3/7

ST1284-xxA8/T8

14 Autofeed

15 Error

16 Reset

17 Select in

1 Strobe

2 Bit 1

3 Bit 2

4 Bit 3

5 Bit 4

6 Bit 5

7 Bit 6

8 Bit 7

9 Bit 8

13 Select paper

14

1

13

25

1

28

2

27

20

26

25

24

23

21

19

18

17

16

3

4

5

6

7

9

11

13

14

8

10

12

15

22

10 Acknowledge

11 Busy

12 Paper Out

Vcc

Vcc

Vcc

Gnd

ST1284-xxA8/T8

FUNCTIONAL DIAGRAM

The functional diagram here above presents a IEEE1284-A connector pinout and show how to connect

the ST1284-xxA8/T8 in order to correctly terminate and filter the 17 signal lines. The IEEE1284-A con-

nector is the PC standard for the host connection.

Control and status lines (from 10 to 17) only require a pull-up resistor (Rp) and a filter capacitor (C).

The data lines (from 2 to 9) and the STROBE (pin 1) also require a termination series resistor (Rs)

in addition to the pull-up resistor and a filter capacitor. The Vcc is connected to pin 20 and the

ground to pin 22.

The ST1284-xxA8/T8 can be used with all 3 types of connectors defined in the IEEE1284 standard:

- IEEE1284-A is a 25DB connector which is the PC standard for the host connection.

- IEEE1284-B is a 36 pin, 0.085 inch centerline connector used on the peripheral device.

- IEEE1284-C is a new 36 pin, 0.050 inch centerline connector which can be used for both host and peripher-

als.

APPLICATION INFORMATION