Measurement Computing

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USB-CTR Series

Specifications

All specifications are subject to change without notice. Typical for 25°C unless

noted otherwise.

These specifications apply to both USB-CTR Series standard and OEM versions

unless noted otherwise.

Counter

Counter type: FPGA

Counters

USB-CTR08: 8

USB-CTR04: 4

Each counter channel has a corresponding input, gate, and output connector

Counter input modes: Totalize, Pulse width, Period, Timing

Mode options: Non-Recycle, range limit, clear on read, up/down

Gate options: Clear|reload, direction control, gate, count trigger; mode dependent

Resolution: Up to 64-bits (software-selectable)

Maximum input frequency: 48 MHz

Debounce times: 16 steps from 500 ns to 25.5 ms; positive or negative edge sensi-

tive; glitch detect mode or debounce mode; software-selectable.

Timebase and accuracy: 96 MHz (24 MHz – 30 ppm with a 4x DLL (delay-locked

loop))

Counter read pacer: Internal or external scan pacer up to 4 MHz

Period/pulse width/timing resolution: 20.83 ns; 208.3 ns; 2.083 µs; or 20.83 µs

Input type (counter input and gate connectors): Schmitt trigger, 47 kΩ pull-

down to ground with 33 Ω in series

Schmitt trigger hysteresis (C0IN to C7IN and C0GT to C7GT): 0.76 V typ,

0.4 V min, 1.2 V max

Input high voltage threshold (C0IN to C7IN and C0GT to C7GT): 1.74 V typ,

1.3 V min, 2.2 V max

Input high voltage limit (C0IN to C7IN and C0GT to C7GT): 5.5 V absolute max

Input low voltage threshold (C0IN to C7IN and C0GT to C7GT): 0.98 V typ,

0.6 V min, 1.5 V max

Input low voltage limit (C0IN to C7IN and C0GT to C7GT): –0.5 V absolute

min, 0 V recommended min

Output high voltage: 4.4 V min (IOH = –50 µA); 3.76 V min (IOH = –24 mA)

Output low voltage: 0.1 V max (IOL = 50 µA); 0.44 V max (IOL = 24 mA)

Output current: 24 mA max per pin, constrained to 240 mA across all output pins

(counter outputs, timer outputs, digital outputs, pacer clock output, and +VO)

Timers

Terminal names: TMR0, TMR1, TMR2, TMR3

Timer type: PWM output with count, period, delay, and pulse width registers

Output value: Default state is idle low with pulses high, software-selectable

output invert

Internal clock frequency: 96 MHz

Effective frequency range: 0.022 Hz to 48 MHz

Register widths: 32-bit

High pulse width: 10.42 ns min

Low pulse width: 10.42 ns min

Output high voltage: 4.4 V min (IOH = –50 µA); 3.76 V min (IOH = –24 mA)

Output low voltage: 0.1 V max (IOL = 50 µA); 0.44 V max (IOL = 24 mA)

Output current: 24 mA max per pin, constrained to 240 mA across all output pins

(counter outputs, timer outputs, digital outputs, pacer clock output, and +VO)

Digital Input/Output

Digital type: TTL

Number of I/O: 8

Configuration: Bit-configurable as input (power on default) or output

Pull-up configuration: The port has a 47 k

Ω resistor configurable as a pull-up or

pull-down (default) with an internal jumper.

Digital I/O transfer rate (system-paced, asynchronous): 33 to 8000 port reads/

writes or single bit reads/writes per second typical, system dependent.

Digital input pacing: Onboard clock, external input scan clock (CLKI)

Digital input trigger source: External single channel digital trigger (TRIG)

Input high voltage: 2.0 V min, 5.0 V absolute max

Input low voltage: 0.8 V max, 0 V recommended min

Output high voltage: 4.4 V min (IOH = –50 µA), 3.76 V min (IOH = –24 mA)

Output low voltage: 0.1 V max (IOL = 50 µA), 0.44 V max (IOL = 24 mA)

Output current: 24 mA max per pin, constrained to 240 mA across all output pins

(counter outputs, timer outputs, digital outputs, pacer clock output, and +VO)

External Trigger

Trigger source: External digital; TRIG terminal

Trigger mode: Software-selectable for edge or level sensitive, rising or falling

edge, high or low level.

Trigger latency: 100 ns max

Trigger pulse width: 100 ns min

Input type: Schmitt trigger, 47 k

Ω pull-down to ground with 33 Ω in series

Schmitt trigger hysteresis: 0.76 V typ, 0.4 V min, 1.2 V max

Input high voltage threshold: 1.74 V typ, 1.3 V min, 2.2 V max

Input high voltage limit: 5.5 V absolute max

Input Low voltage threshold: 0.98 V typ, 0.6 V min, 1.5 V max

Input low voltage limit: –0.5 V absolute min, 0 V recommended min

External Clock Input/Output

Terminal names: CLKI, CLKO

Terminal type

CLKI: Input, active on rising edge

CLKO: Output, power on default is 0 V, active on rising edge

Input clock frequency: 4 MHz, max

Input clock pulse width:10.417 ns min

Input type: Schmitt trigger, 47 kΩ pull-down to ground with 33 Ω in series

Input Schmitt trigger hysteresis: 0.76 V typ, 0.4 V min, 1.2 V max

Input high voltage threshold: 1.74 V typ, 1.3 V min, 2.2 V max

Input high voltage limit: 5.5 V absolute max

Input low voltage threshold: 0.98 V typ, 0.6 V min, 1.5 V max

Input low voltage limit: –0.5 V absolute min,0 V recommended min

Output clock frequency: 4 MHz, max

Output clock pulse width: 10.417 ns

Output high voltage: 4.4 V min (IOH = –50 µA), 3.78 V min (IOH = –24 mA)

Output low voltage: 0.1 V max (IOL = 50 µA), 0.44 V max (IOL = 24 mA)

Output current: 24 mA max per pin, constrained to 240 mA across all output pins

(counter outputs, timer outputs, digital outputs, pacer clock output, and +VO)

Memory

FIFO: 8 KS

Non-volatile EEPROM: 32 KB (10 KB firmware storage, 22 KB calibration/user data)

Power

Supply current, USB source

During enumeration: < 100 mA

After USB enumeration: < 500 mA

+VO power available: After USB enumeration: 5 V, ± 5%

+VO output current: After USB enumeration: 24 mA max per pin, constrained to

240 mA across all output pins (counter outputs, timer outputs, digital outputs,

pacer clock output, and +VO)

USB

USB device type: USB 2.0 (high-speed)

Device compatibility: USB 1.1, USB 2.0, USB 3.0

USBcabletype:A-Bcable,ULtypeAWM2725orequivalent.(min24AWGVBUS/GND,

min 28 AWG D+/D–)

USB cable length: 3 m (9.84 ft) max

Environmental

Operating temperature range: 0 °C to 50 °C

Storage temperature range: –40 °C to 70 °C

Humidity: 0% to 90% non-condensing

Mechanical

Dimensions (L × W × H)

Standard versions: 127 × 89.9 × 35.6 mm (5.00 × 3.53 × 1.40 in.)

OEM versions: 127 × 89.9 × 35.6 mm (4.7 × 3.4 × 0.60 in.)

User connection length: 3 m (9.84 ft) max

Signal Connector

Standard versions: Two banks of screw-terminal blocks

Wire gauge range: 16 AWG to 30 AWG

OEM versions: Two 1 × 28 pin 0.1 in. pitch headers, labeled W1 and W3

Specifications