MC68332GVAG25557 - 32-bit CPU32 MCU 25MHz LQFP-144 | NXP
MPN: MC68332GVAG25557 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
MC68332GVAG25557 Overview
A 32-bit microcontroller such as the MC68332 combines a processor core with memory, timers, and serial peripherals on one die, sitting at the top of the microcontroller hierarchy (semiconductor -> integrated circuit -> microcontroller -> 32-bit MCU). The MC68332 family is based on the CPU32 core, an instruction-set derivative of the classic MC68000 16/32-bit architecture, so existing 68000 assembly and C code can be recompiled with minimal changes.
Key features include the ROMless program-memory configuration, which requires external FLASH or EPROM connected via the 24-bit address bus and 16-bit external data bus; approximately 31 general-purpose I/O lines; the intelligent TPU coprocessor that offloads complex timing tasks such as PWM, input capture, and step-motor control from the CPU; and the QSM, which provides a queued SCI serial port plus a QSPI interface. The device is fabricated in HCMOS process technology for low power with TTL-compatible I/O.
Typical applications include industrial automation controllers, automotive ECU prototyping, motor-control and motion-timing systems leveraging the TPU, thermal sensor data loggers, and legacy test equipment. The external-memory architecture makes it especially suited to designs needing large code images or field-updatable firmware.
Design consideration: because the part is ROMless and clocks at 25 MHz, PCB layout must keep external memory traces short and matched, and the 5 V supply requires level-shifting when interfacing with modern 3.3 V peripherals.
This page synthesizes distributor sourcing data, drop-in same-family alternatives, and NXP community replacement guidance not consolidated in any single datasheet. Note: this suffix (,557) device is a Rochester Electronics-sourced legacy supply item for the discontinued Freescale MC68332 line; stock is allocated through authorized-legacy channels.
Drop-in alternatives for MC68332GVAG25557 — 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 MC68332GVAG25557 (same form factor and footprint) — differing in Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68332GVAG16
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68332GCAG25
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.1 / Unit
View Datasheet →MC68332BCAG25
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68332PVAG25
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MC68332GVAG25557 Maximum Ratings & Electrical Characteristics
| Core Architecture | CPU32 (M68000-compatible 32-bit core) |
| Core Width | 32-bit |
| Maximum Clock Frequency | 25 MHz |
| Program Memory Type | ROMless (external memory required) |
| Internal RAM | 2 KB static RAM |
| Supply Voltage | 4.5 V to 5.5 V (5 V nominal) |
| Address Bus Width | 24-bit |
| External Data Bus Width | 16-bit |
| General-Purpose I/O Lines | 31 |
| Timing Coprocessor | Time Processor Unit (TPU) |
| Serial Module | QSM (queued SCI + QSPI) |
| Process Technology | HCMOS |
| Package Type | 144-terminal LQFP (LFQFP), square, 20x20 mm, gull-wing |
| JESD-30 Package Code | S-PQFP-G144 |
| Mounting Type | Surface Mount |
| Terminal Form | Gull Wing |
MC68332GVAG25557 s-pqfp-g144 Pin Configuration Guide
Pin configuration for MC68332GVAG25557 (s-pqfp-g144 package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for MC68332GVAG25557.
Refer to the datasheet for full pin configuration.
Typical Applications
MC68332GVAG25557 is suitable for 6 applications: Industrial Automation Controllers, Motor Control and Motion Timing, Automotive ECU Legacy Maintenance, Sensor Data Acquisition and Logging, Legacy Test and Measurement Equipment, Networking and Communication Backplane Cards.
Industrial Automation Controllers
The MC68332GVAG25557 fits industrial PLC and machine-control boards where the CPU32 25 MHz core, 2 KB SRAM, and 31 general-purpose I/O lines drive relay banks, encoders, and operator panels. Its ROMless external-memory architecture lets engineers store large control programs in field-replaceable FLASH on the 24-bit/16-bit bus, enabling firmware updates without touching the MCU. Placed on a 5 V (4.5-5.5 V) industrial supply, the HCMOS I/O directly interfaces legacy 5 V TTL subsystems, avoiding level translation. The main trade-off is bus speed: keep external memory traces under 10 cm and add wait states for slower EPROM, since the 25 MHz clock tightens access timing versus 16 MHz family members.
Recommended
Motor Control and Motion Timing
The defining asset of the MC68332GVAG25557 in motion control is its Time Processor Unit (TPU) - a dedicated 16-channel timing coprocessor that autonomously generates PWM, performs input capture, and sequences stepper motors without CPU intervention. This offloads hard real-time tasks from the CPU32 core, so a 25 MHz main clock still sustains multi-axis coordination that would saturate a general-purpose timer on lesser MCUs of the era. Systems typically wire TPU channels to gate drivers and quadrature encoders, with the QSPI collecting analog feedback. Migration risk is high: modern replacement MCUs lack a true TPU equivalent, so timing code must be re-architected around PWM peripherals and software scheduling.
Recommended
Automotive ECU Legacy Maintenance
Many 1990s-era automotive ECUs and body controllers were built around the MC68332, and the GVAG 25 MHz ROMless variant served development and low-volume builds. The 5 V HCMOS I/O matches automotive sensor conditioning front-ends of that period, and the QSM's queued SCI links to diagnostic interfaces. For maintenance of such fleets, the Rochester Electronics-sourced MC68332GVAG25557 preserves form, fit, and function - same 144-LQFP footprint, same code compatibility - avoiding a costly board respin. Supply is allocation-limited, so order full predicted lifetime quantities now; NXP confirms no active pin-compatible successor exists in the current automotive portfolio.
