UPD44646183AF5-E25-FQ1 Renesas Electronics America, UPD44646183AF5-E25-FQ1 Datasheet - Page 10

• Manufacturer Part Number: UPD44646183AF5-E25-FQ1
• Description: SRAM DDRII 72MBIT 165-PBGA
• Manufacturer: Renesas Electronics America

Specifications of UPD44646183AF5-E25-FQ1

• Format - Memory: RAM
• Memory Type: SRAM - Synchronous, DDR II+
• Memory Size: 72M (4M x 18)
• Speed: 400MHz
• Interface: Parallel
• Voltage - Supply: 1.7 V ~ 1.9 V
• Operating Temperature: 0°C ~ 70°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

On-Die Termination (ODT)
(R
terminated to V
Figure below shows the equivalent circuit of a DQxx and BWx# receiver with ODT. ODT of DQs are dynamically
switched off before a half cycle when READ commands starts and are designed to be off prior to the product driving the
bus. ODT of BW#s are always on. Similarly, ODTs are designed to switch on after a half cycle when the product has
issued the last piece of data.
QDR
Floating. NEC specification is "Disabled" with 6R LOW or Floating as follows.
10
On-Die termination
External matching resistor
On-Die Termination (ODT) is enabled by setting ODT control pin to HIGH at power-on sequence. The ODT resistors
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.
TT
Remark
) are set to 0.6 x RQ, where RQ is a resistor from ZQ pin bump to ground. With ODT on, all the DQs and BW#s are
Note
TM
HIGH
LOW
Floating
Consortium specification for ODT is defined when 6R is HIGH and vendor specification when 6R is LOW or
6R input
Description
In case of nominal value (RQ = 250
The allowable range of RQ to guarantee impedance matching a tolerance of ± 20 % is between 175 Ω
and 350 Ω.
DD
Q and V
μ
PD44646092A-A, 44646182A-A, 44646362A-A, 44646093A-A, 44646183A-A, 44646363A-A
Vendor specification
Active
Vendor specification
Consortium specification
SS
with a resistance R
ODT function
Symbol
DQxx, BWx#
On- Die Termination-Equivalent Circuit
RQ
Preliminary Data Sheet M19960EJ1V0DS
R
On-Die Termination DC Parameters
TT
ODT-option clarification
Active
Disabled
Disabled
TT
NEC specification
x 2. The command, address, and clock signals are not terminated.
Ω
), R
TT
MIN.
105
175
V
V
= 150
DD
SS
Q
R
R
SW
SW
TT
TT
Ω
x 2
x 2
.
R
Vendor specification
Vendor specification
Consortium specification
TT
= 0.6 x RQ
Receiver
TYP.
150
250
Termination value
MAX.
210
350
R
NEC specification
TT
= 0.6 x RQ
–
–
Units
Ω
Ω