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參數資料
| 型號： | MAX3171 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數： | 9/15頁 |
| 文件大?。?/td> | 271K |
| 代理商： | MAX3171 |
M
+3.3V Multiprotocol 3Tx/3Rx
Software-Selectable Control Transceiver
_______________________________________________________________________________________
9
No-Cable Mode
The MAX3171/MAX3173 enter no-cable mode when the
mode select pins are left unconnected or tied HIGH
(M0 = M1 = M2 = 1). In this mode, the multiprotocol dri-
vers and receivers are disabled and the supply current
is less than 8mA. The receiver outputs enter a high-
impedance state in no-cable mode, which allows these
output lines to be shared with other receivers (the
receiver outputs have an internal pullup resistor to pull
the outputs HIGH if not driven). Also, in no-cable mode,
the transmitter outputs enter a high-impedance state,
so these output lines can be shared with other devices.
Dual Charge-Pump Voltage Converter
The MAX3171/MAX3173 internal power supply consists
of a regulated dual charge pump that provides positive
and negative output voltages from a +3.3V supply. The
charge pump operates in discontinuous mode: If the out-
put voltage is less than the regulated voltage, the charge
pump is enabled; if the output voltage exceeds the regu-
lated voltage, the charge pump is disabled. Each charge
pump requires a flying capacitor (C1, C2) and a reser-
voir capacitor (C3, C4) to generate the V+ and V- sup-
plies. See Figure 5 for charge-pump connections.
The charge pump is designed to supply V+ and V-
power to the MAX3172/MAX3174 in addition to the
MAX3171/MAX3173 internal transceivers. Connect the
MAX3172/MAX3174 V+ and V- terminals to the
MAX3171/MAX3173 V+ and V- terminals, respectively.
Fail-Safe
The MAX3171/MAX3173 guarantee a logic HIGH
receiver output when the receiver inputs are shorted or
open, or when they are connected to a terminated
transmission line with drivers disabled. The V.11 receiv-
er threshold is set between -25mV and -200mV to guar-
antee fail-safe operation. If the differential receiver input
voltage (B - A) is
≥
-25mV, R_OUT is logic HIGH. In the
case of a terminated bus with all transmitters disabled,
the receiver
’
s differential input voltage is pulled to 0 by
the termination. With the MAX3171/MAX3173 receiver
thresholds, this results in R_OUT logic HIGH with a
25mV (min) noise margin.
The V.10 receiver threshold is set between +25mV and
+300mV. If the V.10 receiver input voltage is
≤
+25mV,
ROUT is logic HIGH. The V.28 receiver threshold is set
between 0.8V and 2.0V. If the receiver input voltage is
≤
0.8V, ROUT is logic HIGH. In the case of a terminated
bus with transmitters disabled, the V.10/V.28 receiver
’
s
input voltage is pulled to ground by the termination.
With the MAX3172/MAX3174 receiver thresholds, this
results in R_OUT logic HIGH.
Applications Information
Capacitor Selection
The capacitors used for the charge pumps, as well as
the supply bypassing, should have a low-ESR and low-
temperature coefficient. Multilayer ceramic capacitors
with an X7R dielectric offer the best combination of per-
formance, size, and cost. The flying capacitors (C1,
C2) should have a value of 1μF, while the reservoir
capacitors (C3, C4) and bypass capacitor (C5) should
have a minimum value of 3.3μF (Figure 5). To reduce
the ripple present on the transmitter outputs, capacitors
C3, C4, and C5 can be increased. Do not increase the
value of C1 and C2.
Local Loopback Control Signal
For applications that require the use of local loopback
(LL) signal routing, an extra transceiver is available for
use on the MAX3172/MAX3174 multiprotocol termina-
tion network device.
Cable-Selectable Mode
Figure 6 shows a cable-selectable mulitprotocol inter-
face. The mode control lines (M0, M1, M2, and
DCE/
DTE
) are wired to the DB-25 connector. To select
the serial interface mode, the appropriate combinations
of M0, M1, M2, and DCE/
DTE
are grounded within the
cable wiring. The control lines that are not grounded
are pulled high by the internal pullups on the MAX3170.
The serial interface protocol of the MAX3171/MAX3173
(MAX3170 and MAX3172/MAX3174) is now selected
based on the cable connected to the DB-25 interface.
V.11 (RS-422) Interface
As shown in Figure 7, the V.11 protocol is a fully bal-
anced differential interface. The V.11 driver generates
±2V (min) between nodes A and B when 100
(min)
resistance is presented at the load. The V.11 receiver is
sensitive to ±200mV differential signals at the receiver
inputs A
’
and B
’
. The V.11 receiver input must comply
with the impedance curve of Figure 8 and reject com-
mon-mode signals up to ±7V developed across the
cable (referenced from C to C
’
in Figure 7).
The MAX3171/MAX3173 V.11 mode receiver has a dif-
ferential threshold between -200mV and -25mV to
ensure that the receiver has proper fail-safe operation
(see
Fail-Safe
). To aid in rejecting system noise, the
MAX3171/MAX3173 V.11 receiver has a 15mV (typ)
hysteresis. Switch S3 in Figure 9 is open in V.11 mode
to disable the V.28 5k
termination at the inverting
receiver input. Because the control signals are slow
(64kbps), 100
termination resistance is generally not
required for the MAX3171/MAX3173.
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相關代理商/技術參數 |
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| MAX3171CAI | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX3171CAI+ | 功能描述:接口 - 專用 3.3V 3Tx/3Rx Tcvr Multiprotocol RoHS:否 制造商:Texas Instruments 產品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| MAX3171CAI+T | 功能描述:接口 - 專用 3.3V 3Tx/3Rx Tcvr Multiprotocol RoHS:否 制造商:Texas Instruments 產品類型:1080p60 Image Sensor Receiver 工作電源電壓:1.8 V 電源電流:89 mA 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:BGA-59 |
| MAX3171CAI-T | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數據速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| MAX31722MUA+ | 功能描述:板上安裝溫度傳感器 SPI/3-Wire Digital Temp Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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