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| 型號(hào)： | SP504EB |
| 英文描述： | Evaluation Board Manual |
| 中文描述： | 評(píng)估板手冊(cè) |
| 文件頁(yè)數(shù)： | 15/31頁(yè) |
| 文件大?。?/td> | 257K |
| 代理商： | SP504EB |
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15
Rev: A Date:1/27/04
SP504 Multi–Mode Serial Transceivers
Copyright 2004 Sipex Corporation
The RS-232 drivers are used in RS-232 mode
for all signals, and also in V.35 mode where they
are used as the control line signals such as DTR
and RTS.
The RS-423 drivers are also single–ended sig-
nals with a minimum voltage output of
±
3.6V
(with 450
loading) and can operate up to
120kbps. Open circuit V
and V
measure-
ments are
±
4.0V to
±
6.0V. The RS-423 drivers
are used in RS-449, EIA-530, EIA-530A and
V.36 modes as Category II signals from each of
their corresponding specifications.
The third type of driver produces a differential
signal that can maintain RS-485,
±
1.5V differ-
ential output levels with a worst case load of
54
. The signal levels and drive capability of
the RS-485 drivers allow the drivers to also
support RS-422 (V.11) requirements of
±
2V
differential output levels with 100
loads. The
RS-422 drivers are used in RS-449, EIA-530,
EIA-530A and V.36 modes as Category I sig-
nals which are used for clock and data.
The fourth type of driver is the V.35 driver.
V.35 levels require
±
0.55V driver output sig-
nals with a load of 100
. The
SP504
drivers
simplify existing V.35 implementations that use
external termination schemes. The drivers were
specifically designed to comply with the re-
quirements of V.35 as well as the driver output
impedance values of V.35. The drivers achieve
the 50
to 150
source impedance. However,
an external 150
resistor to ground must be
connected to the non-inverting outputs; SD(b),
ST(b), and TT(b), in order to comply with the
135
to 165
short-circuit impedance for V.35.
The V.35 driver itself is disabled and transpar-
ent when the decoder is in all other modes. All
of the differential drivers; RS-485, RS-422, and
V.35, can operate up to 10Mbps.
The driver inputs are both TTL or CMOS com-
patible. Since there are no pull-up or pull-down
resistors on the driver inputs, they should be tied
to a known logic state in order to define the
driver output.
Since both V
DD
and V
are separately gener-
ated from V
in a no–load condition, V
and
V
will be symmetrical. Older charge pump
approaches that generate V
–
from V
+
will show
a decrease in the magnitude of V
–
compared to
V
+
due to the inherent inefficiencies in the
design.
The clock rate for the charge pump typically
operates at 15kHz. The external capacitors must
be a minimum of 22
μ
F with a 16V breakdown
rating.
External Power Supplies
For applications that do not require +5V only,
external supplies can be applied at the V+ and
V
–
pins. The value of the external supply volt-
ages must be no greater than
±
l0.5V. The toler-
ance should be
±
5% from
±
10V. The current
drain for the supplies is used for RS-232 and
RS-423 drivers. For the RS-232 driver, the cur-
rent requirement will be 3.5mA per driver. The
RS-423 driver worst case current drain will be
11mA per driver. Power sequencing is required
for the
SP504
. The supplies must be sequenced
accordingly: +10V, +5V and –10V. An external
circuit would be needed for proper power sup-
ply sequencing. Consult factory for application
circuitry.
Drivers
The
SP504
has seven (7) enhanced independent
drivers. Control for the mode selection is done
via a four–bit control word. The drivers are pre-
arranged such that for each mode of operation,
the relative position and functionality of the
drivers are set up to accommodate the selected
interface mode. As the mode of the drivers is
changed, the electrical characteristics will change
to support the requirements of clock, data, and
control line signal levels.
Table 1
shows the
mode of each driver in the different interface
modes that can be selected.
There are four basic types of driver circuits —
RS-232, RS-423, RS-485 and V.35.
The RS-232 drivers output single–ended signals
with a minimum of
±
5V (with 3k
and 2500pF
loading), and can operate up to 120kbps.
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PDF描述 |
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| SP504MCF | WAN Multi-Mode Serial Transceiver |
| SP505 | WAN Multi-Mode Serial Transceiver |
| SP505AB | WAN Multi-Mode Serial Transceiver |
| SP505ACF | WAN Multi-Mode Serial Transceiver |
| SP505ACM | WAN Multi-Mode Serial Transceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP50-4G | 制造商:Aavid Thermalloy 功能描述: |
| SP504MCF | 制造商:Exar Corporation 功能描述: 制造商:Exar Corporation 功能描述:Line Transceiver, 7-Driver, 7-Receiver, 80 Pin, Plastic, QFP |
| SP504MCF-L | 制造商:Exar Corporation 功能描述:TRANSCEIVER MULTIPROTOCOL SERIAL 制造商:Exar Corporation 功能描述:IC, WAN MULTIMODE SERIAL TXRX, MQFP-80; Device Type:Transceiver; IC Interface Type:RS232, RS422, RS449, RS485, EIA530, EIA530A; No. of Drivers:7; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Driver Case Style:MQFP ;RoHS Compliant: Yes |
| SP504MCM-L | 功能描述:總線收發(fā)器 WAN Multi-Mode Serial RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| SP504MCM-L/TR | 功能描述:LIN 收發(fā)器 WAN Multi-Mode Serial Transceiver RoHS:否 制造商:NXP Semiconductors 工作電源電壓: 電源電流: 最大工作溫度: 封裝 / 箱體:SO-8 |
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