SN65ELT21
www.ti.com. SLLS923 – JUNE 2009 5-V PECL-to-TTL Translator
FEATURES 1 3ns (TYP) Propagation Delay
Operating Range: VCC = 4.2 V to 5.7 V with
GND = 0 V
24-mA TTL Output
Deterministic Output Value for Open Input
Conditions or When Inputs < 1.3 V
Built-In Temperature Compensation
Drop-In Compatible to the MC10ELT21,
MC100ELT21 PIN ASSIGNMENT
D or DGK PACKAGE
(TOP VIEW) APPLICATIONS Data and Clock Transmission Over Backplane
Signaling Level Conversion for Clock or Data NC 1 8 VCC D 2 7 Q D 3 6 NC VBB 4 5 GND DESCRIPTION
The SN65ELT21 is a differential PECL-to-TTL
translator. It operates on +5-V supply and ground
only. The device includes circuitry to maintain Q to a
low logic level when inputs are in an open condition
or < 1.3 V.
The VBB pin is a reference voltage output for the
device. When the device is used in single-ended
mode, the unused input should be tied to VBB. This
reference voltage can also be used to bias the input …
