External Clock Input/Output; Counter; Non-Volatile Memory - Measurement Computing USB-7204 User Manual

USB-7204 User's Guide

External clock input/output

Parameter
Pin name
Pin type
Software-selectable direction
Input clock rate
Clock pulse width
Input leakage current
Input high voltage
Input low voltage
Output high voltage (Note 8)
Output low voltage (Note 8)
SYNC is a Schmitt trigger input and is over-current protected with a 1.5 kΩ series resistor.
Note 8:

Counter

Parameter
Pin name (Note 9)
Counter type
Number of channels
Input type
Input source
Resolution
Schmidt trigger hysteresis
Input leakage current
Input frequency
High pulse width
Low pulse width
Input high voltage
Input low voltage
CTR is a Schmitt trigger input protected with a 1.5K Ω series resistor.
Note 9:

Non-volatile memory

Parameter
EEPROM
EEPROM Configuration
Table 13. External clock I/O specifications
Conditions Specification
SYNC
Bidirectional
Output (default) Outputs internal A/D pacer clock.
Input Receives A/D pacer clock from external source.
50 KHz, max
Input mode 1 µs min
Output mode 5 µs min
Input mode ±1.0 µA
4.0 V min, 5.5 V absolute max
1.0 V max, –0.5 V absolute min
IOH = –2.5 mA
3.3 V min
No load 3.8 V min
IOL = 2.5 mA 1.1 V max
No load 0.6 V max
Table 14. Counter specifications
Specification
CTR
Event counter
1
TTL, rising edge triggered
CTR screw terminal
32 bits
20 mV to 100 mV
±1 µA
1 MHz max
500 ns min
500 ns min
4.0 V min, 5.5 V absolute max
1.0 V max, –0.5 V absolute min
Table 15. Non-volatile memory specifications
Specification
1,024 bytes
Address Range Access
0x000-0x1FF Reserved
0x200-0x3FF Read/write
25
Specifications
Description
512 bytes system and cal data
512 bytes user area