8203 dynamic RAM memory
controller
The Intel 8203 is a Schottky bipolar
device housed in a 40-pin dual in-linepackage.
It provides a complete dynamic RAM controller for microprocessor systems and
expansion memories. All of the system control signals are provided to operate
and refresh the 2117, 2118 and 2164A dynamic RAMs. To accomplish this, the 8203
provides the following features:
- directly addresses one-half megabyte
of 2164A (with external drivers)
- provides address multiplexing and ~RAS, ~CAS, ~WE strobes
- provides a refresh timer and an 8-bit refresh address counter
- refresh may be internally selected for automatic refresh in a distributed
fashion
- refresh may be externally requested to provide for sychronous or transparent
refresh
- compatible with Intel 808-A, 8085A, iAPX 88 and iAPX 86 families of microprocessors
- provides system acnowledge and transfer acknowledge signals
- allows asynchronous memory and refresh cycle requests
- provisions for external clock or crystal oscillator
