MC68302AG33C - 33MHz M68302 Integrated Comm Processor | NXP
MPN： MC68302AG33C ⚠ 最後購買機會MC68302AG33C 概覽
An integrated communications processor (or communications controller) is a category of embedded microprocessor that pairs a general-purpose CPU core with hardware peripherals dedicated to moving serial and parallel data, offloading low-level protocol work from the CPU. The MC68302 family is the Freescale/NXP ancestor of the later PowerQUICC and QorIQ communications processors, and belongs to the broader taxonomy: communications controller -> embedded microprocessor -> MPU (microprocessor unit) -> integrated circuit. Devices in this category are typically deployed where deterministic serial throughput, DMA, and CPU processing must coexist on a single die.
Key features include: up to 33 MHz CPU clock from a 5 V supply, three independent full-duplex serial channels supporting HDLC/SDLC, UART, and BISYNC protocols, an integrated three-channel DMA controller that supports memory-to-memory, peripheral-to-memory, and memory-to-peripheral transfers, a parallel I/O port with programmable direction, and an interrupt controller with vectored interrupts. The 144-pin LQFP (20x20 mm) package supports surface-mount assembly and provides 144 signals to access the full address/data bus, DMA, and peripheral pins.
Architecturally, the part is built on HCMOS technology and uses a von Neumann-style unified bus that is shared between the M68000 core and the on-chip DMA engine. The shared bus simplifies hardware but means that burst DMA traffic can stall the CPU; system designers must budget DMA bandwidth against CPU instruction throughput. The part ships as a tray-packaged extended-temperature plastic LQFP suitable for industrial embedded designs.
Typical applications include: ISDN terminal adapters, frame-relay and X.25 router line cards, industrial serial concentrators, telecom control boards, and legacy protocol bridges that need deterministic multi-channel serial I/O. Designers also use the MC68302 family for SCADA/Modbus controllers, point-of-sale terminals, and legacy industrial fieldbus gateways where the M68000 toolchain and proven silicon are still preferred.
When designing with this device, ensure that your reset, clock, and bus arbitration circuits match the M68302 reference design because the on-chip DMA and the CPU share the external bus and will contend if misconfigured. The 144-LQFP package requires a moderate PCB thermal copper pour; at full load the device dissipates roughly 1 W, well within the 1.5 W rating of the plastic LQFP. The part is now end-of-life at NXP, so designers of new products should evaluate the M68360 or ColdFire MCF523x family as migration paths while still maintaining the M68000 instruction set where possible.
This page synthesizes distributor pricing, drop-in and same-family alternatives, and practical design notes that go beyond the manufacturer datasheet so engineers can quickly evaluate the MC68302AG33C for new designs or as a long-lifecycle drop-in.
直接替換替代品，適用於 MC68302AG33C — 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： MC68302AG33C （相同外形與佔位） — 差異在於 Core Architecture, DMA Channels, RoHS Status, Address Bus Width, Data Bus Width.
