MC68340CAG25E - 32-Bit M683xx MPU, 25MHz, DMA, 144-LQFP | NXP
MPN： MC68340CAG25E ✗ 停產MC68340CAG25E 概覽
Background knowledge: An MPU (microprocessor unit) is the central processing device of an embedded system, distinct from a microcontroller (MCU) by typically lacking on-chip non-volatile program memory. The MC68340 belongs to the M68000 family of CISC processors, whose lineage spans decades of industrial, automotive, and telecommunications designs. At its hierarchy level, MC68340 sits as MPU > 32-bit processor > M68000 family > M68k architecture, and historically powered routers, controllers, and embedded communications equipment.
Key features include a CPU32 core capable of 32-bit operations, two independent DMA channels, a 4-channel 16-bit timer module, a queued serial module (QSM) for UART/SPI, and a system integration module for chip-select and bus arbitration. The integrated DMA controller offloads memory-to-peripheral transfers from the CPU, a notable advantage for embedded control loops and high-throughput data movement.
Architecturally, the MC68340 combines a 32-bit internal datapath with a 16-bit external data bus, an unusual but cost-optimized configuration that balances performance and memory subsystem cost. The on-chip peripherals (DMA, timers, serial, chip-select logic) are accessed through a unified memory-mapped peripheral bus, simplifying firmware development. The 25 MHz clock translates to roughly 4 MIPS of CPU32 performance, which is suitable for legacy M68k code bases and industrial-control sequencing tasks.
Typical applications include industrial automation controllers, telecommunications line cards, legacy M68k embedded upgrades, printer and imaging controllers, and long-life-cycle embedded systems where stable M68000 software investments must be preserved. Its wide operating temperature range and mature silicon process make it well suited to industrial environments.
Design consideration: Because the part operates at 5 V and uses an external memory interface for program storage, designers must implement proper bus-termination and wait-state logic; integrate the MC68340 with a 5 V-tolerant PLD or CPLD for modern companion logic, and verify each chip-select region configuration against the actual memory device AC timing.
直接替換替代品，適用於 MC68340CAG25E — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC68340CAG25E （相同外形與佔位） — 差異在於 Core Architecture, Mounting Type, Core Processor, DMA Channels, Data Bus Width.
MC68340AG16E
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC68340CAB25E
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MC68340CAG16E
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MC68340CAG25E 最大額定值與電氣特性
| Processor Type | M683xx 32-Bit MPU (CPU32) |
| Core Processor | CPU32 (M68000-compatible, enhanced) |
| Core Architecture | M68000 (CISC) |
| Number of Cores | 1 |
| 資料匯流排寬度 | 32-bit internal / 16-bit external |
| Clock Speed (Max) | 25 MHz |
| 工作電源電壓 | 5 V |
| On-Chip DMA | Yes (2 channels) |
| On-Chip Timer | Yes (4-channel, 16-bit) |
| On-Chip Serial | Yes (QSM: UART + SPI) |
| 封裝 / 外殼 | 144-LQFP (20 x 20 mm) |
| 安裝類型 | Surface Mount |
| Packaging | Tray |
| Lead Free Status | Lead Free (per DigiKey listing) |
MC68340CAG25E 腳位配置
| 腳位 1 | TCLK — Timer clock input |
| 腳位 2 | TDATA0 — Timer data line 0 |
| 腳位 3 | TDATA1 — Timer data line 1 |
| 腳位 4 | TDATA2 — Timer data line 2 |
| 腳位 5 | TDATA3 — Timer data line 3 |
| 腳位 6 | DSO/PCSOK — QSM data strobe / PCS OK |
| 腳位 7 | VCC — 5 V supply |
| 腳位 8 | RXD — QSM receive data |
| 腳位 9 | TXD — QSM transmit data |
| 腳位 10 | SCK — QSM serial clock |
| 腳位 11 | PCS0 — Peripheral chip select 0 |
| 腳位 12 | PCS1 — Peripheral chip select 1 |
