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參數(shù)資料
| 型號(hào)： | EVM749EVM |
| 廠(chǎng)商： | Semtech Corporation |
| 元件分類(lèi)： | 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)： | 4/14頁(yè) |
| 文件大?。?/td> | 104K |
| 代理商： | EVM749EVM |
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4
2000 Semtech Corp.
www.semtech.com
EDGE HIGH-PERFORMANCE PRODUCTS
Circuit Description
Edge749
Driver Description
Figure 1. Driver Diagram
As shown in Figure 1, Edge749 supports programmable
high and low levels and tristate per channel. There are
no shared lines between any drivers. The DVR EN* and
DATA IN signals are TTL compatible inputs that control
the driver (see Figure 2).
With DVR EN* high, the DUT driver goes into a high
impedance state. With DVR EN* low, DATA IN high forces
the driver into a high state (DUT = V
HIGH
), and DATA IN
low forces the driver low (DUT = V
LOW
).
Figure 2. Driver Functionality
V
HIGH
and V
LOW
V
HIGH
and V
LOW
define the logical
“
1
”
and
“
0
”
levels of
the DUT driver and can be adjusted anywhere over the
range determined by VCC and VEE. Table 1 documents
the relationship between the analog power to supplies
(VCC and VEE), the driver range (V
HIGH
and V
LOW
), and
the comparator threshold range (V
THRESHOLD
).
The V
HIGH
and V
LOW
inputs are unbuffered in that they
also provide the driver output current (see Figure 3), so
the source of V
HIGH
and V
LOW
must have ample current
drive capability.
Figure 3.
Simplified Model of the
Unbuffered Output Stage
Table 1. Headroom vs. Power Supplies
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DUT
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