MIL-M-38510-208 Microcircuit, Digital, 4096-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, titanium-tungsten TiW, or zapped vertical emitter ZVE 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 For this product, the requirements of MIL-M-38510 have been superseded by MIL-PRF-38535, see 6.4.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-38510/208F

4.8  Programming procedure for circuit B.  The waveforms on figure 7b, the programming characteristics of table

IVB, and the following procedures shall apply:

a.  Connect the device in the electrical configuration for programming. b.  Raise VCC  to 5.5 volts.

c.   Address the PROM with the binary address of the selected word to be programmed.  Address inputs are

TTL compatible.

d.  Disable the chip by applying VIH  to the  CE 1  and  CE 2  and VIL  to the CE3  and CE4  inputs (device types 01 and 02) or VIH  to the CE input (device types 04 and 05).  The CE input is TTL compatible.

e.  Apply the VPP  pulse to the programming pin  CE 2   (device types 01 and 02) or  CE  (device types 04 and

05).  In order to insure that the output transistor is off before increasing the voltage on the output pin, the programming pin's voltage pulse shall precede the output pin's programming pulse by TD1  and leave after the output pin's programming pulse by TD2  (see figure 7b).

f.   Apply only one VOUT  pulse with duration of tP  to the output selected for programming.  The outputs shall be programmed one output at a time, since 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 high-level logic output.  Programming a fuse will cause the output to go to a low-level logic in the verify mode.

g.  Other bits in the same word may be programmed sequentially by applying VPP  pulses to each output to be programmed.

h.  Repeat 4.8c through 4.8g for all other bits to be programmed.

i.                Enable the chip by applying VIL to the  CE 1 and  CE 2   and VIH  to the CE3  and CE4  inputs (device types 01 and 02) or VIL  to the  CE  inputs (device types 04 and 05) and verify the program.  Verification may check

for a low output by requiring the device to sink 12 mA at VCC  = 4.0 V and 0.2 mA at VCC  = 7.0 V at

TA  = 25°C.

j.   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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