This is the output pin for the DDR memory termination voltage and it has a sink/source current capability of ±1.5A. VTT
voltage tracks the voltage at VDDQ pin divided in half. The output is turned OFF when EN pin is “Low” or when either
the VCC UVLO or the thermal shutdown protection function is activated.
Always connect a capacitor to VTT pin for loop gain and phase compensation and for reduction in output voltage
variation in the event of sudden load change. Be careful in choosing the capacitor as insufficient capacitance may
cause oscillation and high ESR (Equivalent Series Resistance) may result in increased output voltage variation during
a sudden change in load. Using a low-ESR ceramic capacitor, however, may reduce the loop gain and phase margin
and may cause oscillation. But this effect can be lessened by connecting a resistor in series with the capacitor. A 220μF
functional polymer capacitor (OS-CON, POS-CAP, NEO-CAP) is recommended, though ambient temperature and
other conditions should also be considered.
EN
A “High” input of 2.0V or higher to EN turns ON the VTT output. A “Low” input of 0.8V or less, on the other hand, turns
VTT to a Hi-Z state. With a “Low” EN input, however, the VREF output remains ON, provided that sufficient VCC and
VDDQ voltages have been established.
7.
Absolute Maximum Ratings
Parameter
Input Voltage
EN Input Voltage
Termination Input Voltage
VDDQ Reference Voltage
Output Current
Power Dissipation1
Power Dissipation2
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Symbol
V
CC
V
EN
V
VTT_IN
V
VDDQ
I
VTT
Pd1
Pd2
Topr
Tstg
Tjmax
Limit
7
(Note 1)
7
(Note 1)
7
(Note 1)
7
(Note 1)
1.5
0.56
(Note 2)
0.69
(Note 3)
-10 to +100
-55 to+150
+150
Unit
V
V
V
V
A
W
W
°C
°C
°C
(Note 1) Should not exceed Pd.
(Note 2) Derate by 4.48mW/°C for Ta over 25°C (With no heat sink).
(Note 3) Derate by 5.52mW/°C for Ta over 25°C (When mounted on a board 70mm x 70mm x 1.6mm Glass-epoxyPCB).
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. In addition, it is impossible to predict all destructive situations such as
short-circuit modes, open circuit modes, etc. Therefore, it is important to consider circuit protection measures, like adding a fuse, in case the IC is operated in a
special mode exceeding the absolute maximum ratings.
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