Measurement Computing USB-7204 - Manual (Page 25)

USB-7204 User's Guide Specifications
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Counter
Table 14. Counter specifications
Parameter Specification
Pin name (Note 9) CTR
Counter type Event counter
Number of channels 1
Input type TTL, rising edge triggered
Input source CTR screw terminal
Resolution 32 bits
Schmidt trigger hysteresis 20 mV to 100 mV
Input leakage current ±1 µA
Input frequency 1 MHz max
High pulse width 500 ns min
Low pulse width 500 ns min
Input high voltage 4.0 V min, 5.5 V absolute max
Input low voltage 1.0 V max, –0.5 V absolute min
Note 9: CTR is a Schmitt trigger input
protected with a 1.5K Ω series resistor.
Non-volatile memory
Table 15. Non-volatile memory specifications
Parameter Specification
EEPROM 1,024 bytes
EEPROM Configuration Address Range Access Description
0x000-0x1FF Reserved 512 bytes system and cal data
0x200-0x3FF Read/write 512 bytes user area
Microcontroller
Table 16. Microcontroller specifications
Parameter Specification
Type High performance 8-bit RISC microcontroller
Program Memory 32,768 words
Data Memory 3,936 bytes
Indicator LEDs
Table 17. Indicator LED specifications
Parameter Specification
Power LED (top) Indicates that the device’s microcontroller has power and is configured.
Status LED Blinks to indicate USB communications.
OEM power OEM Connector; LED sink current up to 5 mA per LED @ 5 V
max