128M DDR SDRAM K4D261638E 128Mbit DDR SDRAM 2M x 16Bit x 4 Banks Double Data Rate Synchronous DRAM Revision 1.2 July 2003 Samsung Electronics reserves the right to change products or specification without notice. - 1 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E Revision History Revision 1.2 (July 21, 2003) • Added K4D261638E-TC2A in the spec Revision 1.1 (January 16, 2003) • Changed ICC6 from 2mA to 4mA • Changed ICC5 of K4D261638E-TC33 from 260mA to 320mA • Changed ICC5 of K4D261638E-TC36 from 250mA to 310mA • Changed ICC5 of K4D261638E-TC40 from 230mA to 290mA • Changed ICC5 of K4D261638E-TC50 from 210mA to 270mA Revision 1.0 (December 24, 2002) • Defined DC spec • Changed tRC of K4D261638E-TC33/36 from 13tCK to 15tCK • Changed tRFC of K4D261638E-TC33/36 from 15tCK to 17tCK • Changed tRAS of K4D261638E-TC33/36 from 9tCK to 10tCK • Changed tRP of K4D261638E-TC33/36 from 4tCK to 5tCK • Changed tDAL of K4D261638E-TC33/36 from 7tCK to 8tCK Revision 0.3 (December 3, 2002) - Target Spec • Typo corrected Revision 0.2 (November 12, 2002) - Target Spec • Changed tPDEX of K4D261638E-TC33/36/40/50 from 1tCK+tIS to 3tCK+tIS Revision 0.1 (November 7, 2002) - Target Spec • Changed tCK(max) of K4D261638E-TC33 from 4ns to 10ns • Changed tCK(max) of K4D261638E-TC36 from 6ns to 10ns • Typo corrected Revision 0.0 (October 28, 2002) - Target Spec • Defined Target Specification - 2 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E 2M x 16Bit x 4 Banks Double Data Rate Synchronous DRAM with Bi-directional Data Strobe and DLL FEATURES • 2.5V + 5% power supply for device operation • 2 DQS’s ( 1DQS / Byte ) • 2.5V + 5% power supply for I/O interface • Data I/O transactions on both edges of Data strobe • SSTL_2 compatible inputs/outputs • DLL aligns DQ and DQS transitions with Clock transition • 4 banks operation • Edge aligned data & data strobe output • MRS cycle with address key programs • Center aligned data & data strobe input -. Read latency 3, 4 (clock) • DM for write masking only -. Burst length (2, 4 and 8) • Auto & Self refresh -. Burst type (sequential & interleave) • 32ms refresh period (4K cycle) • All inputs except data & DM are sampled at the positive • 66pin TSOP-II • Maximum clock frequency up to 350MHz going edge of the system clock • Maximum data rate up to 700Mbps/pin • Differential clock input • No Wrtie-Interrupted by Read Function ORDERING INFORMATION Part NO. Max Freq. Max Data Rate K4D261638E-TC2A 350MHz 700Mbps/pin K4D261638E-TC33 300MHz 600Mbps/pin K4D261638E-TC36 275MHz 550Mbps/pin K4D261638E-TC40 250MHz 500Mbps/pin K4D261638E-TC50 200MHz 400Mbps/pin Interface Package SSTL_2 66pin TSOP-II For the K4D261638E-TC2A, VDD & VDDQ = 2.8V+0.1V GENERAL DESCRIPTION FOR 2M x 16Bit x 4 Bank DDR SDRAM The K4D261638E is 134,217,728 bits of hyper synchronous data rate Dynamic RAM organized as 4 x 2,097,152 words by 16 bits, fabricated with SAMSUNG’s high performance CMOS technology. Synchronous features with Data Strobe allow extremely high performance up to 1.4GB/s/chip. I/O transactions are possible on both edges of the clock cycle. Range of operating frequencies, programmable burst length and programmable latencies allow the device to be useful for a variety of high performance memory system applications. - 3 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E PIN