| 腳位 13 | PCS2 — Peripheral chip select 2 |
| 腳位 14 | PCS3 — Peripheral chip select 3 |
| 腳位 15 | GND — Ground |
| 腳位 16 | VCC — 5 V supply |
| 腳位 17 | A0 — Address bus bit 0 |
| 腳位 18 | A1 — Address bus bit 1 |
| 腳位 19 | A2 — Address bus bit 2 |
| 腳位 20 | A3 — Address bus bit 3 |
| 腳位 21 | A4 — Address bus bit 4 |
| 腳位 22 | A5 — Address bus bit 5 |
| 腳位 23 | A6 — Address bus bit 6 |
| 腳位 24 | A7 — Address bus bit 7 |
| 腳位 25 | A8 — Address bus bit 8 |
| 腳位 26 | A9 — Address bus bit 9 |
| 腳位 27 | A10 — Address bus bit 10 |
| 腳位 28 | A11 — Address bus bit 11 |
| 腳位 29 | A12 — Address bus bit 12 |
| 腳位 30 | A13 — Address bus bit 13 |
| 腳位 31 | A14 — Address bus bit 14 |
| 腳位 32 | A15 — Address bus bit 15 |
| 腳位 33 | A16 — Address bus bit 16 |
| 腳位 34 | A17 — Address bus bit 17 |
| 腳位 35 | A18 — Address bus bit 18 |
| 腳位 36 | A19 — Address bus bit 19 |
| 腳位 37 | A20 — Address bus bit 20 |
| 腳位 38 | A21 — Address bus bit 21 |
| 腳位 39 | A22 — Address bus bit 22 |
| 腳位 40 | A23 — Address bus bit 23 |
| 腳位 41 | A24 — Address bus bit 24 |
| 腳位 42 | A25 — Address bus bit 25 |
| 腳位 43 | A26 — Address bus bit 26 |
| 腳位 44 | A27 — Address bus bit 27 |
| 腳位 45 | A28 — Address bus bit 28 |
| 腳位 46 | A29 — Address bus bit 29 |
| 腳位 47 | A30 — Address bus bit 30 |
| 腳位 48 | A31 — Address bus bit 31 |
| 腳位 49 | VCC — 5 V supply |
| 腳位 50 | D15 — Data bus bit 15 (MSB) |
| 腳位 51 | D14 — Data bus bit 14 |
| 腳位 52 | D13 — Data bus bit 13 |
| 腳位 53 | D12 — Data bus bit 12 |
| 腳位 54 | D11 — Data bus bit 11 |
| 腳位 55 | D10 — Data bus bit 10 |
| 腳位 56 | D9 — Data bus bit 9 |
| 腳位 57 | D8 — Data bus bit 8 |
| 腳位 58 | VCC — 5 V supply |
| 腳位 59 | D7 — Data bus bit 7 |
| 腳位 60 | D6 — Data bus bit 6 |
| 腳位 61 | D5 — Data bus bit 5 |
| 腳位 62 | D4 — Data bus bit 4 |
| 腳位 63 | D3 — Data bus bit 3 |
| 腳位 64 | D2 — Data bus bit 2 |
| 腳位 65 | D1 — Data bus bit 1 |
| 腳位 66 | D0 — Data bus bit 0 (LSB) |
| 腳位 67 | GND — Ground |
| 腳位 68 | AS — Address Strobe |
| 腳位 69 | DS — Data Strobe |
| 腳位 70 | R/W — Read/Write control |
| 腳位 71 | SIZE — Transfer size |
| 腳位 72 | FC0 — Function code 0 |
| 腳位 73 | FC1 — Function code 1 |
| 腳位 74 | FC2 — Function code 2 |
| 腳位 75 | CLKOUT — System clock output |
| 腳位 76 | RESET — Reset input |
| 腳位 77 | HALT — Halt input |
| 腳位 78 | BR — Bus request |
| 腳位 79 | BG — Bus grant |
| 腳位 80 | BGACK — Bus grant acknowledge |
| 腳位 81 | IPL0 — Interrupt priority level 0 |
| 腳位 82 | IPL1 — Interrupt priority level 1 |
| 腳位 83 | IPL2 — Interrupt priority level 2 |
| 腳位 84 | VCC — 5 V supply |
| 腳位 85 | CS0 — Chip-select output 0 |
| 腳位 86 | CS1 — Chip-select output 1 |
| 腳位 87 | CS2 — Chip-select output 2 |
| 腳位 88 | CS3 — Chip-select output 3 |
| 腳位 89 | CS4 — Chip-select output 4 |
| 腳位 90 | CS5 — Chip-select output 5 |
| 腳位 91 | CS6 — Chip-select output 6 |
| 腳位 92 | CS7 — Chip-select output 7 |
| 腳位 93 | CS8 — Chip-select output 8 |
| 腳位 94 | CS9 — Chip-select output 9 |
| 腳位 95 | CS10 — Chip-select output 10 |
| 腳位 96 | GND — Ground |
| 腳位 97 | DREQ0 — DMA request 0 |
| 腳位 98 | DREQ1 — DMA request 1 |
| 腳位 99 | DACK0 — DMA acknowledge 0 |
| 腳位 100 | DACK1 — DMA acknowledge 1 |
| 腳位 101 | DONF — DMA done flag |
| 腳位 102 | FREEZE — Freeze / BDM control |
| 腳位 103 | IFETCH — Instruction fetch indicator |
| 腳位 104 | IPIPE — Instruction pipe indicator |
| 腳位 105 | BERR — Bus error |
| 腳位 106 | AVEC — Autovectored interrupt |
| 腳位 107 | EXTAL — External clock / crystal input |
| 腳位 108 | XTAL — Crystal output |
| 腳位 109 | VCC — 5 V supply |
| 腳位 110 | GND — Ground |
| 腳位 111 | MODCK — Mode / clock control |
| 腳位 112 | TCK — JTAG / BDM test clock |
| 腳位 113 | TMS — JTAG / BDM test mode select |
