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參數資料
| 型號： | MC34059FTA |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | HEX EIA-485 TRANSCEIVER with THREE-STATE OUTPUTS |
| 中文描述： | LINE TRANSCEIVER, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數： | 6/12頁 |
| 文件大小： | 237K |
| 代理商： | MC34059FTA |
MC34058 MC34059
6
MOTOROLA ANALOG IC DEVICE DATA
Figure 5. VOH versus IOH
– 10
0.4
0
1.1
–100
4.0
– 80
4.6
I
INPUT VOLTAGE (V)
IOL (mA)
IOD (mA)
VODH
VO
IOH (mA)
Figure 6. VOL versus IOL
Figure 7. VOD versus IOL
Figure 8. Input Characteristics of
OAX and OAB
VO
VO
– 60
– 40
– 20
0
20
10
20
30
40
50
60
70
80
– 5.0
0
5.0
10
15
– 50
0
50
100
4.4
4.2
4.0
3.8
0.9
1.0
0.8
0.6
0.7
0.5
0.3
0.1
– 0.1
– 0.3
– 0.4
– 0.2
0
0.2
2.0
0
– 2.0
– 4.0
3.6
VODL
OAX_lin(mA)
OBX_lin(mA)
Description
The MC34058/9 is a differential line driver designed to
comply with EIA–485 Standard for use in balanced digital
multipoint systems containing multiple drivers. The drivers
also comply with EIA–422–A and CCITT Recommendations
V.11 and X.27. Positive and negative current limiting of the
drivers meet the EIA–485 requirement for protection from
damage in the event that two or more drivers try to transmit
simultaneously on the same cable. Data rates in excess of
10 MBPS are possible, depending on the cable length and
cable characteristics. Only a single power supply, 5.0 V
±
10% is required.
Driver Inputs
The driver inputs and enable logic determine the state of
the outputs in accordance with Table 1. The driver inputs have
a nominal threshold of 1.2 V, and the voltage must be kept
within the range of 0 V to VCC for proper operation. If the
voltage is taken more than 0.5 V below ground or above VCC,
excessive currents will flow and proper operation of the
drivers will be affected. An open Pin is equivalent to a logic
high, but good design practices dictate that inputs should
never be left open. The inputs are TTL type and their
characteristics are unchanged by the state of the enable pins.
Driver Outputs
Each output (when active) will be a low or a high voltage,
depending on the input state and the load current (see
Tables 1, 2 and Figures 2 and 3). The graphs apply to each
driver, regardless of how many other drivers within the
package are supplying load current.
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