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MT46H16M32LF

Mobile Low-Power DDR SDRAM

Micron Technology 

512Mb: x16, x32 Mobile LPDDR SDRAM

Power-Down

Figure 49: Self Refresh Mode

CK#

CK1

CKE1,2

Command

Address

DQS

DQ

DM

T0

T1

tCH

tIS tIH

tCL

tIS

((

))

((

))

tCKE

tIS tIH

NOP

tRP4

((

))

((

AR3

))

((

))

((

))

((

))

((

))

((

))

((

))

((

))

((

))

((

))

Enter self refresh mode

Ta01

tCK

Ta1

tIS

NOP

((

Tb0

))

((

))

((

))

((

))

((

))

((

Valid

))

tIS tIH

((

))

((

Valid

))

((

))

((

))

((

))

((

))

((

))

((

))

tXSR5

Exit self refresh mode

Don’t Care

Notes:

1. Clock must be stable, cycling within specifications by Ta0, before exiting self refresh

mode.

2. CKE must remain LOW to remain in self refresh.

3. AR = AUTO REFRESH.

4. Device must be in the all banks idle state prior to entering self refresh mode.

5. Either a NOP or DESELECT command is required for tXSR time with at least two clock

pulses.

Power-Down

Power-down is entered when CKE is registered LOW. If power-down occurs when all

banks are idle, this mode is referred to as precharge power-down; if power-down occurs

when there is a row active in any bank, this mode is referred to as active power-down.

Entering power-down deactivates all input and output buffers, including CK and CK#

and excluding CKE. Exiting power-down requires the device to be at the same voltage as

when it entered power-down and received a stable clock. Note that the power-down du-

ration is limited by the refresh requirements of the device.

When in power-down, CKE LOW must be maintained at the inputs of the device, while

all other input signals are “Don’t Care.” The power-down state is synchronously exited

when CKE is registered HIGH (in conjunction with a NOP or DESELECT command).

NOP or DESELECT commands must be maintained on the command bus until tXP is

satisfied. See Figure 51 (page 93) for a detailed illustration of power-down mode.

PDF: 09005aef83dd2b3e

t67m_512mb_mobile_lpddr.pdf - Rev. H 06/13 EN

91

Micron Technology, Inc. reserves the right to change products or specifications without notice.

© 2009 Micron Technology, Inc. All rights reserved.

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