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DU AL TTL-to-DIFFERENTIAL
PECL TRANSLA TOR
SY10ELT22
SY100ELT22
FEATURES
■ 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 SY10/100ELT22 are dual TTL-to-differential PECL
translators. Because PECL (Positive ECL) levels are
used, only +5V and ground are required. The small outline
8-lead SOIC package and the low skew, dual gate design
of the ELT22 makes it ideal for applications which require
the tranlation of a clock and a data signal.
The ELT22 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 +5.0V Supply
GND Ground
Q1
4
SOIC
TOP VIEW
5
GND
Rev.: F Amendment: /0
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Issue Date: January, 1999
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Micrel
SY10ELT22
SY100ELT22
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 = VCC (Min.) to VCC (Max.)
TRUTH TABLE
DQ Q
HH L
LL H
Open H L
TA = -40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit Condition
CC Power Supply Current — 30 — 30 — 30 — 30 mA —
I
NOTE:
1. Parametric values specified at: 5 volt Power Supply Range 100ELT22 Series: +4.2V to +5.5V.
10ELT22 Series +4.75V to +5.5V.
AC ELECTRICAL CHARACTERISTICS
(1)
VCC = VCC (Min.) to VCC (Max.)
TA = -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
NOTE:
1. Parametric values specified at: 5 volt Power Supply Range 100ELT22 Series: +4.2V to +5.5V.
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
10ELT22 Series +4.75V to +5.5V.
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Micrel
SY10ELT22
SY100ELT22
TTL DC ELECTRICAL CHARACTERISTICS
(1)
VCC = VCC (Min.) to VCC (Max.)
A = -40°CTA = 0°CTA = +25°CTA = +85°C
T
Symbol Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit Condition
VIH Input HIGH Voltage 2.0 — 2.0 — 2.0 — 2.0 — V —
VIL Input LOW Voltage — 0.8 — 0.8 — 0.8 — 0.8 V —
IH Input HIGH Current — 20 — 20 — 20 — 20 µAVIN = 2.7V
I
—100—100—100—100 VIN = VCC
IIL Input LOW Current — –0.2 — –0.2 — –0.2 — –0.2 mA VIN = 0.5V
V
IK Input Clamp Voltage — –1.2 — –1.2 — –1.2 — –1.2 V IIN = –18mA
NOTE:
1. Parametric values specified at: 5 volt Power Supply Range 100ELT22 Series: +4.2V to +5.5V.
10ELT22 Series +4.75V to +5.5V.
PECL DC ELECTRICAL CHARACTERISTICS
(1)
VCC = VCC (Min.) to VCC (Max.)
TA = -40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Unit
VOH Output HIGH Voltage
V
OL Output LOW Voltage
NOTES:
1. Parametric values specified at: 5 volt Power Supply Range 100ELT22 Series: +4.2V to +5.5V.
2. These values are for VCC = 5.0V. Level Specifications will vary 1:1 with VCC.
(2)
10ELT 3920 — 4110 3980 — 4160 4020 — 4190 4090 — 4280
100ELT 3915 — 4120 3975 — 4120 3975 — 4120 3975 — 4120
(2)
10ELT 3050 — 3350 3050 — 3370 3050 — 3370 3050 — 3405
100ELT 3170 — 3445 3190 — 3380 3190 — 3380 3190 — 3380
10ELT22 Series +4.75V to +5.5V.
mV
mV
PRODUCT ORDERING CODE
Ordering Package Operating VCC Range
Code Type Range (V)
SY10ELT22ZC Z8-1 Commercial +4.75 to +5.5
SY10ELT22ZCTR Z8-1 Commercial +4.75 to +5.5
SY100ELT22ZC Z8-1 Commercial +4.2 to +5.5
SY100ELT22ZCTR Z8-1 Commercial +4.2 to +5.5
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Micrel
8 LEAD SOIC .150" WIDE (Z8-1)
SY10ELT22
SY100ELT22
Rev. 03
MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA
TEL + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
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