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PTHXX060

(Top View)

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PTH03060Y

PTH05060Y, PTH12060Y

SLTS222A–MARCH 2004–REVISED OCTOBER 2005

Terminal Functions

TERMINAL

DESCRIPTION

NAME

NO.

VIN

2

The positive input voltage power node to the module, which is referenced to common GND.

This is the common ground connection for the VIN and VTT power connections. It is also the 0-VDC reference

GND

1, 7

for the control inputs.

The module senses the voltage at this input to regulate the output voltage, VTT. The voltage at VREF is also

the reference voltage for the system bus receiver comparators. It is normally set to precisely half the bus

VREF

8

driver supply voltage (VDDQ÷ 2), using a resistor divider. The Thevenin impedance of the network driving the

VREF pin should not exceed 500 Ω. See the Typical DDR Application Diagram in the Application Information

section for reference.

This is the regulated power output from the module with respect to the GND node, and the tracking

termination supply for the application data and address buses. It is precisely regulated to the voltage applied

VTT

6

to the module's VREF input, and is active active about 20 ms after a valid input source is applied to the

module. Once active it will track the voltage applied at VREF.

The sense input allows the regulation circuit to compensate for voltage drop between the module and the

Vo Sense

5

load. For optimal voltage accuracy Vo Sense should be connected to VTT.

The Inhibit pin is an open-collector/drain negative logic input that is referenced to GND. Applying a low-level

ground signal to this input turns off the output voltage, VTT. Although the module is inhibited, a voltage, VDDQ

will be present at the output terminals, fed through the DDR memory. When the Inhibit is active, the input

Inhibit

3

current drawn by the regulator is significantly reduced. If the Inhibit pin is left open circuit, the module will

produce an output whenever a valid input source is applied. See the Typical DDR Application Diagram in the

Application Information section for reference.

N/C

4, 9, 10

No connect

4