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參數(shù)資料
| 型號： | DS276 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 通用總線功能 |
| 英文描述： | Low Power Transceiver Chip(低功率的RS232收發(fā)器芯片) |
| 中文描述： | LINE TRANSCEIVER, PDIP8 |
| 封裝： | 0.300 INCH, DIP-8 |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 89K |
| 代理商： | DS276 |
DS276
021998 4/11
SINGLE 3V OPERATION
Figure 2
RX
OUT
V
DRV+
TX
IN
GND
V
CC
RX
IN
V
DRV–
TX
OUT
3V
TTL/
CMOS
RS–232
CONNECTOR
–2 to –13V
(See Note 3)
SINGLE 5V OPERATION
Figure 3
(not true RS–232)
RX
OUT
V
DRV+
TX
IN
GND
V
CC
RX
IN
V
DRV–
TX
OUT
5V
TTL/
CMOS
RS–232
CONNECTOR
or 0 to –13V
(See Note 1 and 3)
“STEALING” NEGATIVE SUPPLY
Figure 4
RX
OUT
V
DRV+
TX
IN
GND
V
CC
RX
IN
V
DRV–
TX
OUT
V
CC
(3 – 5V)
TTL/
CMOS
RS–232
CONNECTOR
22
μ
F
(See Note 2)
NOTES:
1. This circuit as shown does not meet the RS–232 requirement for signal levels (High–level output voltage). How-
ever, as most RS–232 receivers will interpret any voltage over 2V as a space this will normally be of no conse-
quence. Alternatively, V
DRV+
can be supplied independently from a higher voltage supply.
2. The capacitor is charged negatively whenever RX
IN
is in a marking (or idle) state. When the DS276 is transmitting
marking data and RX
IN
is spacing the capacitor will discharge towards ground with a time constant determined
by the capacitor value and the value of the load resistance. The value shown should store sufficient charge for
reliable operation up to 20K bps.
3. RX
IN
must never be allowed to reach a negative voltage with respect to V
DRV–
or excessive currents will be drawn.
Therefore, if negative voltage swings are present on RX
IN
, V
DRV–
should not be connected to ground and the
circuit shown in Figure 4 should be used.
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