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SN74ALS528 Datasheet(PDF) 2 Page - Texas Instruments |
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SN74ALS528 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 7 page SN54ALS526, SN54ALS527, SN54ALS528 SN74ALS526, SN74ALS527, SN74ALS528 FUSE-PROGRAMMABLE IDENTITY COMPARATORS SDAS051A – JUNE 1984–REVISED MAY 1986 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 2 description The ’ALS526 and ’ALS528 are fuse-programmable identity comparators designed for easy programming in fixed-comparator applications. The ’ALS526 compares a 16-bit data word against a preprogrammed 16-bit data word while the ’ALS528 compares a 12-bit data word against a preprogrammed 12-bit data word. The P = Q output will go low when the applied data word (P inputs) matches the preprogrammed data word (Q represents the preprogrammed data word). Programming is easily accomplished on the bench or with conventional automatic test equipment. Special equipment such as PROM programmers are not required. The ’ALS527 is a combination of an 8-bit fuse-programmable comparator and a conventional 4-bit comparator. For the P = Q output to go low, the applied data word P0 through P7 must match the preprogrammed data word Q0 through Q7, and the applied data word P8 through P11 must match the applied data word Q8 through Q11. The SN54ALS526, SN54ALS527, and SN54ALS528 are characterized for operation over the full military temperature range of – 55 °C to 125°C. The SN74ALS526, SN74ALS527, and SN74ALS528 are characterized for operation from 0 °C to 70°C. programming procedure Before any fuses are blown, the inputs will recognize a low logic level. Therefore, only the bits that are to recognize a high logic level require programming. A fuse is blown by applying 12 volts (VIHH) to the desired P input and also to the G input. This permanently programs the pin to recognize a high. Only one input pin should be programmed at a time. Step 1. Take G to VIL and apply VIH to all P inputs†. Step 2. Take desired P input to VIHH, output will be low if the fuse is intact. Step 3. Pulse G to VIHH. After G has returned to VIL, the output will be high indicating that the fuse is blown. Step 4. Take P input back to VIH. Repeat steps 2 through 4 to program additional inputs. verification procedure These devices can be checked to determine which fuses, if any, are blown. Figure 1 shows how verification can be accomplished during programming. Step 1. Take G and all P inputs† to VIL. If the output is low, all fuses are intact. Step 2. Take all P inputs† to VIH. The output should be high except when all fuses are blown. If all fuses are blown then the output will be low. Step 3. Take test input to VIHH, leaving other inputs at VIH. If the output goes low, the fuse is intact. If the output goes high, the fuse is blown. Step 4. Take test input back to VIH. Repeat steps 3 and 4 to test additional inputs. † For the ’ALS527, P8 through P11 inputs must match the Q8 through Q11 inputs. |
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