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Digital Consumer Roadshow 2004:
7400 Logic Replacement
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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)
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Success Drives Proliferation
• New families introduced based on ― Higher performance― Lower power― New features― New signaling threshold
19602003
• Spawned over 32 unique families!
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Too Much of a Good Thing?
• Families• Packages• Reliability options• Speed grades• Features• Functions
An availability nightmare! >> 500K unique devices
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Different Families Don’t all Speak the Same Language
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Sometimes Things Get Lost or Added in the Translation*
Different families aren’t always on speaking terms with one another
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High Performance3.5ns tPD, fmax 303Mhz
Improved features
Low Cost0.18µ = small die size
Lowest cost packaging
Lowest Power12mW*
~20uA typical stand-by
Storage Systems, Routers Set-Top Box, Cell phone Handheld, Portable Equipment
The Ultimate Solution For 7400 Logic Replacement
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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….
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Driving Down Costs Through Process Technology
Feat
ure
Size
(mic
ron)
0.35
0.25
0.18
0.13
0.10
0.071999 2000 2001 2002 2003 2004
CPLDs
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CPLD Vs. Discrete 7400 Total Product Cost
CPLD1985
Discrete CPLD2003
Discrete
Die Cost Test Cost Package Cost
1000 % Reduction in die cost throughsemiconductor process technology
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CPLD2003
Discrete
Die Cost Test Cost Package Cost
Equivalent to > 8Discrete TTL Devices
8
• More:― Logic― Features― Performance― Security― Flexibility
• For Less― Price― Board Area― Power― EMI
Xilinx CPLDs Offer More for Less
These are the fundamentals behind the death of the 7400 series…
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The CPLD Cost Advantage
CPLD Price Advantage
Device Cost Comparison 7400 vs. CPLD
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Cost Advantage Case Study- PVR -
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ICs Inside the Box
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Clock
DiscreteLogic
µP control
Buffers/Drivers
Peripheral
BOM Analysis
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Buffers/
Drivers
Discrete Logic
Watchdog Timer
Peripheral - UART
Low Power, Low Cost
Additional Logic, IO and
System Resources
Discrete components cost: $5.73XC2C128 - $4.60Saved: $1.13
7400 Replacement Solution
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Save $1.13
Reducing the Overall BOMSo
lutio
n C
ost
$0.91
Standard Solutions
Discrete Logic Chips $0.91*
Watchdog Timer $1.05*
Coolrunner-II Solution
$4.60
UART $2.20*
Buffers / Drivers
$2.57*
$1.96
$3.16
$5.73
XC2C128VQ100C
250KU Pricing
* High-volume pricing estimate
Additional features using
Programmable Logic for FREE !!
Additional features using
Programmable Logic for FREE !!Re-programmability
Performance
Power Savings
Additional Logic
Time-to-market
Board Area
Additional Memory
Additional I/O
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Cost Advantage Case StudyInstrumentation
(1) (2)(2)(2) (2)(1)
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Cost Advantage Case StudyGPS PDA
(4)
(1)
(1)
(1)
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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
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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
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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
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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
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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!
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The Ultimate Advantage- Reprogrammability -
• CoolRunner-II CPLDs can be programmed at any phase of product life-cycle― Prototyping, field trials, and in market
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The World of TTL
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Logic Cell Estimation Errors
X X
X
XXX
X
1 Macrocell Utilized vs. Four
• Unused Gates in Package• Synthesized to 1 Macrocell
Unused Logic Device Functionality
Logic Cell Estimator Guarantees that Results will be as Good or Better than Estimated Savings Value