detail mk4096 pinout and packaging
ti tms4030, dram4k 1973
Detail the MK4096 Pinout and Packaging The MK4096 packed power, ground, six multiplexed address pins, data in, data out, chip select, and the RAS and CAS control pins into…
29,258 technical terms and definitions
ti tms4030, dram4k 1973
Detail the MK4096 Pinout and Packaging The MK4096 packed power, ground, six multiplexed address pins, data in, data out, chip select, and the RAS and CAS control pins into…
ras cas multiplexing, dram4k 1973
Detail MK4096 Timing Specifications Because row and column addresses now arrived sequentially rather than simultaneously, the MK4096's datasheet specified exact timing windows…
dram pin count, dram4k 1973
Introduce the TI TMS4030 as the Competing Part Texas Instruments answered the same 4K-density opportunity with the TMS4030, a competing design that targeted the same generation…
dram cost per bit, dram4k 1973
Compare TMS4030 Design Choices to the MK4096 The TMS4030 reached 4K density using TI's own cell and sense-amplifier design choices, which differed from Mostek's in process detail…
4k dram, dram4k 1973
Map the Mostek-versus-TI Competitive Landscape With the MK4096 and the TMS4030 both on the market, the 4K DRAM generation became a direct commercial contest between Mostek…
mostek mk4096, dram4k 1973
Analyze Yield Economics at 4K Density Quadrupling the number of memory cells on a comparable die made the 4K generation more sensitive to any single defect, since a flaw in one…
ti tms4030, dram4k 1973
Quantify Cost-per-Bit Gains Over the 1K Generation The entire commercial case for the 4K generation rested on cost per bit, the metric system buyers actually compared across…
ras cas multiplexing, dram4k 1973
Establish Multiplexed Addressing as the Industry Standard Once both Mostek and Texas Instruments had proven that multiplexed RAS/CAS addressing solved the pin-count problem at 4K…
dram pin count, dram4k 1973
Explain Second-Sourcing and Pinout Compatibility System buyers in the mid-1970s wanted at least two independent suppliers for any memory part they designed into a product, so that…
dram cost per bit, dram4k 1973
Document the MK4096 Datasheet as the Reference Standard Once the MK4096's pinout, timing, and multiplexed-addressing convention were established in the market, its published…
4k dram, dram4k 1973
Carry Lessons Forward to 16K and Beyond The engineering lesson of the 4K generation, that address-pin count had to be managed with multiplexing rather than simply adding more…
mostek mk4096, dram4k 1973
Close by Naming the 64K Generation as the Next Leap The 4K generation, anchored by Mostek's MK4096 and contested commercially by Texas Instruments' TMS4030, closed the gap between…
dram address multiplexing row column shared pins, log2 n address pins versus package cost pin count, ras cas row address strobe column address strobe sequencing
Why Doubling the Array Four Times Over Threatens to Double the Pins the Package Can't Spare 1. State the Pin-Count Arithmetic a Growing Array Forces Every series this project has…
row address strobe column address strobe active low latch, t_rcd ras to cas delay sense amplifier settling time, ras cas timing cost traded against pin count savings
Tell the Chip Which Half of the Address It Is Looking At 1. Add the Signal the Multiplexing Scheme Was Missing Step 1 showed that the same 8 pins can carry a row address and then…
ras activates entire row simultaneously access transistors, row wide refresh side effect single cell access, ras only cycle deliberate row refresh tool mechanism
One Strobe Touches Every Cell in a Row, Whether You Asked It To or Not 1. Follow RAS Past Addressing Into What It Actually Does to the Array Step 2 treated overline(RAS) as…
row column split r times c determines refresh count, wide rows fewer refresh cycles more sense amp load, refresh overhead t_rc tradeoff row count sense amplifier power
Choose the Array's Shape, and the Refresh Count Falls Out of That Choice 1. Turn Step 3's Row-Wide Refresh Into a Concrete Cycle Count Step 3 established that one…
automated row stepping host triggers refresh generically, refresh overhead fraction r times t_rc over t_ret, responsibility moves to chip where retention physics lives
Let the Chip Remember Which Row Comes Next, So the System Does Not Have To 1. State What Manual Row-Stepping Would Demand of the Host System Step 4 established that a complete…
multiplexed addressing architecture outlives specific numbers, pin count constraint propagated never resolved away, first dram series about periphery not cell interior
Classify and Close: What Every Later DRAM Keeps, and What Was Only 64K's Own Arithmetic 1. Separate the Enduring Mechanism From This Generation's Particular Numbers Every step…
name the manufacturers actually racing this generation, name the manufacturers racing the 64k generation
