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IC BLOCK DIAGRAM & DESCRIPTION
IC131 M11L416256SA-35T(256k x 16 DRAM)
PIN DESCRIPTIONS
PIN NO.
PIN NAME
TYPE
DESCRIPTION
16~19,22~26
A0~A8
Input
Address Input
Row Address : A0~A8
Column Address : A0~A8
14
RAS
Input
Row Address Strobe
28
CASH
Input
Column Address Strobe / Upper Byte Control
29
CASL
Input
Column Address Strobe / Lower Byte Control
13
WE
Input
Write Enable
27
OE
Input
Output Enable
2~5,7~10,31~34,36~39
I/O0 ~ I/O15
Input / Output Data Input / Output
1,6,20
V
CC
Supply
Power, 3.3V
21,35,40
V
SS
Ground
Ground
11,12,15,30
NC
-
No Connect
CONTROL
LOGIC
DATA-IN BUFFER
CLOCK
GENERATOR
DATA-OUT
BUFFER
COLUMN
ADDRESS
BUFFER
REFRESH
CONTROLER
REFRESH
COUNTER
ROW.
ADDRESS
BUFFERS(9)
9
A0
A1
A2
A3
A4
A5
A6
A7
COLUMN
DECODER
OE
16
RO
W
DE
CO
DE
R
512 x 512 x 16
MEMORY
ARRAY
16
SENSE AMPLIFIERS
I/O GATING
8
512 x 16
V
CC
V
SS
IO0
:
IO15
RAS
CASH
512
512
9
9
9
9
9
CASL
V
BB
GENERATOR
WE
16
A8
IC402 KA78R12STU(Regulator)
OVERVOLTAGE
PROTECTION
SOA PROTECTION
THERMAL SHUTDOWN
BANDGAP REFERENCE
1
Vin
4
Vdis
2
V
O
3
GND
OUTPUT
ON/OFF
SHORT-CIRCUIT
PROTECTION
HIGH/LOW
1.4V
R1
R2
Q1
IC410,411 PQ1CG21H2RZ(Regulator)
+
-
+
-
1
2
5
4
3
Overcurrent
detection
circuit
Overheat
detection
circuit
COM
V
IN
V
OUT
ON/OFF
Oadj
OSC
ON/OFF
Circuit
Soft start
Constant-
voltage
circuit
Q
R
S
