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參數(shù)資料
| 型號(hào)： | EVM749EVM |
| 廠商： | Semtech Corporation |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 電可擦除可編程邏輯器件 |
| 文件頁(yè)數(shù)： | 9/14頁(yè) |
| 文件大?。?/td> | 104K |
| 代理商： | EVM749EVM |
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9
2000 Semtech Corp.
www.semtech.com
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information
(continued)
Edge749
Driver Output Impedance
Ideally, a driver would have a constant
output impedance over all ouptut
conditions. However, the Edge749
ouptut impedance does vary slightly
over the common mode drive level and
whether it is driving high or low. Figure
12 shows the variation in Rout.
High Impedance Leakage
The Edge749 is designed to be
extremely low leakage (see Figure 13.)
In a low performance application, where
the output capacitance is not a concern,
the low leakage may allow the
elimination of an isolation relay.
Figure 12. ROUT vs. DOUT
Figure 13. High Impedance Leakage
Edge749 Ron vs. Vout - VCC=+16.5V, VEE=-1.5V
Vout [V]
R
6
6.5
7
7.5
8
8.5
9
9.5
-
-
0
1
2
3
4
5
6
7
8
9
1
1
1
1
1
1
1
R_VLO
R_VHI
Edge749 Leakage in HIZ - VCC=+16.5V, VEE=-1.5V
Dout [Volts]
-10
- 8
- 6
- 4
- 2
0
2
4
6
8
10
-
-
-
0
1
2
3
4
5
6
7
8
9
1
1
1
1
1
1
1
1
VLO=0, VHI=+8
Figure 11. Family A/B Using Two Drivers Per Pin
DUT0
DVR DATA
DVR EN*A
DVR EN*B
VHIGH A
VHIGH B
VLOW B
VLOW A
CHANNEL 1
DUT0
DVR DATA
DVR EN*A
DVR EN*B
CHANNEL n
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