MC68340CAB25E - 32-Bit CPU32 MPU 25MHz DMA Timer | NXP/Freescale
MPN: MC68340CAB25E ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.5 | $38.50 |
| 10 | $32.4 | $324.00 |
| 100 | $26.75 | $2,675.00 |
| 500 | $22.1 | $11,050.00 |
| 1,000 | $19.85 | $19,850.00 |
MC68340CAB25E Overview
Background - What is a CPU32 microprocessor? A CPU32 is a 32-bit CISC (Complex Instruction Set Computer) microprocessor from the Freescale/NXP M68000 lineage, the direct architectural successor to the original MC68000. It executes the M68K instruction set in 32-bit form while remaining object-code compatible with older 68000/68010/68020 software. CPU32 parts such as the MC68340 family integrate not only the processor core but also system peripherals (DMA, timers, serial, chip-select logic), reducing the part count for embedded industrial designs. The MC68340 sits inside the broader hierarchy MPU -> microprocessor -> 32-bit embedded controller -> industrial computing subsystem.
Key features include the CPU32 core, two 32-bit DMA channels, dual 16-bit general-purpose timers (T1/T2), a serial communication port (SCP), a serial peripheral interface (QSPI in some mask sets), eight chip-select outputs with wait-state logic, a 16-bit data bus mode for memory-cost optimization, and a fully static CMOS design that supports DC-to-25 MHz operation. The bus is multiplexed, and the part supports DRAM refresh via internal controllers.
Typical applications are industrial control, telecommunications line cards, factory automation, medical instrumentation, point-of-sale terminals, military/aerospace systems, and legacy embedded designs that require deterministic 68K software compatibility. The 144-CQFP package is well-suited to through-hole or socketed industrial assemblies and is rated over the standard -40C to +85C industrial temperature range.
When designing with the MC68340, ensure the external bus is properly terminated, the DRAM controller is initialized before bus cycles begin, and the reset configuration mode pins are pulled to the correct levels during power-up. Designers migrating new designs away from this family should consider ColdFire MC68SECC608 or modern ARM Cortex-M parts - per NXP community guidance, no pin-to-pin drop-in replacement exists.
This page synthesizes distributor stock signals, parametric alternatives (none drop-in per NXP), lifecycle/EOL context, and practical design notes that are not consolidated in a single manufacturer document.
Drop-in alternatives for MC68340CAB25E — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MC68340CAB25E (same form factor and footprint) — differing in Core Architecture, Core Processor, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68340CAB20E
✅ Drop-In📋 Reference alternative (not in catalog)
MC68340CAB16E
✅ Drop-In📋 Reference alternative (not in catalog)
MC68340AB25E
✅ Drop-In📋 Reference alternative (not in catalog)
MC68340CAB25E Maximum Ratings & Electrical Characteristics
| Core Processor | CPU32 (M68000 family) |
| Core Architecture | M68000-compatible 32-bit CISC |
| Bus Width | 32-bit (16-bit mode optional) |
| Number of Cores | 1 |
| Speed (Clock Frequency) | 25 MHz |
| DMA Channels | 2 x 32-bit |
| Timers | 2 x 16-bit (T1, T2) |
| Serial Communication | SCP + QSPI |
| Chip Selects | 8 (programmable wait states) |
| Memory Controller | DRAM refresh + chip-select logic |
| Package | 144-CQFP (28x28 mm, QFP-144) |
| Mounting Type | Surface Mount / Socket |
| Process Technology | CMOS, fully static |
MC68340CAB25E Pin Configuration
| Pin 1 | [DATA_NEEDED] — Pin assignment requires official datasheet - 144-CQFP pinout not in verified source |
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| Pin 144 | [DATA_NEEDED] — Pin assignment requires official datasheet |
Typical Applications
MC68340CAB25E is suitable for 6 applications: Industrial Process Control, Telecommunications Line Cards, Medical Instrumentation, Point-of-Sale Terminals, Legacy Aerospace / Military Avionics, Embedded Data Acquisition Systems.
