PACSZ1284-04QR datasheet(5/7 Pages) CALMIRCO

Part #	PACSZ1284-04QR

Description	P/ACTIVE IEEE 1284 ECP/EPP TERMINATION NETWORK

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Manufacturer	CALMIRCO [California Micro Devices Corp]

Direct Link	http://www.calmicro.com

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5 / 7 page

09/15/03

430 N. McCarthy Blvd., Milpitas, CA 95035-5112

L Tel: 408.263.3214

L Fax: 408.263.7846

L www.calmicro.com

5

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 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.

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 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 1: IEEE 1284 Termination Requirements

SIGNAL TERMINATION REQUIREMENTS

Signal Name

Series Termination

Data1 - Data8

Yes

Strobe

Yes

Init

Not Required

AutoFeedXT

Not Required

Selectin

Not Required

ACK

Not Required

Busy

Not Required

Paper Empty

Not Required

Select

Not Required

Fault

Not Required

1

14

1

19

1

2

20

= FLOW

THROUGH

SIGNALS

= GND

=VCC

SUPER 1284

1284-A Connector

Host

1284-B Connector

Peripheral

1284-C Connector

Host/Peripheral

25

13

36

18

36

18

19

Figure 3A:

Figure 3B:

Figure 3C:

= GND

= VCC

PACSZ1284

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