Drop-In Replacement Chips for TI TMS9914A Controller
NI NAT9914 Series
• Automatic EOS and/or
NL message detection
• Handles DMA transfers
• Programmable data transfer rate
with T1 delays of 350 ns, 500 ns,
1.1 µs, and 2 µs
• Programmably compatible with
GPIB transceivers (TI, National
Semiconductor, and Motorola)
DBIN
WE#
CE#
ACCGR#
ACCRQ#
NC
VDD
TR
DIO1
DIO2
NC
• Register and pin compatible with
TI TMS9914A (40-pin DIP, 44-pin PLCC,
and 44-pin QFP versions)
• Meets all IEEE 488.2 requirements
• Bus-line monitoring
• Preferred implementation
of requesting service
• No messages sent when
there are no Listeners
• 20 MHz maximum programmable
clock rate
• Low-power CMOS design with
TTL-compatible inputs
Overview
40
39
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36
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34
33
32
31
30
29
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27
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VDD
TR
DIO1#
DIO2#
DIO3#
DIO4#
DIO5#
DIO6#
DIO7#
DIO8#
CONT#
SRQ#
ATN#
EOI#
DAV#
NRFD#
NDAC#
IFC#
REN#
TE
Figure 1. NAT9914BPD
NC
NRFD#
NDAC#
IFC#
REN#
TE
VSS
RESET#
CLK
D0
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
DAV#
EOI#
ATN#
SRQ#
CONT#
DIO8
DIO7
DIO6
DIO5
DIO4
DIO3
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34
22
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21
36
20
37
19
38
18
39
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40
16
41
15
42
14
43
13
44
12
1 2 3 4 5 6 7 8 9 10 11
NAT9914BPQ
NC
DIO2
DIO1
TR
VDD
NC
ACCRQ#
ACCGR#
CE#
WE#
DBIN
ACCRQ#
ACCGR#
CE#
WE#
DBIN
RS0
RS1
RS2
INT#
D7
D6
D5
D4
D3
D2
D1
D0
CLK
RESET#
VSS
NAT9914BPD
Figure 2. NAT9914BPQ
D1
D2
D3
D4
D5
D6
D7
INT#
RS2
RS1
RS0
RS0
RS1
RS2
INT
D7
D6
D5
D4
D3
D2
D1
NAT9914BPL
NC
D0
CLK
RESET
VSS
TE
REN
IFC
NDAC#
NRFD#
NC
The National Instruments NAT9914BPD, NAT9914BPL, and
NAT9914BPQ are drop-in replacement parts for the Texas Instruments
TMS9914A 40-pin DIP, 44-pin PLCC, and 44-pin QFP packages,
respectively. The NI NAT9914 is 100 percent register and pin compatible
with the 9914 on power-up and has additional features present in the
NAT4882 IEEE 488.2 Controller chip. Thus, the NAT9914 can perform all
interface functions defined by ANSI/IEEE Standard 488.1-1987 and
meets the additional requirements and recommendations of ANSI/IEEE
Standard 488.2-1992. The NAT9914 performs complete IEEE 488 Talker,
Listener, and Controller functions. The NAT9914 has the complete
register set and the identical pin configuration of the TI TMS9914A on
power-up, but has complete IEEE 488.2 Controller functionality through
software. You can take advantage of IEEE 488.2 with minimal software
changes. Although the default clock input is 5 MHz, the NAT9914 can
use clock input values up to 20 MHz for increased performance. The
NAT9914 can also run in NEC 7210 register-compatible mode with a
software command.
6 5 4 3 2 1 44 43 42 41 40
39
39
77
38
88
38
37
37
99
10
36
36
10
11
35
11
35
34
12
12
34
13
33
13
33
14
32
14
32
15
31
15
31
16
30
16
30
17
29
17
29
18 19 20 21 22 23 24 25 26 27 28
Figure 3. NAT9914BPL
DIO3
DIO4
DIO5
DIO6
DIO7
DIO8
CONT#
SRQ#
ATN#
EOI#
DAV#
If you are looking for alternatives to
existing TI TMS9914A chip suppliers
or planning to upgrade your designs to
IEEE 488.2 without hardware changes,
you should consider using the
NAT9914. Furthermore, because the
NAT9914 can accept faster clock
inputs, performance increases without
substantial firmware changes.
General Architecture
The NAT9914 manages the IEEE 488 bus. You can program the IEEE 488
bus by writing control words into the appropriate registers. CPU-readable
status registers supply operational feedback. The NAT9914 mode
determines the function of these registers. On power-up or reset, the
NAT9914 registers resemble the TNS9914A register set, with additional
registers that supply extra functionality and IEEE 488.2 compatibility.
In this mode, the NAT9914 is completely pin-compatible with the
TI TMS9914A. If you enable the 7210 mode, the registers resemble
those of the NEC µPD7210 set, with additional registers that supply
extra functionality and IEEE 488.2 compatibility. This mode is not pin
compatible with the NEC µPD7210.
Drop-In Replacement Chips for TI TMS9914A Controller
RoHS Compliance
The NAT9914 is currently available from NI both in a standard package
and as a RoHS-compliant chip. You can order the chips using the part
numbers shown below. The RoHS-compliant parts are identified through the
added “F” at the end of the part number and the chip itself is marked with
an e3 inside an ellipse to indicate a pure tin lead finish in accordance
with the marking recommendations defined in JEDEC JESD97. The
RoHS-compliant NAT9914 ASICs have a matte pure tin finish on their leads.
The RoHS-compliant NAT9914 meets industry requirements for baking
and maximum solder reflow temperature. The baking requirements are
outlined in JEDEC J-STD-033, and NI recommends using the solder reflow
profile as shown in IPC/JEDEC J-STD-020C with a peak temperature of
260 °C, the maximum temperature they can withstand. The Moisture
Sensitivity Level (MSL) for the RoHS-compliant surface mount
NAT9914 ASICs is 3 (the MSL is not applicable to the NAT9914BPDF
through-hole device).
Ordering Information
NI NAT9914BPD (40-pin DIP package)
RoHS-compliant ......................................................NAT9914BPDF-9
Standard ....................................................................NAT9914BPD-9
Sample kit (RoHS-compliant, 2 ASICs) ............................776730-01
NI NAT9914BPL (44-pin PLCC package)
RoHS-compliant......................................................NAT9914BPLF-27
Standard ..................................................................NAT9914BPL-27
Sample kit (RoHS-compliant, 2 ASICs) ............................776730-02
NI NAT9914BPQ (44-pin QFP package)
RoHS-compliant ....................................................NAT9914BPQF-84
Standard ..................................................................NAT9914BPQ-84
Sample kit (RoHS-compliant, 4 ASICs) ............................776730-03
Visit ni.com for a more detailed reference manual
and data sheet.
BUY NOW!
For complete product specifications, pricing, and accessory
information, call (800) 813 3693 (U.S.) or go to ni.com/gpib.
BUY ONLINE at ni.com or CALL (800) 813 3693 (U.S.)
2
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