SN74ALVCH16721DLR屬于集成電路（IC）的觸發(fā)器。由美國德州儀器公司制造生產(chǎn)的SN74ALVCH16721DLR觸發(fā)器觸發(fā)器是能夠存儲單個邏輯狀態(tài)或信息“位”的基本數(shù)字存儲器件。這些器件至少有兩個輸入；一個或多個用于傳遞要存儲的數(shù)據(jù)，另一個用于指示存儲該數(shù)據(jù)的時間點。不同的觸發(fā)器類型，例如 D（延遲）、SR（置位復(fù)位）和 JK，對提供給其輸入的信號有不同的響應(yīng)，可用于實現(xiàn)不同的邏輯功能。這些器件與鎖存器的不同之處在于它們是邊緣敏感器件，其保持的邏輯狀態(tài)僅在接收到有效時鐘信號時才會改變。

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.