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參數(shù)資料
| 型號(hào)： | AND8090D |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | AC Characteristics of ECL Devices |
| 中文描述： | 交流特性的ECL裝置 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 896K |
| 代理商： | AND8090D |
AND8090/D
http://onsemi.com
8
Differential Input Example
– The relationship between
V
PP
and V
IHCMR
is used to completely define valid
differential input signals. The following MC100EP116
example is for the 5.0 V PECL mode (V
CC
= 5.0 V, V
EE
=
GND), and illustrates the valid input voltages for an
application which uses the minimum and maximum input
voltage swings for the device. Note that both the V
PP
and the
V
IHCMR
conditions are satisfied for each of the two
waveforms.
VIHCMR(min)
2.0 V
VIH
VIHCMR(max)
5.0 V
VPP(min)
The top waveform in Figure 15 represents the highest
possible LOW input value where:
150 mV
VPP
VPP(max)
1200 mV
VIL(max)
The bottom waveform in Figure 15 represents the lowest
possible LOW input value where:
VIH(max)
VPP(min)
5.0
0.15
4.85 V
VIL(min)
VIH(min)
VPP(max)
2.0
1.2
0.80 V
Figure 15. MC100EP116 Differential Input Voltage
5.0 V
4.8 V
3.0 V
2.0 V
1.0 V
V
IH
= 5.0 V
V
PP
= 0.15 V
V
IL
= 4.85 V
V
IHCMR(min)
V
IHCMR(max)
V
PP
= 1.2 V
V
IH
= 2.0 V
V
IL
= 0.8 V
D
D
D
D
SINGLEENDED CHARACTERISTICS
Section Note
– This section explains concepts that only
apply to singleended inputs and/or outputs.
SingleEnded Inputs
– Many inputs/outputs are
singleended instead of differential, i.e. they have a single
input/output instead of a pair of true and inverted
inputs/outputs.
SingleEnded 50% Points
– Singleended 50% points
are used as a measurement point for singleended input and
output signals. A 50% point is the singleended signal level
which lies halfway between the HIGH and LOW
input/output levels as shown in Figure 16.
Figure 16. SingleEnded Input/Output 50% Point
V
IH
or V
OH
V
IL
or V
OL
50%
Note from the following MC100EP116 calculations for
the 5.0 V PECL mode that the 50% point voltage is not a
fixed voltage. The 50% point varies with the input voltage
range.
50% Point(max)
[VIH(max)
(4120
VIL(max)] 2
3375) 2
3748 mV
50% Point(min)
[VIH(min)
(3775
VIL(min)] 2
3190) 2
3483 mV
SingleEnded Input Voltage Range
– Singleended
input HIGH and LOW levels have a boundary and a
threshold as shown in Figure 17. Once an input crosses a
logic threshold, the logic state is guaranteed to change to the
new state.
Figure 17. SingleEnded Input Logic Levels
V
IHmax
HIGH
V
IHmin
V
ILmax
LOW
V
ILmin
Boundary
Threshold
Threshold
Boundary
The MC100EP116 example shown in Figure 18 is for the
5.0 V PECL mode.
Figure 18. MC100EP116 SingleEnded Input Example
V
IHmax
HIGH
V
IHmin
V
ILmax
LOW
V
ILmin
4120 mV
3775 mV
3375 mV
3190 mV
SingleEnded Input Test Level
– The AC test
singleended input swing is typically given by the following
equation:
VIN(swing)
|VIH
VIL|
750 mV
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