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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
CA and CS# Setup, Hold, and Derating
For slow slew rates the total setup time could be a negative value (that is, a valid input
signal will not have reached V IH /V IL(AC) at the time of the rising clock transition). A valid
input signal is still required to complete the transition and reach V IH /V IL(AC) .
For slew rates between the values listed in Table 89, the derating values are obtained us-
ing linear interpolation. Slew rate values are not typically subject to production testing.
They are verified by design and characterization.
Table 87: CA and CS# Setup and Hold Base Values (>400 MHz, 1 V/ns Slew Rate)
Data Rate
Parameter
1066
933
800
667
533
466
Reference
t IS
t IH
(base)
(base)
0
90
30
120
70
160
150
240
240
330
300
390
V IH /V IL(AC) = V REF(DC) ±220mV
V IH /V IL(DC) = V REF(DC) ±130mV
Note:
1. AC/DC referenced for 1 V/ns CA and CS# slew rate, and 2 V/ns differential CK / CK# slew
rate.
Table 88: CA and CS# Setup and Hold Base Values (<400 MHz, 1 V/ns Slew Rate)
Data Rate
Parameter
400
333
255
200
Reference
t IS
t IH
(base)
(base)
300
400
440
540
600
700
850
950
V IH /V IL(AC) = V REF(DC) ±300mV
V IH /V IL(DC) = V REF(DC) ±200mV
Note:
1. AC/DC referenced for 1 V/ns CA and CS# slew rate, and 2 V/ns differential CK / CK# slew
rate.
Table 89: Derating Values for AC/DC-Based t IS/ t IH (AC220)
Δ t IS, Δ t IH derating in p s
CK, CK# Differential Slew Rate
4.0 V/ns
3.0 V/ns
2.0 V/ns
1.8 V/ns
1.6 V/ns
1.4 V/ns
1.2 V/ns
1.0 V/ns
Δ t IS
Δ t IH
Δ t IS
Δ t IH
Δ t IS
Δ t IH
Δ t IS
Δ t IH
Δ t IS
Δ t IH
Δ t IS
Δ t IH
Δ t IS
Δ t IH
Δ t IS Δ t IH
CA, CS# slew
2.0
110
65
110
65
110
65
rate V/ns
1.5
74
43
73
43
73
43
89
59
1.0
0
0
0
0
0
0
16
16
32
32
0.9
-3
-5
-3
-5
13
11
29
27
45
43
0.8
-8
-13
8
3
24
19
40
35
56
55
0.7
0.6
2
-6
18
10
10
-3
34
26
26
13
50
42
46
33
66
58
78
65
0.5
0.4
4
-4
20
-7
16
2
36
17
48
34
Note:
1. Shaded cells are not supported.
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
150
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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MT42L256M32D4KP-MS
制造商:Micron Technology Inc 功能描述:256MX32 LPDDR2 PLASTIC IND TEMP GREEN WFBGA 1.2V - Bulk