Recommended
Sensor Data Acquisition and Logging
Engineers running thermal-sensor and process-data loggers on the MC68332 (as documented in NXP community replacement threads) rely on the Queued Serial Module: the QSPI scans external ADCs in hardware while the queued SCI streams records out, keeping CPU overhead minimal at 25 MHz. The ROMless architecture stores large buffering and logging code in external FLASH, and the 2 KB SRAM holds fast-working buffers. The 5 V rail simplifies interfacing with classic analog signal chains. Note that with only 2 KB internal RAM, long-term buffering must live in external SRAM on the 16-bit bus, so bus contention with program fetches should be budgeted when streaming continuously.
Recommended
Legacy Test and Measurement Equipment
Bench instruments, rack controllers, and ATE subsystems of the 1990s commonly used the MC68332 because the CPU32 core executes 68000-family code, the QSPI handles IEEE-488 bridge chips and precision ADCs, and the TPU generates stimulus timing. Service organizations repairing such equipment need the exact 25 MHz ROMless 144-LQFP device to keep instrument firmware and timing calibration intact - any clock derating to a 16 MHz variant would alter measurement timing. The MC68332GVAG25557 sourced via Rochester Electronics preserves cycle-exact behavior. Verify that replacement stock carries matching date-code tolerances for instruments where oscillator aging was calibrated against the original silicon.
Recommended
Networking and Communication Backplane Cards
The MC68332GVAG25557 suits legacy communication line cards and protocol converters: the 24-bit address bus addresses substantial external dual-port RAM or packet buffers, the 16-bit data bus sustains throughput, and the queued SCI provides serial uplinks. Chip-select and bus-control outputs of the CPU32 simplify glueless attachment of SRAM, FLASH, and UARTs at 25 MHz. In 5 V backplane environments, the HCMOS I/O connects directly to period-correct transceivers. For prolonged-life designs, however, board respins should migrate to active 3.3 V MCUs such as the ColdFire MCF5280 or Kinetis families, because this device's EOL status makes long-term single-source supply the dominant risk factor.
Recommended
Recommended Products Summary
Engineering reference data for MC68332GVAG25557 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MC68332GVAG16 | MC68332GCAG25 | MC68332BCAG25 | MCF5235CVM150J |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors (Freescale legacy) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Max Clock Frequency | 25 MHz | 16 MHz | 25 MHz | 25 MHz | 150 MHz |
| Program Memory | ROMless (external) | ROMless (external) | Factory masked ROM | Factory masked ROM | External + on-chip SRAM/FLASH options |
| Internal RAM | 2 KB SRAM | 2 KB SRAM | 2 KB SRAM | 2 KB SRAM | 64 KB SRAM |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 3.3 V |
| Timing Coprocessor (TPU) | Yes (16-channel) | Yes (16-channel) | Yes (16-channel) | Yes (16-channel) | No (eTPU on companion devices) |
| Lifecycle Status | EOL - Rochester legacy supply | EOL - Rochester legacy supply | EOL - Rochester legacy supply | EOL - Rochester legacy supply | Active (verify current status) |
Key Differentiators
- Fastest ROMless family member for field-updatable systems (vs MC68332GVAG16)
- Firmware flexibility vs masked-ROM siblings (vs MC68332GCAG25)
- True form-fit-function legacy continuity (vs MCF5235CVM150J)
Design Notes
The MC68332GVAG25557 requires a regulated 4.5 V to 5.5 V supply. Budget decoupling with at least one 0.1 uF ceramic per power pin pair plus a 10 uF bulk capacitor near the 144-LQFP. Because the ROMless architecture drives a 16-bit external bus at 25 MHz, switching current spikes scale with bus activity - measure worst-case rail droop with representative code executing from external FLASH, not idle loops. Never rely on a 3.3 V rail: the HCMOS I/O and core are 5 V-only, and undervoltage below 4.5 V voids the clock specification.
Keep the external memory bus (24 address, 16 data lines) short and length-matched; at 25 MHz, bus turnaround and chip-select access timing allow little margin for slow EPROM or heavily loaded FLASH. Terminate address lines above ~10 cm with series resistors (22-33 ohm) to control ringing. Place the crystal/PLL loop components close to the clock pins and guard them from bus switching noise, since PLL jitter directly affects TPU timing accuracy in motor-control applications.
Do not substitute the 16 MHz MC68332GVAG16 into a design calibrated for 25 MHz operation - SCI baud rates, TPU periods, and external-memory wait states all scale with the clock, and NXP community threads (Replacement for MC68332, 2022/2026) confirm no pin-compatible active successor exists, so plan end-of-life strategy now: either lifetime-buy Rochester stock or schedule a redesign to MCX A / ColdFire. Also remember the ,557 build is Rochester-sourced: verify date codes and require authorized-channel documentation to avoid counterfeit silicon.
Compliance Information
This is a legacy (originally 1990s-era Motorola/Freescale) device supplied via Rochester Electronics; RoHS/REACH status was not stated in the verified distributor data. Original-generation MC68332 builds predate lead-free mandates - confirm with Rochester Electronics whether the current legacy build is RoHS/lead-free compliant before use in restricted markets.
