General-Purpose Counter/Timer Specifications - Measurement Computing Data Translation DT9857 User Manual

General-Purpose Counter/Timer Specifications

Table 27 lists the specifications for the general-purpose counter/timer (C/T 0) on the DT9857
and DT9857E modules.
Table 29: General Purpose Counter/Timer Specifications
Number of general-purpose counter/timers
Internal reference clock
Resolution
Clock divider
Minimum:
Maximum:
Clock output
Minimum:
Maximum:
Maximum clock or gate input frequency
Minimum pulse width (minimum amount of time it takes a
C/T to recognize an input pulse)
Input voltage range
Inputs
Input logic load:
High input voltage:
Low input voltage:
Low input current:
Input termination:
Outputs
Output type:
High output:
Low output:
High output current:
Low output current:
Short circuit protected:
a. The integrity of the signal degrades at frequencies greater than 10 MHz.
Feature DT9857 and DT9857E Specifications
1
48 MHz
32 bits per channel
2
4,294,967,296
0.0112 Hz
24 MHz
a
24 MHz
50 ns
0 to 3.3 V (+5 V tolerance)
1 LVTTL
2.0 V minimum
0.8 V maximum
–0.2 mA maximum
Ω
22 k
LVTTL
2.4 V minimum
0.4 V maximum
–10 mA maximum
4 mA maximum
33 mA
Specifications
153