CY74FCT257T
- 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
- ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)
- 64-mA Output Sink Current
32-mA Output Source Current - 3-State Outputs
The CY74FCT257T has four identical two-input multiplexers that select four bits of data from two sources under the control of a common data-select (S) input. The I0 inputs are selected when S is low, and the I1 inputs are selected when S is high. Data at the output is noninverted.
The CY74FCT257T is a logic implementation of a four-pole, two-position switch, where the position of the switch is determined by the logic levels at S. Outputs are in the high-impedance state when the output-enable (OE\) input is high.
All but one device must be in the high-impedance state to avoid currents exceeding the maximum ratings if outputs are tied together. OE\ inputs must ensure that there is no overlap when outputs of 3-state devices are tied together.
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.
기술 자료
| 상위 문서 | 유형 | 직함 | 형식 옵션 | 최신 영어 버전 다운로드 | 날짜 | |
|---|---|---|---|---|---|---|
| * | 데이터 시트 | Quad 2-Input Multiplexer With 3-State Outputs datasheet (Rev. D) | 2001. 11. 2 | |||
| * | 사용 설명서 | CYFCT Parameter Measurement Information | 2001. 4. 2 |
설계 및 개발
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14-24-LOGIC-EVM — 14핀~24핀 D, DB, DGV, DW, DYY, NS 및 PW 패키지용 로직 제품 일반 평가 모듈
14-24-LOGIC-EVM 평가 모듈(EVM)은 14핀~24핀 D, DW, DB, NS, PW, DYY 또는 DGV 패키지에 있는 모든 로직 장치를 지원하도록 설계되었습니다.
| 패키지 | 핀 | CAD 기호, 풋프린트 및 3D 모델 |
|---|---|---|
| SSOP (DBQ) | 16 | Ultra Librarian |
| SOIC (D) | 16 | Ultra Librarian |
| SOIC (DW) | 16 | Ultra Librarian |