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μ PD44647094A-A, 44647184A-A, 44647364A-A, 44647096A-A, 44647186A-A, 44647366A-A
On-Die Termination (ODT)
On-Die Termination (ODT) is enabled by setting ODT control pin to HIGH at power-on sequence. The ODT resistors
(R TT ) are set to 0.6 x RQ, where RQ is a resistor from ZQ pin bump to ground. With ODT on, all the Ds and BW#s are
terminated to V DD Q and V SS with a resistance R TT x 2. The command, address, and clock signals are not terminated.
Figure below shows the equivalent circuit of a Dxx and BWx# receiver with ODT. ODT at the Ds and BW#s are always
on.
When the ODT control pin is LOW or No Connect at power-on sequence, the ODT function is always off.
When the ODT be changed the state after power-on, the AC/DC characteristics cannot be guaranteed.
On-Die Termination DC Parameters
Description
On-Die termination
External matching resistor
Symbol
R TT
RQ
MIN.
105
175
TYP.
150
250
MAX.
210
350
Units
Ω
Ω
Remark
The allowable range of RQ to guarantee impedance matching a tolerance of ± 20 % is between 175 Ω
and 350 Ω .
On- Die Termination-Equivalent Circuit
V DD Q
SW
R TT x 2
Dxx, BWx#
Receiver
R TT x 2
SW
V SS
QDR Consortium specification for ODT is defined when 6R is HIGH and vendor specification when 6R is LOW or
Floating. NEC specification is "Disabled" with 6R LOW or Floating as follows.
ODT-option clarification
6R input
ODT function
Termination value
Consortium specification
NEC specification
Consortium specification
NEC specification
HIGH
LOW
Floating
Active
Vendor specification
Vendor specification
Active
Disabled
Disabled
R TT = 0.6 x RQ
Vendor specification
Vendor specification
R TT = 0.6 x RQ
–
–
10
Note
In case of nominal value (RQ = 250 Ω ), R TT = 150 Ω .
Data Sheet M19962EJ2V0DS
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