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PDF ST78C34 Data sheet ( Hoja de datos )
| Número de pieza | ST78C34 | |
| Descripción | GENERAL PURPOSE PARALLEL PRINTER PORT WITH 83 BYTE FIFO | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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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.
N.C. 7
INTSEL 8
D7 9
D6 10
D5 11
D4 12
D3 13
D2 14
D1 15
D0 16
DataSheet4U.coNm.C. 17
PLCC Package
ST78C34CJ44
39 N.C.
38 PD7
37 PD6
36 PD5
35 PD4
34 PD3
33 PD2
32 PD1
31 PD0
30 GND
29 N.C.
DataShee
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
ST78C34CJ44
ST78C34CP40
ST78C34IJ44
ST78C34IP40
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Pin
44
40
44
40
Rev. 3.00
Package
PLCC
PDip
PLCC
PDip
Operating temperature
0° C to + 70° C
0° C to + 70° C
-40° C to + 85° C
-40° C to + 85° C
6-3
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ST78C34
SYMBOL DESCRIPTION
et4U.com
Symbol
GND
Pin
40 44
20 23
Signal
type
O
Pin Description
Signal and power ground.
RESET
21 24
I
Master reset (active high). A high on this pin will reset all the
outputs and internal registers.
-STROBE
22 25 I/O General purpose I/O or strobe output (open drain active low, with
internal pull-up). To transfer latched data to the external peripheral
or printer.
-AUTOFDXT 23
26 I/O
General purpose I/O or line printer auto feed (open drain active
low, with internal pull-up). To signal the printer for continuous form
feed.
INIT 24 27 I/O General purpose I/O or line printer initialize (open drain active
Dhiagtha,Swheiteht4inUte.cronmal pull-up). To signal the line printer to enter
internal initialization routine.
-SLCTIN
25 28 I/O General purpose I/O or line printer select (open drain active low,
with internal pull-up). To select the line printer.
GND
26 30 O
Power and signal ground.
PD0-PD7
27-34 31-38 I/O
Bi-directional parallel ports (three state). To transfer data in or out
of the ST78C34 parallel port. PD7-PD0 are latched during output
mode.
A0-A1
36-37 40-41 I
Address lines. To select internal registers.
-IOW
38 42
I
Write strobe (active low). A low on this pin will transfer the contents
of the CPU data bus to the addressed register.
-IOR
39 43
I
Read strobe (active low). A low level on this pin transfers the
contents of the ST78C34 data bus to the CPU.
VCC
40 44
I
Power supply input.
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ST78C34
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AC ELECTRICAL CHARACTERISTICS
T =0° - 70° C, Vcc=5.0 V ± 10% unless otherwise specified.
A
Symbol
Parameter
Limits
Units
Min Typ Max
Conditions
T1 Clock high pulse duration
50
T2 Clock low pulse duration
50
T3 Clock rise/fall time
T8 Chip select setup time
5
T9 Chip select hold time
0
T12 Data setup time
10
T13 Data hold time
10
T14 -IOW delay from chip select
10
T15 -IOW strobe width
50
T16 Chip select hold time from -IOW
0
T17 Write cycle delay
55
Tw Write cycle=T15+T17
105
T19
T21
Data hold time
-IOR delay from chip select
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T23 -IOR strobe width
65
T24 Chip select hold time from -IOR
0
T25 Read cycle delay
55
Tr Read cycle=T23+T25
115
T26 Delay from -IOR to data
T39 -ACK pulse width
75
T40 PD7 - PD0 setup time
10
T41 PD7 - PD0 hold time
25
T42 Delay from -ACK low to interrupt low 5
T43 Delay from -IOR to reset interrupt
5
ns
ns External clock
10 ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
35 ns 100 pF load
ns
ns
ns
ns
ns
DataShee
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ST78C34.PDF ] | |
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