SUPER1284 Datasheet, PDF (3/5 Pages) California Micro Devices Corp – P/ACTIVE IEEE 1284 ECP/EPP TERMINATION NETWORK

CALIFORNIA MICRO DEVICES
SUPER 1284
Application Information
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 resistors and filter capacitors. See Table 1 and Schematic Diagram.
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
Table 1
IEEE 1284 defines three interface connectors:
- 1284 A is a 25-pin DB series connector which is the defacto 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 1 shows a possible hook-up between the 1284-A connector on a PC motherboard and the Super 1284, illustrating
how the pin configuration of the Super 1284 allows for easy interconnects between the two. The dotted I/O signals of the
Super 1284 will typically be connected to a Super I/O chip on the motherboard.
Figure 2 shows a possible hook-up between the 1284-B connector on a peripheral and the Super 1284.
Figure 3 shows a possible hook-up between the 1284-C connector and the Super 1284.
Sample Hook-ups of IEEE 1284 Connectors and Super 1284.
(connector and Super 1284 not drawn to scale)
1284-A Connector
Host
14
25
1
13
1284-B Connector
Peripheral
19
1
SUPER 1284
1
= FLOW
THROUGH
SIGNALS
SUPER 1284
1
1284-C Connector
Host/Peripheral
36
20
19
2
18
1
36
18
= GND
= V_CC
SUPER 1284
1
Figure 1
Figure 2
Figure 3
© 1998 California Micro Devices Corp. All rights reserved.
7/98 Rev. 1
215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com
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