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Part: M2S56D20AKT-75A
Category:
Memory
-> DRAM
-> DDR SDRAM
-> 256 Mb
Description:
Company: Mitsubishi Electronics America, Inc.
Datasheet: Download M2S56D20AKT-75A datasheet File size : 41 kB
Request For quote: Find where to buy M2S56D20AKT-75A
Datasheet text preview:
DDR SDRAM (Rev.1.01) Oct. '01 Preliminary
MITSUBISHI LSIs
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
PRELIMINARY
Contents are subject to change without notice.
DESCRIPTION
M2S56D20AKT is a 4-bank x 16777216-word x 4-bit, M2S56D30AKT is a 4-bank x 8388608-word x 8-bit, M2S56D40AKT is a 4-bank x 4194304-word x 16-bit,double data rate synchronous DRAM, with SSTL_2 interface. All control and address signals are referenced to the rising edge of CLK. Input data is registered on both edges of data strobes, and output data and data strobe are referenced on both edges of CLK. The M2S56D20/30/40AKT achieve very high speed data rate up to 133MHz, and are suitable for main memory in computer systems.
FEATURES
- Vdd=Vddq=2.5V+0.2V - Double data rate architecture; two data transfers per clock cycle - Bidirectional, data strobe (DQS) is transmitted/received with data - Differential clock inputs (CLK and /CLK) - DLL aligns DQ and DQS transitions - Commands are entered on each positive CLK edge - Data and data mask are referenced to both edges of DQS - 4-bank operations are controlled by BA0, BA1 (Bank Address) - /CAS latency- 2.0/2.5 (programmable) - Burst length- 2/4/8 (programmable) - Burst type- sequential / interleave (programmable) - Auto precharge / All bank precharge is controlled by A10 - 8192 refresh cycles /64ms (4 banks concurrent refresh) - Auto refresh and Self refresh - Row address A0-12 / Column address A0-9,11(x4)/ A0-9(x8)/ A0-8(x16) - SSTL_2 Interface - 10.65mm width x 13.1mm length, 64pin sTSOP(II) with 0.4mm lead pitch
Operating Frequencies
Speed Grade -7 5 A -7 5 -1 0 Clock Rate CL=2 * 1 3 3 MHz 1 0 0 MHz 1 0 0 MHz CL=2.5 * 1 3 3 MHz 1 3 3 MHz 1 2 5 MHz * CL = CAS(Read) Latency
MITSUBISHI ELECTRIC
1
DDR SDRAM (Rev.1.01) Oct. '01 Preliminary
MITSUBISHI LSIs
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM PIN CONFIGURATION(TOP VIEW) X4 X8 X 16
VDD VDD VDD NC DQ0 DQ0 VDDQ VDDQ VDDQ NC NC DQ1 DQ0 DQ1 DQ2 VSSQ VSSQ VSSQ NC NC DQ3 NC DQ2 DQ4 VDDQ VDDQ VDDQ NC NC DQ5 DQ1 DQ3 DQ6 VSSQ VSSQ VSSQ NC NC DQ7 VDDQ VDDQ VDDQ NC NC LDQS NC NC NC VDD VDD VDD NC NC NC NC NC LDM /WE /WE /WE /CAS /CAS /CAS /RAS /RAS /RAS /C S /C S /C S NC NC NC BA0 BA0 BA0 BA1 BA1 BA1 A10/AP A10/AP A10/AP A0 A0 A0 A1 A1 A1 A2 A2 A2 A3 A3 A3 VDD VDD VDD
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 28 29 30 31 32
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
VSS DQ15 VSSQ DQ14 DQ13 VDDQ DQ12 DQ11 VSSQ DQ10 DQ9 VDDQ DQ8 VSSQ UDQS NC VREF VSS UDM /CLK CLK CKE NC A12 A11 A9 A8 A7 A6 A5 A4 VSS
VSS DQ7 VSSQ NC DQ6 VDDQ NC DQ5 VSSQ NC DQ4 VDDQ NC VSSQ DQS NC VREF VSS DM /CLK CLK CKE NC A12 A11 A9 A8 A7 A6 A5 A4 VSS
VSS NC VSSQ NC DQ3 VDDQ NC NC VSSQ NC DQ2 VDDQ NC VSSQ DQS NC VREF VSS DM /CLK CLK CKE NC A12 A11 A9 A8 A7 A6 A5 A4 VSS
64pin STSOP
CLK,/CLK CKE /CS /RAS /CAS / WE DQ0 -7 DQS DM Vref
: Master Clock : Clock Enable : Chip Select : Row Address Strobe : Column Address Strobe : Write Enable : Data I/O : Data Strobe : Write Mask : Reference Voltage
PIN PITCH 0.4 mm
A0 -1 2 BA0,1 Vdd VddQ Vss VssQ
: Address Input : Bank Address Input : Power Supply : Power Supply for Output : Ground : Ground for Output
MITSUBISHI ELECTRIC
2
DDR SDRAM (Rev.1.01) Oct. '01 Preliminary
MITSUBISHI LSIs
M2S56D20/ 30/ 40AKT
256M Double Data Rate Synchronous DRAM
PIN FUNCTION
SYMBOL TYPE DESCRIPTION Clock: CLK and /CLK are differential clock inputs. All address and control input signals are sampled on the crossing of the positive edge of CLK and negative edge of /CLK. Output (read) data is referenced to the crossings of CLK and /CLK (both directions of crossing). Clock Enable: CKE controls internal clock. When CKE is low, internal clock for the following cycle is ceased. CKE is also used to select auto / self refresh. After self refresh mode is started, CKE becomes asynchronous input. Self refresh is maintained as long as CKE is low. Chip Select: When /CS is high, any command means No Operation. Combination of /RAS, /CAS, /WE defines basic commands. A0 -11 specify the Row / Column Address in conjunction with BA0,1. The Row Address is specified by A0-12. The Column Address is specified by A0-9,11(x4), A0-9(x8) and A0-8(x16). A10 is also used to indicate precharge option. When A10 is high at a read / write command, an auto precharge is performed. When A10 is high at a precharge command, all banks are precharged. Bank Address: BA0,1 specifies one of four banks to which a command is applied. BA0,1 must be set with ACT, PRE, READ, WRITE commands. Data Input/Output: Data bus Data Strobe: Output pin during Read operation, input pin during Write operation. Edge-aligned with read data, placed at the centered of write data to capture the write data. For the x16, LDQS corresponds to the data on DQ0-DQ7; UDQS correspond to the data on DQ8-DQ15. Input Data Mask: DM is an input mask signal for write data. Input data is masked when DM is sampled HIGH along with the input data during a WRITE operations. DM is sampled on both edges of DQS. Although DM pins are input only, the DM loading matches the DQ and DQS loading. For the x16, LDM corresponds to the data on DQ0-DQ7; UDM corresponds to the data on DQ8-DQ15. Power Supply for the memory array and peripheral circuitry. VddQ and VssQ are supplied to the Output Buffers only. SSTL_2 reference voltage.
CLK, /CLK
Input
CKE
Input
/C S /RAS, /CAS, /WE
Input Input
A0 -1 2
Input
BA0,1 DQ0 -15(x16), DQ0 -7(x8), DQ0 -3(x4), DQS
Input
Input / Output
Input / Output
DM
Input
Vdd, Vss VddQ, VssQ Vref
Power Supply Power Supply Input
MITSUBISHI ELECTRIC
3
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