參數(shù)資料
型號(hào)： ST78C34IP40
廠商： EXAR CORP
元件分類： Parallel IO Port
英文描述： 8 I/O, PIA-PRINTER INTERFACE, PDIP40
封裝： 0.600 INCH, PLASTIC, DIP-40
文件頁(yè)數(shù)： 17/23頁(yè)
文件大?。?/td> 208K
代理商： ST78C34IP40
6-3
ST78C34
PLCC Package
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.
FEATURES
83 bytes of printer output FIFO
Bi-directional software parallel port
Bi-directional I/O ports
Register compatible to IBM XT, AT, compatible
386, 486
Selectable interrupt polarity
Selectable FIFO interrupts
ORDERING INFORMATION
Part number
Pin
Package
Operating temperature
ST78C34CJ44
44
PLCC
0° C to + 70° C
ST78C34CP40
40
PDip
0° C to + 70° C
ST78C34IJ44
44
PLCC
-40° C to + 85° C
ST78C34IP40
40
PDip
-40° C to + 85° C
Rev. 3.00
6
5
4
3
2
1
44
43
42
41
40
7
8
9
10
11
12
13
14
15
16
17
39
38
37
36
35
34
33
32
31
30
29
18
19
20
21
22
23
24
25
26
27
28
N.C.
INTSEL
D7
D6
D5
D4
D3
D2
D1
D0
N.C.
N.
C.
IN
T
XT
AL
1
XT
AL
2
-C
S
GND
RE
SE
T
-S
TR
O
B
E
-A
U
T
O
F
DX
IN
IT
-S
L
C
TIN
N.C.
PD7
PD6
PD5
PD4
PD3
PD2
PD1
PD0
GND
N.C.
N.
C.
PE
-A
C
K
BU
S
Y
SL
C
T
-E
RRO
R
VC
C
-I
O
R
-I
O
W
A1
A0
ST78C34CJ44
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