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Revision History
Revision 0.1 (Apr. 2008)
- First release.
EM48AM1684VTE
Revision 0.2 (Apr. 2009)..
- modify improved ICCs
Apr. 2009
1/19
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Features
• Fully Synchronous to Positive Clock Edge
• Single 3.3V
±0.3V
Power Supply
• LVTTL Compatible with Multiplexed Address
• Programmable Burst Length (B/L) - 1, 2, 4, 8
or Full Page
• Programmable CAS Latency (C/L) - 2 or 3
• Data Mask (DQM) for Read / Write Masking
• Programmable Wrap Sequence
– Sequential (B/L = 1/2/4/8/full Page)
– Interleave (B/L = 1/2/4/8)
• Burst Read with Single-bit Write Operation
• All Inputs are Sampled at the Rising Edge of
the System Clock
• Auto Refresh and Self Refresh
• 8,192 Refresh Cycles / 64ms (7.8us)
EM48AM1684VTE
256Mb (4M
×
4Bank
×
16) Synchronous DRAM
Description
The EM48AM1684VTE is Synchronous Dynamic
Random Access Memory (SDRAM) organized as
4Meg words x 4 banks by 16 bits. All inputs and
outputs are synchronized with the positive edge of
the clock.
The 256Mb SDRAM uses synchronized pipelined
architecture to achieve high speed data transfer
rates and is designed to operate at 3.3V low power
memory system. It also provides auto refresh with
power saving / down mode. All inputs and outputs
voltage levels are compatible with LVTTL.
Available packages: TSOPII 54P 400mil.
Ordering Information
Part No
EM48AM1684VTE-75F
EM48AM1684VTE-7F
EM48AM1684VTE-6F
EM48AM1684VTE-75FE
EM48AM1684VTE-7FE
EM48AM1684VTE-6FE
Organization
16M X 16
16M X 16
16M X 16
16M X 16
16M X 16
16M X 16
Max. Freq
133MHz @CL3
143MHz @CL3
166MHz @CL3
133MHz @CL3
143MHz @CL3
166MHz @CL3
Package
54pin TSOP(ll)
54pin TSOP(ll)
54pin TSOP(ll)
54pin TSOP(ll)
54pin TSOP(ll)
54pin TSOP(ll)
Grade
Commercial
Commercial
Commercial
Extended
Extended
Extended
Pb
Free
Free
Free
Free
Free
Free
Apr. 2009
2/19
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EM48AM1684VTE
* EOREX reserves the right to change products or specification without notice.
Apr. 2009
3/19
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Pin Assignment
EM48AM1684VTE
54pin TSOP-II / (400mil
×
875mil) / (0.8mm Pin pitch)
Apr. 2009
4/19
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Pin Description (Simplified)
Pin
38
19
Name
CLK
/CS
EM48AM1684VTE
Function
(System Clock)
Master clock input (Active on the positive rising edge)
(Chip Select)
Selects chip when active
(Clock Enable)
Activates the CLK when “H” and deactivates when “L”.
CKE should be enabled at least one cycle prior to new
command. Disable input buffers for power down in standby.
(Address)
Row address (A0 to A12) is determined by A0 to A12 level at
the bank active command cycle CLK rising edge.
CA (CA0 to CA8) is determined by A0 to A8 level at the read or
write command cycle CLK rising edge.
And this column address becomes burst access start address.
A10 defines the pre-charge mode. When A10= High at the
pre-charge command cycle, all banks are pre-charged.
But when A10= Low at the pre-charge command cycle, only the
bank that is selected by BA0/BA1 is pre-charged.
(Bank Address)
Selects which bank is to be active.
(Row Address Strobe)
Latches Row Addresses on the positive rising edge of the CLK
with /RAS “L”. Enables row access & pre-charge.
(Column Address Strobe)
Latches Column Addresses on the positive rising edge of the
CLK with /CAS low. Enables column access.
(Write Enable)
Latches Column Addresses on the positive rising edge of the
CLK with /CAS low. Enables column access.
(Data Input/Output Mask)
DQM controls I/O buffers.
(Data Input/Output)
DQ pins have the same function as I/O pins on a conventional
DRAM.
(Power Supply/Ground)
V
DD
and V
SS
are power supply pins for internal circuits.
(Power Supply/Ground)
V
DDQ
and V
SSQ
are power supply pins for the output buffers.
(No Connection)
This pin is recommended to be left No Connection on the
device.
37
CKE
23~26, 22, 29~36
A0~A12
20, 21
18
BA0, BA1
/RAS
17
/CAS
16
39/15
2, 4, 5, 7, 8, 10,
11, 13, 42, 44, 45,
47, 48, 50, 51, 53
1,14,27/
28,41,54
3, 9, 43, 49/
6, 12, 46, 52
40
/WE
UDQM/LDQM
DQ0~DQ15
V
DD
/V
SS
V
DDQ
/V
SSQ
NC
Apr. 2009
5/19
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