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W9864G6JH
5. PIN DESCRIPTION
PIN NUMBER
PIN NAME
FUNCTION
DESCRIPTION
Multiplexed pins for row and column address.
23 ~ 26, 22,
29 ~35
A0 ? A11
Address
Row address: A0 ? A11. Column address: A0 ? A7.
A10 is sampled during a precharge command to
determine if all banks are to be precharged or bank
selected by BS0, BS1.
20, 21
2, 4, 5, 7, 8, 10,
11, 13, 42, 44,
45, 47, 48, 50,
51, 53
BS0, BS1
DQ0 ? DQ15
Bank Select
Data
Input/ Output
Select bank to activate during row address latch time,
or bank to read/write during address latch time.
Multiplexed pins for data output and input.
Disable or enable the command decoder. When
19
CS
Chip Select
command decoder is disabled, new command is
ignored and previous operation continues.
18
RAS
Row Address
Strobe
Command input. When sampled at the rising edge of
the clock RAS , CAS and WE define the
operation to be executed.
17
CAS
Column
Address Strobe Referred to RAS
16
39, 15
38
WE
UDQM
LDQM
CLK
Write Enable
Input/output
mask
Clock Inputs
Referred to RAS
The output buffer is placed at Hi-Z (with latency of 2)
when DQM is sampled high in read cycle. In write
cycle, sampling DQM high will block the write
operation with zero latency.
System clock used to sample inputs on the rising
edge of clock.
CKE controls the clock activation and deactivation.
37
CKE
Clock Enable
When CKE is low, Power Down mode, Suspend
mode, or Self Refresh mode is entered.
1, 14, 27
28, 41, 54
3, 9, 43, 49
6, 12, 46, 52
V DD
V SS
V DDQ
V SSQ
Power
Ground
Power for I/O
buffer
Ground for I/O
buffer
Power for input buffers and logic circuit inside DRAM.
Ground for input buffers and logic circuit inside
DRAM.
Separated power from V DD , to improve DQ noise
immunity.
Separated ground from V SS , to improve DQ noise
immunity.
36, 40
NC
No Connection No connection.
-5-
Publication Release Date: Jun. 25, 2013
Revision A04
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