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PTH12010Y Datasheet(PDF) 7 Page - Texas Instruments

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Part # PTH12010Y
Description  15-A NON-ISOLATED DDR/QDR MEMORY BUS TERMINATION MODULES
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PTH12010Y Datasheet(HTML) 7 Page - Texas Instruments

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APPLICATION INFORMATION
Typical DDR Application Diagram
Inhibit
+
+
DDRII/
QDRII
PTH05010W
VDDQ I/O Memory
Inhibit
+
PTH05050Y
DDR Termination
+
2 ×
330 µF
2 ×
22 µF
2 ×
330 µF
2 ×
22 µF
+Sense
Margin ±
Auto-Track
VI
+VADJ
1 kΩ
1 kΩ
VI= 5V
220 µF
47 µF
470 µF
47 µF
5.51 kΩ
VO
+VREF
VI
UDG−05096
VTT
VTT = 0.9 V
VDDQ = 1.8 V
CAPACITOR RECOMMENDATIONS FOR THE PTH03010Y AND PTH05010Y DDR POWER
Input Capacitor
Output Capacitors
PTH03010Y
PTH05010Y
PTH12010Y
SLTS223A–MARCH 2004–REVISED OCTOBER 2005
MODULES
(3.3-V/5-V OPTION)
The recommended input capacitor(s) is determined by the 470 µF minimum capacitance and 500 mArms
minimum ripple current rating.
Ripple current, less than 160 mΩ equivalent series resistance (ESR), and temperature are the major
considerations when selecting input capacitors. Unlike polymer tantalum, regular tantalum capacitors have a
recommended minimum voltage rating of 2 × (maximum dc voltage + ac ripple). This is standard practice to
ensure reliability.
For improved ripple reduction on the input bus, ceramic capacitors may used to complement electrolytic types to
achieve the minimum required capacitance.
For applications with load transients (sudden changes in load current), regulator response benefits from external
output capacitance. The recommended output capacitance of 470 µF will allow the modue to meet its transieint
response specification. (See Electrical Specifications table). For most applications, a high quality computer-grade
aluminum electrolytic capacitor is adequate. These capacitors provide decoupling over the frequency range,
2 kHz to 150 kHz, and are suitable for ambient temperatures above 0°C. Below 0°C, tantalum, ceramic or
Os-Con type capacitors are recommended. When using one or more nonceramic capacitors, the calculated
equivalent ESR should be no lower than 4 mΩ (7 mΩ using the manufacturer’s maximum ESR for a single
capacitor).
A list of preferred low-ESR type capacitors are identified in Table 1. In addition to electrolytic capacitance, adding
a 10-µF to 22-µF X5R/X7R ceramic capacitor to the output reduces the output ripple voltage and improve the
regulator’s transient response. The measurement of both the output ripple and transient response is also best
achieved across a 10-µF ceramic capacitor.
7


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