IS42S16400J-7TLI Datasheet, PDF (34/60 Pages) List of Unclassifed Manufacturers – 1 Meg Bits x 16 Bits x 4 Banks (64-MBIT) SYNCHRONOUS DYNAMIC RAM

IS42S16400J
IS45S16400J
PRECHARGE
The PRECHARGE command (see figure) is used to deac-
tivate the open row in a particular bank or the open row in
all banks.The bank(s) will be available for a subsequent row
access some specified time (trp) after the PRECHARGE
command is issued. Input A10 determines whether one or
all banks are to be precharged, and in the case where only
one bank is to be precharged, inputs BA0, BA1 select the
bank. When all banks are to be precharged, inputs BA0,
BA1 are treated as “Don’t Care.” Once a bank has been
precharged, it is in the idle state and must be activated
prior to any READ or WRITE commands being issued to
that bank.
POWER-DOWN
Power-down occurs if CKE is registered LOW coincident
with a NOP or COMMAND INHIBIT when no accesses
are in progress. 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 either
bank, this mode is referred to as active power-down.
Entering power-down deactivates the input and output
buffers, excluding CKE, for maximum power savings while
in standby. The device may not remain in the power-down
state longer than the refresh period (64ms) since no refresh
operations are performed in this mode.
The power-down state is exited by registering a NOP or
COMMAND INHIBIT and CKE HIGH at the desired clock
edge (meeting tcks). See figure below.
PRECHARGE Command
CLK
HIGH - Z
CKE
CS
RAS
CAS
WE
A0-A9, A11
A10
BA0, BA1
ALL BANKS
BANK SELECT
BANK ADDRESS
POWER-DOWN
CLK
tCKS
CKE
≥ tCKS
COMMAND
NOP
All banks idle
Input buffers gated off
NOP
Enter power-down mode
Exit power-down mode
ACTIVE
tRCD
tRAS
tRC
DON'T CARE
34
Integrated Silicon Solution, Inc. — www.issi.com
Rev. F
12/17/2013