AND8066 Datasheet, PDF (5/8 Pages) ON Semiconductor – Interfacing with ECLinPS

–0.8
–1.0
–1.2
85°C
–1.4
25°C
–30°
C
–1.6
–1.8
AND8066/D
–0.8
–1.0
–1.2
70°C 25°C 0°C
–1.4
–1.6
–1.8
–2.0 –1.8 –1.6 –1.4 –1.2 –1.0 –0.8
V_in, (RELATIVE TO V_CC)
Figure 15. 10K Series Vin vs. Vout Transfer Curves
–2.0
–1.8 –1.6 –1.4 –1.2
V_in, (RELATIVE TO V_CC)
–1.0
–0.8
Figure 16. 10KH Series Vin vs. Vout Transfer Curves
The difference in the DC behavior of the inputs and outputs
of the two different standards necessitates caution when
mixing the two technologies in single–ended designs. Output
levels become critical to the receiver when the V_OH minimum,
V_OHA, drives into the receiver as the V_IH minimum. Levels are
also critical when the driver V_OL maximum, V_OLA, drives into
the receiver as the V_IL maximum.
V_OH(max)
V_IH(max)
V_OH(min)
V_OHA
V_OL(max)
V_OLA
V_IH(min)
V_IL(max)
V_OL(min)
V_IH(min)
Figure 17. Single–Ended Noise Margin
Noise margin quantifies the susceptibility of a driver and
receiver interface to any non–signal voltage levels and
therefore risking false switching. Two measurements –
NOISE MARGIN HIGH and NOISE MARGIN LOW –
describe the false switching risk across temperature as
follows:
NOISE MARGIN_(HIGH) = V_OH(min) – V_IH(min)
NOISE MARGIN_(LOW) = V_OL(max) – V_IL(max)
An MC10EP16DT, operating in LVPECL mode with 3.3 V
on V_CC and 0.0 V on V_EE, interfaced to an MC10EP16DT
receiver, single–ended, has a noise margin at the specification
ambient temperature shown in Table 1. Notice the safety
margin levels are positive for NOISE MARGIN HIGH
indicating the driver exceeds the receiver’s requirement for a
minimum and the delta is positive. For a NOISE MARGIN
LOW, the driver must be below the receiver’s maximum and
the delta is negative.
Table 1. Noise Margins: MC10EP16DT Interfaced to
an MC10EP16DT Receiver
10 to 10 Noise
Margin HIGH
Temp.
V_OH(min) –
V_IH(min)
Delta
(mV)
–40°C
2165 – 2090
75
25°C
2230 – 2155
75
85°C
2290 – 2215
75
10 to 10 Noise
Margin LOW
Temp.
–40 °C
V_OL(max) –
V_IL(max)
1615 – 1690
Delta
(mV)
–40
25°C
1680 – 1755
–75
85°C
1740 – 1810
–70
When a 10 Series device drives a 100 Series device
single–ended, the noise margins become a risk factor requiring
careful evaluation as indicated in Table 2.
Table 2. Noise Margins: MC10EP16DT Interfaced to
an MC100EP16DT Receiver
10 to 100 Noise
Margin HIGH
Temp.
–40°C
25°C
85°C
V_OH(min) – V_IH(min)
2165 – 2075
2230 – 2075
2290 – 2075
Delta
(mV)
90
155
215
10 to 100 Noise
Margin LOW
Temp.
–40 °C
25°C
85°C
V_OL(max) – V_IL(max)
1615 – 1675
1680 – 1675
1740 – 1675
Delta
(mV)
–60
5
65
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