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| 型號： | HS-26C(T)32RH |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 35K |
| 代理商： | HS-26C(T)32RH |
4-1
www.intersil.com or 407-727-9207
|
Copyright
Intersil Corporation 1999
Using the HS-26C(T)32RH Radiation Hardened
RS-422 Line Receiver
Description
The HS-26C(T)32RH is a radiation hardened RS-422 line
receiver which is pin and functional compatible with commer-
cial 2632 types. The HS-26C32RH has CMOS enable pin
input levels and the HS-26CT32RH accepts TTL-level
enable signals. The two circuits are identical except for the
configuration of the logic input buffers.
has the same input characteristics (impedance, hysteresis,
failsafe) as commercial types.
The HS-26C32RH
Pinout
HS-26C(T)32RH
Line Input Characteristics
The HS-26C(T)32RH presents a resistive impedance of
approximately 10k
to the line. This impedance is the
composite of the input divider network. No protection
devices are present on the line side; there are internal
protection devices at the inner end of the input resistor but
these do not become active under normal power up or down
conditions.
The input network is fully isolated from the substrate. There
are no parasitic junctions. When the device is powered off
the input remains at 10k
.
The line inputs allow current to be fed from the line into
device power and VDD rails. However this current is not
enough to activate the device with VDD off or open; under
worst case conditions with both inputs at 5V, the VDD rail
will power up to less than 400mV and the output will remain
high impedance (off). There is no possibility of the line
providing sufficient supply voltage top activate the ’32 or
attached logic.
Figure 1 is the schematic of the HS-26C(T)32RH input
structure.
FIGURE 1. HS-26C(T)32RH LINE INPUT STRUCTURE
Cross-Strapping
In space systems it is vital to have a data communications
bus structure which provides resistance to single point
failures. One common technique is the use of redundant bus
drivers and receivers in parallel, sometimes called cross-
strapping. In this arrangement one driver and receiver are
active and another pair is quiescent. The desire to minimize
power leads to the need to power down the redundant
circuits. This poses a problem for typical CMOS output
structures and input protection circuits. The parasitic diodes
in the P-channel output drivers and the input clamp diodes
will tend to clamp the signal unless the supply voltage to the
quiescent parts remains above the bus signal range (see
Figure 2).
The HS-26C(T)31RH transmitter provides RS-422-compliant
output characteristics, including power-off isolation. The out-
put stage presents a high impedance to the line with power
off (VDD < 3V). This prevents any significant amount of cur-
rent flow over an output voltage range of 0.25V to 6V with
respect to device ground.
The use of a BiCMOS output stage provides an output char-
acteristic very similar to LSTTL devices and superior to stan-
dard CMOS. The illustration show the four standard output
topologies. The NPN, NMOS, and PMOS physical structures
look like.
The standard P-well CMOS structure presents an undesir-
able characteristic to the line when the supply is at 0V. This
is due to the P-channel driver’s parasitic drain-body diode,
which becomes forward-biased at voltages above ground.
14
15
16
9
13
12
11
10
1
2
3
4
5
7
6
8
AIN
AIN
AOUT
ENABLE
COUT
CIN
GND
CIN
VDD
BIN
BOUT
ENABLE
DOUT
DIN
DIN
BIN
VDD
GND
R5
R0
42K
DIODE
DIODE
D6
D7
R3
2.24K
R4
2.8K
IN+
10.6K
VDD
GND
R12
10.6K
R17
42K
DIODE
DIODE
D11
D16
R16
2.24K
R15
2.8K
IN-
GND
Application Note
August 1995
AN9520
Author: Jim Swonger
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| HS1-26CLV31RH-8 | Radiation Hardened 3.3V Quad Differential Line Driver |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HS-26CT32RH-T | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Radiation Hardened Quad Differential Line Receiver |
| HS27 | 功能描述:散熱片 Heatsink, PSIP RoHS:否 制造商:Ampro By ADLINK 產(chǎn)品:Heat Sink Accessories 安裝風(fēng)格:Through Hole 散熱片材料: 散熱片樣式: 熱阻: 長度: 寬度: 高度: 設(shè)計目的:Express-HRR |
| HS-2700RH | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power, High Performance Radiation Hardened Operational Amplifier |
| HS271 | 功能描述:散熱片 2.7 C/W PM Heat Sink 1 SSR RoHS:否 制造商:Ampro By ADLINK 產(chǎn)品:Heat Sink Accessories 安裝風(fēng)格:Through Hole 散熱片材料: 散熱片樣式: 熱阻: 長度: 寬度: 高度: 設(shè)計目的:Express-HRR |
| HS271DR | 功能描述:散熱片 2.7 C/W DIN RM Heat Sink - 1 SSR RoHS:否 制造商:Ampro By ADLINK 產(chǎn)品:Heat Sink Accessories 安裝風(fēng)格:Through Hole 散熱片材料: 散熱片樣式: 熱阻: 長度: 寬度: 高度: 設(shè)計目的:Express-HRR |
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