HY5DV281622DT
DESCRIPTION
The Hynix HY5DV281622 is a 134,217,728-bit CMOS Double Data Rate(DDR) Synchronous DRAM, ideally suited for the
point-to-point applications which requires high bandwidth.
The Hynix 8Mx16 DDR SDRAMs offer fully synchronous operations referenced to both rising and falling edges of the
clock. While all addresses and control inputs are latched on the rising edges of the CK (falling edges of the /CK), Data,
Data strobes and Write data masks inputs are sampled on both rising and falling edges of it. The data paths are inter-
nally pipelined and 2-bit prefetched to achieve very high bandwidth. All input and output voltage levels are compatible
with SSTL_2.
FEATURES
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3.3V for V
DD
and 2.5V for V
DDQ
power supply
All inputs and outputs are compatible with SSTL_2
interface
JEDEC standard 400mil 66pin TSOP-II with 0.65mm
pin pitch
Fully differential clock inputs (CK, /CK) operation
Double data rate interface
Source synchronous - data transaction aligned to
bidirectional data strobe (DQS)
x16 device has 2 bytewide data strobes (LDQS,
UDQS) per each x8 I/O
Data outputs on DQS edges when read (edged DQ)
Data inputs on DQS centers when write (centered
DQ)
Data(DQ) and Write masks(DM) latched on the both
rising and falling edges of the data strobe
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All addresses and control inputs except Data, Data
strobes and Data masks latched on the rising edges
of the clock
Write mask byte controls by LDM and UDM
Programmable /CAS latency 3 / 4 supported
Programmable Burst Length 2 / 4 / 8 with both
sequential and interleave mode
Internal 4 bank operations with single pulsed /RAS
tRAS Lock-Out function supported
Auto refresh and self refresh supported
4096 refresh cycles / 32ms
Full, Half and Matched Impedance(Weak) strength
driver option controlled by EMRS
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ORDERING INFORMATION
Part No.
HY5DV281622DT-33
HY5DV281622DT-36
HY5DV281622DT-4
HY5DV281622DT-5
HY5DV281622DT-6
Rev. 0.5 / Aug. 2003
Power Supply
Clock
Frequency
300MHz
Max Data Rate
600Mbps/pin
550Mbps/pin
500Mbps/pin
400Mbps/pin
333Mbps/pin
interface
Package
V
DD
=3.3V
V
DDQ
=2.5V
275MHz
250MHz
200MHz
166MHz
SSTL-2
400mil 66pin
TSOP-II
3
HY5DV281622DT
PIN DESCRIPTION
PIN
CK, /CK
TYPE
Input
DESCRIPTION
Clock: CK and /CK are differential clock inputs. All address and control input signals are
sampled on the crossing of the positive edge of CK and negative edge of /CK. Output
(read) data is referenced to the crossings of CK and /CK (both directions of crossing).
Clock Enable: CKE HIGH activates, and CKE LOW deactivates internal clock signals, and
device input buffers and output drivers. Taking CKE LOW provides PRECHARGE POWER
DOWN and SELF REFRESH operation (all banks idle), or ACTIVE POWER DOWN (row
ACTIVE in any bank). CKE is synchronous for POWER DOWN entry and exit, and for SELF
REFRESH entry. CKE is asynchronous for SELF REFRESH exit, and for output disable. CKE
must be maintained high throughout READ and WRITE accesses. Input buffers, excluding
CK, /CK and CKE are disabled during POWER DOWN. Input buffers, excluding CKE are
disabled during SELF REFRESH. CKE is an SSTL_2 input, but will detect an LVCMOS LOW
level after Vdd is applied.
Chip Select : Enables or disables all inputs except CK, /CK, CKE, DQS and DM. All com-
mands are masked when CS is registered high. CS provides for external bank selection on
systems with multiple banks. CS is considered part of the command code.
Bank Address Inputs: BA0 and BA1 define to which bank an ACTIVE, Read, Write or PRE-
CHARGE command is being applied.
Address Inputs: Provide the row address for ACTIVE commands, and the column address
and AUTO PRECHARGE bit for READ/WRITE commands, to select one location out of the
memory array in the respective bank. A10 is sampled during a precharge command to
determine whether the PRECHARGE applies to one bank (A10 LOW) or all banks (A10
HIGH). If only one bank is to be precharged, the bank is selected by BA0, BA1. The
address inputs also provide the op code during a MODE REGISTER SET command. BA0
and BA1 define which mode register is loaded during the MODE REGISTER SET command
(MRS or EMRS).
Command Inputs: /RAS, /CAS and /WE (along with /CS) define the command being
entered.
Input Data Mask: DM(LDM,UDM) is an input mask signal for write data. Input data is
masked when DM is sampled HIGH along with that input data during a WRITE access.
DM is sampled on both edges of DQS. Although DM pins are input only, the DM loading
matches the DQ and DQS loading. LDM corresponds to the data on DQ0-Q7; UDM corre-
sponds to the data on DQ8-Q15.
Data Strobe: Output with read data, input with write data. Edge aligned with read data,
centered in write data. Used to capture write data. LDQS corresponds to the data on
DQ0-Q7; UDQS corresponds to the data on DQ8-Q15.
Data input / output pin : Data Bus
Power supply for internal circuits and input buffers.
Power supply for output buffers for noise immunity.
Reference voltage for inputs for SSTL interface.
No connection.
CKE
Input
/CS
Input
BA0, BA1
Input
A0 ~ A11
Input
/RAS, /CAS, /WE
Input
LDM, UDM
Input
LDQS, UDQS
DQ0 ~ DQ15
V
DD
/V
SS
V
DDQ
/V
SSQ
V
REF
NC
I/O
I/O
Supply
Supply
Supply
NC
Rev. 0.5 / Aug. 2003
5
嵌入式系统
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