The 7400 Series – A Brief History - • 1960s space program drove development of 7400 series • Consumed all available devices for internal flight computer • $1000 / device (1960 dollars) • 10:1 integration improvement over discrete transistors • 1963 Minuteman missile forced 7400 into mass production • Drove pricing down to $25 / circuit (1963 dollars)
Success Drives Proliferation • New families introduced based on • Higher performance • Lower power • New features • New signaling threshold 2003 1960 • Spawned over 32 unique families!
Families Packages Reliability options Speed grades Features Functions Too Much of a Good Thing? An availability nightmare! >> 500K unique devices
Sometimes Things Get Lost or Added in the Translation* Different families aren’t always on speaking terms with one another
The Ultimate Solution For 7400 Logic Replacement Lowest Power 12mW* ~20uA typical stand-by Low Cost 0.18µ = small die size Lowest cost packaging High Performance 3.5ns tPD, fmax 303Mhz Improved features Storage Systems, Routers Handheld, Portable Equipment Set-Top Box, Cell phone
Eliminate Availability & Obsolescence Issues • Over >> 500,000 different 7400 devices addressed in one package! • Nothing needs to get “lost or added in the translation” • AND Additional features for free • EMI management, system clocking, reprogrammability, design security….
Driving Down Costs Through Process Technology 0.35 0.25 0.18 0.13 0.10 0.07 CPLDs Feature Size (micron) 1999 2000 2001 2002 2003 2004
CPLD Vs. Discrete 7400 Total Product Cost 1000 % Reduction in die cost throughsemiconductor process technology
Xilinx CPLDs Offer More for Less • More: • Logic • Features • Performance • Security • Flexibility • For Less • Price • Board Area • Power • EMI 8 Equivalent to > 8 Discrete TTL Devices These are the fundamentals behind the death of the 7400 series…
The CPLD Cost Advantage Device Cost Comparison 7400 vs. CPLD CPLD Price Advantage
BOM Analysis Clock µP control Buffers/ Drivers Discrete Logic Peripheral
7400 Replacement Solution Low Power, Low Cost Buffers/ Drivers Discrete Logic Additional Logic, IO and System Resources Watchdog Timer Peripheral - UART Discrete components cost: $5.73 XC2C128 - $4.60 Saved: $1.13
Re-programmability Time-to-market Board Area Power Savings Performance Additional I/O Additional Logic Additional Memory Save $1.13 Reducing the Overall BOM Additional features using Programmable Logic for FREE !! 250KU Pricing * High-volume pricing estimate Solution Cost $5.73 Buffers / Drivers $2.57* $3.16 UART $2.20* $1.96 $4.60 XC2C128 VQ100C $1.05* Watchdog Timer $0.91 Discrete Logic Chips $0.91* Coolrunner-II Solution Standard Solutions
Cost Advantage Case StudyInstrumentation (2) (1) (2) (2) (2) (1)
Cost Advantage Case StudyGPS PDA (1) (4) (1) (1)
CoolRunner-II Changes the Equation • Lower cost, higher integration than 7400 TTL • Additional features that manage real world issues • EMI • System clocking • Design security • Obsolescence / availability • Reduced test costs • External interfacing components eliminated • In field bug fixes, upgrades, changes
Managing EMI CoolRunner-II Benefits • Typically considered “black magic” • Significant TTM impact to achieve compliance • Board spins, test time etc. • CoolRunner-II features and integration benefits address EMI • Programmable drive strength, I/O signaling, programmable ground, programmable slew rate, PLLs
CoolRunner-IIDesign Security • 7400 series has no inherent means to thwart reverse engineering • Remove device marking? • CoolRunner-II • Programmable bit stream security • Prevents both over-writing or readback • Four levels of on-chip-security • Tampering causes device to automatically lock down
Reduced Test Costs • CPLD integration reduces “bed of nails” test time • Reduced points to interrogate • Reduced device count significantly increases FITs • Mis-aligned / wrong part placement • Soldering failure • CoolRunner-II JTAG test port – “free” allows for PCB testing • Inherent programmability provides 100% test coverage
CoolRunner-IISimplified Interfacing • Additional components for interfacing disparate 7400 logic families • Pull up resistors etc. • Additional components typically required to communicate with interface logic • Bus transceivers, high performance memory interfaces, slow slew rate signaling • CoolRunner-II programmable I/O eliminates need for external interface devices • Programmable HSTL, SSTL, Schmitt Trigger etc. • Considerable board area and cost savings!
The Ultimate Advantage- Reprogrammability - • CoolRunner-II CPLDs can be programmed at any phase of product life-cycle • Prototyping, field trials, and in market
1 Macrocell Utilized vs. Four • Unused Gates in Package • Synthesized to 1 Macrocell X X X X X X X Logic Cell Estimation Errors Unused Logic Device Functionality Logic Cell Estimator Guarantees that Results will be as Good or Better than Estimated Savings Value