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PACSZ1284
APPLICATION INFORMATION
Termination Considerations
The IEEE 1284 specification requires both termination and EMI filtering on a total of 17 signal lines. Control and Status
lines (8 in total) only require a pull ? up resistor and a filter capacitor. The Data lines and Strobe also require a series termination
resistor in addition to the pull ? up resistors and filter capacitors. See Table 5, in conjunction with the schematic diagram on
page 2.
Table 5. IEEE 1284 TERMINATION REQUIREMENTS
Signal Termination Requirements
Signal Name
Data1 ? Data8
Strobe
Init
AutoFeedXT
Selectin
ACK
Busy
Paper Empty
Select
Fault
Series Termination
Yes
Yes
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Not Required
Interfacing to IEEE 1284 Connectors
IEEE 1284 defines three interface connectors:
? 1284 A is a 25 ? pin DB series connector which is the de facto PC standard for the host connection
? 1284 B is a 36 ? pin, 0.085 inch centerline connector used on the peripheral device
? 1284 C is a new 36 ? pin, 0.050 inch centerline connector which can be used for both host and peripheral
Figure 3A shows a possible hook ? up between the 1284 ? A connector on a PC motherboard and the PACSZ1284, illustrating
how the pin configuration of the PACSZ1284 allows for easy interconnect between the two. The dotted I/O signals of the
PACSZ1284 will typically be connected to a Super I/O chip on the motherboard.
Figure 3B shows a possible hook ? up between the 1284 ? B connector on a peripheral and the PACSZ1284
Figure 3C shows a possible hook ? up between the 1284 ? C connector and the PACSZ1284.
Figure 3. Example Connections of IEEE 1284 Connectors with PACSZ1284
Table 6 provides the IEEE 1284 signal assignments for the three connectors, and example PACSZ1284 pin connections.
When connecting a 1284 ? A host to a 1284 ? B peripheral, the “Peripheral Logic High” signal is not used. Similarly, when
a 1284 ? A host is connected to a 1284 ? C peripheral, the “Peripheral Logic High” and “Host Logic High” are not used. These
two signals are optionally used to detect a “Power Off” or “Cable Disconnect” state for host and peripheral, respectively.
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