MICREL SY100ELT982 Datasheet
PECL-TO-CML
TRANSLATOR
w/o ENABLE
PRELIMINARY
SY100ELT982
FEATURES
■ Up to 1.25Gbps operation
■ 25mA peak drive current
■ Adjustable output current
■ Separate output enable
■ Differential inputs for data
■ 75KΩ input pulldown resistor
■ Single power supply
■ Available in a tiny 10-pin (3mm) MSOP
PIN CONFIGURATIONS
V
/EN
D
/D
REF
SET
1
2
IN
3
IN
4
5
MSOP
K10-1
10
V
9
/OUT
8
OUT
7
GND
GNDR
6
CC
DESCRIPTION
The SY100ELT982 is a high speed PECL-to-CML
translator. The output current is DC current controlled by
IRSET, current through the resistor RSET. The output OUT
is LOW when output enable is HIGH.
The device incorporates complementary open collector
outputs with a capability of driving peak current of 25mA.
The SY100ELT982 utilizes the high performance
bipolar ASSET™ technology.
APPLICATIONS
■ Telecommunications
■ CML Output Oscillator
■ GaAS Interface
BLOCK DIAGRAM
D
D
EN
V
CC
R
TERM
OUT
IN
IN
Internal Logic
I
OUT
OUT
BIAS
V
REF
Control
Output Current
Control
R
SET
40X
V
CC
GND
V
EE
SET
R
Rev.: A Amendment: /1
1
Issue Date: July 2000
Micrel
PRELIMINARY
SY100ELT982
PIN NAMES TRUTH TABLE
Pin Function
V
CC Most positive power supply input, +5V for PECL
operation.
GND Ground
DIN, /DIN Differential PECL 100K compatible inputs.
/EN This PECL 100K compatible input enables data
translation. When Enable asserted HIGH,
OUT = IOUT, /OUT = 0mA.
OUT, /OUT Open collector outputs from the output
buffer drive these differential current outputs.
VREF Voltage reference for use with RSET.
RSET External resistor to adjust output current.
ABSOLUTE MAXIMUM RATINGS
(1)
D /D /EN OUT
LHLLH
HLLHL
XXHLH
NOTE:
1. L = LOW, H = HIGH, X = don't care
2. H = IOUT = 0mA
3. H = /I
OUT = 0mA
(1)
(2)
/OUT
(3)
Symbol Rating Value Unit
VCC Power Supply Voltage 0 to +7.0 V
VI Input Voltage 0 to +6.0 V
IO Output Current 25 mA
TA Operating Temperature Range 0˚C to +85˚C ˚C
Tstore Storage Temperature Range –55˚C to +125˚C ˚C
tot Power Dissipation 250 mW
P
NOTE:
1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied
at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATlNG conditions for extended
periods may affect device reliability.
OPERATIONING CONDITIONS
(1)
Symbol Rating Value Unit
VCC Power Supply Voltage +4.5 to +5.5 V
RTERM Resistor to Terminate Outputs 10 to 50 Ω
RSET Resistor to Adjust Current 1500 to 50,000 Ω
ΘJA Thermal Resistance of Package to Ambient
OUT Capacitance on OUT + /OUT 2.5 typical pf
C
NOTES:
1. The voltage drop across RTERM should not be greater than 2V.
2. Still air without heatsink.
(2)
206 ˚C/W
2
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