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Page Title:
Programming procedure identification. |
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|  MIL-M-38510/203E
4.6 Programming procedure identification. The programming procedure to be utilized shall be identified by the
manufacturer's circuit designator.
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 5a 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
compatible. 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 verify as programmed, it shall be considered a programming reject.
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