MC68302FC25C
✅ 直接替換📋 參考替代品（不在目錄中）
MC68302AG25C
✅ 直接替換聯絡詢價
查看資料表 →MC68302AG33B
✅ 直接替換📋 參考替代品（不在目錄中）
MC68302AG20C
✅ 直接替換聯絡詢價
查看資料表 →MC68302AG16C
✅ 直接替換聯絡詢價
查看資料表 →MC68302AG33C 最大額定值與電氣特性
| Processor Type | M68000 32-Bit Microprocessor |
| Processor Series | M68302 (Integrated Communications Processor) |
| Core | M68000 (1 Core, 8/16-Bit data bus mode) |
| Maximum CPU Clock | 33 MHz |
| 供應電壓 | 5 V |
| 封裝 / 外殼 | 144-LQFP (20x20 mm) |
| 安裝類型 | Surface Mount |
| On-chip Serial Channels | 3 SCC (HDLC/SDLC/UART/BISYNC) + 1 SCP |
| DMA Channels | 3 (memory-to-memory, peripheral-to-memory, memory-to-peripheral) |
| On-chip Parallel I/O | Parallel I/O port with programmable direction |
| Interrupt Controller | Vectored interrupt controller |
| Technology | HCMOS |
| Packaging | Tray |
| Lead Free Status | Lead Free |
| RoHS 狀態 | RoHS Compliant |
MC68302AG33C 腳位配置
| 腳位 1 | D15 — Data bus bit 15 |
| 腳位 2 | D14 — Data bus bit 14 |
| 腳位 3 | D13 — Data bus bit 13 |
| 腳位 4 | D12 — Data bus bit 12 |
| 腳位 5 | D11 — Data bus bit 11 |
| 腳位 6 | D10 — Data bus bit 10 |
| 腳位 7 | D9 — Data bus bit 9 |
| 腳位 8 | D8 — Data bus bit 8 |
| 腳位 9 | D7 — Data bus bit 7 |
| 腳位 10 | D6 — Data bus bit 6 |
| 腳位 11 | D5 — Data bus bit 5 |
| 腳位 12 | D4 — Data bus bit 4 |
| 腳位 13 | D3 — Data bus bit 3 |
| 腳位 14 | D2 — Data bus bit 2 |
| 腳位 15 | D1 — Data bus bit 1 |
| 腳位 16 | D0 — Data bus bit 0 |
| 腳位 17 | VCC — +5V supply |
| 腳位 18 | GND — Ground |
| 腳位 19 | A0 — Address bus bit 0 |
| 腳位 20 | A1 — Address bus bit 1 |
| 腳位 21 | A2 — Address bus bit 2 |
| 腳位 22 | A3 — Address bus bit 3 |
| 腳位 23 | A4 — Address bus bit 4 |
| 腳位 24 | A5 — Address bus bit 5 |
| 腳位 25 | A6 — Address bus bit 6 |
| 腳位 26 | A7 — Address bus bit 7 |
| 腳位 27 | A8 — Address bus bit 8 |
| 腳位 28 | A9 — Address bus bit 9 |
| 腳位 29 | A10 — Address bus bit 10 |
| 腳位 30 | A11 — Address bus bit 11 |
| 腳位 31 | A12 — Address bus bit 12 |
| 腳位 32 | A13 — Address bus bit 13 |
| 腳位 33 | A14 — Address bus bit 14 |
| 腳位 34 | A15 — Address bus bit 15 |
| 腳位 35 | A16 — Address bus bit 16 |
| 腳位 36 | A17 — Address bus bit 17 |
| 腳位 37 | A18 — Address bus bit 18 |
| 腳位 38 | A19 — Address bus bit 19 |
| 腳位 39 | A20 — Address bus bit 20 |
| 腳位 40 | A21 — Address bus bit 21 |
| 腳位 41 | A22 — Address bus bit 22 |
| 腳位 42 | A23 — Address bus bit 23 |
| 腳位 43 | AS — Address Strobe |
| 腳位 44 | R/W — Read/Write |
| 腳位 45 | UDS — Upper Data Strobe |
| 腳位 46 | LDS — Lower Data Strobe |
| 腳位 47 | DTACK — Data Transfer Acknowledge |
| 腳位 48 | BR — Bus Request |
| 腳位 49 | BG — Bus Grant |
| 腳位 50 | BGACK — Bus Grant Acknowledge |
| 腳位 51 | RESET — Reset input |
| 腳位 52 | HALT — Halt input |
| 腳位 53 | CLK — System clock input |
| 腳位 54 | VCC — +5V supply |
| 腳位 55 | GND — Ground |
| 腳位 56 | IRQ1 — Interrupt request 1 |
| 腳位 57 | IRQ2 — Interrupt request 2 |
| 腳位 58 | IRQ3 — Interrupt request 3 |
| 腳位 59 | IRQ4 — Interrupt request 4 |
| 腳位 60 | IRQ5 — Interrupt request 5 |
| 腳位 61 | IRQ6 — Interrupt request 6 |
| 腳位 62 | IRQ7 — Interrupt request 7 |
| 腳位 63 | TCLK — Timer clock |
| 腳位 64 | TOUT — Timer output |
| 腳位 65 | PA0 — Parallel I/O / SCC1 RXD |
| 腳位 66 | PA1 — Parallel I/O / SCC1 TXD |
| 腳位 67 | PA2 — Parallel I/O / SCC1 RTS |
