SN74LS109AN屬于集成電路（IC）的觸發(fā)器。由美國(guó)德州儀器公司制造生產(chǎn)的SN74LS109AN觸發(fā)器觸發(fā)器是能夠存儲(chǔ)單個(gè)邏輯狀態(tài)或信息“位”的基本數(shù)字存儲(chǔ)器件。這些器件至少有兩個(gè)輸入；一個(gè)或多個(gè)用于傳遞要存儲(chǔ)的數(shù)據(jù)，另一個(gè)用于指示存儲(chǔ)該數(shù)據(jù)的時(shí)間點(diǎn)。不同的觸發(fā)器類型，例如 D（延遲）、SR（置位復(fù)位）和 JK，對(duì)提供給其輸入的信號(hào)有不同的響應(yīng)，可用于實(shí)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(shí)鐘信號(hào)時(shí)才會(huì)改變。

Package Options Include Plastic “Small

Outline’ Packages, Ceramic Chip Carriers

and Flat Packages, and Plastic and Ceramic

DIPs

Dependable Texas Instruments Quality and

Reliability

description

These devices contain two independent J-K positive-

edge triggered flip-flops. A low level at the preset or

‘clear inputs sets or resets the outputs regardless of the

levels of the other inputs. When preset and clear are in-

active (high), data at the J and K inputs meeting the

setup time requirements are transferred to the outputs

on the positive-going edge of the clock pulse. Clock

triggering occurs at a voltage level and is not directly

related to the rise time of the clock pulse. Following the

hold time interval, data ar the J and K inputs may be

changed without affecting the levels at the outputs.

These versatile flip-flops can perform as toggle flip-flops

by grounding K and tying J high. They also can perform

23 D-type flip-flops if J and K are tied together.

The SN54109 and SNSALS109A are characterized for

operation over the full military temperature range of

—55°C 10 125°C. The SN74109 and SN74LS109A are

characterized for operation from 0°C to 70°C,