參數(shù)資料
型號(hào)： MAX3490ECSA-T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 3/16頁(yè)
文件大小： 0K
描述： IC TXRX RS485/RS422 10MBPS 8SOIC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： RS422，RS485
電源電壓： 3 V ~ 3.6 V
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOIC
包裝： 帶卷 (TR)
_____________________Function Tables
Devices with Receiver/Driver Enable
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
Table 1. Transmitting
* B and A outputs are Z and Y, respectively, for full-duplex part
(MAX3491E).
X = Don’t care; High-Z = High impedance
Table 2. Receiving
* DE is a “don’t care” (x) for the full-duplex part (MAX3491E).
X = Don’t care; High-Z = High impedance
Devices without Receiver/Driver Enable
(MAX3488E/MAX3490E)
Table 3. Transmitting
Table 4. Receiving
___________Applications Information
The MAX3483E/MAX3485E/MAX3486E/MAX3488E/
MAX3490E/MAX3491E are low-power transceivers for
RS-485 and RS-422 communications. The MAX3483E
and MAX3488E can transmit and receive at data rates
up to 250kbps, the MAX3486E at up to 2.5Mbps, and the
MAX3485E/MAX3490E/MAX3491E at up to 12Mbps. The
MAX3488E/MAX3490E/MAX3491E are full-duplex trans-
ceivers, while the MAX3483E/MAX3485E/MAX3486E are
half-duplex. Driver Enable (DE) and Receiver Enable
(RE) pins are included on the MAX3483E/MAX3485E/
MAX3486E/MAX3491E. When disabled, the driver and
receiver outputs are high impedance.
Reduced EMI and Reflections
(MAX3483E/MAX3486E/MAX3488E)
The MAX3483E/MAX3488E are slew-rate limited, mini-
mizing EMI and reducing reflections caused by improp-
erly terminated cables. Figure 13 shows the driver
output waveform of a MAX3485E/MAX3490E/MAX3491E
transmitting a 125kHz signal, as well as the Fourier
analysis of that waveform. High-frequency harmonics
with large amplitudes are evident. Figure 14 shows the
same information, but for the slew-rate-limited
MAX3483E/MAX3488E transmitting the same signal. The
high-frequency harmonics have much lower amplitudes,
and the potential for EMI is significantly reduced.
Low-Power Shutdown Mode
(MAX3483E/MAX3485E/MAX3486E/MAX3491E)
A low-power shutdown mode is initiated by bringing both
RE high and DE low. The devices will not shut down
unless both the driver and receiver are disabled (high
impedance). In shutdown, the devices typically draw
only 2nA of supply current.
For these devices, the tPSH and tPSL enable times
assume the part was in the low-power shutdown mode;
the tPZH and tPZL enable times assume the receiver or
driver was disabled, but the part was not shut down.
MAX3483E/MAX3485E/MAX3486E/MAX3488E/MAX3490E/MAX3491E
3.3V-Powered, ±15kV ESD-Protected, 12Mbps and
Slew-Rate-Limited True RS-485/RS-422 Transceivers
______________________________________________________________________________________
11
INPUTS
OUTPUTS
RE
DE
DI
B*
A*
MODE
X
1
0
1
Normal
X
1
0
1
0
Normal
0
X
High-Z
Normal
1
0
X
High-Z
Shutdown
INPUTS
RE
DE
A, B
RO
MODE
0
0*
≥ +0.2V
1
Normal
0
0*
≤ -0.2V
0
Normal
0
0*
Inputs Open
1
Normal
1
0
X
High-Z
Shutdown
OUTPUTS
INPUTS
OUTPUT
A, B
RO
≥ +0.2V
1
≤ -0.2V
0
Inputs Open
1
INPUT
OUTPUTS
DI
Z
Y
1
0
1
0
1
0
5MHz
500kHz/div
0
10dB/div
5MHz
500kHz/div
0
10dB/div
Figure 13. Driver Output Waveform and FFT Plot of MAX3485E/
MAX3490E/MAX3491E Transmitting a 125kHz Signal
Figure 14. Driver Output Waveform and FFT Plot of
MAX3483E/ MAX3488E Transmitting a 125kHz Signal
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