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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
Output Driver Impedance
Figure 93: Output Driver
Chip in Drive Mode
Output Driver
V DDQ
To other
circuitry
(RCV, etc.)
I PU
R ONPU
I OUT
DQ
R ONPD
V OUT
I PD
V SSQ
Output Driver Impedance Characteristics with ZQ Calibration
Output driver impedance is defined by the value of the external reference resistor R ZQ .
Typical R ZQ is 240 ohms.
Table 78: Output Driver DC Electrical Characteristics with ZQ Calibration
Notes 1–4 apply to all parameters and conditions
R ONnom
Ω
Ω
Ω
Ω
Ω
Ω
Mismatch between
Resistor
R ON34PD
R ON34PU
R ON40PD
R ON40PU
R ON48PD
R ON48PU
R ON60PD
R ON60PU
R ON80PD
R ON80PU
R ON120PD
R ON120PU
MM PUPD
V OUT
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
0.5 × V DDQ
Min
0.85
0.85
0.85
0.85
0.85
0.85
0.85
0.85
0.85
0.85
0.85
0.85
–15.00
Typ
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
1.00
Max
1.15
1.15
1.15
1.15
1.15
1.15
1.15
1.15
1.15
1.15
1.15
1.15
+15.00
Unit
R ZQ /7
R ZQ /7
R ZQ /6
R ZQ /6
R ZQ /5
R ZQ /5
R ZQ /4
R ZQ /4
R ZQ /3
R ZQ /3
R ZQ /2
R ZQ /2
%
Notes
5
pull-up and pull-down
Notes:
1. Applies across entire operating temperature range after calibration.
2. R ZQ
Ω
3. The tolerance limits are specified after calibration, with fixed voltage and temperature.
For behavior of the tolerance limits if temperature or voltage changes after calibration.
4. Pull-down and pull-up output driver impedances should be calibrated at 0.5 x V DDQ .
5. Measurement definition for mismatch between pull-up and pull-down, MM PUPD :
Measure R ONPU and R ONPD , both at 0.5 × V DDQ :
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
132
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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