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| 型号： | MAX3062EEKA#TG16 |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/17页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS485/422 SGL SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS422，RS485 |
| 电源电压： | 4.75 V ~ 5.25 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 标准包装 |
| 其它名称： | MAX3062EEKA#TG16DKR |
MAX3060E/MAX3061E/MAX3062E
±15kV ESD-Protected, Fail-Safe, 20Mbps, Slew-Rate-
Limited RS-485/RS-422 Transceivers in a SOT
14
______________________________________________________________________________________
ESD Test Conditions
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 15a shows the Human Body Model, and Figure
15b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the device through a
1.5k
Ω resistor.
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits.
The main difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2. Because series resistance is
lower in the IEC 1000-4-2 ESD test model (Figure 16), the
ESD withstand voltage measured to this standard is gen-
erally lower than that measured using the Human Body
Model. The Air-Gap test involves approaching the
device with a charged probe. The Contact Discharge
method connects the probe to the device before the
probe is energized.
Machine Model
The Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing
and assembly. All pins (not just RS-485 inputs) require
this protection during manufacturing. Therefore, the
Machine Model is less relevant to the I/O ports than are
the Human Body Model and IEC 1000-4-2.
Applications Information
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12k
Ω
(one-unit load), and the standard driver can drive up to
32-unit loads. The MAX3060E family of transceivers have
a 1/8-unit-load receiver input impedance (96k
Ω), allow-
ing up to 256 transceivers to be connected in parallel on
one communication line. Any combination of these
devices and/or other RS-485 transceivers with a total of
32 unit loads or less can be connected to the line.
Reduced EMI and Reflections
The MAX3060E and MAX3061E are slew-rate limited,
minimizing EMI and reducing reflections caused by
improperly terminated cables. Figure 17 shows the dri-
ver output waveform and its Fourier analysis of a 25kHz
signal transmitted by a MAX3062E. High-frequency
harmonic components with large amplitudes are evi-
dent. Figure 18 shows the same signal displayed for a
MAX3061E transmitting under the same conditions.
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
1M
Ω
RD
1.5k
Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 15a. Human Body ESD Test Model
IP 100%
90%
36.8%
tRL
TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
AMPERES
Figure 15b. Human Body Current Waveform
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC
50M
Ω to 100MΩ
RD
330
Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 16. IEC 1000-4-2 ESD Test Model
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