CONFIGURATION (Top View) VDD 1 66 VSS DQ0 2 65 DQ15 VDDQ 3 64 VSSQ DQ1 4 63 DQ14 DQ2 5 62 DQ13 VSSQ 6 61 VDDQ DQ3 7 60 DQ12 DQ4 8 59 DQ11 VDDQ 9 58 VSSQ DQ5 10 57 DQ10 DQ6 11 56 DQ9 VSSQ 12 55 VDDQ DQ7 13 54 DQ8 NC 14 53 NC VDDQ 15 52 VSSQ LDQS 16 51 UDQS NC 17 50 NC VDD 18 49 VREF NC 19 48 VSS LDM 20 47 UDM WE 21 46 CK CAS 22 45 CK RAS 23 44 CKE CS 24 43 NC NC 25 42 NC BA0 26 41 A11 BA1 27 40 A9 AP/A10 28 39 A8 A0 29 38 A7 A1 30 37 A6 A2 31 36 A5 A3 32 35 A4 VDD 33 34 VSS 66 PIN TSOP(II) (400mil x 875mil) (0.65 mm Pin Pitch) PIN DESCRIPTION CK,CK Differential Clock Input BA0, BA1 Bank Select Address CKE Clock Enable A0 ~A11 Address Input CS Chip Select DQ0 ~ DQ15 Data Input/Output RAS Row Address Strobe VDD Power CAS Column Address Strobe VSS Ground WE Write Enable VDDQ Power for DQ’s L(U)DQS Data Strobe VSSQ Ground for DQ’s L(U)DM Data Mask NC No Connection RFU Reserved for Future Use - 4 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E INPUT/OUTPUT FUNCTIONAL DESCRIPTION Symbol Type Function Input The differential system clock Input. All of the inputs are sampled on the rising edge of the clock except DQ’s and DM’s that are sampled on both edges of the DQS. CKE Input Activates the CK signal when high and deactivates the CK signal when low. By deactivating the clock, CKE low indicates the Power down mode or Self refresh mode. CS Input CS enables the command decoder when low and disabled the command decoder when high. When the command decoder is disabled, new commands are ignored but previous operations continue. RAS Input Latches row addresses on the positive going edge of the CK with RAS low. Enables row access & precharge. CAS Input Latches column addresses on the positive going edge of the CK with CAS low. Enables column access. WE Input Enables write operation and row precharge. Latches data in starting from CAS, WE active. Input/Output Data input and output are synchronized with both edge of DQS. For the x16, LDQS corresponds to the data on DQ0-DQ7 ; UDQS corresponds to the data on DQ8-DQ15. Input Data in Mask. Data In is masked by DM Latency=0 when DM is high in burst write. For the x16, LDM corresponds to the data on DQ0-DQ7 ; UDM correspons to the data on DQ8-DQ15. Input/Output Data inputs/Outputs are multiplexed on the same pins. BA0, BA1 Input Selects which bank is to be active. A0 ~ A11 Input Row/Column addresses are multiplexed on the same pins. Row addresses : RA0 ~ RA11, Column addresses : CA0 ~ CA8. VDD/VSS Power Supply Power and ground for the input buffers and core logic. VDDQ/VSSQ Power Supply Isolated power supply and ground for the output buffers to provide improved noise immunity. VREF Power Supply Reference voltage for inputs, used for SSTL interface. No connection/ Reserved for future use This pin is recommended to be left "No connection" on the device CK, CK*1 LDQS,UDQS LDM,UDM DQ0 ~ DQ15 NC/RFU *1 : The timing reference point for the differential clocking is the cross point of CK and CK. For any applications using the single ended clocking, apply VREF to CK pin. - 5 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E BLOCK DIAGRAM (2Mbit x 16I/O x 4 Bank) 16 Intput Buffer I/O Control CK, CK Data Input Register Serial to parallel Bank Select LWE LDMi 2Mx16 16 Output Buffer 2Mx16 32 2-bit prefetch Sense AMP Row Decoder Refresh Counter Row Buffer ADDR Address Register CK,CK 2Mx16 x16 DQi 2Mx16 Column Decoder Col. Buffer LCBR LRAS Latency & Burst Length Strobe Gen. Programming Register DLL LCKE LRAS LCBR Data Strobe LWE LCAS LWCBR CK,CK LDMi Timing Register CK,CK CKE CS RAS CAS WE - 6 - LDM UDM Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E FUNCTIONAL DESCRIPTION • Power-Up Sequence DDR SDRAMs must be powered up and initialized in a predefined manner to prevent undefined operations. 