CD74HC237
- Select One of Eight Data Outputs
- Active Low for CD74HC137 and CD74HCT137
- Active High for ’HC237 and CD74HCT237
- I/O Port or Memory Selector
- Two Enable Inputs to Simplify Cascading
- Typical Propagation Delay of 13ns at VCC = 5V, 15pF, TA = 25°C (CD74HC237)
- Fanout (Over Temperature Range)
- Standard Outputs. . . . 10 LSTTL Loads
- Bus Driver Outputs. . . . 15 LSTTL Loads
- Wide Operating Temperature Range . . . –55°C to 125°C
- Balanced Propagation Delay and Transition Times
- Significant Power Reduction Compared to LSTTL Logic ICs
- HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30%, of VCC at VCC = 5V
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il
1µA at VOL, VOH
Data sheet acquired from Harris Semiconductor
The CD74HC137, CD74HCT137, ’HC237, and CD74HCT237 are high speed silicon gate CMOS decoders well suited to memory address decoding or data routing applications. Both circuits feature low power consumption usually associated with CMOS circuitry, yet have speeds comparable to low power Schottky TTL logic.
Both circuits have three binary select inputs (A0, A1 and A2) that can be latched by an active High Latch Enable (LE) signal to isolate the outputs from select-input changes. A "Low" LE makes the output transparent to the input and the circuit functions as a one-of-eight decoder. Two Output Enable inputs (OE\1 and OE0) are provided to simplify cascading and to facilitate demultiplexing. The demultiplexing function is accomplished by using the A0, A1, A2 inputs to select the desired output and using one of the other Output Enable inputs as the data input while holding the other Output Enable input in its active state. In the CD74HC137 and CD74HCT137 the selected output is a "Low"; in the ’HC237 and CD74HCT237 the selected output is a "High".
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 | CD74HC137, CD74HCT137, CD54HC237, CD74HC237, CD74HCT237 データシート (Rev. F) | 2003/10/13 |
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 |
|---|---|---|
| PDIP (N) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | Ultra Librarian |
| SOP (NS) | 16 | Ultra Librarian |
| SOIC (D) | 16 | Ultra Librarian |
| SOT-23-THN (DYY) | 16 | Ultra Librarian |