Input Characteristics

TM 11-6625-3060-10

Input Characteristics

TTL

Logic

Voltage

Current per

Series

Level

Unit Load

less than 0.7 V

-1.6 mA*

Standard

Power 54/74

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