1. Apply power and keep CKE at low state (All other inputs may be undefined) - Apply VDD before VDDQ . - Apply VDDQ before VREF & VTT 2. Start clock and maintain stable condition for minimum 200us. 3. The minimum of 200us after stable power and clock(CK,CK ), apply NOP and take CKE to be high . 4. Issue precharge command for all banks of the device. 5. Issue a EMRS command to enable DLL *1 6. Issue a MRS command to reset DLL. The additional 200 clock cycles are required to lock the DLL. *1,2 7. Issue precharge command for all banks of the device. 8. Issue at least 2 or more auto-refresh commands. 9. Issue a mode register set command with A8 to low to initialize the mode register. *1 The additional 200cycles of clock input is required to lock the DLL after enabling DLL. *2 Sequence of 6&7 is regardless of the order. Power up & Initialization Sequence 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ~ precharge ALL Banks EMRS MRS DLL Reset 1st Auto Refresh precharge ALL Banks ~ tRP tRFC tRFC 200 Clock min. Inputs must be stable for 200us 2nd Auto Refresh ~ ~ 2 Clock min. 2 Clock min. Mode Register Set Any Command ~ 2 Clock min. ~ ~ tRP Command ~ CK,CK * When the operating frequency is changed, DLL reset should be required again. After DLL reset again, the minimum 200 cycles of clock input is needed to lock the DLL. - 7 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E MODE REGISTER SET(MRS) The mode register stores the data for controlling the various operating modes of DDR SDRAM. It programs CAS latency, addressing mode, burst length, test mode, DLL reset and various vendor specific options to make DDR SDRAM useful for variety of different applications. The default value of the mode register is not defined, therefore the mode register must be written after EMRS setting for proper operation. The mode register is written by asserting low on CS, RAS, CAS and WE(The DDR SDRAM should be in active mode with CKE already high prior to writing into the mode register). The state of address pins A0 ~ A11 and BA0, BA1 in the same cycle as CS, RAS, CAS and WE going low is written in the mode register. Minimum two clock cycles are requested to complete the write operation in the mode register. The mode register contents can be changed using the same command and clock cycle requirements during operation as long as all banks are in the idle state. The mode register is divided into various fields depending on functionality. The burst length uses A0 ~ A2, addressing mode uses A3, CAS latency(read latency from column address) uses A4 ~ A6. A7 is used for test mode. A8 is used for DLL reset. A7,A8, BA0 and BA1 must be set to low for normal MRS operation. Refer to the table for specific codes for various burst length, addressing modes and CAS latencies. BA1 BA0 RFU 0 A11 A10 A9 RFU DLL A8 A8 A7 DLL TM A6 A5 A3 CAS Latency A2 BT A1 A0 Burst Length Address