HT6542B Datasheet, PDF (1/7 Pages) Holtek Semiconductor Inc – Keyboard Controller with PS/2

HT6542B
Keyboard Controller with PS/2
Features
• _{High reliability MOS technology}
• _{8042-type host interface}
• _{6MHz-12MHz operating frequency}
• _{Communicates with keyboard directly}
• _{Provides enhanced Gate A20 switching}
General Description
The HT6542B is a keyboard controller devel-
oped by Holtek with a 4-bit microprocessor. It is
pin-to-pin compatible with Intel 8042 keyboard
controller used in IBM PC’s. PC manufacturers
need not modify any printed wiring layout
when using the HT6542B in lieu of the Intel
• _{Support PS/2 compatible mouse}
• _{Auto-detect AT and PS/2 motherboard}
• _{Support 40 pin DIP and 44 pin PLCC pack-}
ages
8042 based keyboard controller. Furthermore,
the HT6542B can support a system clock speed
of up to 12MHz. The HT6542B can detect the
motherboard type automatically, therefore it
can be employed on both of AT and PS/2 moth-
erboard.
Pin Assignment
40 Pin DIP package
44 Pin PLCC package
1
30th Nov ’95