SN74HC590A是TI公司的一款计数器/算术/奇偶校验功能产品，SN74HC590A是具有三态输出寄存器的 8 位二进制寄存器，本页介绍了SN74HC590A的产品说明、应用、特性等，并给出了与SN74HC590A相关的TI元器件型号供参考。
SN74HC590A - 具有三态输出寄存器的 8 位二进制寄存器 - 计数器/算术/奇偶校验功能 - 特殊逻辑 - TI公司（Texas Instruments，德州仪器）
The 'HC590A devices contain an 8-bit binary counter that feeds an 8-bit storage register. The storage register has parallel outputs. Separate clocks are provided for both the binary counter and storage register. The binary counter features direct clear (CCLR)\ and count-enable (CCKEN)\ inputs. A ripple-carry output (RCO)\ is provided for cascading. Expansion is accomplished easily for two stages by connecting RCO\ of the first stage to CCKEN\ of the second stage. Cascading for larger count chains can be accomplished by connecting RCO\ of each stage to the counter clock (CCLK) input of the following stage.
CCLK and the register clock (RCLK) inputs are positive-edge triggered. If both clocks are connected together, the counter state always is one count ahead of the register. Internal circuitry prevents clocking from the clock enable.
- 2-V to 6-V VCC Operation
- High-Current 3-State Parallel Register Outputs Can Drive Up to 15 LSTTL Loads
- Low Power Consumption, 80-µA Max ICC
- Typical tpd = 14 ns
- ±6-mA Output Drive at 5 V
- Low Input Current of 1 µA Max
- 8-Bit Counter With Register
- Counter Has Direct Clear
