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TMS44400PDGA Datasheet(PDF) 10 Page - Texas Instruments |
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TMS44400PDGA Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page TMS44400, TMS44400P, TMS46400, TMS46400P 1048576-WORD BY 4-BIT DYNAMIC RANDOM-ACCESS MEMORIES SMHS562C – MAY 1995 – REVISED NOVEMBER 1996 10 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 timing requirements over recommended ranges of supply voltage and operating free-air temperature (continued) ’4x400 - 60 ’4x400P - 60 ’4x400 - 70 ’4x400P - 70 ’4x400 - 80 ’4x400P - 80 UNIT MIN MAX MIN MAX MIN MAX UNIT tROH Hold time, RAS referenced to OE 10 10 10 ns tAWD Delay time, column address to W low (read-write operation only) 55 63 70 ns tCHR Delay time, RAS low to CAS high (CBR refresh only) 10 10 10 ns tCRP Delay time, CAS high to RAS low 0 0 0 ns tCSH Delay time, RAS low to CAS high 60 70 80 ns tCSR Delay time, CAS low to RAS low (CBR refresh only) 5 5 5 ns tCWD Delay time, CAS low to W low (read-write operation only) 40 46 50 ns tRAD Delay time, RAS low to column address (see Note 15) 15 30 15 35 15 40 ns tRAL Delay time, column address to RAS high 30 35 40 ns tCAL Delay time, column address to CAS high 30 35 40 ns tRCD Delay time, RAS low to CAS low (see Note 15) 20 45 20 52 20 60 ns tRPC Delay time, RAS high to CAS low 0 0 0 ns tRSH Delay time, CAS low to RAS high 15 18 20 ns tRWD Delay time, RAS low to W low (read-write operation only) 85 98 110 ns tTAA Access time from address (test mode) 35 40 45 ns tTCPA Access time from column precharge (test mode) 40 45 50 ns tTRAC Access time from RAS (test mode) 65 75 85 ns tREF Refresh time interval ’4x400 16 16 16 ms tREF Refresh time interval ’4x400P 128 128 128 ms tT Transition time 2 30 2 30 2 30 ns NOTE 15: The maximum value is specified only to ensure access time. PARAMETER MEASUREMENT INFORMATION 1.31 V VCC = 5 V CL = 100 pF (see Note A) Output Under Test Output Under Test CL = 100 pF (see Note A) (b) ALTERNATE LOAD CIRCUIT (a) LOAD CIRCUIT RL = 218 Ω R1 = 828 Ω R2 = 295 Ω NOTE A: CL includes probe and fixture capacitance. Figure 2. Load Circuits for Timing Parameters |
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