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ST78C34CJ44 Datasheet

  • ST78C34CJ44

  • GENERAL PURPOSE PARALLEL PRINTER PORT WITH 83 BYTE FIFO

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ST78C34
GENERAL PURPOSE PARALLEL
PRINTER PORT WITH 83 BYTE FIFO
DESCRIPTION
The ST78C34 is a monolithic Bidirectional Parallel
port designed to operate as a general purpose I/O port.
It contains all the necessary input/output signals to be
configured as a CENTRONICS printer port.
The ST78C34 is a general purpose input/output con-
troller with 83 byte internal FIFO. FIFO operation can
be enabled or disabled. For CENTRONICS printer
operation, all registers are mapped to IBM printer port
registers.
The ST78C34 is designed to operate as normal
printer interface without any additional settings. Con-
tents of the FIFO will be cleared after reset or setting
the INIT pin to a low state. The auto FIFO operation
starts after the first -ACK is received from the printer.
Contents of the FIFO transfer to the printer at the
printer loading speed.
PLCC Package
-ERROR
BUSY
SLCT
-ACK
-IOW
VCC
-IOR
N.C.
PE
A1
41
44
43
42
N.C.
INTSEL
D7
D6
D5
D4
D3
D2
D1
D0
N.C.
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
40
39
38
37
36
35
6
5
4
3
2
1
A0
N.C.
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
GND
N.C.
ST78C34CJ44
34
33
32
31
30
29
RESET
-STROBE
XTAL1
XTAL2
GND
N.C.
-AUTOFDX
INIT
-CS
INT
FEATURES
路
83 bytes of printer output FIFO
路
Bi-directional software parallel port
路
Bi-directional I/O ports
路
Register compatible to IBM XT, AT, compatible
386, 486
路
Selectable interrupt polarity
路
Selectable FIFO interrupts
ORDERING INFORMATION
Part number
Pin
Package
Operating temperature
ST78C34CJ44
ST78C34CP40
ST78C34IJ44
ST78C34IP40
44
40
44
40
PLCC
PDip
PLCC
PDip
0擄 C
0擄 C
-40擄 C
-40擄 C
to + 70擄 C
to + 70擄 C
to + 85擄 C
to + 85擄 C
Rev. 3.00
6-3
-SLCTIN

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