- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄96819 > SK10E445PJ 10E SERIES, 4-BIT RIGHT SERIAL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PQCC28 PDF資料下載
參數(shù)資料
| 型號： | SK10E445PJ |
| 元件分類： | 計數(shù)移位寄存器 |
| 英文描述： | 10E SERIES, 4-BIT RIGHT SERIAL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 146K |
| 代理商： | SK10E445PJ |
7
www.semtech.com
HIGH-PER.ORMANCE PRODUCTS
Revision 2/April 10, 2002
SK10/100E445
Application Information
The SK10/100E445 is an integrated 4-bit serial-to-
parallel data converter. The chip is designed to work
with the On Semi’s E446 device to provide both
transmission and receiving of a high speed serial data
path.
The E445 can convert up to a 2.0 GB/s NRZ
data stream into 4-bit parallel data. The device also
provides a divide by four clock output to be used to
synchronize the parallel data with the rest of the
system.
The E445 features multiplexed dual serial inputs to
provide test loop capability when used in conjunction
with the E446.
Figure 1 illustrates the loop test
architecture. The architecture allows for the electrical
testing of the link without requiring actual transmission
over the serial data path medium. The SINA serial input
of the E445 has an extra buffer delay and should be
used as the loopback serial input.
Figure 1. Loopback Test Architecture
The E445 features a differential serial output and a divide
by 8 clock output to facilitate the cascading of two devices
to build a 1:8 demultiplexer.
Figure 2 illustrates the
architecture for a 1:8 demultiplexer using two E445’s;
the timing diagram for this configuration can be found
on the following page in Figure 5.
Notice the serial
outputs (SOUT) of the lower order converter feed the
serial inputs of the higher order device.
This feed-
through of the serial inputs bounds the upper end of
the frequency of operation. The clock to serial output
propagation delay plus the setup time of the serial
input pins must fit into a single clock period for the
cascade architecture to function properly.
Using the
worst case values for these two parameters from the
datasheet, TPD CLK to SOUT = 1150 ps and tS for
SIN = –100 ps, yields a minimum period of 1050 ps
or a clock frequency of 950 MHz.
The clock frequency is significantly lower than that of
a single converter.
To increase this frequency, some
games can be played with the clock input of the higher
order E445. By delaying the clock feeding the second
E445 relative to the clock of the first E445, the
frequency of operation can be increased.
The delay
between the two clocks can be increased until the
minimum delay of clock to serial out would potentially
cause a serial bit to be swallowed (Figure 3).
Figure 2. Cascaded 1:8 Converter Architecture
With a minimum delay of 800 ps on this output, the
clock for the lower order E445 cannot be delayed more
than 800 ps relative to the clock of the first E445 with-
out potentially missing a bit of information. Because
the setup time on the serial input pin is negative, coinci-
dent excursions on the data and clock inputs of the E445
will result in correct operation.
Figure 3. Cascade Frequency Limitation
PARALLEL
DATA
PARALLEL
DATA
TO SERIAL
MEDIUM
FROM SERIAL
MEDIUM
SOUT
SOUT*
SINA
SINA*
SINB
SINB*
SERIAL
INPUT
DATA
SIN
SIN*
SOUT
SOUT*
E445a
Q3
Q2 Q1 Q0
Q7 Q6 Q5 Q4
SIN
SIN*
E445b
Q3 Q2 Q1 Q0
Q3
Q2 Q1 Q0
CLOCK
CLOCK*
CLOCK
Tpd CLK
to SOUT
PARALLEL OUTPUT DATA
800 ps
100 ps
1150 ps
CLOCK A
CLOCK B
Tpd CLK
to SOUT
800 ps
1150 ps
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SK100E445PJ | 100E SERIES, 4-BIT RIGHT SERIAL IN PARALLEL OUT SHIFT REGISTER, TRUE OUTPUT, PQCC28 |
| SK10EL11WD | 10EL SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8 |
| SK10EL11WDT | 10EL SERIES, LOW SKEW CLOCK DRIVER, 2 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO8 |
| SK10EL15WD | 10EL SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), PDSO16 |
| SK100EL15WU | 100EL SERIES, LOW SKEW CLOCK DRIVER, 4 TRUE OUTPUT(S), 0 INVERTED OUTPUT(S), UUC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SK10E445PJT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4-Bit Serial/Parallel Converter |
| SK10EL01W | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4-Input OR / NOR |
| SK10EL01WD | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4-Input OR / NOR |
| SK10EL01WDT | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4-Input OR / NOR |
| SK10EL01WU | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:4-Input OR / NOR |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。