MIL-M-38510-25 Microcircuits, Digital, Bipolar, Ttl, Low Power, Counters, Monolithic SiliconThis specification covers the detail requirements for monolithic silicon, Schottky TTL, binary and decade counters. Two product assurance classes and a choice of case outlines and lead finishes are provided for each type and are reflected in the complete part number. For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.4.

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Inputs at time tn

Outputs at time tn+1

Count

down

Load

Clear

Carry

Borrow

Count up

Count down

Count up

Count down

L if count = 15

H if count > 15

L if count = 0

H if count ≠ 0

Previous count plus 1 (note 1)

L if count = 15

H if count > 15

Previous count minus 1 (note 2)

L if count = 0

H if count ≠ 0

DEVICE TYPE 03

NOTES:

1. See up count sequence table.

2. See down count sequence table.

3. L = VIL for inputs, VOL for outputs.

4. H = VIH for input, VOH for outputs.

5. X = VIH or VOH.

6. NC = no change.

7. NA = not applicable.

8. P = Positive going pulse.

FIGURE 2. Truth table - Continued.