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參數(shù)資料
| 型號： | SN54ALS527 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | FUSE-PROGRAMMABLE IDENTITY COMPARATORS |
| 中文描述： | 保險絲可編程身分比較器 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大小： | 95K |
| 代理商： | SN54ALS527 |
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 (V
IHH
) 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.
Step 2.
Step 3.
Step 4.
Take G to V
IL
and apply V
IH
to all P inputs
.
Take desired P input to V
IHH
, output will be low if the fuse is intact.
Pulse G to V
IHH
. After G has returned to V
IL
, the output will be high indicating that the fuse is blown.
Take P input back to V
IH
. 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.
Step 2.
Take G and all P inputs
to V
IL
. If the output is low, all fuses are intact.
Take all P inputs
to V
IH.
The output should be high except when all fuses are blown. If all fuses are
blown then the output will be low.
Take test input to V
IHH
, leaving other inputs at V
IH
. 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 V
IH
. Repeat steps 3 and 4 to test additional inputs.
Step 3.
For the ’ALS527, P8 through P11 inputs must match the Q8 through Q11 inputs.
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