PAK-II Datasheet, PDF (6/28 Pages) List of Unclassifed Manufacturers – 310 Ivy Glen Court

and specials.
Pin Name
Type
Description
3
Busy/Mode Input/Output This pin has two functions. At start up, if the
pin is pulled up by a resistor, the PAK1 uses
this pin as a busy indicator. The pin will read 0
when the PAK is not busy. However, if at
startup the pin is pulled to ground, the PAK
will indicate its busy status on the Enable/
Busy pin.
2
Enable/
Input or
If Busy/Mode is pulled high at start up, the
Busy
Open
Enable/Busy pin is only an input. Bring it low
Collector
to disable the PAK, or high to enable it.
Output
However, if Busy/Mode is pulled low at start
up, this pin serves as an open-collector I/O
pin. If the host pulls the pin low, it disables the
PAK. If the PAK is busy, it pulls the pin low.
6
CLK
Input
The host pulses the CLK pin to shift data in or
out of the PAK II.
4
SIN
Input
The PAK II reads data from this pin. You may
short SIN and SOUT and use the same pin for
input and output if the host is capable of
treating a single pin as an I/O pin.
5
SOUT
Open
The PAK II writes data to the host on this pin.
Collector
Since the pin is open collector, you'll need a
Output
resistor to 5V on this pin. You may short SIN
and SOUT together to use one pin for I/O
1
RESET
Input
Hardware resets the PAK II when low.
7/8/ VSS
19
20 VDD
Power
Power
Ground - please connect all ground pins.
+5V
9
RES1
Clock
Connects to resonator
10 RES2
Clock
Connects to resonator
21- A0-A7
I/O
28
11- B0-B7
I/O
18
General purpose I/O
General purpose I/O