MICREL SY10ELT21L, SY100ELT21L Datasheet
3.3V DIFFERENTIAL
LVPECL-to-LVTTL
TRANSLATOR
ClockWorks™
SY10ELT21L
SY100ELT21L
FEATURES
■ 3.3V power supply
■ 2.0ns typical propagation delay
■ Low power
■ Differential LVPECL inputs
■ 24mA TTL outputs
■ Flow-through pinouts
■ Available in 8-pin SOIC package
PIN CONFIGURATION/BLOCK DIAGRAM
DESCRIPTION
The SY10/100ELT21L are single differential LVPECLto-LVTTL translators using a single +3.3V power supply.
Because LVPECL (Low Voltage Positive ECL) levels are
used, only +3.3V and ground are required. The small
outline 8-lead SOIC package and low skew single gate
design make the ELT21L ideal for applications that require
the translation of a clock or data signal where minimal
space, low power, and low cost are critical.
VBB allows a differential, single-ended, or AC-coupled
interface to the device. If used, the VBB output should be
bypassed to VCC with 0.01µF capacitor.
Under open input conditions, the /D will be biased at a
VCC/2 voltage level and the D input will be pulled to
ground. This condition will force the Q output low to
provide added stability.
The ELT21L 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
1NC
2
D
PECL
3
D
4
V
BB
TTL
8V
CC
Q
7
NC
6
GND
5
Q TTL Output
D, /D Differential LVPECL Inputs
V
CC
V
BB
GND Ground
+3.3V Supply
Reference Output
Rev.: B Amendment: /0
1
Issue Date:
April 2000
Micrel
ClockWorks™
SY10ELT21L
SY100ELT21L
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol Paramter Value Unit
V
CC
V
I
V
O
I
O
T
store
T
A
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.
Power Supply Voltage –0.5 to +3.8 V
PECL Input Voltage 0V to VCC+0.5 V
Voltage Applied to –0.5 to V
Output at HIGH State
CC
V
Current Applied to Twice the mA
Output at LOW State Rated I
OL
Storage Temperature –65 to +150 °C
Operating Temperature –40 to +85 °C
TTL DC ELECTRICAL CHARACTERISTICS
VCC = +3.3V ±5%
TRUTH TABLE
D/D Q
LH L
HL H
Open Open L
TA = –40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Max. Min. Max. Min. Typ. Max. Min. Max. Unit Condition
I
OS
I
CC
V
OH
V
OL
Output Short Circuit Current –80 –275 –80 –275 –80 — –275 –80 –275 mA V
OUT
= 0V
Power Supply Current — 20 — 20 — 14 20 — 20 mA
Output HIGH Voltage 2.0 — 2.0 — 2.0 — — 2.0 — V IOH = –3.0mA
Output LOW Voltage — 0.5 — 0.5 — — 0.5 — 0.5 V IOL = 24mA
PECL DC ELECTRICAL CHARACTERISTICS
VCC = +3.3V ±5%
TA = –40°CTA = 0°CTA = +25°CTA = +85°C
Symbol Parameter Min. Max. Min. Max. Min. Typ. Max. Min. Max. Unit Condition
I
IH
I
IL
V
IH
V
IL
V
BB
NOTES:
1. These values are for VCC = 3.3V. Level Specifications will vary 1:1 VCC.
Input HIGH Current — 150 — 150 — — 150 — 150 µA
Input LOW Current D 0.5 — 0.5 — 0.5 — — 0.5 — µA
/D –300 — –300 — –300 — — –300 —
Input HIGH Voltage
(2)
10ELT 2070 2410 2130 2460 2170 — 2490 2240 2580 mV
100ELT 2135 2420 2135 2420 2135 — 2420 2135 2420
Input LOW Voltage
(2)
10ELT 1350 1800 1350 1820 1350 — 1820 1350 1855 mV
100ELT 1490 1825 1490 1825 1490 — 1825 1490 1825
Reference Output
(2)
10ELT 1870 2000 1920 2030 1950 2000 2050 1990 2110 mV
100ELT 1920 2040 1920 2040 1920 1980 2040 1920 2040
2
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