 model 30 keyboard · · · · · · · Supports code set 2, for PC/AT, PS/2 model 50,60 keyboards Supports code set 3, for PS/2 model 80 keyboard RC oscillator Phantom key detection Minimal external components Pin-compatible with Holtek HT6547E-2 40-pin DIP/DICE form General Description The HT82K28A is a keyboard encoder especially designed for IBM PC/AT, IBM PS/2 and all compatible machines. The HT82K28A accepts keyboard inputs and contains a 16-character first-in-first-out buffer in which data is stored. An inexpensive RC oscillator can be used for the system clock. The device offers the advantage of simple implementation in high performance and low cost keyboard applications. Pin Assignment O S C 1 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 V S S V D D V S S IO 0 IO 1 C 2 C 3 C 4 C 5 C 6 C 7 R 1 0 R 1 1 R 1 2 R 0 R 1 R 2 R 3 R 4 4 0 3 9 3 8 3 7 3 6 3 5 3 4 3 3 3 2 3 1 3 0 2 9 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 C 1 C 0 D A T A C L O C K R 1 8 R 1 7 N C R 1 6 C A P N U M S C R L R 9 R 8 R 1 5 R 1 4 N C R 1 3 R 7 R 6 R 5 H T 8 2 K 2 8 A 4 0 D IP 1 February 16, 2000 HT82K28A Pin Description Pin No. 1 2, 4 3 5, 6 39, 40, 7~12 16~23, 28, 29, 13~15 24, 26, 27 33, 35 25, 34 30 31 32 37 38...