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參數(shù)資料
| 型號： | MAX3471EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 1.6レA, RS-485/RS-422, Half-Duplex, Differential Transceiver for Battery-Powered Systems |
| 中文描述： | LINE TRANSCEIVER, PDSO8 |
| 封裝： | UMAX-8 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 86K |
| 代理商： | MAX3471EUA |
__________ Applic ations Information
T ransc eivers on the Bus
The MAX3471 is optimized for the unterminated bus
normally used in slow, low-power systems. With
a +2.5V supply, the part is guaranteed to drive up to
eight standard loads (for example, 64 other MAX3471s or
56 MAX3471s plus one standard load). Drive capability
increases significantly with supply. For example, with
a +5V supply, the MAX3471 typically meets the RS-485
driver output specifications (1.5V with 54
differential ter-
mination). See the
Typical Operating Characteristics
Reduc ed EMI and Reflec tions
The MAX3471 is slew-rate limited, minimizing EMI and
reducing reflections caused by improperly terminated
cables. In general, the rise time of a transmitter directly
relates to the length of an unterminated stub, which can
be driven with only minor waveform reflections. The fol-
lowing equation expresses this relationship conserva-
tively:
Length = t
RISE
/ (10 x 1.5ns/foot)
where t
RISE
is the transmitter’s rise time.
For example, the MAX3471’s rise time is typically 1.3μs,
which results in excellent waveforms with a stub length
up to 82 feet. In general, systems operate well with
longer unterminated stubs, even with severe reflec-
tions, if the waveform settles out before the UART sam-
ples them.
Driver Output Protec tion
Excessive output current and power dissipation caused
by faults or bus contention are prevented by foldback
current limiting. A foldback current limit on the output
stage provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
Typical Operating Characteristics).
M
1.6μA, RS-485/RS-422, Half-Duplex,
Differential Transceiver for Battery-Powered Systems
_______________________________________________________________________________________
7
Table 1. Transmitting
Table 2. Receiving
INPUTS
DE
1
1
0
0
RE
X
X
0
1
DI
1
0
X
X
A
1
0
Z
D
Z
D
B
0
1
Z
D
Z
D
OUTPUTS
1
0
0
0
0
0
INPUTS
DE
0
RE
0
RO
1
0
1
Z
A-B
≥
-0.05V
≤
-0.45V
Open/Shorted
X
OUTPUT
X = Don’t care
Z = Receiver output high impedance
Figure 1. Driver DC Test Load
S2
1k
C
L
RECEIVER
OUTPUT
V
CC
S1
TEST
POINT
Figure 2. Receiver Enable/Disable Timing Test Load
Z
D
= Driver output disabled
A
R
R
B
V
OD
V
OC
DE
DI
A
B
DRIVER
V
O
V
CC
R
DIFF
C
L1
C
L2
Figure 3. Driver Test Circuit
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| MAX3471EUA+ | 功能描述:RS-422/RS-485 接口 IC 1.6uA Half Duplex Differential Tcvr RoHS:否 制造商:Maxim Integrated 數(shù)據速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3471EUA+T | 功能描述:RS-422/RS-485 接口 IC 1.6uA Half Duplex Differential Tcvr RoHS:否 制造商:Maxim Integrated 數(shù)據速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3471EUA-T | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3480ACPI | 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 數(shù)據速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
| MAX3480ACPI+ | 功能描述:RS-422/RS-485 接口 IC 3.3V Data Interface RoHS:否 制造商:Maxim Integrated 數(shù)據速率:1136 Kbps 工作電源電壓:3 V to 5.5 V 電源電流:5.9 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-28 封裝:Tube |
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