PACSZ1284_06 Datasheet, PDF (6/7 Pages) California Micro Devices Corp – IEEE 1284 Parallel Port ESD/EMI/Termination Network

PACSZ1284
Application Information (continued)
Table 2 provides the IEEE 1284 signal assignments for
the three connectors, and example PACSZ1284 pin
connections.
When connecting a 1284-A host to a 1284-B periph-
eral, the “Peripheral Logic High” signal is not used.
Similarly, when a 1284-A host is connected to a 1284-
C peripheral, the “Peripheral Logic High” and “Host
Logic High” are not used. These two signals are
optionally used to detect a “Power Off” or “Cable Dis-
connect” state for host and peripheral, respectively.
Table 2: IEEE 1284 Connector Pinouts and PACSZ1284 Connection Guidelines
PACSZ1284
PIN TYPE
1284-A
25-PIN DSUB
SIGNAL
PIN
P-Port conn. side, series-terminated (16-19, 21, or 23-26) STROBE
1
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 1
2
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 2
3
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 3
4
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 4
5
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 5
6
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 6
7
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 7
8
P-Port conn. side, series-terminated (16-19, 21, or 23-26)
Data 8
9
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
ACK
10
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
BUSY
11
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
PError
12
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
Select
13
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
AUTOFD
14
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
FAULT
15
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
INIT
16
Capacitor-filtered (1, 2, 8, 10, 12, 15, 27, or 28)
Selectin
17
Ground
18
Ground
19
Ground
20
Ground
21
Ground
22
Ground
23
Ground
24
Ground
25
1284-B
36-PIN CHAMP
SIGNAL
PIN
STROBE
1
Data 1
2
Data 2
3
Data 3
4
Data 4
5
Data 5
6
Data 6
7
Data 7
8
Data 8
9
ACK
10
BUSY
11
PError
12
Select
13
AUTOFD
14
FAULT
32
INIT
31
Selectin
36
Ground
19
Ground
20
Ground
21
Ground
22
Ground
23
Ground
24
Ground
25
Ground
26
Ground
27
Ground
28
Ground
29
Ground
30
Not Defined
33
Not Defined
34
Not Defined
35
Not Defined
15
Logic Ground
16
Chassis GND
17
Peripheral
18
Logic
1284-C
36-PIN HIGH
DENSITY
SIGNAL
PIN
STROBE
15
Data 1
6
Data 2
7
Data 3
8
Data 4
9
Data 5
10
Data 6
11
Data 7
12
Data 8
13
ACK
3
BUSY
1
PError
5
Select
2
AUTOFD
17
FAULT
4
INIT
14
Selectin
16
Ground
19
Ground
20
Ground
21
Ground
22
Ground
23
Ground
24
Ground
25
Ground
26
Ground
27
Ground
28
Ground
29
Ground
30
Ground
31
Ground
32
Ground
33
Ground
34
Ground
35
Not Required
36
Host Logic High 18
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