1

8

2

7

3

6

4

5

NC

Q

NC

V

CC

D

D

GND

V

BB

LVPECL

LVTTL

+

+

+

SN65EPT21

www.ti.com

SLLS970 – NOVEMBER 2009

3.3-V Differential PECL/LVDS to TTL Translator

Check for Samples: SN65EPT21

1

FEATURES

PIN ASSIGNMENT(Add pullup on BOTH

•

1 ns Propagation Delay

inputs)

•

Fmax > 300MHz

•

Operating Range: VCC = 3.0 V to 3.6 V with

D or DGK PACKAGE

(TOP VIEW)

GND = 0 V

•

24-mA TTL Output

•

Built-In Temperature Compensation

•

Drop-In Compatible to the MC10EPT21,

MC100EPT21

APPLICATIONS

•

Data and Clock Transmission Over Backplane

•

Signaling Level Conversion for Clock or Data

DESCRIPTION

The

SN65EPT21

is

a

differential

PECL-to-TTL

translator. It operates on +3.3 V supply and ground

only. The device includes circuitry to maintain inputs

Table 1. Pin Descriptions

at Vcc/2 when left open.

PIN

FUNCTION

The VBB pin is a reference voltage output for the

Q

LVTTL/LVCMOS Output

device. When the device is used in single-ended

D, D

Differential LVPECL/LVDS/CML Input

mode, the unused input should be tied to VBB. This

VCC

Positive Supply

reference voltage can also be used to bias the input

VBB

Output Reference Voltage

when it is ac coupled. When it is used, place a

0.01

μF decoupling capacitor between VCC and VBB.

GND

Ground

Also limit the sink/source current to < 0.5 mA to VBB.

NC

No Connect

Leave VBB open when it is not used.

EP

(DFN8 only) Thermal exposed pad must be

connected to a sufficient thermal conduit.

The SN65EPT21 is housed in an industry standard

Electrically connect to the most negative supply

SOIC-8 package and is also available in an optional

(GND) or leave unconnected, floating open.

TSSOP-8 package.

ORDERING INFORMATION(1)

PART NUMBER

PART MARKING

PACKAGE

LEAD FINISH

SN65EPT21D/DR

EPT21

SOIC

NiPdAu

SN65EPT21DGK/DGKR

SSSI

MSOP

NiPdAu

(1)

Leaded device options are not initially available; contact a sales representative for further details.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.