器件名称:
74HC590
功能描述:
8-BIT BINARY COUNTERS WITH 3-STATE OUTPUT REGISTERS
文件大小:
584.18KB 共19页
简 介:
SCLS039F DECEMBER 1982 REVISED SEPTEMBER 2003 SN54HC590A, SN74HC590A 8BIT BINARY COUNTERS WITH 3STATE OUTPUT REGISTERS D 2-V to 6-V VCC Operation D High-Current 3-State Parallel Register D D Outputs Can Drive Up To 15 LSTTL Loads Low Power Consumption, 80-A Max ICC Typical tpd = 14 ns SN54HC590A . . . J OR W PACKAGE SN74HC590A . . . D, DW, OR N PACKAGE (TOP VIEW) D D D D ±6-mA Output Drive at 5 V Low Input Current of 1 A Max 8-Bit Counter With Register Counter Has Direct Clear SN54HC590A . . . FK PACKAGE (TOP VIEW) QH NC No internal connection description/ordering information 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. ORDERING INFORMATION TA PACKAGE PDIP N Tube of 25 Tube of 40 40°C to……