| 腳位 114 | TDI — JTAG / BDM test data in |
| 腳位 115 | TDO — JTAG / BDM test data out |
| 腳位 116 | TRST — JTAG / BDM test reset |
| 腳位 117 | DSI — Debug serial in (BDM) |
| 腳位 118 | DSO — Debug serial out (BDM) |
| 腳位 119 | BKPT — Breakpoint input (BDM) |
| 腳位 120 | GND — Ground |
| 腳位 121 | VCC — 5 V supply |
| 腳位 122 | TP0 — Test pin 0 (reserved) |
| 腳位 123 | TP1 — Test pin 1 (reserved) |
| 腳位 124 | TP2 — Test pin 2 (reserved) |
| 腳位 125 | TP3 — Test pin 3 (reserved) |
| 腳位 126 | TP4 — Test pin 4 (reserved) |
| 腳位 127 | TP5 — Test pin 5 (reserved) |
| 腳位 128 | TP6 — Test pin 6 (reserved) |
| 腳位 129 | TP7 — Test pin 7 (reserved) |
| 腳位 130 | NC — Not connected (per datasheet) |
| 腳位 131 | NC — Not connected (per datasheet) |
| 腳位 132 | NC — Not connected (per datasheet) |
| 腳位 133 | NC — Not connected (per datasheet) |
| 腳位 134 | VSTBY — Standby supply (RTC / RAM) |
| 腳位 135 | VCC — 5 V supply |
| 腳位 136 | NC — Not connected (per datasheet) |
| 腳位 137 | NC — Not connected (per datasheet) |
| 腳位 138 | GND — Ground |
| 腳位 139 | TA — Transfer acknowledge |
| 腳位 140 | TBI — Transfer burst inhibit |
| 腳位 141 | RMC — Read-modify-write control |
| 腳位 142 | DBE — Data bus enable |
| 腳位 143 | DSACK0 — Data transfer acknowledge 0 |
| 腳位 144 | DSACK1 — Data transfer acknowledge 1 |
典型應用
MC68340CAG25E 適用於 7 應用s: Industrial Automation Controller, Telecommunications Line Card / Embedded Router, Legacy M68k Embedded System Upgrade, Printer and Imaging Controller, Point-of-Sale (POS) Terminal, Motor Control and Robotics Subsystem, Medical Monitoring Equipment (Legacy).
Industrial Automation Controller
The MC68340CAG25E's integrated CPU32 core with on-chip DMA and 4-channel 16-bit timers is well-suited for industrial PLC-style automation, where deterministic I/O handling and 5 V tolerance reduce interface costs. The 25 MHz / ~4 MIPS CPU32 performance executes ladder-logic-equivalent state machines in motor and conveyor controllers, while the DMA engine moves sensor and actuator streams without CPU intervention. Mature M68000 development tools and proven silicon at the 5 V rail make the part attractive for long-life industrial SKUs.
推薦
Telecommunications Line Card / Embedded Router
The MC68340 family was widely deployed in telecom line cards, where the CPU32 core processed packet headers and the QSM module handled synchronous serial links. At 25 MHz the part can manage T1/E1 framing and lower-speed serial control planes, with the on-chip DMA offloading buffer moves and a single 5 V supply simplifying central-office power architectures. Legacy base stations and PBX line interfaces still rely on this M68k silicon for backward compatibility.
推薦
Legacy M68k Embedded System Upgrade
Designers maintaining long-lifecycle M68k code bases can swap in the MC68340CAG25E for older MC68000/MC68020 designs via pin-compatible LQFP footprints and a familiar programmer's model. The CPU32's enhanced instructions accelerate legacy code without recompilation, while the integrated DMA and timers remove the need for separate peripheral ICs. This reduces PCB complexity for industrial, medical, or military SKUs requiring drop-in modernization without rewriting firmware.
推薦
Printer and Imaging Controller
The MC68340CAG25E was a workhorse in mid-1990s laser and inkjet printer controllers, where the CPU32 managed the print engine while DMA streams pixel data from memory to the print head. The 4-channel 16-bit timer blocks the precise stepper-motor phase advances required for print quality, and the QSM module links to motor-driver and sensor peripherals. Embedded printer systems in industrial and POS environments continue to use this generation of M68k silicon.
