SY100EL90V_06 Datasheet, PDF (1/5 Pages) Micrel Semiconductor – 5V/3.3V TRIPLE ECL/LVECL-TOPECL/LVPECL TRANSLATOR

Micrel, Inc.
5V/3.3V TRIPLE ECL/LVECL-TO-
PECL/LVPECL TRANSLATOR
SY100EL90V
SY100EL90V
FEATURES
s 3.3V and 5V power supply options
s 500ps propagation delay
s Fully differential design
s Supports both standard and low voltage operation
s Available in 20-pin SOIC package
DESCRIPTION
The SY100EL90V is a triple ECL/LVECL-to-PECL/
LVPECL translator. The device can translate over all
combinations of supply voltages: -5V ECL to 5V PECL,
-5V ECL to 3.3V LVPECL, -3.3V LVECL to 5V PECL or
-3.3V LVECL to 3.3V LVPECL.
A VBB output is provided for interfacing with single
ended ECL signals at the input. If a single ended input is
to be used, the VBB output should be connected to the D
input. The active signal would then drive the D input.
When used, the VBB output should be bypassed to via a
0.01µF capacitor. The VBB output is designed to act as
the switching reference for the EL90V under single ended
input switching conditions. As a result this pin can only
source/sink up to 0.5mA of current.
To accomplish the level translation the EL90V requires
three power rails. The VCC supply should be connected
to the positive supply, and the VEE pin should be
connected to the negative power supply. The GND pins
as expected are connected to the system ground plane.
Both VEE and VCC should be bypassed to ground via
0.01µF capacitors.
Under open input conditions, the D input will be biased
at VCC/2 and the D input will be pulled to VEE. This
condition will force the Q output to a LOW, ensuring
stability.
FUNCTION TABLE
Function
–5V ECL to 5V PECL
–5V ECL to 3.3V LVPECL
–3.3V LVECL to 5V PECL
–3.3V LVECL to 3.3V LVPECL
VCC
5V
3.3V
5V
3.3V
GND
0V
0V
0V
0V
VEE
–5V
–5V
–3.3V
–3.3V
PIN NAMES
Pin
Dn
Qn
VBB
Function
ECL/LVECL Inputs
PECL/LVPECL Outputs
ECL/LVECL Reference Voltage Output
M9999-031306
[e-mail] or [phone]
11
Rev.: I
Amendment: /0
Isse Date: March 2006