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PDF IOT7210 Data sheet ( Hoja de datos )
| Número de pieza | IOT7210 | |
| Descripción | Low Power CMOS IEEE 488 Controller Device | |
| Fabricantes | ETC | |
| Logotipo |  |
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IOT7210
Low-Power CMOS IEEE 488 Controller Device
NEW
Features
• Completely meets IEEE Standard
488-1978:
- SH1, source handshake
- AH1, acceptor handshake
- T5 or TE5, talker or extended talker
- L3 or LE3, listener or extended
listener
- SR1, service request
www.DataSh-eeRt4LU1.c, ormemote local
- PP1 or PP2, parallel poll, remote, or
local configuration
- DC1, device clear
- DT1, device trigger
- C1-C5, controller, all functions
• Programmable data transfer rate
• 16 registers, 8 read/8 write
• 2 address registers: detect MTA,
MLA, MSA (my talk/my listen/my
secondary addresses) and provide 2
device addresses
• End-of-string (EOS) message auto-
matic detection
• Automatic (IEEE Standard 488-78)
command processing and undefined
command read capability
• DMA-capable
• Programmable bus transceiver I/O
specification, Texas Instruments/
Motorola/Intel-compatible
• 1 MHz to 8 MHz clock range
• TTL-compatible
• CMOS
• +5V single power supply
• 40-pin plastic DIP or 44-pin plastic
TQFP
• 8080/85/86-compatible
The IOT7210 low-power CMOS intelligent
IEEE 488 controller meets all the functional
requirements for talkers, listeners, and
controllers as specified by the IEEE Stan-
dard 488-1978. It completely duplicates
the NEC µPD7210’s function and provides
enhancements such as lower power con-
sumption and increased speed. Fully com-
patible with most processor architectures,
the IOT7210 requires only the addition of
the bus driver/receiver components to
implement any IEEE 488 interface.
In its 40-pin plastic DIP package, the
IOT7210 provides users with a drop-in
replacement for the µPD7210 and elimi-
nates the need for either software or hard-
ware modifications. It is also available in
The IOT7210 is an enhanced replacement for the NEC µPD7210 IEEE 488 controller device
a 44-pin, 1.27 mm thick plastic TQFP
package for surface-mount applications.
IOT7210 Operation on
the IEEE 488 Bus
Since its introduction in the 1970s, the
IEEE 488 standard has become the most
popular means of interconnecting instru-
ments and controllers. This highly so-
phisticated standard has been refined over
the years to provide a great degree of
flexibility, permitting it to meet most
instrumentation requirements.
The IEEE 488 bus uses a common set of data
and control lines to interconnect up to 15
devices. The device’s capabilities are classi-
fied as a combination of talker, listener,
and/or controller. Devices that incorporate
the IOT7210 can perform all three func-
tions—talker, listener, and controller.
Data is transferred on the IEEE 488 bus in
a bit-parallel, byte-serial fashion over eight
bidirectional data lines. A 3-wire hand-
shake ensures synchronization of trans-
mission and reception and allows more
than one device to receive data at the
same time, with the slowest device con-
trolling the data rate. Other control lines
perform a variety of functions, such as
device addressing and interrupt genera-
tion. In addition to providing all the
control and data lines necessary for IEEE
488 operation, the IOT7210 provides a
flexible interface to the standard IEEE 488
transceivers.
The IOT7210 implements all the func-
tions (including timing) that are required
to interface to the IEEE 488 bus and pro-
vides high-level bus protocol manage-
ment, which frees the host processor for
other tasks. By performing these func-
tions in dedicated hardware, the IOT7210
ensures bus compatibility with other IEEE
488 devices.
The IOT7210 is controlled by its 16 inter-
nal registers. To reduce CPU overhead,
bus data bytes can be transferred to and
from the IOT7210 using DMA. The
IOT7210’s DMA feature is generic enough
that it can be used to interface to most
processors and buses.
1
1 page  
Timing Waveforms
www.DataSheet4U.com
CS, RS2-RS0
RD
D7 -D0
DACK
DRQ
DRQ
DACK
WR
CPU/DMA Read
tAD
t RR
t RD
High Impedance
tAD
t AKD
tAKRQ
t RA
Valid
t DF
t RV
High Impedance
DMA Write Timing
t DH
CS, RS2-RS0
WR
D7 -D0
CPU Write Timing
t AW t WA
t WW
t DW
t WD
t RV
5
5 Page 
Package Outlines
Item
A
B
C
D
www.DataSheet4U.com E
F
G
H
I
J
K
L
Millimeters
51.94-52.71
1.90-2.42
2.54 BSC
0.38-0.56
1.14-1.66
3.04-3.56
0.38-1.15
3.68-3.94
4.19-5.59
15.24-15.88
13.46-14.10
0.20-0.36
Package Outline for IOT7210P
G
BE
A
CD
H
I
F
J
K
L 0-15°
Side View
Package Outline for IOT7210T
Symbol
Min
Millimeter
Nom
Max
A-
- 1.27
A1 0.05 0.10 0.15
A2 0.95 1.00 1.12
D 12.00 BSC
D/2 6.00 BSC
D1 10.00 BSC
E 12.00 BSC
E/2 6.00 BSC
E1 10.00 BSC
L 0.45 0.60 0.75
e 0.80 BSC
b 0.30 0.37 0.45
c 0.09
-
0.18
D
D/2 D/2
D1
33 23
E/2 34
E E1
E/2 44
Index
22
12
1 11
eb
c
A A2
A1
See Detail
1.00
11°-13°
0.20 min
0.13 R
min
0° min
0.13/0.20 R
11°-13°
L 0°-7°
Detail
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet IOT7210.PDF ] | |
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