Bus Mode Register Burst Type Test Mode DLL Reset A4 A7 mode A3 Type 0 No 0 Normal 0 Sequential 1 Yes 1 Test 1 Interleave Burst Length CAS Latency BA0 An ~ A0 A6 A5 A4 Latency 0 MRS 0 0 0 Reserved 1 EMRS 0 0 1 Reserved 0 1 0 Reserved 0 1 1 3 1 0 0 4 1 0 1 Reserved 1 1 0 Reserved 1 1 1 Reserved * RFU(Reserved for future use) should stay "0" during MRS cycle. A2 A1 A0 0 0 0 Burst Type Sequential Interleave 0 Reserve Reserve 0 1 2 2 0 1 0 4 4 0 1 1 8 8 1 0 0 Reserve Reserve 1 0 1 Reserve Reserve 1 1 0 Reserve Reserve 1 1 1 Reserve Reserve MRS Cycle 0 1 2 3 4 5 6 7 8 CK, CK Command NOP Precharge All Banks NOP NOP MRS NOP Any Command NOP NOP tMRD=2 tCK tRP *1 : MRS can be issued only at all banks precharge state. *2 : Minimum tRP is required to issue MRS command. - 8 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E EXTENDED MODE REGISTER SET(EMRS) The extended mode register stores the data for enabling or disabling DLL and selecting output driver strength. The default value of the extended mode register is not defined, therefore the extened mode register must be written after power up for enabling or disabling DLL. The extended mode register is written by asserting low on CS, RAS, CAS, WE and high on BA0(The DDR SDRAM should be in all bank precharge with CKE already high prior to writing into the extended mode register). The state of address pins A0, A2 ~ A5, A7 ~ A11 and BA1 in the same cycle as CS, RAS, CAS and WE going low are written in the extended mode register. A1 and A6 are used for setting driver strength to normal, weak or matched impedance. Two clock cycles are required to complete the write operation in the extended mode register. The mode register contents can be changed using the same command and clock cycle requirements during operation as long as all banks are in the idle state. A0 is used for DLL enable or disable. "High" on BA0 is used for EMRS. All the other address pins except A0,A1,A6 and BA0 must be set to low for proper EMRS operation. Refer to the table for specific codes. BA1 BA0 RFU 1 BA0 A11 A10 A9 A8 A7 RFU A6 A5 A4 D.I.C An ~ A0 A6 A1 0 MRS 0 1 1 EMRS 1 1 A3 A2 RFU A1 A0 D.I.C DLL Address Bus Extended Mode Register A0 DLL Enable Weak 0 Enable Matched 1 Disable Output Driver Impedence Control *1 : RFU(Reserved for future use) should stay "0" during EMRS cycle. - 9 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E ABSOLUTE MAXIMUM RATINGS Parameter Symbol Value Unit VIN, VOUT -0.5 ~ 3.6 V Voltage on VDD supply relative to Vss VDD -1.0 ~ 3.6 V Voltage on VDD supply relative to Vss VDDQ -0.5 ~ 3.6 V Storage temperature TSTG -55 ~ +150 °C Power dissipation PD 2.0 W Short circuit current IOS 50 mA Voltage on any pin relative to Vss Note : Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. Functional operation should be restricted to recommended operating condition. Exposure to higher than recommended voltage for extended periods of time could affect device reliability. POWER & DC OPERATING CONDITIONS(SSTL_2 In/Out) Recommended operating conditions(Voltage referenced to VSS=0V, TA=0 to 65°C) Parameter Symbol Min Typ Max Unit Note Device Supply voltage VDD 2.375 2.50 2.625 V 1,7 Output Supply voltage VDDQ 2.375 2.50 2.625 V 1,7 Reference voltage VREF 0.49*VDDQ - 0.51*VDDQ V 2 Termination voltage Vtt VREF-0.04 VREF VREF+0.04 V 3 Input logic high