Industrial Process Control
The MC68340CAB25E fits industrial process control because its CPU32 core delivers deterministic 32-bit CISC performance at 25 MHz with object-code compatibility with the legacy 68000/68010/68020 instruction set, allowing reuse of proven control firmware without recompilation. The two integrated 32-bit DMA channels offload high-throughput data moves (sensor acquisition, actuator pulse trains) from the CPU, and the dual 16-bit timers (T1/T2) handle encoder/PWM/precision-event timing typical of PID loops. The 144-CQFP ceramic package and -40C to +85C industrial temperature grade suit factory-floor cabinets. Compared to a modern Cortex-M3, the 68340 trades raw MHz for software legacy, but its deterministic DMA make it suitable for legacy PLCs and motor controllers that already run M68K assembly.
Recommended
Telecommunications Line Cards
Although the MC68340CAB25E lacks the QUICC RISC communications processor of the MC68360, its integrated serial communication port (SCP) and QSPI handle low-density telecom line-card traffic such as D-channel signaling, control-plane messaging, and configuration EEPROM access. The 25 MHz CPU32 core can sustain light-weight protocol stacks (X.25, LAPD, simple HDLC control). For higher channel densities, designers pair the MC68340 with an external HDLC controller. The CQFP-144 package suits through-hole backplane assemblies historically used in telecom shelves. This is a cost-down approach when the application does not require the full QUICC multi-channel SCC capability.
Recommended
Medical Instrumentation
The MC68340CAB25E serves medical instrumentation with its deterministic DMA, predictable interrupt latency, and the long-term reliability of the M68K instruction set used in FDA-cleared legacy devices. The CPU32 core's M68000 compatibility allows reuse of validated diagnostic code, while the dual timers and chip-select logic simplify interfacing to analog front ends, LCD/keypad controllers, and patient-monitoring peripherals. The ceramic CQFP-144 package offers hermeticity suitable for medical-imaging and patient-monitoring enclosures. Designers building new medical designs should weigh this part's obsolete/EOL status against modernization, but for installed-base support and field replacement, the 68340 is a known-quantity solution.
Recommended
Point-of-Sale Terminals
The MC68340CAB25E is well-suited to legacy point-of-sale (POS) terminals because its 32-bit CPU32 core, 8 programmable chip-select outputs, and DRAM controller let it interface directly to flash, SRAM, character LCD, keypad matrix, magnetic-stripe reader, and serial peripherals without external glue logic. The dual DMA channels can sustain printer bursts and cash-drawer pulse streams, and the QSPI/SCP handle secure PIN-pad or EFT-POS serial links. The 144-CQFP package fits the through-hole mainboards typical of legacy countertop terminals. Engineers maintaining installed POS fleets rely on the 68340's known firmware, but new POS designs should evaluate ARM Cortex-A or Cortex-M parts for cost and power reasons.
Recommended
Legacy Aerospace / Military Avionics
The MC68340CAB25E, especially the 'A' or 'M' temperature-grade variants, has been used in military/aerospace avionics where its object-code compatibility with the Motorola 68000 family, deterministic DMA, and hermetic CQFP-144 ceramic package meet ruggedization and obsolescence-management requirements. Its extended temperature range and proven reliability make it acceptable for line-replaceable units (LRUs) where re-engineering a flight-certified board is prohibitive. For new avionics, NXP and NXP community guidance advise modern ColdFire or ARM Cortex-R parts, but legacy LRUs continue to depend on 68K CPU32 stock. The 'E' industrial variant (this part) is the commercial-off-the-shelf (COTS) baseline; 'A' and 'M' grades extend temperature further.
Recommended
Embedded Data Acquisition Systems
The MC68340CAB25E handles embedded data-acquisition systems because the CPU32 core drives fast ADC/DAC sampling while the two 32-bit DMA channels transfer samples to memory without CPU overhead, achieving sustained throughput at 25 MHz. The dual 16-bit timers provide accurate sample-rate generation, and the eight programmable chip-select outputs simplify interfacing to SRAM, flash, FIFOs, and external ADC converters. The QSPI/SCP ports link to external sensors or front-panel controllers. Designers building new high-channel-count DAQ should consider modern ARM Cortex-M4 with DMA + 12-/16-bit ADC, but the 68340 remains a viable platform for maintaining installed seismic, vibration, or rotating-machinery monitoring systems.
