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參數(shù)資料
| 型號： | E211-EDGE211 |
| 英文描述： | Dual Pin Electronics Driver |
| 中文描述： | 雙引腳電子驅(qū)動器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 88K |
| 代理商： | E211-EDGE211 |
4
2000 Semtech Corp.
www.semtech.com
HIGH-PERFORMANCE PRODUCTS – ATE
Edge211
Circuit Description
Driver Description
The Edge211 supports three distinct programmable driver
levels – high, low, and termination, along with high
impedance. There are no restrictions between any of these
three levels in that all three may vary independently over
the entire operating voltage range between VCC and VEE.
Digital Inputs
All digital inputs are wide voltage comparator inputs, and
are therefore technology independent. The Edge211 may
be driven by TTL, ECL, CMOS, or any custom level circuitry.
Figure 1. Driver Digital Inputs
Do NOT leave any driver digital inputs floating.
The DVR EN*, DATA, and VTT EN are digital input pins that
can be used to control the driver output level displayed at
the DOUT pin.
DVR EN, DATA*, and VTT EN* can be connected to a
reference voltage which defines the logic triggering level.
The relationship between the driver control pins and their
corresponding logic levels can be seen in Table 1.
Table 1.
Using the logic levels defined in Table 1, driver functionality
is described in Table 2.
Table 2.
Note that DVR EN* determines whether the driver output
state will be controlled by the VTT EN or the DATA pin.
With DVR EN high (Logic 1), the driver output pin, DOUT,
is controlled by the VTT EN pin and can be toggled between
the voltage value applied at VTT, and a high impedance
state. With DVR En* low (Logic 0), DOUT can be toggled
between the voltage values applied to the VL and VH pins
by using the DATA input pin.
VH, VL, and VTT
VH, VL, and VTT define the logical “1”, “0”, and
“termination” levels of the driver and can be adjusted
anywhere over the range spanned by VCC to VEE. There
is no restriction between VH, VL, and VTT, in that they can
all vary independently over the entire voltage range
determined by the power supply levels.
The VH, VL, and VTT inputs are unbuffered in that they
also provide the driver output current, so the sources of
these voltages must have ample current drive capability.
While VTT is referred to as the termination voltage, it may
also be used as a very high “programming” level on many
memory devices.
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