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| MC74HC138A资料 | |
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MC74HC138A PDF Download |
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File Size : 116 KB
Manufacturer: Description:Two analog comparators. Full duplex UART. I2C communication port. Eight keypad interrupt inputs, plus two additional external interrupt inputs. Four interrupt priority levels. Watchdog timer with separate on-chip oscillator, requiring no external components. The watchdog timeout time is selectable from 8 values. Active low reset. On-chip power-on reset allows operation with no external reset components. Low voltage reset. One of two preset low voltage levels may be selected to allow a graceful system shutdown when power fails. May optionally be configured as an interrupt. Oscillator Fail Detect. The watchdog timer has a separate fully on-chip oscillator, allowing it to perform an oscillator fail detect function. Configurable on-chip oscillator with frequency range and RC oscillator options (selected by user programmed EPROM bits). The RC oscillator option allows operation with no external oscillator components. Programmable port output configuration options: quasi-bidirectional, open drain, push-pull, input-only. Selectable Schmitt trigger port inputs. LED drive capability (20 mA) on all port pins. Controlled slew rate port outputs to reduce EMI. Outputs have approximately 10 ns minimum ramp times. 15 I/O pins minimum. Up to 18 I/O pins using on-chip oscillator and reset options. Only power and ground connections are required to operate the 87LPC768 when fully on-chip oscillator and reset options are selected. Serial EPROM programming allows simple in-circuit production coding. Two EPROM security bits prevent reading of sensitive application programs. Idle and Power Down reduced power modes. Improved wakeup from Power Down mode (a low interrupt input starts execution). Typical Power Down current is 1 microamp. 20-pin DIP and SO packages. |
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| 1PCS | 100PCS | 1K | 10K | ||
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型 号：MC74HC138A 厂 家： 封 装：SOIC-16 批 号：09+ 数 量：30000 说 明：全新原装正品现货，专业供应 |
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运 费： 所在地： 新旧程度： |
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| 联系人：李利媛 |
| 电 话：0755/83019596,83247541,83247486 |
| 手 机：13480648723 |
| QQ：1104562168,1178139673,1113496577,2881934444,2881943289,2881943290 |
| MSN：ao-liteng01@hotmail.com,ao-liteng02@hotmail.com,ao-liteng03@hotmail.com,ao-liteng04@hotmail.com |
| 传 真：0755-83016216 |
| EMail：aoliteng1@163.com |
| 公司地址： 广东省深圳市福田区振兴西路新欣大厦B座518室 |
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