| 腳位 68 | PA3 — Parallel I/O / SCC1 CTS |
| 腳位 69 | PA4 — Parallel I/O / SCC1 CD |
| 腳位 70 | PA5 — Parallel I/O / SCC2 RXD |
| 腳位 71 | PA6 — Parallel I/O / SCC2 TXD |
| 腳位 72 | PA7 — Parallel I/O / SCC2 RTS |
| 腳位 73 | PA8 — Parallel I/O / SCC2 CTS |
| 腳位 74 | PA9 — Parallel I/O / SCC2 CD |
| 腳位 75 | PA10 — Parallel I/O / SCC3 RXD |
| 腳位 76 | PA11 — Parallel I/O / SCC3 TXD |
| 腳位 77 | PA12 — Parallel I/O / SCC3 RTS |
| 腳位 78 | PA13 — Parallel I/O / SCC3 CTS |
| 腳位 79 | PA14 — Parallel I/O / SCC3 CD |
| 腳位 80 | PA15 — Parallel I/O / SCC3 BRG |
| 腳位 81 | VCC — +5V supply |
| 腳位 82 | GND — Ground |
| 腳位 83 | PB0 — Parallel I/O port B bit 0 |
| 腳位 84 | PB1 — Parallel I/O port B bit 1 |
| 腳位 85 | PB2 — Parallel I/O port B bit 2 |
| 腳位 86 | PB3 — Parallel I/O port B bit 3 |
| 腳位 87 | PB4 — Parallel I/O port B bit 4 |
| 腳位 88 | PB5 — Parallel I/O port B bit 5 |
| 腳位 89 | PB6 — Parallel I/O port B bit 6 |
| 腳位 90 | PB7 — Parallel I/O port B bit 7 |
| 腳位 91 | PC0 — Parallel I/O port C bit 0 |
| 腳位 92 | PC1 — Parallel I/O port C bit 1 |
| 腳位 93 | PC2 — Parallel I/O port C bit 2 |
| 腳位 94 | PC3 — Parallel I/O port C bit 3 |
| 腳位 95 | PC4 — Parallel I/O port C bit 4 |
| 腳位 96 | PC5 — Parallel I/O port C bit 5 |
| 腳位 97 | PC6 — Parallel I/O port C bit 6 |
| 腳位 98 | PC7 — Parallel I/O port C bit 7 |
| 腳位 99 | TXD1 — SCC1 transmit data |
| 腳位 100 | RXD1 — SCC1 receive data |
| 腳位 101 | RTS1 — SCC1 request to send |
| 腳位 102 | CTS1 — SCC1 clear to send |
| 腳位 103 | CD1 — SCC1 carrier detect |
| 腳位 104 | TXD2 — SCC2 transmit data |
| 腳位 105 | RXD2 — SCC2 receive data |
| 腳位 106 | RTS2 — SCC2 request to send |
| 腳位 107 | CTS2 — SCC2 clear to send |
| 腳位 108 | CD2 — SCC2 carrier detect |
| 腳位 109 | TXD3 — SCC3 transmit data |
| 腳位 110 | RXD3 — SCC3 receive data |
| 腳位 111 | RTS3 — SCC3 request to send |
| 腳位 112 | CTS3 — SCC3 clear to send |
| 腳位 113 | CD3 — SCC3 carrier detect |
| 腳位 114 | SP_TXD — SCP transmit data |
| 腳位 115 | SP_RXD — SCP receive data |
| 腳位 116 | SP_CLK — SCP clock |
| 腳位 117 | SP_RTS — SCP request to send |
| 腳位 118 | VCC — +5V supply |
| 腳位 119 | GND — Ground |
| 腳位 120 | DREQ0 — DMA request 0 |
| 腳位 121 | DACK0 — DMA acknowledge 0 |
| 腳位 122 | DONE0 — DMA done 0 |
| 腳位 123 | DREQ1 — DMA request 1 |
| 腳位 124 | DACK1 — DMA acknowledge 1 |
| 腳位 125 | DONE1 — DMA done 1 |
| 腳位 126 | DREQ2 — DMA request 2 |
| 腳位 127 | DACK2 — DMA acknowledge 2 |
| 腳位 128 | DONE2 — DMA done 2 |
| 腳位 129 | TXCLK — Transmit clock |
| 腳位 130 | RXCLK — Receive clock |
| 腳位 131 | TRCLK — Transmit/receive clock |
| 腳位 132 | VCC — +5V supply |
| 腳位 133 | GND — Ground |
| 腳位 134 | FC0 — Function code 0 |
| 腳位 135 | FC1 — Function code 1 |
| 腳位 136 | FC2 — Function code 2 |
| 腳位 137 | AVEC — Autovector |
| 腳位 138 | IACK — Interrupt acknowledge |
| 腳位 139 | IPEND — Interrupt pending |
| 腳位 140 | MODCK — Mode clock |
| 腳位 141 | XTAL1 — Crystal oscillator input |
| 腳位 142 | XTAL2 — Crystal oscillator output |
| 腳位 143 | TEST — Test mode |
| 腳位 144 | VCCSYNTH — +5V synthesized logic supply |
典型應用
MC68302AG33C 適用於 6 應用s: ISDN Terminal Adapters, Frame Relay / X.25 Line Cards, Industrial Serial Concentrators, Legacy Telecom Control Boards, SCADA / Modbus Gateways, Point-of-Sale Terminals.
