The 74HC/HCT4514 are 4-to-16 line decoders/demultiplexers having four binary weighted address inputs (A0 to A3), with latches, a latch enable input (LE), and an active LOW enable input (E). The 16 outputs (Q0 to
While the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is taken low, the Q outputs are latched at the logic levels at the D inputs. A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state...
While the latch enable (LD) is low, the latches are enabled to store the BCD inputs. When the latch enable is high, the latches are disabled, making the outputs transparent to the BCD inputs. The device has an active-high blanking input (BI) and a phase input (PH) to which a ...
好好检查一下testbench是不是没有触发count的复位。module counters(clk,reset,enable,done);input clk;input reset; //low is active,asynchronousinput enable; //high is activeoutput wire done;reg [2:0] count;assign done=((count==7)&enable);always @(posedge clk or negedge reset...
74HC573D-Q100 - The 74HC573-Q100; 74HCT573-Q100 is an 8-bit D-type transparent latch with 3-state outputs. The device features latch enable (LE) and output enable (OE) inputs. When LE is HIGH, data at the inputs enter the latches. In this condition the l
When the STROBE input is held high, data propagates through the latch to a 3-state output buffer. This buffer is enabled when OUTPUT ENABLE input is taken high. All inputs are equipped with protection circuits against static discharge and transient excess volta...
Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide Pin Description Names A0–A3 Address (Data Inputs)LE Latch Enable Input (Active LOW)RBI Ripple Blanking Input (Active LOW)RBO Ripple Blanking as Output (Active LOW)as Input (Active LOW)a –g Constant Current Outputs (Active LOW)
The latch remains transparent to the data input while E is HIGH, and stores the data that is present one set-up time before the HIGH-to-LOW enable transition. The 3-State output buffers are designed to drive heavily loaded 3-State buses, MOS memories, or MOS microprocessors. The active-...
It is ideal for low power and very high speed 1.8 to 3.6 V applications; it can be interfaced to 3.6 V signal environment for both inputs and outputs. These 16 bit d-type flip-flops are controlled by two clock inputs (nCK) and two output enable inputs (nOE). On the positive ...
inputs. The inputs of these flip-flops represent the scan inputs of the multiplexers. The latch has an active-high enable, which becomes transparent only when clk1 goes low and effectively adds a half clock of hold time to the output of flip-flop 1. In this figure, you assume that ...