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參數(shù)資料
| 型號(hào)： | HWD491ESD |
| 廠(chǎng)商： | Electronic Theatre Controls, Inc. |
| 元件分類(lèi)： | RS-485 |
| 英文描述： | Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers |
| 中文描述： | 低功耗，限擺率限制RS-485/RS-422收發(fā)器 |
| 文件頁(yè)數(shù)： | 8/20頁(yè) |
| 文件大小： | 502K |
| 代理商： | HWD491ESD |
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__________Applic ations Information
The HWD481/HWD483/HWD485/HWD487–HWD491 and
HWD1487 are low-power transceivers for RS-485 and RS-
422 communications. The HWD481, HWD485, HWD490,
HWD491, and HWD1487 can transmit and receive at data
rates up to 2.5Mbps, while the HWD483, HWD487,
HWD488, and HWD489 are specified for data rates up to
250kbps. The HWD488–HWD491 are full-duplex trans-
ceivers while the HWD481, HWD483, HWD485, HWD487,
and HWD1487 are half-duplex. In addition, Driver Enable
(DE) and Receiver Enable (RE) pins are included on the
HWD481, HWD483, HWD485, HWD487, HWD489,
HWD491, and HWD1487. When disabled, the driver and
receiver outputs are high impedance.
HWD487/HWD1487:
128 T ransc eivers on the Bus
The 48k
,
1
/
4
-unit-load receiver input impedance of the
HWD487 and HWD1487 allows up to 128 transceivers
on a bus, compared to the 1-unit load (12k
input
impedance) of standard RS-485 drivers (32 trans-
ceivers maximum). Any combination of HWD487/
HWD1487 and other RS-485 transceivers with a total of
32 unit loads or less can be put on the bus. The
HWD481/HWD483/HWD485 and HWD488–HWD491 have
standard 12k
Receiver Input impedance.
Low-Power, S lew-Rate-Limited
RS -485/RS -422 Transc eivers
HWD488
HWD490
TOP VIEW
1
2
3
4
RO
DI
GND
8
7
6
5
A
B
Z
Y
V
CC
DIP/SO
R
D
Rt
Rt
V
CC
5
6
7
8
RO
DI
GND
4
GND
DI
RO
3
2
A
B
Y
Z
V
CC
D
R
R
D
1
3
V
CC
4
RO
2
A
1
6
5
7
8
GND
DI
Y
Z
B
μ
MAX
HWD488
HWD490
NOTE: TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SOPACKAGE.
HWD489
HWD491
DIP/SO
TOP VIEW
Rt
Rt
DE
V
CC
RE GND
V
CC
RE
GND
DE
RO
DI
9
10
12
11
B
A
Z
Y
5
RO
NC
DI
2
1, 8, 13
3
6, 7
14
4
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
N.C.
N.C.
A
B
Z
Y
N.C.
RO
RE
DE
DI
GND
GND
R
D
D
R
D
R
Figure 2. HWD488/HWD490 Pin Configuration and Typical Operating Circuit
Figure 3. HWD489/HWD491 Pin Configuration and Typical Operating Circuit
8
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