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參數(shù)資料
| 型號： | SP503CM-L |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 27/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX MULTIPROTOCOL 80LQFP |
| 標(biāo)準(zhǔn)包裝： | 84 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/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 |
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SP503_101_101508
SP503 Multiprotocol Transceiver
Copyright 2008 Exar Corporation
8
Pin 32 — V
SS –10V Charge Pump Capacitor —
Connects from ground to V
SS.
Suggested ca-
pacitor size is 22F, 16V.
Pins 26 and 30 — C
1
+ and C
1
– — Charge Pump
Capacitor — Connects from C
1
+ to C
1
–. Sug-
gested capacitor size is 22F, 16V.
Pins 28 and 31 — C
2
+ and C
2
– — Charge Pump
Capacitor — Connects from C
2
+ to C
2
–. Sug-
gested capacitor size is 22F, 16V.
NOTE: NC pins should be left floating; internal
signals may be present.
pared to older less–efficient designs. The charge
pump still requires four external capacitors, but
uses a four–phase voltage shifting technique to
attain symmetrical 10V power supplies. Figure
3(a) shows the waveform found on the positive
side of capcitor C2, and Figure 3(b) shows the
negative side of capcitor C2. There is a free–
running oscillator that controls the four phases
of the voltage shifting. A description of each
phase follows.
Phase 1
— V
SS charge storage —During this phase of
the clock cycle, the positive side of capacitors
C
1 and C2 are initially charged to +5V. Cl
+ is
then switched to ground and the charge on C
1
–
is transferred to C
2
–. Since C
2
+ is connected to
+5V, the voltage potential across capacitor C
2
is now 10V.
Phase 2
— V
SS transfer — Phase two of the clock con-
nects the negative terminal of C
2 to the VSS
storage capacitor and the positive terminal of C
2
to ground, and transfers the generated –l0V to
C
3. Simultaneously, the positive side of capaci-
tor C
1 is switched to +5V and the negative side
is connected to ground.
Phase 3
— V
DD charge storage — The third phase of the
clock is identical to the first phase — the charge
transferred in C
1 produces –5V in the negative
terminal of C
1, which is applied to the negative
side of capacitor C
2. Since C2
+ is at +5V, the
voltage potential across C
2 is l0V.
Phase 4
— V
DD transfer — The fourth phase of the
clock connects the negative terminal of C
2 to
ground and transfers the generated l0V across
C
2 to C4, the VDD storage capacitor. Again,
FEATURES…
The SP503 is a highly integrated serial trans-
ceiver that allows software control of its inter-
face modes. The SP503 offers hardware inter-
face modes for RS-232 (V.28), RS-422A (V.11),
RS-449, RS-485, V.35, and EIA-530. The inter-
face mode selection is done via an 8–bit switch;
four (4) bits control the drivers and four (4) bits
control the receivers. The SP503 is fabricated
using low–power BiCMOS process technol-
ogy, and incorporates an Exar patented
(5,306,954) charge pump allowing +5V only
operation. Each device is packaged in an 80–pin
Quad FlatPack package.
The SP503 is ideally suited for wide area net-
work connectivity based on the interface modes
offered
and
the
driver
and
receiver
configurations. The SP503 has seven (7)
independent drivers and seven (7) independent
receivers. The seventh driver of the SP503
allows it to support applications which require
two separate clock outputs making it ideal for
DCE applications.
THEORY OF OPERATION
The SP503 is made up of four separate circuit
blocks — the charge pump, drivers, receivers,
and decoder. Each of these circuit blocks is
described in more detail below.
Charge–Pump
The charge pump is an Exar patented design
(5,306,954) and uses a unique approach com-
VCC = +5V
–5V
+5V
VSS Storage Capacitor
VDD Storage Capacitor
C1
C2
C3
C4
+
++
–
Figure 1. Charge Pump Phase 1.
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|---|---|
| SP503EB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Application Note |
| SP503EF | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Multiprotocol Transceiver |
| SP503EF-L | 制造商:Exar Corporation 功能描述:IC TRANSCEIVER MULTI MODE MQFP80 制造商:Exar Corporation 功能描述:IC, TRANSCEIVER, MULTI MODE, MQFP80 |
| SP503EM | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Multiprotocol Transceiver |
| SP503EM-L | 功能描述:總線收發(fā)器 Full Duplex RS-485 s 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 |
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