Name the Manufacturers Actually Racing This Generation Steps 1 through 6 built the 64K generation's addressing-and-refresh architecture from first principles without naming…
adopt page mode reuse what row activation already left, adopt page mode access reusing the activated
Adopt Page Mode: Reuse What Row Activation Already Left Standing Step 3 established that one row activation disturbs an entire row's worth of cells as a side effect of addressing…
build rascas control in gate level timing detail, build the ras cas control logic in
Build RAS/CAS Control in Gate-Level Timing Detail Step 2 established RAS and CAS as two sequential strobes; this step goes one level deeper into exactly how that sequencing is…
ship a separate product the dedicated dram controller chip, ship a dedicated dram controller chip
Ship a Separate Product: the Dedicated DRAM Controller Chip Step 5 automated refresh scheduling on the memory chip itself; a real, commercially distinct alternative existed…
compare three real refresh modes this generation actually supported, compare ras only cas before ras and
Compare Three Real Refresh Modes This Generation Actually Supported Step 5 established that the chip can automate refresh scheduling internally; it did not distinguish between…
measure the soft error problem at actual 64k density, measure alpha particle soft error rates at
Measure the Soft-Error Problem at Actual 64K Density This project's `dram_1968` series named alpha-particle soft errors as a forward-looking mechanism its own cell physics did not…
adopt a system level response parity and error correction, adopt parity and error correction as a
Adopt a System-Level Response: Parity and Error-Correction Coding Step 12 measured a real, non-negligible soft-error rate at this generation's density; rather than waiting for…
evolve the package itself from standard dip to zig, evolve package geometry from dip to zig
Evolve the Package Itself: From Standard DIP to Zig-Zag to Early Memory Modules Step 1 established that pin count, not cell density, threatens to make a growing array…
hold timing margin as clock rates climbed across this, hold timing margin under higher clock rates
Hold Timing Margin as Clock Rates Climbed Across This Generation Step 9 derived the specific RAS/CAS timing margins this architecture requires; as successive parts within this…
scale test and burn in equipment to match 64k, scale burn in and test equipment to
Scale Test and Burn-In Equipment to Match 64K-Era Production Volume Step 12 measured soft-error rates through accelerated testing; a broader test-and-burn-in infrastructure…
confront commoditization the real economics behind the dram chip, confront commoditization in the dram chip wars
Confront Commoditization: the Real Economics Behind the DRAM Chip Wars Step 7 named the manufacturers racing this generation; what that race actually did to pricing and margins…
preview the next generation the same pin count pressure, preview the 256k generation the same pressure
Preview the Next Generation: the Same Pin-Count Pressure Returns at 256K Step 1 opened this series with a pin-count crisis multiplexed addressing resolved for this generation…
pair this generations dram with the microprocessors it actually, pair this generations dram with contemporaneous microprocessors
Pair This Generation's DRAM With the Microprocessors It Actually Served This series has treated the 64K DRAM generation almost entirely on its own terms; the systems that actually…
close this extension classify what the 64k generation leaves, close the extension classifying the generations enduring
Close This Extension: Classify What the 64K Generation Leaves to Every Later One Fourteen additional steps have now named this generation's manufacturers, its performance…
1t1c dram cell trench stacked capacitor transition, dram capacitor area shrinks faster than signal charge requirement, dram scaling 1974 geometry limit leaves the plane for the third dimension
Why a Shrinking Cell Forces the Capacitor Off the Plane: Planar Charge Storage Collapses Under Scaling 1. State the Constraint the 1968 Cell Never Had to Face The 1T1C cell fixes…
trench versus stacked capacitor dram 3d cell geometry, dram scaling substrate trench punchthrough vs stacked topography, 1t1c capacitor area perimeter height product third dimension
Step 2 — Choose Between Etching Down (Trench) and Building Up (Stacked): Two Geometries for the Third Dimension 1. The Fundamental Fork: Substrate Etching vs. Over-Gate…
deep reactive ion etch trench capacitor aspect ratio limits, dram trench sidewall capacitance scales with etch depth, aspect ratio dependent etching arde and void free fill dram
Step 3 — Build the Trench: Etch Depth as the New Area Budget 1. Sidewall Area Replaces Planar Pitch By cutting a high-aspect-ratio vertical cavity into the silicon substrate…
