SN74HC590AN

TEXAS INSTRUMENTS  SN74HC590AN  芯片, 计数器, 二进制

The is a 8-bit Binary Counter with 3-state output 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.

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High-current 3-state parallel register outputs can drive up to 15 LSTTL loads

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Low power consumption, 80µA maximum ICC

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14ns Typical TPD

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±6mA Output drive at 5V

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Low input current of 1µA maximum

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8-bit counter with register

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Counter has direct clear