器件名称:
74HC595
功能描述:
8-Bit Shift Registers W ith Latched 3-State Output
文件大小:
251.37KB 共8页
简 介:
74HC595 GENERAL DESCRIPTION 8-Bit Shift Registers W ith Latched 3-State Output 74HC595 is fabricated with high-speed silicon gate CMOS technology. It contains an 8-bit serial-in, serial or parallel-out shift register and an 8-bit D-type storage register with parallel 3-state outputs. The shift and storage register have independent clock inputs. Both the shift register clock (SRCK) and storage register clock (RCK) are positive-edge triggered. The shift register has a direct overriding clear input (SRCL), serial data input (SER), and serial outputs for cascading. When the output-enable (OE) input is high, the outputs are in the high-impedance state. If both clocks are connected together, the shift register always is one clock pulse ahead of the storage register. FEATURES 8-bit serial-in, parallel-out shift register with storage Shift register has direct clear 8-bit D-type storage register with parallel 3-state outputs Two independent clocks for shift and storage register Wide operating power supply voltage 2-6V Low input current < 1A Low power consumption, Max. 80A (74HC595) Output driving capacity ± 6 mA at 5V Typical propagation delay 13nS LOGIC DIAGRAM Q1 15 Q2 1 Q3 2 Q4 3 Q5 4 Q6 5 Q7 6 Q8 7 13 OE 3R C3 3S 3R C3 3S 3R C3 3S 3R C3 3S 3R C3 3S 3R C3 3S 3R C3 3S 3R C3 3S 12 RCK 11 SRCK 14 SER 10 1D C1 R 2S 2R C2 R 2S 2R C2 R 2S 2R C2 R 2S 2R C2 R 2S 2R C2 R 2S 2R C2 R 2S 2R C2 R 9 Q8’ SRCL 1 WS74HC595 FUNCTIONAL DESCRIPTION 1. ……
