Micrel, Inc.
DIFFERENTIAL
PECL-to-TTL
TRANSLATOR
Precison Edge
®
Precision
SY10ELT21
Edge
®
SY100ELT21
SY10ELT21
SY100ELT21
FEATURES
2.5ns typical propagation delay
Low power
Differential PECL inputs
24mA TTL outputs
Flow-through pinouts
Available in 8-pin SOIC package
Precision Edge
®
DESCRIPTION
The SY10/100ELT21 are single differential PECL-to-
TTL translators. Because PECL (Positive ECL) levels are
used, only +5V and ground are required. The small outline
8-lead SOIC package and low skew single gate design
make the ELT21 ideal for applications that require the
translation of a clock or data signal where minimal space,
low power, and low cost are critical.
The V
BB
output allow differential single-ended, or AC-
coupled interface to the device. If used, the V
BB
output
should be bypassed to V
CC
with a 0.01µF capacitor.
The ELT21 is available in both ECL standards: the
10ELT is compatible with positive ECL 10H logic levels,
while the 100ELT is compatible with positive ECL 100K
logic levels.
PIN NAMES
Pin
Q
D, /D
V
CC
V
BB
GND
TTL Output
Differential PECL Inputs
+5.0V Supply
Reference Output
Ground
Function
Precision Edge is a registered trademark of Micrel, Inc.
M9999-031506
hbwhelp@micrel.com or (408) 955-1690
Rev.: C
Amendment: /0
1
Issue Date: March 2006
MICREL [ MICREL SEMICONDUCTOR ]
