Datasheet

DDR3L Alternative 40 Ohm Driver
Table 42: DDR3L 40 Ohm Driver Impedance Characteristics
MR1
[5, 1]
R
ON
Resistor V
OUT
Min Nom Max Units
0, 0 Ω R
ON,40PD
0.2 × V
DDQ
0.6 1.0 1.15 RZQ/6
0.5 × V
DDQ
0.9 1.0 1.15 RZQ/6
0.8 × V
DDQ
0.9 1.0 1.45 RZQ/6
R
ON,40PU
0.2 × V
DDQ
0.9 1.0 1.45 RZQ/6
0.5 × V
DDQ
0.9 1.0 1.15 RZQ/6
0.8 × V
DDQ
0.6 1.0 1.15 RZQ/6
Pull-up/pull-down mismatch (MM
PUPD
)V
IL(AC)
to V
IH(AC)
–10 N/A 10 %
Notes:
1. Tolerance limits assume RZQ of 240Ω ±1% and are applicable after proper ZQ calibra-
tion has been performed at a stable temperature and voltage (V
DDQ
= V
DD
; V
SSQ
= V
SS
).
Refer to DDR3L 40 Ohm Output Driver Sensitivity (page 60) if either the temperature
or the voltage changes after calibration.
2. Measurement definition for mismatch between pull-up and pull-down (MM
PUPD
). Meas-
ure both R
ON(PU)
and R
ON(PD)
at 0.5 × V
DDQ
:
MM
PUPD
= × 100
R
ON(PU)
- R
ON(PD)
R
ON,nom
3. For IT and AT (1Gb only) devices, the minimum values are derated by 6% when the de-
vice operates between –40°C and 0°C (T
C
).
A larger maximum limit will result in slightly lower minimum currents.
DDR3L 40 Ohm Output Driver Sensitivity
If either the temperature or the voltage changes after I/O calibration, then the tolerance
limits listed in Table 42 can be expected to widen according to Table 43 and Table 44
(page 61).
Table 43: DDR3L 40 Ohm Output Driver Sensitivity Definition
Symbol Min Max Unit
R
ON(PD)
@ 0.2 × V
DDQ
0.6 - dR
ON
dTL × |ΔT| - dR
ON
dVL × |ΔV| 1.1 + dR
ON
dTL × |ΔT| + dR
ON
dVL × |ΔV| RZQ/6
R
ON(PD)
@ 0.5 × V
DDQ
0.9 - dR
ON
dTM × |ΔT| - dR
ON
dVM × |ΔV| 1.1 + dR
ON
dTM × |ΔT| + dR
ON
dVM × |ΔV| RZQ/6
R
ON(PD)
@ 0.8 × V
DDQ
0.9 - dR
ON
dTH × |ΔT| - dR
ON
dVH × |ΔV| 1.4 + dR
ON
dTH × |ΔT| + dR
ON
dVH × |ΔV| RZQ/6
R
ON(PU)
@ 0.2 × V
DDQ
0.9 - dR
ON
dTL × |ΔT| - dR
ON
dVL × |ΔV| 1.4 + dR
ON
dTL × |ΔT| + dR
ON
dVL × |ΔV| RZQ/6
R
ON(PU)
@ 0.5 × V
DDQ
0.9 - dR
ON
dTM × |ΔT| - dR
ON
dVM × |ΔV| 1.1 + dR
ON
dTM × |ΔT| + dR
ON
dVM × |ΔV| RZQ/6
R
ON(PU)
@ 0.8 × V
DDQ
0.6 - dR
ON
dTH × |ΔT| - dR
ON
dVH × |ΔV| 1.1 + dR
ON
dTH × |ΔT| + dR
ON
dVH × |ΔV| RZQ/6
Note:
1. ΔT = T - T
(@CALIBRATION)
ΔV = V
DDQ
- V
DDQ(@CALIBRATION)
; and V
DD
= V
DDQ
.
8Gb: x4, x8, x16 DDR3L SDRAM
Output Driver Impedance
60
Rev 2.0 June 2016
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