voltage VIH(DC) VREF+0.15 - VDDQ+0.30 V 4 Input logic low voltage VIL(DC) -0.30 - VREF-0.15 V 5 Output logic high voltage VOH Vtt+0.76 - - V IOH=-15.2mA Output logic low voltage VOL - - Vtt-0.76 V IOL=+15.2mA Input leakage current IIL -5 - 5 uA 6 Output leakage current IOL -5 - 5 uA 6 Note : 1. Under all conditions VDDQ must be less than or equal to VDD. 2. VREF is expected to equal 0.50*VDDQ of the transmitting device and to track variations in the DC level of the same. Peak to peak noise on the VREF may not exceed + 2% of the DC value. Thus, from 0.50*VDDQ, VREF is allowed + 25mV for DC error and an additional + 25mV for AC noise. 3. Vtt of the transmitting device must track VREF of the receiving device. 4. VIH(max.)= VDDQ +1.5V for a pulse width and it can not be greater than 1/3 of the cycle rate. 5. VIL(mim.)= -1.5V for a pulse width and it can not be greater than 1/3 of the cycle rate. 6. For any pin under test input of 0V < VIN < VDD is acceptable. For all other pins that are not under test VIN=0V. 7. For the K4D261638E-TC2A, VDD & VDDQ = 2.8V+0.1V - 10 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E DC CHARACTERISTICS Recommended operating conditions Unless Otherwise Noted, TA=0 to 65°C) Version Parameter Symbol Test Condition Unit Note -2A -33 -36 -40 -50 210 200 190 170 Operating Current (One Bank Active) ICC1 Burst Lenth=2 tRC ≥ tRC(min) IOL=0mA, tCC= tCC(min) TBD Precharge Standby Current in Power-down mode ICC2P CKE ≤ VIL(max), tCC= tCC(min) TBD Precharge Standby Current in Non Power-down mode ICC2N CKE ≥ VIH(min), CS ≥ VIH(min), tCC= tCC(min) TBD 100 90 80 70 mA Active Standby Current power-down mode ICC3P CKE ≤ VIL(max), tCC= tCC(min) TBD 80 75 70 65 mA Active Standby Current in in Non Power-down mode ICC3N CKE ≥ VIH(min), CS ≥ VIH(min), tCC= tCC(min) TBD 150 140 130 120 mA Operating Current ( Burst Mode) ICC4 tRC ≥ tRFC(min)tRC ≥ tRFC(min) Page Burst, All Banks activated. TBD 380 360 340 320 mA Refresh Current ICC5 tRC ≥ tRFC(min) TBD 320 310 290 270 mA Self Refresh Current ICC6 CKE ≤ 0.2V TBD 70 mA 1 mA 4 2 mA Note : 1. Measured with outputs open. 2. Refresh period is 32ms. AC INPUT OPERATING CONDITIONS Recommended operating conditions(Voltage referenced to VSS=0V, VDD=2.5V+ 5%, VDDQ=2.5V+ 5%,TA=0 to 65°C) Parameter Symbol Min Typ Max Unit Note Input High (Logic 1) Voltage; DQ VIH VREF+0.35 - - V Input Low (Logic 0) Voltage; DQ VIL - - VREF-0.35 V Clock Input Differential Voltage; CK and CK VID 0.7 - VDDQ+0.6 V 1 Clock Input Crossing Point Voltage; CK and CK VIX 0.5*VDDQ-0.2 - 0.5*VDDQ+0.2 V 2 Note : 1. VID is the magnitude of the difference between the input level on CK and the input level on CK 2. The value of VIX is expected to equal 0.5*VDDQ of the transmitting device and must track variations in the DC level of the same 3. For the K4D261638E-TC2A, VDD & VDDQ = 2.8V+0.1V. - 11 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E AC OPERATING TEST CONDITIONS (VDD=2.5V±5%, TA= 0 to 65°C) Parameter Value Unit Input reference voltage for CK(for single ended) 0.50*VDDQ V CK and CK signal maximum peak swing 1.5 V CK signal minimum slew rate 1.0 V/ns VREF+0.35/VREF-0.35 V VREF V Vtt V Input Levels(VIH/VIL) Input timing measurement reference level Output timing measurement reference level Output load condition Note See Fig.1 1.For the K4D261638E-TC2A, VDD & VDDQ = 2.8V+0.1V. Vtt=0.5*VDDQ RT=50Ω Output Z0=50Ω VREF =0.5*VDDQ CLOAD=30pF (Fig. 1) Output Load Circuit CAPACITANCE (VDD=2.5V, TA= 25°C, f=1MHz) Parameter Symbol Min Max Unit Input capacitance( CK, CK ) CIN1 1.0 5.0 pF Input capacitance(A0~A11, BA0~BA1) CIN2 1.0 4.0 pF Input capacitance ( CKE, CS, RAS,CAS, WE ) CIN3 1.0 4.0 pF Data & DQS input/output capacitance(DQ0~DQ15) COUT 1.0 6.5 pF Input capacitance(DM0 ~ DM3) CIN4 1.0 6.5 pF DECOUPLING CAPACITANCE GUIDE LINE Recommended decoupling capacitance added to power line at board. Parameter Symbol Value Unit Decoupling Capacitance between VDD and VSS CDC1 0.1 + 0.01 uF Decoupling Capacitance between VDDQ and VSSQ CDC2 0.1 + 0.01 uF Note : 1. VDD and VDDQ pins are separated each other. All VDD pins are connected in chip. All VDDQ pins are connected in chip. 2. VSS and VSSQ pins are separated each other All VSS pins are connected in chip. All VSSQ pins are connected in chip. - 12 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E AC CHARACTERISTICS Symbol Parameter -2A -33 -36 -40 -50 Unit Note Min Max Min Max Min Max Min Max Min Max 2.86 10 3.3 10 3.6 10 4.0 - 10 5.0 - 10 ns ns CK high level width 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 tCK CK low level width 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 tCK -0.6 0.6 -0.6 0.6 -0.6 0.6 -0.6 0.6 -0.7 0.7 ns -0.6 0.6 -0.6 0.6 -0.6 0.6 -0.6 0.6 -0.7 0.7 ns - 0.35 - 0.35 - 0.40 - 0.4 - 0.45 ns 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 tCK CK cycle time CL=3 CL=4 tCK tCH tCL DQS out access time from CK tDQSCK Output access time from CK tAC Data strobe edge to Dout edge tDQSQ Read preamble tRPRE Read postamble tRPST CK to valid DQS-in tDQSS DQS-In setup time tWPRES DQS-in hold time tWPREH DQS write postamble tWPST DQS-In high level width tDQSH DQS-In low level width tDQSL Address and Control input setup tIS Address and Control input hold tIH DQ and DM setup time to DQS tDS DQ and DM hold time to DQS tDH Clock half period tHP Data output hold time from DQS tQH 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tCK 0.85 1.15 0.85 1.15 0.85 1.15 0.85 1.15 0.8 1.2 tCK 1 0 - 0 - 0 - 0 - 0 - ns 0.35 - 0.35 - 0.35 - 0.35 - 0.3 - tCK 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tCK 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tCK 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tCK 0.9 - 0.9 - 0.9 - 0.9 - 1.0 - ns 0.9 - 0.9 - 0.9 - 0.9 - 1.0 - ns 0.35 - 0.35 - 0.40 - 0.4 - 0.45 - ns 0.35 - 0.35 - 0.40 - 0.4 - 0.45 - ns - tCLmin or tCHmin - tCLmin or tCHmin - - ns 1 - tHP-0.4 - tHP-0.4 - - ns 1 tCLmin or tCHmin tHP0.35 - tCLmin or tCHmin tHP0.35 tCLmin or tCHmin tHP0.45 Note 1 : - The JEDEC DDR specification currently defines the output data valid window(tDV) as the time period when the data strobe and all data associated with that data strobe are coincidentally valid. - The previously used definition of tDV(=0.35tCK) artificially penalizes system timing budgets by assuming the worst case output vaild window even then the clock duty cycle applied to the device is better than 45/55% - A new AC timing term, tQH which stands for data output hold time from DQS is difined to account for clock duty cycle variation and replaces tDV - tQHmin = tHP-X where . tHP=Minimum half clock period for any given cycle and is defined by clock high or clock