PACS1284 Ver la hoja de datos (PDF) - California Micro Devices Corp
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PACS1284 Datasheet PDF : 7 Pages
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PACS1284
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 resis-
tor 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 1,
in conjunction with the schematic diagram on page 1.
Table 1: 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 con-
nector which can be used for both host and periph-
eral.
Figure 2A shows a possible hook-up between the
1284-A connector on a PC motherboard and the
PACS1284, illustrating how the pin configuration of the
PACS1284 allows for easy interconnect between the
two. The dotted I/O signals of the PACS1284 will
typically be connected to a Super I/O chip on the
motherboard.
Figure 2B shows a possible hook-up between the
1284-B connector on a peripheral and the PACS1284.
Figure 2C shows a possible hook-up between the
1284-C connector and the PACS1284.
Figure 2A:
Figure 2B:
1284-A Connector
Host
14
25
1
13
1284-B Connector
Peripheral
19
1
PSAUCPSER12128844
1
= FLOW
= TGHRNOUDGH
=
VSIGNALS
CC
PSAUPCESR1122884
1
Figure 2C:
1284-C Connector
Host/Peripheral
36
20
19
2
18
1
36
18
= GND
= VCC
PSAUPCESR11228844
1
Figure 2. Example Connections of IEEE 1284 Connectors with PACS1284
© 2004 California Micro Devices Corp. All rights reserved.
06/07/04 430 N. McCarthy Blvd., Milpitas, CA 95035-5112 ▲ Tel: 408.263.3214 ▲ Fax: 408.263.7846 ▲ www.calmicro.com
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