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參數(shù)資料
| 型號(hào)： | SP504MCM-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 8/32頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX WAN MULTI-MODE 80LQFP |
| 標(biāo)準(zhǔn)包裝： | 84 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 7/7 |
| 規(guī)程： | 多協(xié)議 |
| 電源電壓： | 5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 80-LQFP |
| 供應(yīng)商設(shè)備封裝： | 80-LQFP（14x14） |
| 包裝： | 托盤 |
| 其它名稱： | 1016-1682 SP504MCM-L-ND |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP504_02_2708
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP504_02_2708
Since both V
DD and VSS are separately gen-
erated from V
CC in a no–load condition, VDD
and V
SS 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 5kHz. The external capacitors
must be a minimum of 22F with a 6V
breakdown rating.
External Power Supplies
For applications that do not require +5V only,
externalsuppliescanbeappliedattheV+and
V– pins.The value of the external supply volt-
ages must be no greater than ±l0.5V.The tol-
eranceshouldbe±5%from±0V.Thecurrent
drain for the supplies is used for RS-232 and
RS-423 drivers. For the RS-232 driver,
the current requirement will be 3.5mA per
driver. The RS-423 driver worst case cur-
rent drain will be mA per driver. Power
sequencing is required for the
SP504. The
supplies must be sequenced accordingly:
+0V, +5V and –0V. An external circuit
would be needed for proper power supply
sequencing. Consult factory for application
circuitry.
Drivers
The
SP504 has seven (7) enhanced in-
dependent 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 posi-
tion and functionality of the drivers are set
up to accommodate the selected interface
mode.As the mode ofthe drivers is changed,
the electrical characteristics will change to
support the requirements of clock, data, and
control line signal levels. Table 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 20kbps.
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
signals with a minimum voltage output of
±3.6V (with 450 loading) and can operate
up to 20kbps. Open circuit V
OL and VOH
measurements 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.
Thethirdtypeofdriverproducesadifferential
signal that can maintain RS-485, ±.5V dif-
ferential 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.) requirements
of ±2V differential output levels with 100
loads. The RS-422 drivers are used in RS-
449, EIA-530, EIA-530Aand V.36 modes as
Category I signals 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 requirements 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 transparent
when the decoder is in all other modes. All
of the differential drivers; RS-485, RS-422,
and V.35, can operate up to 0Mbps.
The driver inputs are both TTL or CMOS
compatible. 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.
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相關(guān)代理商/技術(shù)參數(shù) |
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