DM74LS90N DATASHEET PDF

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All rights reserved. All of these counters have a gated zero reset and the DM74LS90 also has gated set-to-nine inputs for use in BCD nine's complement applications. To use their maximum count length decade or four bit binary , the B input is connected to the QA output. The input count pulses are applied to input A and the outputs are as described in the appropriate truth table.

A symmetri- cal divide-by-ten count can be obtained from the DM74LS90 counters by connecting the QD output to the A input and applying the input count to the B input which gives a divide-by-ten square wave at output QA. Specify by appending the suffix letter "X" to the ordering code. Note 2: Output QD is connected to input A for bi-quinary count. Note 3: Output QA is connected to input B. This permits driving the B input while maintaining full fan-out capability.

Note 9: Not more than one output should be shorted at a time, and the duration should not exceed one second. Note ICC is measured with all outputs open, both RO inputs grounded following momentary connection to 4.

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