ST1284-03A8RL STMicroelectronics, ST1284-03A8RL Datasheet - Page 3

• Manufacturer Part Number: ST1284-03A8RL
• Description: Switching Converters, Regulators & Controllers Parallel Port Term
• Manufacturer: STMicroelectronics

Specifications of ST1284-03A8RL

• Mounting: Surface Mount
• Pin Count: 28
• Operating Temperature Classification: Commercial
• Mounting Style: SMD/SMT
• Package / Case: QSOP-28
• Lead Free Status / RoHS Status: Compliant

FUNCTIONAL DIAGRAM
APPLICATION INFORMATION
The functional diagram here above presents a IEEE1284-A connector pinout and show how to connect
the ST1284-xxA8 in order to correctly terminate and filter the 17 signal lines. The IEEE1284-A connec-
tor 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 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
peripherals.
17 Select in
16 Reset
15 Error
14 Autofeed
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
10 Acknowledge
11 Busy
12 Paper Out
13 Select paper
Vcc
20
11
13
14
10
1
2
3
4
5
6
7
9
8
ST1284-xxA8
Vcc
Vcc
28
27
12
15
22
26
25
24
23
21
19
18
17
16
Gnd
1
13
14
25
ST1284-xxA8
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