MIL-M-38510-231 Microcircuits, Digital, Schottky Ttl, 1024 Bit Random Access Memory Ram, Monolithic SiliconThis specification covers the detail requirements for monolithic silicon, Schottky TTL, static, 1024 bit random access memory microcircuits. Two product assurance classes and a choice of case outlines/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 For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.4.

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MIL-M-38510/231C

6.4.1     Timing parameter abbreviations.  All timing abbreviations use upper case characters with no subscripts. The initial character is always T and is followed by four descriptors.  These characters specify two signal points arranged in a "from-to" sequence that define a timing interval.  The two descriptors for each signal point specify the signal name and the signal transitions.  Thus the format is:

T               x             x             x              x

Signal name from which interval is defined

Transition direction for first signal

Signal name to which interval is defined

Transition direction for second signal

a.        Signal definitions: A = Address

D = Data in

Q = Data out

W = Write enable

E = Chip enable

S = Chip select

G = Output enable

C = Change

b.        Transition definitions: H = Transition to high L = Transition to low

V = Transition to valid

x = Transition to invalid or don't care

Z = Transition to off (high impedance)

6.6  Logistic support.  Lead materials and finishes (see 3.4) are interchangeable.  Unless otherwise specified, microcircuits acquired for Government logistic support will be acquired to device class B (see 1.2.2), lead material and finish A (see 3.4).  Longer length leads and lead forming should not affect the part number

6.7  Substitutability.  The cross-reference information below is presented for the convenience of users. Microcircuits covered by this specification will functionally replace the listed generic-industry type.  Generic-industry microcircuit types may not have equivalent operational performance characteristics across military temperature

ranges or reliability factors equivalent to MIL-M-38510 device types and may have slight physical variations in relation to case size.  The presence of this information should not be deemed as permitting substitution of generic-industry

types for MIL-M-38510 types or as a waiver of any of the provisions of  MIL-PRF-38535.

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