AND8066 Datasheet, PDF (4/8 Pages) ON Semiconductor – Interfacing with ECLinPS

AND8066/D
• Wide signal interface windows.
• High receiver sensitivity.
• Low EMI emission.
Disadvantages may include:
• Increased board routing real estate.
• Increased system power demand.
ECL 10 and 100 Performance Standards
There currently exist two basic legacy standards for high
performance ECL logic devices.
10 Series (compatible with 10H)
100 Series (compatible with 100K)
Both standards display similar highly compatible output
amplitude swings of about 800 mV_pp over a wide range of
operating conditions and loads. This is due to drivers
enjoying a remaining internal output impedance ranging
from 6 to 8 W in both HIGH and LOW level state levels (see
Figure 12).
0
SLOPE = 6 W – 8 W
–5
150 W
to –2.0 V
–10
–15
–20
–25
25 W
to –2.0 V
100 W
to –2.0 V _{50 W}
to –2.0 V
–30
V_OL
–35
T_A = 25°C
V_OH
–40
–2.0 –1.75 –1.5 –1.25 –1.0 –0.75 –0.5 –0.25 0
OUTPUT VOLTAGE (V)
Figure 12. Outputs vs. Load Drive Characteristics
For loads of 35 ohms or less, outputs may need to be
“ganged” (wire “ANDed”), or specialized 25–W driver
circuits deployed. These specialized drivers ensure reduced
power dissipation and improve long term reliability. Both
standards display similar rise/fall times, propagation delays,
and toggle frequencies.
Differential Interface Between 10 and 100
Standards
When interfacing differentially, the two basic standards
are completely, directly compatible over all operational
conditions. This results from receivers of both standards
exhibiting wide V_IH Common Mode Range and fine
minimum input sensitivity, V_pp. Output temperature
variations associated with 10 Series devices are well within
these receiver input characteristic limitations.
Single–Ended (SE) Interface Between 10 and 100
Standards
Single–Ended (SE) line signal interconnects require
analysis of both the driver output levels, V_OH and V_OL,
across temperature and the receiver input voltage level
limits, V_IH and V_IL, to determine complete interface
compatibility. Although 100 Series standard devices
incorporate a temperature compensation network in the
output driver, some variation may still be observed.
Variation of the driver output levels, V_OH and V_OL, across
temperature is typically present in 10 Series devices.
Device series voltage transfer curves characterize the
input and output behavior function across temperature. This
is shown in Figures 13 through 16 for 10E, 100E, 10K, and
10KH Series. Changes in technology refinements to the 10K
Series led to the 10KH Series with better performance in V_IH
and V_OL as V_in approached V_CC. the 10E Series is similar
to the 10KH Series. Temperature compensation allowed the
development of the 100 Series.
–0.8
–1.0
–1.2
85°C 25°C _0°C
–1.4
–1.6
–1.8
–0.8
–1.0
–1.2
–1.4
–1.6
25°C
–1.8
25°C
–2.0 –1.8 –1.6 –1.4 –1.2 –1.0 –0.8
V_in, (RELATIVE TO V_CC)
Figure 13. 10E Series Vin vs. Vout Transfer Curves
–2.0
–1.8
–1.6 –1.4 –1.2 –1.0
V_in, (RELATIVE TO V_CC)
–0.8
Figure 14. 100E Series Vin vs. Vout Transfer Curves
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