k4s561632a Samsung Semiconductor, Inc., k4s561632a Datasheet - Page 3

• Manufacturer Part Number: k4s561632a
• Description: 256mbit Sdram 4m X 16bit X 4 Banks Synchronous Dram Lvttl
• Manufacturer: Samsung Semiconductor, Inc.

PIN CONFIGURATION (Top view)
PIN FUNCTION DESCRIPTION
K4S561632A
CLK
CS
CKE
A
BA
RAS
CAS
WE
L(U)DQM
DQ
V
V
N.C/RFU
0
DD
DDQ
~ A
0
0
/V
Pin
~ BA
~
/V
SS
12
15
SSQ
1
System cock
Chip select
Clock enable
Address
Bank select address
Row address strobe
Column address strobe
Write enable
Data input/output mask
Data input/output
Power supply/ground
Data output power/ground
No connection
/reserved for future use
Name
A10/AP
LDQM
V
V
V
V
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
CAS
RAS
BA0
BA1
V
V
V
DDQ
DDQ
SSQ
SSQ
WE
CS
A0
A1
A2
A3
DD
DD
DD
Active on the positive going edge to sample all inputs.
Disables or enables device operation by masking or enabling all inputs except
CLK, CKE and DQM
Masks system clock to freeze operation from the next clock cycle.
CKE should be enabled at least one cycle prior to new command.
Disable input buffers for power down in standby.
Row/column addresses are multiplexed on the same pins.
Row address : RA
Selects bank to be activated during row address latch time.
Selects bank for read/write during column address latch time.
Latches row addresses on the positive going edge of the CLK with RAS low.
Enables row access & precharge.
Latches column addresses on the positive going edge of the CLK with CAS low.
Enables column access.
Enables write operation and row precharge.
Latches data in starting from CAS, WE active.
Makes data output Hi-Z, t
Blocks data input when L(U)DQM active.
Data inputs/outputs are multiplexed on the same pins.
Power and ground for the input buffers and the core logic.
Isolated power supply and ground for the output buffers to provide improved noise
immunity.
This pin is recommended to be left No Connection on the device.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
0
~ RA
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
12
SHZ
V
DQ15
V
DQ14
DQ13
V
DQ12
DQ11
V
DQ10
DQ9
V
DQ8
V
N.C/RFU
UDQM
CLK
CKE
A12
A11
A9
A8
A7
A6
A5
A4
V
, Column address : CA
SS
SSQ
DDQ
SSQ
DDQ
SS
SS
after the clock and masks the output.
Input Function
(0.8 mm Pin pitch)
(400mil x 875mil)
54Pin TSOP (II)
0
~ CA
8
Rev. 0.0 Sep. 1999
CMOS SDRAM