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IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS -74
U8067: LP2996MX (DDR-SDRAM Termination Regulator)
BLOCK DIAGRAM
PIN CONFIGURATION
TERMINAL DESCRIPTION
AVIN AND PVIN
VDDQ
V
SENSE
SHUTDOWN
V
REF
V
TT
PIN
AVIN and PVIN are the input supply pins for the LP2996.
AVIN is used to supply all the internal control circuitry.
VDDQ is the input used to create the internal reference
voltage for regulating V
from a resistor divider of two internal 50 kohm resistor.
The purpose of the sense pin is to provide improved remote
load regulation.
The LP2996 contains an active low shutdown pin that can be
used to tri-state V
V
provides the buffered output of the internal reference
REF
voltage VDDQ / 2.
V
is the regulated output that is used to terminate the bus
TT
resistors. It is capable of sinking and sourcing current while
regulating the output precisely to VDDQ / 2.
DESCRIPTION
. The reference voltage is generated
TT
.
TT
TX-SR875
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