MIL-M-38510-245 Microcircuits, Digital, Cmos, 4096 Bit, Static Random Access Memory Sram, Bulk Silicon And Silicon On SapphireThis specification covers the detail requirements for bulk silicon and silicon on sapphire SOS, static, 4096 bit, random access memory microcircuits. Two product assurance classes, four radiation hardness assurance levels, and a choice of case outlines and lead finishes are provided and are reflected in the 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 For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.4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-38510/2458

6.5.1     Timing parameter abbreviations.  All timing abbreviations use lower case characters with upper case character 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

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) ExAMPLE:

The example shows write pulse setup time defined as tWLEH - time from write enable low to chip enable high.

c.       Timing limits.  The table of timing values shows either a minimum or a maximum limit for each parameter. Input requirements are specified from the external system point of view.  Thus, address set-up time is shown as a minimum since the system must supply at least that much time (even though most devices do not require it).  On the other hand, responses from the memory are specified from the device point of view.  Thus, the access time is shown as a maximum since the device never provides data later than that time.

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