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HWD481 데이터시트 PDF




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부품번호 HWD481 기능
기능 (HWD481 - HWDxxx) Slew-Rate-Limited RS-485/RS-422 Transceivers
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HWD481 데이터시트, 핀배열, 회로
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




HWD481 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
SWITCHING CHARACTERISTICS—HWD481/HWD485, HWD490/HWD491, HWD1487 (continued)
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Driver Enable from Shutdown to
Output High (HWD481)
tZH(SHDN)
Figures 7 and 9, CL = 100pF, S2 closed
40 100 ns
Driver Enable from Shutdown to
Output Low (HWD481)
tZL(SHDN)
Figures 7 and 9, CL = 100pF, S1 closed
40 100 ns
Receiver Enable from Shutdown
to Output High (HWD481)
tZH(SHDN)
Figures 5 and 11, CL = 15pF, S2 closed,
A - B = 2V
300 1000
ns
Receiver Enable from Shutdown
to Output Low (HWD481)
tZL(SHDN)
Figures 5 and 11, CL = 15pF, S1 closed,
B - A = 2V
300 1000
ns
SWITCHING CHARACTERISTICS—HWD483, HWD487/HWD488/HWD489
(VCC = 5V ±5%, TA = TMIN to TMAX, unless otherwise noted.) (Notes 1, 2)
PARAMETER
Driver Input to Output
Driver Output Skew to Output
SYMBOL
tPLH
tPHL
tSKEW
CONDITIONS
Figures 6 and 8, RDIFF = 54,
CL1 = CL2 = 100pF
Figures 6 and 8, RDIFF = 54,
CL1 = CL2 = 100pF
MIN TYP
250 800
250 800
100
Driver Rise or Fall Time
tR, tF
Figures 6 and 8, RDIFF = 54,
CL1 = CL2 = 100pF
250
Driver Enable to Output High
tZH Figures 7 and 9, CL = 100pF, S2 closed
Driver Enable to Output Low
tZL Figures 7 and 9, CL = 100pF, S1 closed
Driver Disable Time from Low
tLZ Figures 7 and 9, CL = 15pF, S1 closed
Driver Disable Time from High
tHZ Figures 7 and 9, CL = 15pF, S2 closed
Receiver Input to Output
tPLH
tPHL
Figures 6 and 10, RDIFF = 54,
CL1 = CL2 = 100pF
I tPLH - tPHL I Differential
Receiver Skew
tSKD
Figures 6 and 10, RDIFF = 54,
CL1 = CL2 = 100pF
Receiver Enable to Output Low
tZL Figures 5 and 11, CRL = 15pF, S1 closed
Receiver Enable to Output High tZH Figures 5 and 11, CRL = 15pF, S2 closed
Receiver Disable Time from Low
Receiver Disable Time from High
Maximum Data Rate
tLZ
tHZ
fMAX
Figures 5 and 11, CRL = 15pF, S1 closed
Figures 5 and 11, CRL = 15pF, S2 closed
tPLH, tPHL < 50% of data period
Time to Shutdown
tSHDN
Driver Enable from Shutdown to
Output High
tZH(SHDN)
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
Receiver Enable from Shutdown
to Output High
tZH(SHDN)
Receiver Enable from Shutdown
to Output Low
tZL(SHDN)
HWD483/HWD487 (Note 5)
HWD483/HWD487, Figures 7 and 9,
CL = 100pF, S2 closed
HWD483/HWD487, Figures 7 and 9,
CL = 100pF, S1 closed
HWD483/HWD487, Figures 5 and 11,
CL = 15pF, S2 closed
HWD483/HWD487, Figures 5 and 11,
CL = 15pF, S1 closed
250
250
300
300
250
250
100
20
20
20
20
250
50 200
MAX
2000
2000
UNITS
ns
800 ns
2000
2000
2000
3000
3000
2000
2000
50
50
50
50
600
2000
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
kbps
ns
ns
2000
ns
2500
ns
2500
ns
4

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HWD481 전자부품, 판매, 대치품
www.DataSheet4U.com
Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
______________________________________________________________Pin Description
PIN
HWD481/HWD483/
HWD485/HWD487/
HWD1487
HWD488/
HWD490
DIP/SO µMAX DIP/SO µMAX
1324
2 4 ——
3 5 ——
4635
5746
——
5
7
——
6
8
6 8 ——
——
8
2
7 1 ——
——
7
1
8213
————
HWD489/
HWD491
NAME
NAME
DIP/SO
2 RO
3 RE
4 DE
5
6, 7
9
10
12
11
14
1, 8, 13
DI
GND
Y
Z
A
A
B
B
VCC
N.C.
FUNCTION
FUNCTION
Receiver Output: If A > B by 200mV, RO will be high;
If A < B by 200mV, RO will be low.
Receiver Output Enable. RO is enabled when RE is low; RO is
high impedance when RE is high.
Driver Output Enable. The driver outputs, Y and Z, are enabled
by bringing DE high. They are high impedance when DE is low. If
the driver outputs are enabled, the parts function as line drivers.
While they are high impedance, they function as line receivers if
RE is low.
Driver Input. A low on DI forces output Y low and output Z high.
Similarly, a high on DI forces output Y high and output Z low.
Ground
Noninverting Driver Output
Inverting Driver Output
Noninverting Receiver Input and Noninverting Driver Output
Noninverting Receiver Input
Inverting Receiver Input and Inverting Driver Output
Inverting Receiver Input
Positive Supply: 4.75V VCC 5.25V
No Connect—not internally connected
TOP VIEW
RO 1
RE 2
DE 3
DI 4
R
D
DIP/SO
B1
VCC 2
RO 3
RE 4
HWD481
HWD483
HWD485
HWD487
HWD1487
µMAX
8 VCC
7B
6A
5 GND
8A
RO 1
RE 2
DE 3
DI 4
R
D
8 VCC
7B
Rt
6
A
5 GND
HWD481
HWD483
HWD485
HWD487
HWD1487
B
Rt
DE
DI
D
A
R
RO
7 GND
6 DI
RE
5 DE
NOTE: PIN LABELS Y AND Z ON TIMING, TEST, AND WAVEFORM DIAGRAMS REFER TO PINS A AND B WHEN DE IS HIGH.
TYPICAL OPERATING CIRCUIT SHOWN WITH DIP/SO PACKAGE.
Figure 1. HWD481/HWD483/HWD485/HWD487/HWD1487 Pin Configuration and Typical Operating Circuit
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