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參數(shù)資料
| 型號： | UR5595-SH2-T |
| 廠商： | 友順科技股份有限公司 |
| 英文描述： | DDR TERMINATION REGULATOR |
| 中文描述： | DDR終端穩(wěn)壓器 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 321K |
| 代理商： | UR5595-SH2-T |
UR5595
MOS IC
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 12
QW-R502-062,A
PIN DESCRIPT IONS
AV
IN
, PV
IN
Input supply pins
. AV
IN
and PV
IN
are two independent input supply pins for UR5595. AV
IN
is used to supply all the
internal analog circuits and PV
IN
is only used to supply the output stage to create the regulated V
TT
. Using a higher
PV
IN
voltages will increase the driving capability of V
TT
, but the internal power loss will also increase. If the junction
temperature exceeds the thermal shutdown than the UR5595 will enter a shutdown state, where V
TT
is tri-stated and
V
REF
remains active.
For SSTL-2 applications, the AV
IN
and PV
IN
can be short together at 2.5V to eliminate the need for bypassing
capacitors for the two supply pins separately.
V
DDQ
The input pin used to create the internal reference voltage from a resistor divider of two internal 50k
resistors for
regulating V
TT
and to guarantee V
TT
will track V
DDQ
/2 precisely. As a remote sense by connecting V
DDQ
directly to the
2.5V rail for SSTL-2 applications is an optimal implementation of V
DDQ
at the DIMM. This ensures that the reference
voltage tracks the DDR memory rails precisely without a large voltage drop from the power lines.
V
SENSE
The sense pin supply improved remote load regulation; if remote load regulation is not used then the V
SENSE
pin
must still be connected to V
TT
. A long trace will cause a significant IR drop resulting in a termination voltage lower at
one end of the bus than the other. Connect V
SENSE
pin to the middle of the bus to provide a better distribution across
the entire termination bus can reduce the IR drop.
V
REF
V
REF
supply the buffered output of the internal reference voltage (V
DDQ
/2). It can provide the reference voltage of
the Northbridge chipset and memory. For better performance, a bypass ceramic capacitor of 0.1
μ
F~0.01
μ
F, located
close to the pin, can be used to to help with noise.
V
TT
V
TT
is a regulated output that is used to terminate the bus resistors of DDR-SDRAM. It can precisely track the
V
DDQ
/2 voltage with the sinking and sourcing current capability. The UTC
UR5595
is designed to handle peak
transient currents of up to ± 3A with a fast transient response. If a transient is expected to remain above the
maximum continuous current rating for a significant amount of time then the output capacitor size should be large
enough to prevent an excessive voltage drop.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UR5596_07 | DDR TERMINATION REGULATOR |
| UR5596 | MOS IC |
| UR5596L-S08-R | MOS IC |
| UR5596L-S08-T | MOS IC |
| UR5596-S08-R | MOS IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UR5596 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:DDR TERMINATION REGULATOR |
| UR5596_07 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:DDR TERMINATION REGULATOR |
| UR5596_10 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:DDR TERMINATION REGULATOR |
| UR5596L-S08-R | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:DDR TERMINATION REGULATOR |
| UR5596L-S08-T | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:DDR TERMINATION REGULATOR |
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