MIL-M-38510-206 Microcircuit, Digital, 4096 Bit Schottky, Bipolar, Programmable Read-Only Memory PromThis specification covers the detail requirements for monolithic silicon, programmable read-only memory PROM microcircuits which employ thin film nichrome NiCr resistors, tungsten W or titanium tungsten TiW as the fusible link or programming element. Two product assurance classes and a choice of case outlines and lead finishes are provided and are reflected in the complete part number. A special test requirement is included in this specification to screen against devices which may contain excess moisture in the package materials or internal atmosphere see freeze-out test of 4.2d. For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.4.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-38510/206D

4.7 Programming procedure for circuit A. The programming characteristics in table IVA and the following procedures shall be used for programming the device.

a. Connect the device in the electrical configuration for programming. The waveforms on figure 6A and the programming characteristics in table IVA shall apply to these procedures.

b. Address the PROM with the binary address of the word to be programmed. Address inputs are TTL

compatible. An open circuit shall not be used to address the PROM.

c. Apply VPL voltage to VCC.

d. Bring the CE X inputs high and the CE X inputs low to disable the device. The chip enables are TTL

compatable. An open circuit shall not be used to disable the devices.

e. Disable the programming circuitry by applying a voltage of VOPD to the outputs of the PROM. f. Raise VCC to VPH with rise time less than or equal to tTLH.

g. After a delay equal to or greater than tD1 apply only one pulse with amplitude of VOPE and duration of tp to the output selected for programming. Note that the PROM is supplied with fuses intact, which generates an output high. Programming a fuse will cause the output to go low.

h. Lower VCC to VPL following a delay to tD2 from programming enable pulse applied to an output. i. Enable the PROM for verification by applying VIL to CE X and VIH to CE X .

j. Apply VPHV to VCC and verify bit is programmed.

k. Repeat steps a through j for all other bits to be programmed in the PROM.

l. If any bit does not veify as programmed, it shall be considered a programming reject.