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參數(shù)資料
| 型號(hào)： | AN1672D |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | The ECL Translator Guide |
| 中文描述： | 翻譯的ECL指南 |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 64K |
| 代理商： | AN1672D |
AN1672/D
http://onsemi.com
6
From LVPECL to LVTTL/LVCMOS
Devices MC100EPT21, MC100EPT23, MC100LVELT23,
and MC100EPT26 translate LVPECL signals to
LVTTL/LVCMOS. Standard levels for the LVTTL and
LVCMOS are the same.
There are no “open input” default circuits to force the
outputs to a determined state. Provisions should be taken to
prevent autooscillation. If the inputs are permitted to
converged on the same voltage (within the V
IHCMR
range),
or merely left floating, autooscillation will initiate.
There are no powerup sequence requirements or power
sequence restrictions. If either V
CC
or V
EE
supplies are not
present, such as during an open pin condition, the output
falls to near zero without harm or damage to the device.
Outputs of these devices typically display about 2X the
required data sheet drive. For example, at V
OLmin
the drive
is required to sink 24 mA and will typically sink >50 mA. At
V
OH
, the spec drive is 3.0 mA and will typically source
>8 mA.
Typical drive current strength of the TTL output is shown
in the following two tables, Table 7 and Table 8, and their
graphs, Figure 3 and Figure 4.
Typical EPT TTL series output impedance in the HIGH state is about 5 . In the LOW state output impedance is about 15 .AC
measurements are made to the 1.5 V point for the AC characteristics such as t
pd
and skew.
Table 7. EPT TTL Series Drive LOW Current (I
OL
) vs
Voltage (V
OL
) at 25 C
I
out
V
out
0.004
0.022
0.020
0.104
0.039
0.200
0.058
0.295
0.082
0.415
0.118
0.596
0.158
0.800
0.1963
1.000
Table 8. EPT Series TTL Drive HIGH Current (I
OH
) vs
Voltage (V
OH
) at 25 C
I
out
V
out
0.0146
2.32
0.0112
2.36
0.0081
2.40
0.0052
2.44
0.0028
2.48
0.0011
2.52
0.0003
2.56
Figure 3. EPT TTL Series Drive LOW Current (I
OL
)
versus Voltage (V
OL
) at 25 C
0.2
0.4
0.6
0
0.8
1
V
OL
(V)
I
O
0
0.04
0.08
0.20
0.12
0.16
25
°
C
Figure 4. EPT Series TTL Drive HIGH Current (I
OH
)
versus Voltage (V
OH
)
2.32
2.36
2.4
V
OH
(V)
2.44
2.3
2.48
2.52
2.56
I
O
0
0.004
0.008
0.016
0.012
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