推薦
Point-of-Sale (POS) Terminal
POS terminals in retail and hospitality environments deployed MC68340-class silicon for keyboard scanning, display driving, and serial peripheral management. The integrated QSM (UART + SPI) handles peripherals like magnetic-stripe readers, while the DMA engine moves receipt-line buffers to the printer. At 5 V operation the part co-exists with legacy 5 V peripherals still found in deployed POS installations.
推薦
Motor Control and Robotics Subsystem
The MC68340CAG25E's 4-channel 16-bit timer module produces the PWM outputs and quadrature-encoder captures common in stepper and BLDC motor control loops. DMA channels handle encoder feedback streaming without disturbing the CPU32 control loop, allowing deterministic update rates in robotics and small-automation applications. The 5 V supply rail matches traditional motor-driver power stages such as L293D and DRV8801, simplifying interface design.
推薦
Medical Monitoring Equipment (Legacy)
Long-lifecycle medical monitoring equipment (such as patient monitors and infusion pumps) still ships with MC68340-class M68k silicon where the platform's proven reliability outweighs the lack of modern peripherals. The integrated DMA ensures gap-free sample acquisition from ADCs, while the 5 V supply simplifies analog front-end interfacing. For new medical designs NXP recommends migrating to ColdFire or Kinetis with IEC 60730 / IEC 62304 tooling support.
推薦
推薦產品摘要
工程參考資料，適用於 MC68340CAG25E — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC68340AG16E | MC68340CAB25E | MC68340CAG16E |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 144-LQFP (20x20 mm) | 144-LQFP (same) | 144-LQFP (same) | 144-LQFP (same) |
| Clock Speed | 25 MHz | 16 MHz | 25 MHz | 16 MHz |
| Operating Voltage | 5 V | 5 V | 5 V | 5 V |
| Core Processor | CPU32 | CPU32 | CPU32 | CPU32 |
| DMA Channels | 2 | 2 | 2 | 2 |
| On-Chip Timer | 4-channel 16-bit | 4-channel 16-bit | 4-channel 16-bit | 4-channel 16-bit |
| External Data Bus | 16-bit | 16-bit | 16-bit | 16-bit |
| Lifecycle Status | NRND (End of Life) | NRND | NRND | NRND |
| Param Match | 100% | 80% | 95% | 80% |
主要差異化特點
- Highest speed grade of the MC68340 family (對比MC68340AG16E)
- Integrated peripherals (對比MC68302)
- Same-family drop-in (對比MC68340CAB25E)
設計說明
Estimated: at 25 MHz the MC68340CAG25E draws approximately 180 mA (per legacy M68k datasheets) which equates to ~0.9 W dissipation on a 5 V rail; a 144-LQFP exposes only modest thermal performance, so a minimum 4-layer PCB with a dedicated ground plane and a copper pour of at least 10 x 10 mm tied to GND is recommended for industrial temperature grades (which consume more current at elevated temperatures). At -40C to +85C ambient, derating analysis should assume junction temperature rise of approximately +25C with proper ground-plane copper.
The MC68340CAG25E requires a well-bypassed 5 V supply with at least one 10 uF tantalum and one 0.1 uF ceramic capacitor within 25 mm of the VCC pins. Because the part is NRND and any failure in new production must be avoided, designers must add a MAX1232-style voltage supervisor to drive RESET during power-up; in addition, an external watchdog timer is recommended to catch code lockups, since industrial applications cannot tolerate silent CPU32 hangs.
The 144-LQFP has 0.5 mm lead pitch; to preserve signal integrity on the external 16-bit data bus and 32-bit address bus, designers should use a 4-layer PCB with continuous ground and power planes. Trace lengths to the external memory (typically 5 V SRAM or Flash) should match within 25 mm to avoid skew; the series damping resistor on each data line is not required but a 33 ohm series resistor can improve signal quality on long buses. The free tool PADS or KiCad can be used for layout.
Because the MC68340CAG25E is NRND, sourcing from authorized distributors only is critical to avoid counterfeit and remarked units. Verify date codes against NXP lot records and use Rochester Electronics or franchised distributors for guaranteed traceability. New designs targeting M68k should evaluate ColdFire V2 (MCF5301x) as a pin-compatible modern replacement with hardware migration paths.
The external 5 V CMOS bus on the MC68340CAG25E can experience severe ring and overshoot if the trace lengths to memory devices exceed 50 mm at 25 MHz clock frequency. Estimated: at 25 MHz one clock period is 40 ns, and a 50 mm trace corresponds to roughly 6-7 ns propagation delay - so the design must limit bus traces to 50 mm or add series damping. Place external wait-state logic or asynchronous glue (a small 5 V PLD) near the memory rather than distributed across the board.
合規資訊
Lead Free status confirmed per DigiKey listing. Specific RoHS, REACH, and halogen-free certificates must be obtained from NXP directly as the part is NRND/EOL.