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AN-784

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品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		/
页数	文件大小	规格书
6页	79K
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F100K ECL Dual Rail Translators

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Fairchild Semiconductor

Application Note

AN-784

June 1991

Revised February 2004

F100K ECL Dual Rail Translators

INTRODUCTION

these devices, unidirectional translation is possible in either

direction (TTL to ECL with the 100324, ECL to TTL with the

100325). As systems and data widths become larger, more

bits need to be translated. This need was satisfied with the

introduction of 8- and 9-bit translators. The 8-bit translator

(100329) also offer bidirectional translation functionality for

applications which require two way communication. In

many cases, communication over significant distances is

needed in noisy environments. In applications where high

output drive is needed after an ECL to TTL translation the

9-bit 100395 can be used. The 64 mA I_OLoutput current

The complex electronic systems being designed today

often require mixed technologies to incorporate the most

efficient balance of performance, speed, power, and cost.

In order for one technology to communicate with the other,

an interface is needed. One of the most common mix of

technologies seen today is high speed ECL with the slower,

but very popular TTL and CMOS. To make this interface as

quick and clean as possible, level translators are used.

This applications note will discuss ECL to TTL and TTL to

ECL level translators available from Fairchild Semiconduc-

tor’s F100K ECL 300 Series product line. Focus will be on

Dual Rail Translators (translators which require both ECL

and TTL power supplies for normal operation), their differ-

entiating features and possible uses.

capability is ideal for driving long lines and achieving faster

switching times by discharging the line it is tied to faster

when in the LOW output state. These outputs are also

capable of driving higher fanouts than the lower output cur-

rent devices.

TRANSLATOR SELECTION

If the designer only has a +5V supply available (i.e., An

additional ECL supply cannot be used), single rail transla-

tors can be used. For more information on single rail trans-

lation refer to applications note AN-780 “Operating ECL

From a Single Positive Supply”.

Fairchild Semiconductor offers translators of all different

types. Table 1 shows the TTL to ECL and ECL to TTL

translators that are presently available. The first 300 Series

translators designed were the 100324 and 100325. With

TABLE 1. 300 Series Dual Rail Translators

100324 100325

Features

100329

100395

Data Bits

ECL to TTL

TTL to ECL

Latched

Registered

ECL Differential

ECL Drive (Ohms)

ECL Cutoff

OUT

IN (Note 1)

TTL Drive

_OL/I_OH(mA)

20/−2

24/−3

64/−15

TTL 3-STATE

ECL Control Pins

TTL Control Pins

TPD ECL to TTL (ns Max)

TPD TTL to ECL (ns Max)

4.8

7.7

3.9

6.4

3.0

−70

I_EE(mA Max)

_CC(mA Max)

−37

−199

−67

Note 1: V_BBoutput available for 100325

MECL is a trademark of Motorola, Inc.

AN010938

www.fairchildsemi.com

12 3 4 5 6

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AN78L05ME1	PANASONIC	获取价格	3-pin positive output voltage regulator (100 mA type)
AN78L06	PANASONIC	获取价格	3-pin positive output voltage regulator (100 mA type)
AN78L06M	PANASONIC	获取价格	3-pin positive output voltage regulator (100 mA type)

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