5340A Integrated Circuits Theory Of Operation; And 1816-0185 - HP 5340A Operating And Service Manual

4-7. 5340A INTEGRATED CIRCUITS
4-8. The 5340A uses 70 different types of integrated circuits. Twenty-two of these are basic logic
gates described in Paragraph 4-3. The following paragraphs describe the integrated circuits used
in the 5340A other than the basic logic types.
4-9. 256-Bit Read-Only-Memories 1816-0003,1816-0004,1816-0184,
4-10. A read-only-memory is a device that allows storage of pre-programmed data for later
retrieval. The 1816 series of ROM's are 16-pin dual in-line IC's that allow eight different bits
to be stored for each of the 32 addresses. The five input lines give rise to
nations of input addresses. Figure 4-3 shows the pin connections for the 1816 series.
Figure 4-3. Logic Diagram for 1816-0003, 1816-0004, 1816-0184, and 1816-0185 ROM's
INPUT
ADDRESSES
4-11. One use of
to perform transformation. For example, a ROM could be used to output (in binary) the equiv-
alent Fahrenheit temperature for a given centrigrade temperature. ROM's can also be used fok
other simple transforms. For example, assume it is desired to solve the equation Y
For any value of X (from 0 to 31), a ROM could be pre-programmed to give the value of
satisfies the above equation. Table 4-1 lists the data that would be pre-programmed for this
example.
, -
. I
-'-
E N A B L E
ROM's is in calculators where they are used to store conversion information or
THEORY OF OPERATION
BO
Model 5340A
Theory of Operation
and
1816-0185
32 possible combi-
=
1
EIGHT-BIT
WORD OUTPUT
2 X +1.
Y
that
4-3