| part number | HEF4557B |
| manufacturer | NXP |
| lead free | ??? |
| prefix | U |
| Description | HEF4557B |
| octopart part number | |
| package | |
| RoHS | ??? |
| pin 14 description | length input |
| pin 9 activelow | True |
| pin 2 description | length control input |
| pin 5 activelow | True |
| pin 12 description | length input |
| pin 13 description | length input |
| pin 15 description | length input |
| pin 3 description | asynchronous master reset |
| pin 4 description | clock input (low-to-high edge-triggered) |
| pin 5 description | clock input (low-to-high edge-triggered) |
| pin 7 description | data input |
| pin 8 description | ground |
| pin 9 description | select data input |
| pin 11 activelow | True |
| pin 11 description | complementary output |
| pin 6 description | data input |
| pin 1 description | length control input |
| pin 16 description | supply voltage |
| pin 10 description | output |
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