CY74FCT652T
- Function, Pinout, and Drive Compatible With FCT and F Logic
- Reduced VOH (Typically = 3.3 V) Version of Equivalent FCT Functions
- Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics
- Ioff Supports Partial-Power-Down Mode Operation
- Matched Rise and Fall Times
- Fully Compatible With TTL Input and Output Logic Levels
- 64-mA Output Sink Current
32-mA Output Source Current - Independent Register for A and B Buses
- Multiplexed Real-Time and Stored Data Transfer
- 3-State Outputs
The CY74FCT652T consists of bus transceiver circuits, D-type flip-flops, and control circuitry arranged for multiplexed transmission of data directly from the input bus or from the internal storage registers. GAB and GBA\ inputs control the transceiver functions. Select-control (SAB and SBA) inputs select either real-time or stored-data transfer. The circuitry used for select control eliminates the typical decoding glitch that occurs in a multiplexer during the transition between stored and real-time data. A low input level selects real-time data, and a high input level selects stored data.
Data on the A or B data bus, or both, can be stored in the internal D-type flip-flops by low-to-high transitions of the appropriate clock (CPAB or CPBA) inputs, regardless of the select or enable levels of the control pins. When SAB and SBA are in the real-time transfer mode, it also is possible to store data without using the internal D-type flip-flops by simultaneously enabling GAB and GBA\. In this configuration, each output reinforces its input. Thus, when all other data sources to the two sets of bus lines are at high impedance, each set of bus lines remains at its last state.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | 8-Bit Registered Transceiver With 3-State Outputs データシート (Rev. B) | 2001/10/24 | |||
| * | ユーザー・ガイド | CYFCT Parameter Measurement Information | 2001/04/02 |
設計と開発
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14-24-LOGIC-EVM — 14 ピンから 24 ピンの D、DB、DGV、DW、DYY、NS、PW の各パッケージに封止した各種ロジック製品向けの汎用評価基板
14-24-LOGIC-EVM 評価基板 (EVM) は、14 ピンから 24 ピンの D、DW、DB、NS、PW、DYY、DGV の各パッケージに封止した各種ロジック デバイスをサポートする設計を採用しています。
| パッケージ | ピン数 | CAD シンボル、フットプリント、および 3D モデル |
|---|---|---|
| SSOP (DBQ) | 24 | Ultra Librarian |
| SOIC (DW) | 24 | Ultra Librarian |