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參數(shù)資料
| 型號(hào)： | AN10145 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Bi-directional low voltage translators |
| 中文描述： | 雙向低電壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 22/24頁 |
| 文件大小： | 325K |
| 代理商： | AN10145 |
22
Answer:
The jumper probably needs to disconnect the 3.3 V side. If the 3.3 V side driver is a push pull type driver it
must be disconnected before the low side resistor jumpers can be effective. If it is open drain (NMOS) then the pull
down jumper would form a resistor divider with the pull up resistor (probably should still disconnect the 3.3 V side),
if the pull-up resistor is a sufficiently high value it will look low. If the driver is strong it will pull the 2.2 k
pull-up
low through the GTL2010. Please note that grounding SREF will disconnect the 3.3 V side for all channels.
I think that the bottom line is that the 3.3 V side needs to be disconnected in order for the 2.2 k
jumpers to work
because the on resistance of the GTL2010 is only a few ohms when either side is low and it only rises slowly as the
low voltage rises until it is within less than 1 V below the SREF then it rises like 1/(V applied - V of SREF)**2 to
about 200 k
when V applied = V of SREF and then increases exponentially. So the low could be pulled up by the
3.3 V side to above 0.75 V and a low on the 3.3 V side would certainly pull the 2.2 k
pull-up resistor on the 1.5 V
side low.
15.
Multi-part Question:
We intend to use the GTL2000 for a PCI to AGP converter. The device will bi-directionally translate 1.5 V to 3.3 V.
Question A:
Pull up resistors: We would like to be sure they are not needed on both sides of the device. Our guess
would be that they are needed only on the High side but they want to be sure.
Answer A:
No pull-up is required on the low voltage side unless that side is known to have a significant leakage to
ground i.e. >10
μ
A.
Question B:
Propagation delay: spec says between 0.5 and 5.5 ns. They would like to have more info on that like
simulations or characterization results if possible.
Answer B:
The GTL2000 (and GTL2002 and 10) can be thought of as acting like a wire, with a little resistance and
some capacitance. The characterization data that can be found in Figure 19 shows the following:
-
The high to low transition is less than 1 ns with a strong pull-down driver driving through the GTL2000.
-
The low to high transition is determined by the RC time constant. The ~1.2 ns in the characterization represents
the added delay because of the capacitance of the GTL2000. The actual low to high transition time in the system
is determined by the total RC time constant and the relevant pick off points. For example if the pull-up is 200
and the total capacitance is 100 pF, the time constant would be 20 ns and for a pick off point that is 1/2 the
swing the delay would be ~14 ns.
Figure 19. Propagation delay characterization results
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