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EM47DM0888SBA Schematic ( PDF Datasheet ) - Eorex

Teilenummer EM47DM0888SBA
Beschreibung 1Gb Double DATA RATE 3 SDRAM
Hersteller Eorex
Logo Eorex Logo 




Gesamt 30 Seiten
EM47DM0888SBA Datasheet, Funktion
Revision History
Revision 0.1 (May. 2011)
-First release.
EM47DM0888SBA
May. 2011
1/39
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EM47DM0888SBA Datasheet, Funktion
EM47DM0888SBA
Pin Description (Continued)
C3,D3
B7,A7
F3, G3, H3
DQS, DQS
TDQS,
TDQS
RAS ,
CAS , WE
(Data Strobe)
Output with read data, input with write data. Edge-aligned with read data,
centered in write data. The data strobe DQS is paired with differential
signal /DQS to provide differential pair signaling to the system during
reads and writes. DDR3 SDRAM supports differential data strobe only
and does not support single-ended.
(Termination Data Strobe)
When enabled via Mode Register A11=1 in MR1, DRAM will enable the
same termination resistance function on TDQS/TDQS that is applied to
DQS/DQS. When disabled via mode register A11=0 in MR1, DM/TDQS
will provide the data mask function and TDQS is not used.
(Command Inputs)
RAS , CAS and WE (along with CS ) define the command being
entered.
B7
B3,C7,C2,C8,E3,
E8,D2,E7
A2,A9,D7,G2,G8,K
1,K9,M1,M9/A1,A8,
B1,D8,F2,F8,J1,J9,
L1,L9,N1,N9
B9,C1,E2,E9
/B2,B8,C9,D1,D9
H8
DM
DQ0~7
VDD/VSS
VDDQ
/VSSQ
ZQ
(Input Data Mask)
DM is an input mask signal for write data. Input data is masked when
DM is sampled HIGH coincident with that input data during a write
access. DM is sampled on both edges of DQS.
(Data Input/Output)
Data inputs and outputs are on the same pin.
(Power Supply/Ground)
VDD and VSS are power supply for internal circuits.
(DQ Power Supply/DQ Ground)
VDDQ and VSSQ are power supply for the output buffers.
(ZQ Calibration)
Reference pin for ZQ calibration
(Active Low Asynchronous Reset)
N2
E1
J8
A3,F1,H1,F9,
H9,J7,N7
RESET
VREFDQ
VREFCA
NC
Reset is active when RESET is LOW, and inactive when RESET is
HIGH. RESET must be HIGH during normal operation. RESET is a
CMOS rail to rail signal with DC high and low at 80% and 20% of VDD,
i.e. 1.20V for DC high and 0.30V for DC low.
(Reference Voltage)
Reference voltage for DQ
(Reference Voltage)
Reference voltage for CA
(No Connection)
No internal electrical connection is present.
Note: Input pins only BA0-BA2, A0-A13, RAS , CAS , WE , CS , CKE, ODT and RESET do not supply
termination.
May. 2011
6/39
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6 Page









EM47DM0888SBA pdf, datenblatt
EM47DM0888SBA
AC and DC Output Measurement Levels
Symbol Parameter
Specification Units Note
VOH(DC)
VOM(DC)
VOL(DC)
VOH(AC)
VOL(AC)
VOHdiff(DC)
VOLdiff(DC)
DC output high measurement level (for IV curve linearity)
DC output middle measurement level (for IV curve linearity)
DC output low measurement level (for IV curve linearity)
AC output high measurement level (for output slew rate)
AC output low measurement level (for output slew rate)
AC differential output high measurement level (for output
slew rate)
AC differential output low measurement level (for output
slew rate)
0.8*VDDQ
0.5*VDDQ
0.2*VDDQ
VTT+0.1*VDDQ
VTT-0.1*VDDQ
0.2*VDDQ
-0.2*VDDQ
V
V
V
V
V
V
V
1
1
2
2
Notes1. The swing of ±0.1 × VDDQ is based on approximately 50% of the static single-ended output high or
low swing with a driver impedance of 34and an effective test load of 25to VTT = VDDQ/2 at each of the
differential outputs.
Notes2. The swing of ±0.2 × VDDQ is based on approximately 50% of the static single-ended output high or
low swing with a driver impedance of 34and an effective test load of 25to VTT = VDDQ/2 at each of the
differential outputs.
DQS Output Crossing Voltage - VOX (DDR3-1600 or Higher Speed Bin)
Symbol
Parameters
DQS, /DQS differential slew rate
5V/ns 6V/ns 7V/ns 8V/ns 9V/ns
Deviation of DQS,
VOX (AC) max. /DQS output
+100 +120 +140 +160 +180
cross point
VOX (AC) min.
voltage from
0.5*VDDQ
-100 -120 -140 -160 -180
10V/ns
+200
-200
11V/ns
+200
-200
12V/ns
+200
-200
Unit
mV
mV
DQS Output Crossing Voltage - VOX (DDR3-1333 or Lower Speed Bin)
Symbol
Parameters
DQS, /DQS differential slew rate
5V/ns 6V/ns 7V/ns 8V/ns 9V/ns
Deviation of DQS,
VOX (AC) max. /DQS output
+125 +150 +175 +200 +225
cross point
VOX (AC) min.
voltage from
0.5*VDDQ
-125 -150 -175 -200 -225
10V/ns
+225
-225
11V/ns
+225
-225
12V/ns
+225
-225
Unit
mV
mV
Notes1. Measured using an effective test load of 25Ω to 0.5* VDDQ at each of the differential outputs.
Notes2. For a differential slew rate in between the listed values, the VOX value may be obtained by linear
interpolation.
Notes3. The DQS, /DQS pins under test are not required to be able to drive each of the slew rates listed in the
table; the pins under test will provide one VOX value when tested with specified test condition. The DQS and
/DQS differential slew rate when measuring VOX determines which VOX limits to use.
May. 2011
12/39
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