MIL-M-38510-209 Microcircuit, Digital, 8192-Bit, Schottky, Bipolar, Programmable Read-Only Memory Prom, Monolithic SiliconThis specification covers the detail requirements for monolithic silicon, PROM microcircuits which employ thin film nichrome NiCr resistors, zapped vertical emitter, tungsten W, titanium tungsten TiW, or platinum silicide as the fusible link or programming element. Two product assurance class 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 For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.4.

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MIL-M-38510I209H

4.11    Programming procedure for circuit E.  The waveforms on figure 5E, the programming characteristics in table IVE and the following procedures shall apply for programming the device:

a.  Connect the device in the electrical configuration for programming.

b.  Terminate all outputs with a 300 n resistor to VONP.  Apply VIHP to the  CE 2, CE3, and CE4 inputs and VILP to the  CE 1 inputs.

c.   Address the PROM with the binary address of the selected word to be programmed.  Raise VCC to VCCP.

d.  After a delay of t1, apply only one VOP pulse with a duration of tp, t2, and d(VOP) I dt to the output selected for programming.  After a delay of t2 and d(VOP) I dt, pulse  CE 2  from VIHP to VCEP for the duration of tP,

2d(VCE) I dt, and t3;  CE 2 is then to go to the VILP level.

e.  To verify programming after  CE 1 has been set to VILP, lower VCC to VCCL after a delay of t4.

The programmed output should remain in the logic "1" state.

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 4.11c through 4.11f for all other bits to be programmed.

h.  For class S and B devices, if any bit does not verify as programmed, it shall be considered a programming reject.

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