SN74AS885DW集成电路（IC）的比较器规格书PDF中文资料

SN74AS885DW属于集成电路（IC）的比较器。由美国德州仪器公司制造生产的SN74AS885DW比较器逻辑比较器系列产品用于根据以数字格式表示的信息比较结果来生成输出；身份型比较器指示两个输入是否相同，幅度型比较器还指示两个输入不相同时哪个较大。它们不同于比较两个模拟输入幅度的器件，后者称为线性比较器且单独分类。

Latchable P-Input Ports With Power-Up

Clear

Choice of Logical or Arithmetic

(Two’s Complement) Comparison

Data and PLE Inputs Utilize pnp Input

Transistors to Reduce dc Loading Effects

Approximately 35% Improvement in

ac Performance Over Schottky TTL While

Performing More Functions

Cascadable to n Bits While Maintaining

High Performance

10% Less Power Than STTL for an 8-Bit

Comparison

Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic

(NT) and Ceramic (JT) 300-mil DIPs

description

These advanced Schottky devices are capable of

performing high-speed arithmetic or logic

comparisons on two 8-bit binary or two’s

complement words. Two fully decoded decisions

about words P and Q are externally available at

two outputs. These devices are fully expandable

to any number of bits without external gates. To

compare words of longer lengths, the P > QOUT

and P < QOUT outputs of a stage handling less

significant bits can be connected to the P > QIN

and P < QIN inputs of the next stage handling

more significant bits. The cascading paths are

implemented with only a two-gate-level delay to

reduce overall comparison times for long words.

Two alternative methods of cascading are shown

in application information.

The latch is transparent when P latch-enable

(PLE) input is high; the P-input port is latched

when PLE is low. This provides the designer with temporary storage for the P-data word. The enable circuitry

is implemented with minimal delay times to enhance performance when cascaded for longer words. The PLE,

P, and Q data inputs utilize pnp input transistors to reduce the low-level current input requirement to typically

–0.25 mA, which minimizes dc loading effects.

The SN54AS885 is characterized for operation over the full military temperature range of –55°C to 125°C. The

SN74AS885 is characterized for operation from 0°C to 70°C.