SN74ALVCH16721DLR集成电路（IC）的触发器规格书PDF中文资料

SN74ALVCH16721DLR属于集成电路（IC）的触发器。由德州仪器制造生产的SN74ALVCH16721DLR触发器触发器是能够存储单个逻辑状态或信息“位”的基本数字存储器件。这些器件至少有两个输入；一个或多个用于传递要存储的数据，另一个用于指示存储该数据的时间点。不同的触发器类型，例如 D（延迟）、SR（置位复位）和 JK，对提供给其输入的信号有不同的响应，可用于实现不同的逻辑功能。这些器件与锁存器的不同之处在于它们是边缘敏感器件，其保持的逻辑状态仅在接收到有效时钟信号时才会改变。

FEATURES

· Member of the Texas Instruments Widebus™

Family

· EPIC™ (Enhanced-Performance Implanted

CMOS) Submicron Process

· ESD Protection Exceeds 2000 V Per

MIL-STD-883, Method 3015; Exceeds 200 V

Using Machine Model (C = 200 pF, R = 0)

· Latch-Up Performance Exceeds 250 mA Per

JESD 17

· Bus Hold on Data Inputs Eliminates the Need

for External Pullup/Pulldown Resistors

· Package Options Include Plastic 300-mil

Shrink Small-Outline (DL), Thin Shrink

Small-Outline (DGG), and Thin Very

Small-Outline (DGV) Packages

DESCRIPTION

This 20-bit flip-flop is designed specifically for 1.65-V

to 3.6-V VCC operation.

The 20 flip-flops of the SN74ALVCH16721 are

edge-triggered D-type flip-flops with qualified clock

storage. On the positive transition of the clock (CLK)

input, the device provides true data at the Q outputs if

the clock-enable (CLKEN) input is low. If CLKEN is

high, no data is stored.

A buffered output-enable (OE) input places the 20

outputs in either a normal logic state (high or low) or

the high-impedance state. In the high-impedance

state, the outputs neither load nor drive the bus lines

significantly. The high-impedance state and increased

drive provide the capability to drive bus lines without

need for interface or pullup components. OE does not

affect the internal operation of the flip-flops. Old data

can be retained or new data can be entered while the

outputs are in the high-impedance state.

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN74ALVCH16721 is characterized for operation from -40°C to 85°C.