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IC822 M12L1616A-7T(SDRAM)
IC BLOCK DIAGRAM & DESCRIPTION
Bank select
LRAS
LWCBR
LCKE
LCBR
LRAS
LCBR
LWE LDQM
Address registor
35CLK
LWE
14 LDQM
DQi
35 34 18 17 16
CLK CKE
15
WE
14,36
L(U)DQM
20~24
27~32
ADD
Data input register
512K X 16
512K X 16
Column decoder
Latency & burst length
Progremming register
Column address
buffer
Row buffer
refresh counter
LCAS
Timing register
Row decoder
I/O controlOutput buffer
OSense
AMP
CASRASCS
No.
35
18
34
20,21~24
27~32
19
17
16
15
14,36
2,3,5,6,8,9,11,
12,39,40,42,43,
45,46,48,49
1,50
7,41
37
2,3,
5,6,
8,9,
11,12,
39,40,
42,43,
45,46,
48,49
Name
System clock
Chip select
Clock enable
Address
Bank select address
Row address strobe
Column address strobe
Write enable
Data mask ensble
Data input/output
Power supply/ground
Output buffer power/ground
No connection
Input Function
Active on the positive going edge to sample all inputs.
Disables or enable device operation by masking or enablin
all inputs except CLK, CKE and L(U)DQM.
Masks system clock to freeze operation from the next clock
cycle. CKE should be enable at least one cycle prior to no
command. Disable input buffers for power down in standby.
Row/column addresses are multiplexed on the same pin.
Row address : RA0 to RA10, column address : CA0 to CA7
Select bank to be activated during row address latchtime.
Select bank for read/write during column address latch time.
Latches row address on the positive going edge of the CLK
with RAS low. Enable row access & precharge.
Latches column address on the positive going edge of the
CLK with CAS low. Enable column access.
Enable write operation and row precharge.
Latches data in strting from CAS, WE active.
Makes data output Hi-Z, t SHZ after the clock and masks
the output. Blocks data input when L(U)DQM active.
Data inputs/outputs are multiplexed on the same pins.
Power and ground for theinput buffer and the core logic.
Isolated power supply and ground for the output buffers
to proxide improved noise immunity.
This pin is recommended to be left no connection on the
device.
Pin
CLK
CS
CKE
A0 to A10/AP
BA
RAS
CAS
WE
L(U)DQM
DQ0 to 15
VDD/VSS
VDDQ/VSSQ
N.C/RFU
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