MICREL SY10ELT22L, SY100ELT22L Datasheet
3.3V DUAL
TTL-to-DIFFERENTIAL
PECL TRANSLA TOR
SY10ELT22L
SY100ELT22L
FEATURES
■ 3.3V power supply
■ 300ps typical propagation delay
■ <100ps output-to-output skew
■ Differential PECL outputs
■ PNP TTL inputs for minimal loading
■ Flow-through pinouts
■ Available in 8-pin SOIC package
PIN CONFIGURATION/BLOCK DIAGRAM
Q0
Q0
Q1
1
2
PECL TTL
3
8
VCC
7
D0
6
1
D
DESCRIPTION
The SY10/100ELT22L are dual TTL-to-differential
PECL translators with +3.3V power supply. Because
PECL (Positive ECL) levels are used, only +3.3V and
ground are required. The small outline 8-lead SOIC
package and the low skew, dual gate design of the
ELT22L makes it ideal for applications which require the
tranlation of a clock and a data signal.
The ELT22L 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 Function
Qn Differential PECL Outputs
Dn TTL Inputs
VCC +3.3V Supply
GND Ground
Q1
4
SOIC
TOP VIEW
5
GND
Rev.: H Amendment: /0
1
Issue Date: March, 1999
Micrel
SY10ELT22L
SY100ELT22L
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol Paramter Value Unit
VCC Power Supply Voltage –0.5 to +7.0 V
VI TTL Input Voltage –0.5 to VCC V
II TTL Input Current –30 to +5.0 mA
OUT PECL Output Current mA
I
— Continuous 50
— Surge 100
Tstore Storage Temperature –65 to +150 °C
amb Operating Temperature –40 to +85 °C
T
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.
DC ELECTRICAL CHARACTERISTICS
(1)
VCC = +3.0V to +3.8V
TRUTH TABLE
DQ Q
HH L
LL H
Open H L
T
A = -40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit Condition
CC Power Supply Current — 25 — 25 — 25 — 25 mA —
I
NOTE:
1. Parametric values specified at: 3 volt Power Supply Range 10/100ELT22L Series: +3.0V to +3.8V.
AC ELECTRICAL CHARACTERISTICS
(1)
VCC = +3.0V to +3.8V
T
A = -40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit Condition
PLH Propagation Delay to Output D, 100 600 100 600 100 600 100 600 ps 50Ω to VCC – 2.0V
t
tPHL ENECL/ENTTL
t
r Output Rise/Fall Time 200 500 200 500 200 500 200 500 ps 50Ω to VCC – 2.0V
tf 20% to 80%
tskpp Part-to-Part Skew
skew Within-Device Skew
t
NOTES:
1. Parametric values specified at: 3 volt Power Supply Range 10/100ELT22L Series: +3.0V to +3.8V.
2. Guaranteed, but not tested.
3. Same transition @common VCC levels.
(2)
(2,3)
— 500 — 500 — 500 — 500 ps 50Ω to VCC – 2.0V
— 100 — 100 — 100 — 100 ps 50Ω to VCC – 2.0V
2
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