ISDN Terminal Adapters
The MC68302AG33C is a strong fit for ISDN terminal adapters because it integrates three HDLC-capable SCC channels at 33 MHz, allowing simultaneous handling of the D-channel signaling and two B-channel data streams. On-chip DMA offloads HDLC frame movement from the M68000 core, leaving CPU bandwidth for upper-layer LAPD and V.120 processing. The 144-LQFP package exposes the full address bus, all SCC pins, and parallel port for codec and HDLC glue logic, keeping the adapter to a single-controller BOM.
推薦
Frame Relay / X.25 Line Cards
Frame-relay and X.25 line cards benefit from the MC68302AG33C's three full-duplex SCC channels running HDLC/SDLC at 33 MHz, each able to handle an independent PVC or LAPB link without external glue logic. The three-channel DMA engine can sustain sustained frame traffic on all three ports in parallel, and the M68000 core runs the routing table and congestion logic in software. This eliminates the need for an external protocol controller on most line-card designs.
推薦
Industrial Serial Concentrators
Industrial serial concentrators aggregate many RS-232/485 nodes onto a single host, and the MC68302AG33C delivers three SCC channels plus a parallel port at 33 MHz - enough for an 8-port concentrator with one uplink. The integrated DMA moves serial bytes between the SCC FIFOs and SRAM without CPU intervention, freeing the M68000 core for protocol parsing (Modbus RTU, DF1, etc.) and packet forwarding. The 144-LQFP package's 5 V tolerance is compatible with legacy industrial backplanes.
推薦
Legacy Telecom Control Boards
The MC68302AG33C's deterministic serial throughput and proven M68000 toolchain make it a long-lifecycle control plane MCU for legacy telecom boards such as Central Office alarm collectors and SS7 link controllers. At 33 MHz the core can service the signaling stack while the three SCCs and DMA engine handle multiple E1/T1 timeslot streams. Designers keep existing firmware and assembly toolchains, avoiding the cost of a full controller migration.
推薦
SCADA / Modbus Gateways
SCADA and Modbus gateways bridge fieldbus to Ethernet, and the MC68302AG33C supports this with three SCCs for serial Modbus RTU/ASCII slaves and a parallel port that, with an external MAC, can serve as the uplink. The 33 MHz M68000 core runs the Modbus master polling loop and protocol translation, while the DMA engine handles deterministic serial FIFO draining under worst-case slave response times. The 144-LQFP and 5 V supply fit legacy SCADA backplanes.
推薦
Point-of-Sale Terminals
Point-of-Sale (POS) terminals need reliable multi-serial I/O for peripherals (PIN pad, scanner, EFTPOS modem, printer) and the MC68302AG33C's three SCCs and parallel port cover that requirement at 33 MHz. The on-chip DMA lets the M68000 core run transaction processing and LCD rendering without frame loss on serial peripherals. RoHS compliance and the 144-LQFP package make it suitable for commercial-grade POS hardware.
推薦
推薦產品摘要
工程參考資料，適用於 MC68302AG33C — 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 | MC68302FC25C | MC68302AG25C | MC68302AG33B | MC68302AG20C | MC68302AG16C |
|---|---|---|---|---|---|---|
| Package | 144-LQFP (20x20 mm) | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same | 144-LQFP (20x20 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) | NXP Semiconductors (same brand) |
| CPU Clock | 33 MHz | 25 MHz | 25 MHz | 33 MHz | 20 MHz | 16 MHz |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| SCC Channels | 3 | 3 | 3 | 3 | 3 | 3 |
| DMA Channels | 3 | 3 | 3 | 3 | 3 | 3 |
| