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74F85
Datasheet
(Product Specification)
27-Sep-94, 10 pages, 97 kB
General description
The 74F85 is a 4-bit magnitude comparator that can be expanded to almost any length. It compares two 4-bit binary, BCD, or other monotonic codes and presents the three possible magnitude results at the outputs. The 4-bit inputs are weighted (A0?A3) and (B0?B3) where A3 and B3 are the most significant bits. The upper part of the table describes the normal operation under all conditions that will occur in a single device or in a series expansion scheme. In the upper part of the table the three outputs are mutually exclusive. In the lower part of the table, the outputs reflect the feed-forward conditions that exist in the parallel expansion scheme. The expansion inputs IA>B, and IA=B and I A<B are the least significant bit positions. When used for series expansion, the A>B, A=B and A<B outputs of the lease significant word are connected to the corresponding IA>B, I A=B and I A<B inputs of the next higher stage. Stages can be added in this manner to any length, but a propagation delay penalty of about 15ns is added with each additional stage. For proper operation, the expansion inputs of the least significant word should be tied as follows: IA>B = Low, IA=B = High, and IA<B = Low.
Features
- High-impedance NPN base inputs for reduced loading (20µA in High and Low states)
- Magnitude comparison of any binary words
- Serial or parallel expansion without extra gating
Products/packages
All type numbers in the table below are discontinued. See the table Discontinued information for more information.
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking | ECCN |
|---|---|---|---|---|---|---|---|
| N74F85D | N74F85D,512 | 9337 780 10512 | Discontinued Replacement product | SOT162-1
(SO16) | Tube Dry Pack | Standard Marking | |
| N74F85D | N74F85D,518 | 9337 780 10518 | Discontinued Replacement product | SOT162-1
(SO16) | Reel Dry Pack, SMD, 13" | Standard Marking |
Quality/reliability/chemical content
All type numbers in the table below are discontinued. See the table Discontinued information for more information.
| Type number | Orderable part number | Chemical content | RoHS | Leadfree Conversion date | RHF | IRF (FIT) | MTBF (hours) | MSL |
|---|---|---|---|---|---|---|---|---|
| N74F85D | N74F85D,512 | N74F85D |
| week 20, 2005 | 5,63 | 1,78E+08 | 1 | |
| N74F85D | N74F85D,518 | N74F85D |
| week 20, 2005 | 5,63 | 1,78E+08 | 1 |
Discontinued information
| Type number | Ordering code (12NC) | Last-time buy date | Last-time delivery date | Replacement product | DN Notice | Status | Comments |
|---|---|---|---|---|---|---|---|
| N74F85D | 933778010512 | 31-Mar-08 | 30-Jun-08 | $product.prunedProduct.eplacementPart | DN 59 |
| Limited Supply. Consult Marketing. |
| N74F85D | 933778010518 | 31-Mar-08 | 30-Jun-08 | $product.prunedProduct.eplacementPart | DN 59 |
| Limited Supply. Consult Marketing. |
Design support
Application Notes
AN216;
Arbitration in shared resource systems (1988-07-18)AN203;
Test Fixtures for High Speed Logic (1998-04-02)AN202;
Testing and specifying FAST logic (1987-06-01)Parametrics/similar products
| Type number | Package | Description | Propagation Delay(ns) | Voltage | No. of Pins | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|
| N74F85D | SOT162-1
(SO16) | 4-Bit Magnitude Comparator | 9.5 | 4.5-5.5 V | 16 | TTL | -1/+20 mA |
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74F85
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