32-Bit Counter/Timers
NI 660x
• Up to eight 32-bit counter/timers
• 80 MHz maximum source frequency
(125 MHz with prescalers)
• Debouncing and glitch removal
• High-stability timebase
Operating Systems
• Windows 2000/NT/XP
• Real-time performance
with LabVIEW (p. 134)
• Others such as Linux and Mac OS X
(page 187)
(PXI-6608 only)
• GPS-based synchronization
(PXI-6608 only)
• NI DAQ driver simplifies
configuration and measurements
Recommended Software
• LabVIEW
• LabWindows/CVI
• Measurement Studio
Models
• NI PCI-6601
• NI PCI-6602
• NI PXI-6602
• NI PXI-6608
Other Compatible Software
• Visual Basic
• Visual C/C++, C#
Driver Software (included)
• NI-DAQ 7
Calibration Certificate Included
See page 21.
Overview and Applications
The PCI-6601 board features one NI-TIO ASIC for a total of four
NI 660x devices are timing and digital I/O (DIO) modules for PCI counter/timers. The counters are software-compatible with those
and PXI. They offer up to eight 32-bit counter/timers and up to found on E Series multifunction DAQ devices, but NI 660x devices
32 lines of 5 V TTL/CMOS-compatible digital I/O. You can perform offer additional capabilities.
a wide variety of buffered measurements or other counter/timer
Each counter has a gate, up/down, and source signal, which can be
tasks with NI 660x devices, including position or quadrature encoder controlled by external or internal signals. Each counter has one
measurement, event counting, period measurement, pulse-width output that can be routed externally or to other counters on the
measurement, frequency measurement, pulse generation, and pulse- device. 20 MHz and 100 kHz timebases are available on each device
train generation.
for use with each counter/timer. In addition, an 80 MHz timebase is
available on the NI 6602 and NI 6608 devices. A hardware trigger can
be used to start multiple counters simultaneously. See Table 1 for
more information.
Features
Counter/Timers
The NI 660x devices are equipped with the NI-TIO ASIC, a
National Instruments counter and digital I/O ASIC for advanced
timing and counting applications. Each NI 6602 and NI 6608 device
features two NI-TIO ASICs to provide a total of eight counter/timers.
Debouncing/
Glitch
Counter/
Timers
4
8
Max Source
Frequency
20 MHz1
Pulse
Buffered
Oscillator
GPS
Buffered Operations2
Family
NI 6601
NI 6602
Bus
Size
32 bits
32 bits
Compatibility
5 V TTL/CMOS
5 V TTL/CMOS
Digital I/O
Up to 32
Up to 32
Generation Operations
✓
✓
Removal Stability
Synchr.
–
–
DMA
1
3
Interrupt
3
5
PCI
PCI
PXI
PXI
✓
✓
✓
✓
50 ppm
50 ppm
80 MHz1
NI 6608
8
32 bits
80 MHz1
5 V TTL/CMOS
Up to 32
75 ppb
3
5
✓
✓
✓
✓
1Max Source Frequency with prescalers is 60 MHz for the NI 6601 and 125 MHz for the NI 6602 and NI 6608. These frequencies are dependent on drive strength of input signal and cable length. Consider these speeds to be the maximum. 2DMA transfers
have higher throughput than interrupt transfers.
Table 1. NI 660x Products Specifications Summary (See page 393 for detailed specifications.)
388 National Instruments • Tel: (800) 433-3488 • Fax: (512) 683-9300 • info@ni.com • ni.com
NI [ National Instruments ]
