MIL-M-38510-210 Microcircuit, Digital, 16,384 Bit Schottky, Bipolar, Programmable Read-Only Memory Prom Monolithic SiliconThis specification covers the detail requirements for monolithic silicon, programmable read-only memory PROM microcircuits which employ thin film nichrome NiCr resistors, platinum-silicide, tungsten W, titanium-tungsten TiW or zapped vertical emitter 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. For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.4.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-38510/210F

f.   The outputs should be programmed one output at a time, since the internal decoding circuitry is capable of sinking only one unit of programming current at a time.  Note that the PROM is supplied with fuses generating a low-level logic output.  Programming a fuse will cause the output to go to a high level logic in the verify mode.

g.  Repeat 4.16b through 4.16f for all other bits to be programmed.

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

4.17  Programming procedures for circuit J.  The programming characteristics in table IVJ 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 5J and the programming characteristics of table IVJ shall apply to these procedures.

b.  Address the PROM with the binary address of the selected word to be programmed.  Address inputs are TTL compatible.  An open circuit should not be used to address the PROM.

c.   Disable the chip by applying input high (VIH) to the  CS  input.   CS  input must remain at VIH  for programming.  The chip select is TTL compatible.  An open circuit should not be used to disable the chip.

d.  Disable the programming circuitry by applying an Output Voltage Disable of less than VOPD  to the output of the PROM.  The output may be left open to achieve the disable.

e.  Raise VCC  to VPH  with rise time equal to tr.

f.   After a delay equal to or greater than td, apply a pulse with amplitude of VOPE  and duration of tP  to the output selected for programming.  Note that the PROM is supplied with fuses intact generating an output high.  Programming a fuse will cause the output to go low in the verify mode.

g.  Other bits in the same word may be programmed while the VCC  input is raised to VPH  by applying output enable pulses to each output which is to be programmed.  The output enable pulses must be separated

by a minimum interval of td.

h.  Lower VCC  to 4.5 V following a delay of td from the last programming enable pulse applied to an output. i.    Enable the PROM for verification by applying a logic "O" (VIL) to the  CS  input.

j.    Repeat 4.17a through 4.17i for all other bit to be programmed in the PROM.

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

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