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參數(shù)資料
| 型號： | MAX4819 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Bandwidth T1/E1 Dual-SPDT Switches/4:1 Muxes |
| 中文描述： | 寬帶T1/E1、雙路SPDT開關(guān)/4:1復(fù)用器 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 1367K |
| 代理商： | MAX4819 |
M
High-Bandwidth T1/E1 Dual-SPDT Switches/
4:1 Muxes
12
______________________________________________________________________________________
Fault Protection
The fault protection of the MAX4818/MAX4819 allows
the devices to handle input signals of more than twice
the supply voltage without clamping the signal, latching
up, or disturbing other cards in the system. The device
detects when the input voltage drops below the nega-
tive supply. As soon as a fault condition is detected,
the switch is immediately turned off for 128 clock
cycles (typically 128μs). At the end of the 128μs time-
out, the switch is turned back on for one clock cycle. At
the end of the one clock cycle, if the signal is within the
operating range, the switch will remain on. Otherwise,
the device will turn the switch off again for 128 clock
cycles. This will repeat until the signal is within the
operating range. In T1/E1 redundancy applications, this
can happen when the load resistor (RL) is removed or
disconnected for any reason, as shown in Figure 1.
Without a load resistor, the output voltage when using a
1:2 transformer can be as high as ±11V.
Hot Insertion
The MAX4818/MAX4819 tolerate hot insertions, thus
are not damaged when inserted into a live backplane.
Competing devices can exhibit low impedance when
plugged into a live backplane that can cause high
power dissipation leading to damage of the device
itself. The MAX4818/MAX4819 have relatively high
input impedance when V+ and V- supplies are uncon-
nected or connected to GND. Therefore, the devices
are not destroyed by a hot insertion. In order to guar-
rantee data integrity, the V+ and V- supplies must be
properly biased.
Applications Information
T1/E1 N+1 Redundancy
Figures 6, 7, and 8 show a basic architecture for twisted-
pair interface (120
, E1 or 100
, T1). Coaxial cable inter-
face (75
, E1) can be illustrated with the same figures
but without the single-ended to differential conversion
stage. A single protection card can replace up to
N line cards in a N+1 redundancy scheme. Figure 6
shows the switches sitting in the line cards where they
can reroute any of the input/output signals to a protection
line card. Figure 7 shows a “multiplexed” redundancy
architecture using the MAX4819 where the multiplexers
are in the line cards. This architecture is more scalable as
the number of boards is increased. It also does not
require a dedicated external switching card as the multi-
plexers reside in the line cards themselves. The number
of signals routed through the backplane is substantially
higher than in the switching-card architecture. Figure 8
shows a similar architecture, but the multiplexers reside in
the protection switching card. These figures do not show
the surge-protection elements and resistors for line termi-
nation/impedance matching.
MAX4818
MAX4819
5V
±
10%
LIU
Tx
TRING
TTIP
10V
±
10%
1:2
+
Vo
-
RL
NO
COM
Figure 1. Fault Protection
EN
0
1
1
1
SET
X
0
0
1
IN_
X
0
1
X
COM_ CONNECTION
NONE
NC_
NO_
NO_
Table 1. Dual SPDT Truth Table
(MAX4818)
(X = don’t care.)
EN
0
1
1
1
1
1
SET
X
0
0
0
0
1
A1
X
0
0
1
1
X
A0
X
0
1
0
1
X
COM CONNECTION
NONE
NO1
NO2
NO3
NO4
NO1, NO2, NO3, NO4
Table 2. 4:1 Multiplexer Truth Table
(MAX4819)
(X = don’t care.)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4819ETE | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX4819ETE+ | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX4819ETE-T | 制造商:Maxim Integrated Products 功能描述:HIGH-BANDWIDTH T1/E1 DUAL-SPDT SWIT - Tape and Reel |
| MAX4819EUE | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
| MAX4819EUE+ | 功能描述:多路器開關(guān) IC RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 開關(guān)數(shù)量:4 開啟電阻（最大值）:7 Ohms 開啟時間（最大值）: 關(guān)閉時間（最大值）: 傳播延遲時間:0.25 ns 工作電源電壓:2.3 V to 3.6 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UQFN-16 |
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