Recommended
Recommended Products Summary
Engineering reference data for MC68340CAB25E — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68340CAB20E | MC68340CAB16E | MC68340AB25E |
|---|---|---|---|---|
| Brand | NXP Semiconductors (formerly Freescale) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | CQFP-144 (28x28 mm) | CQFP-144 (28x28 mm) - same | CQFP-144 (28x28 mm) - same | QFP-144 (plastic) - same pinout |
| Clock Speed | 25 MHz | 20 MHz (-20%) | 16 MHz (-36%) | 25 MHz (same) |
| Core | CPU32 (M68000) | CPU32 (M68000) | CPU32 (M68000) | CPU32 (M68000) |
| DMA Channels | 2 x 32-bit | 2 x 32-bit | 2 x 32-bit | 2 x 32-bit |
| Timers | 2 x 16-bit | 2 x 16-bit | 2 x 16-bit | 2 x 16-bit |
| Chip Selects | 8 (programmable) | 8 | 8 | 8 |
| Package Material | Ceramic (CQFP) | Ceramic | Ceramic | Plastic (QFP) |
| Lifecycle | Obsolete / EOL | Obsolete / EOL | Obsolete / EOL | Obsolete / EOL |
Key Differentiators
- Highest 25 MHz clock speed in the MC68340 family (vs MC68340CAB20E)
- Ceramic CQFP-144 hermetic package for rugged/military-grade applications (vs MC68340AB25E)
- Higher-density integration (CPU32 + DMA + 2 timers + 8 chip-selects + DRAM controller) than MC68302 (vs MC68302FC25C)
Design Notes
Do not assume a pin-to-pin drop-in upgrade path exists for the MC68340 family. Per NXP community (community.nxp.com), no direct drop-in replacement is offered; ColdFire MC68SECC608 and modern ARM Cortex-M parts require PCB redesign and firmware rework. For obsolete-part maintenance, qualify a second source through Rochester Electronics or franchised brokers with date-code traceability, and consider stockpiling to bridge obsolescence gaps. Estimated: bus timing and wait-state register defaults must be initialized during reset configuration or the system will hang at first DRAM access.
The 144-CQFP ceramic package is a surface-mount component with a gull-lead profile - it can also be socketed (e.g., through-hole PGA-style sockets) for prototyping and field replacement. Ensure the PCB land pattern uses 0.64 mm pitch with the ceramic-pad thermal-relief rules for reflow or wave soldering. The package is large (28 mm body), so place decoupling capacitors (100 nF + 10 uF bulk) within 5 mm of each Vcc/Vss pair. Per the Freescale/NXP datasheet, the multiplexed address/data bus requires external latch devices (e.g., 74HC573) when interfacing to 8/16-bit peripherals.
At 25 MHz with a multiplexed 32-bit bus, signal integrity demands controlled-impedance routing (typically 50 ohm microstrip) for the address/data bus and critical control signals (/AS, /DS, /CS, R/W). Estimated: edge rates of 2-3 ns at 25 MHz on the CQFP-144 leads (typical 5 pF pin capacitance + ~30 pF trace) call for series-damping resistors (22-33 ohm) on heavily-loaded lines. Bus termination at the memory side with parallel-diodes or 33 ohm series resistors is recommended for backplane or long-trace designs.
The MC68340CAB25E operates from a single 5 V supply (typical M68K CPU32 specification); supply tolerance and current draw are not in the verified web data. Estimated: based on similar CPU32 masks, supply current is approximately 150-250 mA at 25 MHz. Use a linear regulator (e.g., 7805 or low-dropout) for clean power, and bulk-decouple Vcc/Vss pairs with at least one 10 uF tantalum + one 100 nF ceramic per two Vcc pins. Keep the reset and HALT pins pulled high via 10 kOhm resistors and driven low only by supervisory circuitry.
Compliance Information
Compliance flags are not stated in the verified web data. The ceramic CQFP-144 package suggests non-RoHS (lead-bearing ceramic) for the original Freescale-era date code, but this is not authoritative. Customers requiring RoHS compliance should request a CoC from the distributor. AEC-Q100 not applicable (this is an industrial MPU, not an automotive-qualified part).
