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參數資料
| 型號： | SP505EK |
| 英文描述： | Multi-Protocol Serial Transceivers |
| 中文描述： | 多協(xié)議串行收發(fā)器 |
| 文件頁數： | 18/35頁 |
| 文件大?。?/td> | 495K |
| 代理商： | SP505EK |
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18
Rev: A Date: 1/27/04
SP505 Multi–Mode Serial Transceiver
Copyright 2004 Sipex Corporation
A typical +10V charge pump would require
external clamping such as 5V zener diodes on
V
and V
to ground. The +5V output has
symmetrical levels as in the +10V output. The
+5V is used in the following modes where RS-
423 (V.10) are used: RS-449, EIA-530, EIA-
530A and V.36.
Phase 1 (±10V)
— V
charge storage — During this phase of
the clock cycle, the positive side of capacitors
C
and C
are initially charged to +5V. C
l
then switched to ground and the charge on C
transferred to C
+5V, the voltage potential across capacitor C
2
is
now 10V.
+
is
–
is
–
. Since C
+
is connected to
Phase 1 (±5V)
— V
& V
charge storage and transfer —
With the C
1
and C
capacitors initially charged
to +5V, C
charge on C
capacitor. Simultaneously the C
ground and 5V charge on C
2
the V
DD
storage capacitor.
+
is then switched to ground and the
–
is transferred to the V
storage
–
is switched to
+
is transferred to
FEATURES…
The
SP505
is a highly integrated serial trans-
ceiver that allows software control of its inter-
face modes. Similar to the SP504, the
SP505
offers the same hardware interface modes for
RS-232 (V.28), RS-422A (V.11), RS-449, RS-
485, V.35, EIA-530 and includes V.36 and EIA-
530A. The interface mode selection is done via
a 4–bit switch for the drivers and receivers. The
SP505
is fabricated using low–power BiCMOS
process technology, and incorporates a
Sipex
–
patented (5,306,954) charge pump allowing +5V
only operation. Each device is packaged in an
80–pin JEDEC Quad FlatPack package.
The
SP505
is ideally suited for wide area net-
work connectivity based on the interface modes
offered and the driver and receiver configura-
tions. The
SP505
has seven (7) independent
drivers and seven (7) independent receivers. In
V.35 mode, the
SP505
includes the necessary
components and termination resistors internal
within the device for compliant V.35 operation.
THEORY OF OPERATION
The
SP505
is made up of five separate circuit
blocks — the charge pump, drivers, receivers,
decoder and switching array. Each of these
circuit blocks is described in more detail below.
Charge–Pump
The
SP505
charge pump is based on the SP504
design where
Sipex's
patented charge pump
design (5,306,954) uses a four–phase voltage
shifting technique to attain symmetrical 10V
power supplies. The charge pump still requires
external capacitors to store the charge. In addi-
tion the SP504 charge pump supplies +10V or
+5V on V
and V
depending on the mode of
operation. There is a free–running oscillator
that controls the four phases of the voltage
shifting. A description of each phase follows.
The
SP505
charge pump is used for RS-232
where the output voltage swing is typically
+10V and also used for RS-423. However, RS-
423 requires the voltage swing on the driver
output be between +4V to +6V during an open-
circuit (no load). The charge pump would need
to be regulated down from +10V to +5V.
V
CC
= +5V
–5V
–5V
+5V
V
DD
Storage Capacitor
C
1
C
2
C
4
+
+
+
–
–
–
V
SS
Storage Capacitor
C
3
+
–
Figure 46. Charge Pump Phase 1 for +5V.
V
CC
= +5V
+5V
V
DD
Storage Capacitor
C
1
C
2
C
4
+
+
+
–
–
–
V
SS
Storage Capacitor
C
3
+
–
–5V
Figure 45. Charge Pump Phase 1 for +10V.
相關PDF資料 |
PDF描述 |
|---|---|
| SP505RB | Multi-Protocol Serial Transceivers |
| SP506 | 5V, Single Chip WAN Multi-Mode Serial Transceiver |
| SP506CF | 5V, Single Chip WAN Multi-Mode Serial Transceiver |
| SP506EB | Multi-Protocol Serial Transceivers |
| SP506EK | Multi-Protocol Serial Transceivers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SP505P | 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:LIQUID CRYSTAL DISPLAYS(STANDARD PRODUCTS) |
| SP505RB | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Multi-Protocol Serial Transceivers |
| SP506 | 制造商:EXAR 制造商全稱:EXAR 功能描述:5V Single Chip WAN Multi-Mode Serial Transceiver |
| SP506CF | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:5V, Single Chip WAN Multi-Mode Serial Transceiver |
| SP506CF-L | 制造商:Exar 功能描述:Transceiver WAN Multi-Mode 20Mbps MQFP80 |
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