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HWD483 Schematic ( PDF Datasheet ) - ETC

Teilenummer HWD483
Beschreibung (HWD481 - HWDxxx) Slew-Rate-Limited RS-485/RS-422 Transceivers
Hersteller ETC
Logo ETC Logo 




Gesamt 20 Seiten
HWD483 Datasheet, Funktion
www.DataSheet4U.com
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






HWD483 Datasheet, Funktion
www.DataSheet4U.com
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
____________________________Typical Operating Characteristics (continued)
(VCC = 5V, TA = +25°C, unless otherwise noted.)
OUTPUT CURRENT vs.
DRIVER OUTPUT LOW VOLTAGE
140
120
OUTPUT CURRENT vs.
DRIVER OUTPUT HIGH VOLTAGE
-120
-100
HWD481/HWD485/HWD490/HWD491
SUPPLY CURRENT vs. TEMPERATURE
600
HWD481/HWD485; DE = VCC, RE = X
500
100
-80 400
80
-60 300
60 HWD485; DE = 0, RE = X,
40
-40
HWD481; DE = RE = 0
200 HWD490/HWD491; DE = RE = X
20
0
0
2 4 6 8 10
OUTPUT LOW VOLTAGE (V)
12
-20
0
-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5
OUTPUT HIGH VOLTAGE (V)
100
HWD481; DE = 0, RE = VCC
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
HWD483/HWD487–HWD489
SUPPLY CURRENT vs. TEMPERATURE
600
HWD1487
SUPPLY CURRENT vs. TEMPERATURE
600
500 500
400 HWD483; DE = VCC, RE = X
300
HWD487; DE = VCC, RE = X
200 HWD483/HWD487; DE = RE = 0,
HWD488/HWD489; DE = RE = X
100
HWD483/HWD487; DE = 0, RE = VCC
0
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
400
300 HWD1487; DE = VCC, RE = X
200
HWD1487; DE = 0V, RE = X
100
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
6

6 Page









HWD483 pdf, datenblatt
www.DataSheet4U.com
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
TTL IN
tR, tF < 6ns
100pF
Z
D
Y
R = 54
100pF
B
R
A
RECEIVER
OUT
Figure 14. Receiver Propagation Delay Test Circuit
A
500mV/div
B
RO
2V/div
VCC = 5V
TA = +25°C
20ns/div
Figure 15. HWD481/HWD485/HWD490/HWD491/HWD487
Receiver tPHL
B
500mV/div
VCC = 5V
TA = +25°C
A
2V/div
RO
20ns/div
Figure 16. HWD481/HWD485/HWD490/HWD491/HWD1487
Receiver tPLH
A
500mV/div
B
RO
2V/div
VCC = 5V
TA = +25°C
400ns/div
Figure 17. HWD483, HWD487–HWD489 Receiver tPHL
B
500mV/div
A
2V/div
RO
VCC = 5V
TA = +25°C
400ns/div
Figure 18. HWD483, HWD487–HWD489 Receiver tPLH
12

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