Datasheet

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
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FEATURES
PIN ASSIGNMENT(Add pullup on BOTH
• 1 ns Propagation Delay
inputs)
• F
max
> 300MHz
• Operating Range: V
CC
= 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 V
BB
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 V
BB
. This
V
CC
Positive Supply
reference voltage can also be used to bias the input
V
BB
Output Reference Voltage
when it is ac coupled. When it is used, place a
0.01μF decoupling capacitor between V
CC
and V
BB
. GND Ground
Also limit the sink/source current to < 0.5 mA to V
BB
.
NC No Connect
Leave V
BB
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.
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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.