参数资料
型号: MAX3042BCWE
厂商: MAXIM INTEGRATED PRODUCTS INC
元件分类: 通用总线功能
英文描述: 【10kV ESD-Protected, Quad 5V RS-485/RS-422 Transmitters
中文描述: QUAD LINE DRIVER, PDSO16
封装: SO-16
文件页数: 10/15页
文件大小: 262K
代理商: MAX3042BCWE
M
required input current. At this time the SR latch resets
and Q1 turns off. When Q1 turns off, EN reverts to a
standard, high-impedance CMOS input. Whenever V
CC
drops below 1V, the hot-swap input is reset.
The EN12 and EN34 input structures are identical to the
EN input. For the
EN
input, there is a complimentary cir-
cuit employing two PMOS devices pulling the
EN
input
to V
CC
.
Hot-Swap Line Transient
The circuit of Figure 10 shows a typical offset termina-
tion used to guarantee a greater than 200mV offset
when a line is not driven. The 50pF represents the mini-
mum parasitic capacitance which would exist in a typi-
cal application. In most cases, more capacitance exists
in the system and will reduce the magnitude of the
glitch. During a
hot-swap
event when the driver is
connected to the line and is powered up, the driver
must not cause the differential signal to drop below
200mV. Figures 11 and 12 show the results of the
MAX3040
MAX3045 during power-up for two different
V
CC
ramp rates (0.1V/μs and 1V/μs). The photos show
the V
CC
ramp, the single-ended signal on each side of
the 100
termination, the differential signal across the
termination, and shows the hot-swap line transient
stays above the 200mV RS-485 specification.
Operation of Enable Pins
The MAX3040
MAX3045 family has two enable-func-
tional versions:
The MAX3040/MAX3041/MAX3042B have two transmit-
ter enable inputs EN12 and EN34. EN12 controls the
transmitters 1 and 2, and EN34 controls transmitters 3
and 4. EN12 and EN34 are active-high and the part will
enter the low-power shutdown mode when both are
pulled low. The transmitter outputs are high impedance
when disabled (Table 2).
The MAX3043/MAX3044/MAX3045B have two transmit-
ter enable inputs EN and
EN
, which are active-high and
active-low, respectively. When EN is logic high or
EN
is
logic low all transmitters are active. When EN is pulled
low and
EN
is driven high, all transmitters are disabled
and the part enters the low-power shutdown mode. The
transmitter outputs are high impedance when disabled
(Table 3).
Applications Information
Typical Applications
The MAX3040
MAX3045 offer optimum performance
when used with the MAX3093E/MAX3095 5V quad
receivers or MAX3094E/MAX3096 3V quad differential
line receivers. Figure 13 shows a typical RS-485 con-
nection for transmitting and receiving data and Figure
14 shows a typical multi-point connection.
±10kV ESD-Protected, Quad 5V RS-485/RS-422
Transmitters
10
______________________________________________________________________________________
V
CC
TIMER
TIMER
EN
EN
(HOT SWAP)
10
μ
s
85
μ
A
Q1
Q2
5.6k
700
μ
A
Figure 9. Simplified Structure of the Driver Enable Pin (EN)
相关PDF资料
PDF描述
MAX3040 Fixed-Point Digital Signal Processor 376-BGA
MAX3040CSE 【10kV ESD-Protected, Quad 5V RS-485/RS-422 Transmitters
MAX3040CWE 【10kV ESD-Protected, Quad 5V RS-485/RS-422 Transmitters
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相关代理商/技术参数
参数描述
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MAX3042BCWE+G126 功能描述:RS-422/RS-485 接口 IC +/-10kV ESD-Protected Quad 5V RS-485/422 Transmitters RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube
MAX3042BCWE+T 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube
MAX3042BCWE+TG126 功能描述:RS-422/RS-485 接口 IC 10kV ESD-Protected Quad 5V RS-485/RS-422 Transmitters RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube
MAX3042BCWE-T 功能描述:RS-422/RS-485 接口 IC RoHS:否 制造商:Maxim Integrated 数据速率:1136 Kbps 工作电源电压:3 V to 5.5 V 电源电流:5.9 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-28 封装:Tube