TM 11-6625-3060-10
Input Characteristics
TTL
Logic
Voltage
Current per
Series
Level
Level
Unit Load
0
less than 0.7 V
-1.6 mA*
Standard
Power 54/74
1
2.4 to 5.25 V
40 uA
*The "- " current indicates that current out of the input (external command device) must sink
(absorb this current). A standard power (Series 54/74) TTL output will sink and source 10 unit
loads.
Input Current
All input terminals have Internal current. The current sourced by this current when the input is brought to a logic level 0
is Included in the loading shown in the Current per Unit Load column of the chart above.
Triggering
To trigger an encode cycle, the trigger line must be transferred from logic "1" to logic "O". Limits for trigger pulse
characteristics are shown below.
2-18
