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MIL-M-38510-380 Microcircuits, Digital, Bipolar, Advanced Low Power Schottky Ttl, Binary Counters, Cascadable, Monolithic SiliconThis specification covers the detail requirements for monolithic silicon, advanced low power Schottky TTL, binary 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 For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.3.

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MIL-M-38510/380B

SYNCHRONOUS TRUTH TABLE, DEVICE TYPES 01 AND 02

Inputs at time tn

Outputs at time tn+ 1

Clock

Enable

P

Enable

T

Load

A

B

C

D

Clear

QA

QB

QC

QD

Carry output

(RCO)

CP

L

x

H

x

x

x

x

H

NC

NC

NC

NC

NC

CP

x

L

H

x

x

x

x

H

NC

NC

NC

NC

L

CP

H

H

H

x

x

x

x

H

Previous count plus 1 (note 1)

H if count = 15

L if count < 15

CP

x

H

L

x

x

x

x

H

A

B

C

D

H if count = 15

L if count < 15

CP

x

L

L

x

x

x

x

H

A

B

C

D

L

CP

x

x

x

x

x

x

x

L

L

L

L

L

L

ASYNCHRONOUS TRUTH TABLE, DEVICE TYPE 01

Inputs at time tn

Outputs at time tn+ 1

Clock

Enable

P

Enable

T

Load

A

B

C

D

Clear

QA

QB

QC

QD

Carry output

x

x

x

x

x

x

x

x

L

L

L

L

L

L

UP COUNT SEQUENCE TABLE

NOTES:

1. See up count sequence table.

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

3. H = VIH for inputs, VOH for outputs.

4. x = VIH or VIL.

5. CP = Clock pulse.

6. NC = No change.

7. The last line of synchronous truth table does not apply to device type 01.

FIGURE 3. Truth tables.

17

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