DS75176 [NSC]
Multipoint RS-485/RS-422 Transceivers; 多点RS - 485 / RS -422收发器
| 型号： | DS75176 |
| 厂家： | 
National Semiconductor |
| 描述： | Multipoint RS-485/RS-422 Transceivers |
| 文件： | 总8页 (文件大小：236K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
July 2004
DS75176B/DS75176BT
Multipoint RS-485/RS-422 Transceivers
General Description
Features
The DS75176B is a high speed differential TRI-STATE®
bus/line transceiver designed to meet the requirements of
EIA standard RS485 with extended common mode range
(+12V to −7V), for multipoint data transmission. In addition, it
is compatible with RS-422.
n Meets EIA standard RS485 for multipoint bus
transmission and is compatible with RS-422.
n Small Outline (SO) Package option available for
minimum board space.
n 22 ns driver propagation delays.
The driver and receiver outputs feature TRI-STATE capabil-
ity, for the driver outputs over the entire common mode
range of +12V to −7V. Bus contention or fault situations that
cause excessive power dissipation within the device are
handled by a thermal shutdown circuit, which forces the
driver outputs into the high impedance state.
n Single +5V supply.
n −7V to +12V bus common mode range permits 7V
ground difference between devices on the bus.
n Thermal shutdown protection.
n High impedance to bus with driver in TRI-STATE or with
power off, over the entire common mode range allows
the unused devices on the bus to be powered down.
n Pin out compatible with DS3695/A and SN75176A/B.
n Combined impedance of a driver output and receiver
input is less than one RS485 unit load, allowing up to 32
transceivers on the bus.
DC specifications are guaranteed over the 0 to 70˚C tem-
perature and 4.75V to 5.25V supply voltage range.
n 70 mV typical receiver hysteresis.
Connection and Logic Diagram
00875901
Top View
Order Number DS75176BN, DS75176BTN, DS75176BM or DS75176BTM
See NS Package Number N08E or M08A
TRI-STATE® is a registered trademark of National Semiconductor Corp.
© 2004 National Semiconductor Corporation
DS008759
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Absolute Maximum Ratings (Note 1)
ESD Rating (HBM)
500V
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Recommended Operating
Conditions
Supply Voltage, VCC
7V
7V
Min Max Units
Control Input Voltages
Driver Input Voltage
Supply Voltage, VCC
Voltage at Any Bus Terminal
(Separate or Common Mode)
Operating Free Air Temperature TA
DS75176B
4.75 5.25
−7 +12
V
V
7V
Driver Output Voltages
Receiver Input Voltages (DS75176B)
Receiver Output Voltage
+15V/ −10V
+15V/ −10V
5.5V
0
+70
˚C
˚C
@
Continuous Power Dissipation
25˚C
DS75176BT
−40 +85
Differential Input Voltage,
VID (Note 6)
for M Package
675 mW (Note 5)
900 mW (Note 4)
−65˚C to +150˚C
−12 +12
V
for N Package
Storage Temperature Range
Lead Temperature
(Soldering, 4 seconds)
260˚C
Electrical Characteristics (Notes 2, 3)
<
<
0˚C ≤ TA≤ 70˚C, 4.75V VCC 5.25V unless otherwise specified
Symbol
Parameter
Differential Driver Output
Voltage (Unloaded)
Conditions
Min Typ Max Units
VOD1
IO = 0
5
V
VOD2
Differential Driver Output
Voltage (with Load)
(Figure 1)
R = 50Ω; (RS-422) (Note 7)
R = 27Ω; (RS-485)
2
V
V
1.5
∆VOD
Change in Magnitude of Driver
Differential Output Voltage For
Complementary Output States
Driver Common Mode Output
Voltage
0.2
3.0
V
V
VOC
(Figure 1)
R = 27Ω
∆|VOC
|
Change in Magnitude of Driver
Common Mode Output Voltage
For Complementary Output
States
0.2
V
V
VIH
VIL
VCL
IIL
Input High Voltage
2
Input Low Voltage
DI, DE,
RE , E
0.8
Input Clamp Voltage
IIN = −18 mA
VIL = 0.4V
VIH = 2.4V
VIN = 12V
VIN = −7V
−1.5
Input Low Current
−200 µA
20 µA
IIH
Input High Current
IIN
Input
DO/RI, DO/RI
VCC = 0V or 5.25V
DE = 0V
+1.0 mA
−0.8 mA
Current
VTH
Differential Input Threshold
Voltage for Receiver
Receiver Input Hysteresis
Receiver Output High Voltage
Output Low Voltage
OFF-State (High Impedance)
Output Current at Receiver
Receiver Input Resistance
Supply Current
−7V ≤ VCM ≤ + 12V
−0.2
2.7
+0.2
V
∆VTH
VOH
VOL
VCM = 0V
70
mV
V
IOH = −400 µA
IOL = 16 mA (Note 7)
VCC = Max
RO
0.5
20
V
IOZR
µA
0.4V ≤ VO ≤ 2.4V
−7V ≤ VCM ≤ +12V
No Load
RIN
ICC
12
kΩ
mA
mA
Driver Outputs Enabled
Driver Outputs Disabled
55
35
(Note 7)
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2
Electrical Characteristics (Notes 2, 3) (Continued)
<
<
0˚C ≤ TA≤ 70˚C, 4.75V VCC 5.25V unless otherwise specified
Symbol
Parameter
Driver Short-Circuit
Conditions
Min Typ Max Units
−250 mA
IOSD
VO = −7V (Note 7)
VO = +12V (Note 7)
VO = 0V
Output Current
+250 mA
IOSR
Receiver Short-Circuit
Output Current
−15
−85
mA
Note 1: “Absolute Maximum Ratings” are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should
be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.
Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified.
Note 3: All typicals are given for V
= 5V and T = 25˚C.
A
CC
Note 4: Derate linearly at 5.56 mW/˚C to 650 mW at 70˚C.
@
Note 5: Derate linearly 6.11 mW/˚C to 400 mW at 70˚C.
Note 6: Differential - Input/Output bus voltage is measured at the noninverting terminal A with respect to the inverting terminal B.
<
Note 7: All worst case parameters for which note 7 is applied, must be increased by 10% for DS75176BT. The other parameters remain valid for −40˚C
T
A
<
+85˚C.
Switching Characteristics
VCC = 5.0V, TA = 25˚C
Symbol
Parameter
Driver Input to Output
Driver Input to Output
Driver Rise Time
Conditions
Min
Typ
12
Max
22
Units
ns
tPLH
tPHL
tr
RLDIFF = 60Ω
CL1 = CL2 = 100 pF
17
22
ns
RLDIFF = 60Ω
18
ns
tf
Driver Fall Time
CL1 =CL2 = 100 pF
18
ns
(Figure 3 and Figure 5)
tZH
tZL
tLZ
tHZ
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable Time from Low
Driver Disable Time from High
CL = 100 pF (Figure 4 and Figure 6) S1
29
31
13
19
100
60
ns
ns
ns
ns
Open
CL = 100 pF (Figure 4 and Figure 6) S2
Open
CL = 15 pF (Figure 4 and Figure 6) S2
30
Open
CL = 15 pF (Figure 4 and Figure 6) S1
200
Open
tPLH
tPHL
tZL
Receiver Input to Output
Receiver Input to Output
Receiver Enable to Output Low
CL = 15 pF (Figure 2 and Figure 7)
30
32
15
37
37
20
ns
ns
ns
S1 and S2 Closed
CL = 15 pF (Figure 2 and Figure 8) S2
Open
tZH
tLZ
tHZ
Receiver Enable to Output High
Receiver Disable from Low
Receiver Disable from High
CL = 15 pF (Figure 2 and Figure 8) S1
11
28
13
20
32
35
ns
ns
ns
Open
CL = 15 pF (Figure 2 and Figure 8) S2
Open
CL = 15 pF (Figure 2 and Figure 8) S1
Open
3
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AC Test Circuits
00875904
FIGURE 3.
00875902
FIGURE 1.
00875905
Note: Unless otherwise specified the switches are closed.
FIGURE 4.
00875903
Note: S1 and S2 of load circuit are closed except as otherwise mentioned.
FIGURE 2.
Switching Time Waveforms
00875906
FIGURE 5. Driver Propagation Delays and Transition Times
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4
Switching Time Waveforms (Continued)
00875907
FIGURE 6. Driver Enable and Disable Times
00875908
Note: Differential input voltage may may be realized by grounding RI and pulsing RI between +2.5V and −2.5V
FIGURE 7. Receiver Propagation Delays
00875909
FIGURE 8. Receiver Enable and Disable Times
5
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Function Tables
DS75176B Transmitting
Inputs
Line
Condition
No Fault
No Fault
X
Outputs
RE
X
DE
1
DI
1
DO
DO
1
0
1
Z
Z
X
1
0
0
X
0
X
X
Z
X
1
Fault
Z
DS75176B Receiving
Inputs
RI-RI
Outputs
RE
DE
RO
1
0
0
0
1
0
0
0
0
≥ +0.2V
≤ −0.2V
Inputs Open**
X
0
1
Z
X — Don’t care condition
Z — High impedance state
Fault — Improper line conditons causing excessive power dissipation in the driver, such as shorts or bus contention
situations
**This is a fail safe condition
Typical Application
00875911
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6
Physical Dimensions inches (millimeters)
unless otherwise noted
Lit. # 103669
Molded Dual-In-Line Package (N)
Order Number DS75176BN or DS75176BTN
NS Package Number N08E
7
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Notes
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification
(CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
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