low time(tCH,tCL) . X=A frequency dependent timing allowance account for tDQSQmax - 13 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E AC CHARACTERISTICS (I) Parameter Symbol Row cycle time Refresh row cycle time Row active time RAS to CAS delay for Read RAS to CAS delay for Write Row precharge time Row active to Row active Last data in to Row precharge @Normal Precharge Last data in to Row precharge @Auto Precharge Last data in to Read command Col. address to Col. address Mode register set cycle time Auto precharge write recovery + Precharge Exit self refresh to read command -2A -33 -36 -40 -50 Unit Note Min Max Min Max Min Max Min Max Min Max tRC tRFC tRAS tRCDRD tRCDWR tRP tRRD 15 17 10 4 2 5 3 100K - 15 17 10 4 2 5 3 100K - 15 17 10 4 2 5 3 100K - 13 15 9 4 2 4 3 100K - 12 14 8 4 2 4 3 100K - tCK tCK tCK tCK tCK tCK tCK tWR 3 - 3 - 3 - 3 - 3 - tCK 1 tWR_A 3 - 3 - 3 - 3 - 3 - tCK 1 tCDLR tCCD tMRD 3 1 2 - 3 1 2 - 2 1 2 - 2 1 2 - 2 1 2 - tCK tCK tCK 1 tDAL 8 - 8 - 8 - 7 - 7 - tCK tXSR 200 3tCK +tIS 7.8 - 200 3tCK +tIS 7.8 - 200 3tCK +tIS 7.8 - 200 3tCK +tIS 7.8 - 200 3tCK +tIS 7.8 - tCK - ns - us Power down exit time tPDEX Refresh interval time tREF - - - - Note : 1. For normal write operation, even numbers of Din are to be written inside DRAM AC CHARACTERISTICS (II) (Unit : Number of Clock) K4D261638E-TC2A Frequency Cas Latency 350MHz ( 2.86ns ) 4 300MHz ( 3.3ns ) 4 275MHz ( 3.6ns ) 4 250MHz ( 4.0ns ) 3 200MHz ( 5.0ns ) 3 tRC 15 15 15 13 12 tRFC 17 17 17 15 14 tRAS 10 10 10 9 8 tRCDRD tRCDWR 4 2 4 2 4 2 4 2 4 2 tRP 5 5 5 4 4 tRRD 3 3 3 3 3 tDAL 8 8 8 7 7 Unit K4D261638E-TC33 Frequency Cas Latency 300MHz ( 3.3ns ) 4 275MHz ( 3.6ns ) 4 250MHz ( 4.0ns ) 3 200MHz ( 5.0ns ) 3 tRC 15 15 13 12 tRFC 17 17 15 14 tRAS 10 10 9 8 tRCDRD tRCDWR 4 2 4 2 4 2 4 2 tRP 5 5 4 4 tRRD 3 3 3 3 tDAL 8 8 7 7 Unit - 14 - tCK tCK tCK tCK tCK tCK tCK tCK tCK Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E K4D261638E-TC36 Frequency Cas Latency 275MHz ( 3.6ns ) 4 250MHz ( 4.0ns ) 3 200MHz ( 5.0ns ) 3 tRC 15 13 12 tRFC 17 15 14 tRAS 10 9 8 tRCDRD tRCDWR 4 2 4 2 4 2 tRP 5 4 4 tRRD 3 3 3 tDAL 8 7 7 Unit K4D261638E-TC40 Frequency Cas Latency 250MHz ( 4.0ns ) 3 200MHz ( 5.0ns ) 3 tRC 13 12 tRFC 15 14 tRAS 9 8 tRCDRD tRCDWR 4 2 4 2 tRP 4 4 tRRD 3 3 tDAL 7 7 Unit K4D261638E-TC50 Frequency Cas Latency 200MHz ( 5.0ns ) 3 tRC 12 tRFC 14 tRAS 8 tRCDRD tRCDWR 4 2 tRP 4 tRRD 3 tDAL 7 Unit tCK tCK tCK tCK tCK tCK Simplified Timing @ BL=4 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 CK, CK BA[1:0] BAa BAa BAa Ra A10/AP Ra ADDR (A0~A9, Ra A11) Ca BAa BAb Ra Rb Ra Rb BAa BAb Ca Cb WE DQS DQ Da0 Da1 Da2 Da3 Db0 Db1 Db2 Db3 Da0 Da1 Da2 Da3 DM COMMAND ACTIVEA PRECH WRITEA ACTIVEA ACTIVEB WRITEA WRITEB tRCD tRAS tRP tRC Normal Write Burst (@ BL=4) tRRD Multi Bank Interleaving Write Burst (@ BL=4) - 15 - Rev. 1.2 (Jul. 2003) 128M DDR SDRAM K4D261638E PACKAGE DIMENSIONS (66pin TSOP-II) 0.65TYP 0.65±0.08 0.30±0.08 (10×) NOTE 1. ( ) IS REFERENCE 2. [ ] IS ASS’Y OUT QUALITY - 16 - (10.76) 0.075 MAX ] (0.50) (R 5) 0.10 MAX [ 0. ( 4× ) 1.20MAX 0.125 +0.075 -0.035 (R 0 .2 (0.71) (R 0. (10×) ) 1.00±0.10 .1 5 0.05 MIN 22.22±0.10 (R 0 15 ) 0.210±0.05 0.665±0.05 (1.50) 25 ) (0.80) #33 (10×) 0.45~0.75 (1.50) (10×) #1 11.76±0.20 (0.80) #34 10.16±0.10 #66 (0.50) Units : Millimeters 0.25TYP 0×~8× Rev. 1.2 (Jul. 2003)