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PDF ( 数据手册 , 数据表 ) HWD481

零件编号 HWD481
描述 (HWD481 - HWDxxx) Slew-Rate-Limited RS-485/RS-422 Transceivers
制造商 ETC
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HWD481 数据手册, 描述, 功能
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Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
General Description
The HWD481, HWD483, HWD485, HWD487–HWD491, and
HWD1487 are low-power transceivers for RS-485 and RS-
422 communication. Each part contains one driver and one
receiver. The HWD483, HWD487, HWD488, and HWD489
feature reduced slew-rate drivers that minimize EMI and
reduce reflections caused by improperly terminated cables,
thus allowing error-free data transmission up to 250kbps.
The driver slew rates of the HWD481, HWD485, HWD490,
HWD491, and HWD1487 are not limited, allowing them to
transmit up to 2.5Mbps.
These transceivers draw between 120µA and 500µA of
supply current when unloaded or fully loaded with disabled
drivers. Additionally, the HWD481, HWD483, and HWD487
have a low-current shutdown mode in which they consume
only 0.1µA. All parts operate from a single 5V supply.
Drivers are short-circuit current limited and are protected
against excessive power dissipation by thermal shutdown
circuitry that places the driver outputs into a high-imped-
ance state. The receiver input has a fail-safe feature that
guarantees a logic-high output if the input is open circuit.
The HWD487 and HWD1487 feature quarter-unit-load
receiver input impedance, allowing up to 128 HWD487/
HWD1487 transceivers on the bus. Full-duplex communi-
cations are obtained using the HWD488–HWD491, while
the HWD481, HWD483, HWD485, HWD487, and HWD1487
are designed for half-duplex applications.
________________________Applications
Low-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
__Next Generation Device Features
For Fault-Tolerant Applications
HWD3430: ±80V Fault-Protected, Fail-Safe, 1/4
Unit Load, +3.3V, RS-485 Transceiver
HWD3440E–HWD3444E: ±15kV ESD-Protected,
±60V Fault-Protected, 10Mbps, Fail-Safe,
RS-485/J1708 Transceivers
For Space-Constrained Applications
HWD3460–HWD3464: +5V, Fail-Safe, 20Mbps,
Profibus RS-485/RS-422 Transceivers
HWD3362: +3.3V, High-Speed, RS-485/RS-422
Transceiver in a SOT23 Package
HWD3280E–HWD3284E: ±15kV ESD-Protected,
52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,
True Fail-Safe Receivers
HWD3293/HWD3294/HWD3295: 20Mbps, +3.3V,
SOT23, RS-855/RS-422 Transmitters
For Multiple Transceiver Applications
HWD3030E–HWD3033E: ±15kV ESD-Protected,
+3.3V, Quad RS-422 Transmitters
For Fail-Safe Applications
HWD3080–HWD3089: Fail-Safe, High-Speed
(10Mbps), Slew-Rate-Limited RS-485/RS-422
Transceivers
For Low-Voltage Applications
HWD3483E/HWD3485E/HWD3486E/HWD3488E/
HWD3490E/HWD3491E: +3.3V Powered, ±15kV
ESD-Protected, 12Mbps, Slew-Rate-Limited,
True RS-485/RS-422 Transceivers
Ordering Information appears at end of data sheet.
______________________________________________________________Selection Table
PART HALF/FULL DATA RATE SLEW-RATE LOW-POWER
NUMBER DUPLEX
(Mbps)
LIMITED SHUTDOWN
HWD481
Half
2.5
No Yes
HWD483
Half
0.25
Yes
Yes
HWD485
Half
2.5
No
No
HWD487
Half
0.25
Yes
Yes
HWD488
Full
0.25
Yes
No
HWD489
Full
0.25
Yes
No
HWD490
Full
2.5
No
No
HWD491
Full
2.5
No
No
HWD1487
Half
2.5
No
No
RECEIVER/
DRIVER
ENABLE
Yes
Yes
Yes
Yes
No
Yes
No
Yes
Yes
QUIESCENT
CURRENT
(µA)
300
120
300
120
120
120
300
300
230
NUMBER OF
TRANSMITTERS
ON BUS
32
32
32
128
32
32
32
32
128
PIN
COUNT
8
8
8
8
8
14
8
14
8
1







HWD481 pdf, 数据表
www.DataSheet4U.com
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
TOP VIEW
VCC 1
RO 2
DI 3
GND 4
R
D
VCC VCC
8A
7B
1
HWD488
HWD490
6Z
5Y
3
DI
D
5Y
6Z
Rt R
DIP/SO
B1
A2
VCC 3
RO 4
HWD488
HWD490
8Z
7Y
6 GND
5 DI
2
RO
8A
R
Rt
7
B
4
GND
D
GND
µMAX
NOTE: TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.
Figure 2. HWD488/HWD490 Pin Configuration and Typical Operating Circuit
RO
DI
TOP VIEW
N.C. 1
RO 2
RE 3
DE 4
DI 5
GND 6
GND 7
14 VCC
R 13 N.C.
12 A
11 B
10 Z
D
9Y
8 N.C.
DIP/SO
DI 5
RO 2
NC 1, 8, 13
DE VCC
4 14
D
R
9Y
10
Z
12 A
Rt
11
B
3 6, 7
RE GND
Figure 3. HWD489/HWD491 Pin Configuration and Typical Operating Circuit
HWD489
HWD491
VCC RE
Rt R
D
GND DE
RO
DI
__________Applications 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 Transceivers 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 (12kinput
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 12kReceiver Input impedance.
8







HWD481 equivalent, schematic
www.DataSheet4U.com
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
_____________________________________________Chip Topographies (continued)
RO
N.C.
N.C.
DI
HWD488/HWD490
VCC
A
B
0.054"
Z (1.372mm)
Y
GND
0.080"
(2.032mm)
RO
RE
DE
DI
HWD489/HWD491
VCC
A
B
0.054"
Z (1.372mm)
Y
GND
0.080"
(2.032mm)
TRANSISTOR COUNT: 248
SUBSTRATE CONNECTED TO GND
16










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