© 2000 California Micro Devices Corp. All rights reserved.

8/25/2000

3

PACS1284-06

CALIFORNIA MICRO DEVICES

215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

www.calmicro.com

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.

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 PACS1284-06,

illustrating how the pin configuration of the PACS1284-06 allows for easy interconnects between the two. The dotted I/

O signals of the PACS1284-06 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 PACS1284-06.

Figure 3 shows a possible hook-up between the 1284-C connector and the PACS1284-06.

Sample Hook-ups of IEEE 1284 Connectors and PACS1284-06.

(connector and PACS1284-06 not drawn to scale)

Figure 1

Figure 2

Figure 3

E

M

A

N

L

A

N

G

I

S

N

O

I

T

A

N

I

M

R

E

T

S

E

I

R

E

S

8

a

t

a

D

-

1

a

t

a

Ds

e

Y

e

b

o

r

t

Ss

e

Y

t

i

n

Id

e

r

i

u

q

e

R

t

o

N

T

X

d

e

e

F

o

t

u

Ad

e

r

i

u

q

e

R

t

o

N

n

i

t

c

e

l

e

Sd

e

r

i

u

q

e

R

t

o

N

k

c

Ad

e

r

i

u

q

e

R

t

o

N

y

s

u

Bd

e

r

i

u

q

e

R

t

o

N

y

t

p

m

E

r

e

p

a

Pd

e

r

i

u

q

e

R

t

o

N

t

c

e

l

e

Sd

e

r

i

u

q

e

R

t

o

N

t

l

u

a

Fd

e

r

i

u

q

e

R

t

o

N

1

14

1

19

1

1

1

1

2

20

= FLOW

THROUGH

SIGNALS

= GND

=V

CC

SUPER 1284

SUPER 1284

SUPER 1284

1284-A Connector

Host

1284-B Connector

Peripheral

1284-C Connector

Host/Peripheral

25

13

36

18

36

18

19