stacked capacitor crown cylinder hsg poly storage node dram, stacked dram alpha soft error immunity dielectric isolated, stacked capacitor topography step height depth of focus
Step 4 — Build the Stacked Capacitor: Rising Above the Transistor 1. Climbing Vertically into the Free Space Above the Gate Rather than excavating deep into the fragile silicon…
trench versus stacked quantitative aspect ratio comparison dram, why dram industry forked trench versus stacked capacitor camps, dram storage capacitance 35 femtofarad area budget comparison
Step 5 — Compare the Two Geometries on the Same Electrical Terms: Why the Industry Forked 1. Equalizing the Electrical Baseline: The 35 fF Target When trench and stacked…
trench dram buried plate oxide collar parasitic punchthrough, vertical parasitic mosfet suppression buried strap dram, trench to trench bulk punchthrough depletion merge isolation
Step 6 — Isolate the Trench Capacitor From the Substrate: Buried Plates and Oxide Collars 1. The Parasitic Perils of a Shared Silicon Bulk Because the trench capacitor is carved…
trench dram keyhole void pinch off knudsen diffusion limit, conformal lpcvd dielectric and polysilicon trench fill dram, step coverage aspect ratio dependent deposition dram yield
Step 7 — Fill the Trench Without Leaving a Void: Conformal Deposition and the Pinch-Off Limit 1. Knudsen Diffusion and the Threat of Premature Pinch-Off Once a high-aspect-ratio…
chemical mechanical polishing preston equation dram global planarity, stacked dram array periphery step height depth of focus loss, bpsg reflow vs oxide cmp planarization stacked capacitor dram
Step 8 — Planarize the Stacked Capacitor for the Layers Above It: Chemical Mechanical Polishing and Global Planarity 1. The Topographic Cliff Between Memory Array and Peripheral…
trench vs stacked cost accounting femtofarad per mask dram, dram process steps mask count cmp vs deep rie capital cost, storage capacitance yield figure of merit fab economics dram
Step 9 — Measure the Payoff: Capacitance Recovered Per Unit of Process Complexity 1. The Cost-Accounting of 3D Charge Storage Escaping the planar scaling crisis required adding…
dennard scaling breakdown 3d capacitor evolution dram, trench vs stacked legacy 3d semiconductor architecture dram, when planar physics failed 3d dimension solved moore law
Step 10 — The 1974 Retrospective: When Leaving the Plane Became the Only Way Forward 1. The Immutable Circuit Law and the Collapse of Two Dimensions Robert Dennard’s 1968 1T1C…
name the generation this fork actually served 64k through, name the generation this fork actually served
Name the Generation This Fork Actually Served: 64K Through 1M DRAM The trench-versus-stacked fork this series built in the abstract across Steps 2 through 8 was not a theoretical…
measure how the forks two geometries differ on alpha, measure soft error sensitivity trench versus stacked
Measure How the Fork's Two Geometries Differ on Alpha-Particle Soft-Error Sensitivity This project's `dram_1968` series named the alpha-particle soft-error mechanism as…
trace the equipment that made the trench paths aspect, trace deep reactive ion etch equipment evolution
Trace the Equipment That Made the Trench Path's Aspect Ratio Possible at All Step 3 built the trench capacitor by etching down into the substrate; it did not address what made…
confront the stacked paths own new problem cell to, confront stacked capacitor cell to cell coupling
Confront the Stacked Path's Own New Problem: Cell-to-Cell Capacitive Coupling Step 4 built the stacked capacitor by rising above the transistor rather than etching below it; that…
adopt a second lever beyond geometry high permittivity dielectrics, adopt high k dielectrics beyond geometry alone
Adopt a Second Lever Beyond Geometry: High-Permittivity Dielectrics Everything this series built through Step 10 recovered capacitance by changing a capacitor's shape — depth…
texture the stacked capacitors own surface hemispherical grain polysilicon, texture stacked capacitor surfaces with hemispherical grain
Texture the Stacked Capacitor's Own Surface: Hemispherical-Grain Polysilicon Step 15 named high-permittivity dielectrics as one lever beyond pure geometry; the stacked path also…
weigh the industrial strategy behind each side of the, weigh industrial strategy trench versus stacked alliances
Weigh the Industrial Strategy Behind Each Side of the Fork Step 11 named which real companies chose which geometry; this step asks why, treating the choice as a strategic bet…
trace the refresh power cost that grows as this, trace refresh power cost as capacitance shrinks
Trace the Refresh-Power Cost That Grows as This Series' Own Capacitance Shrinks This project's `dram_1968` series established refresh as an obligation tied to leakage…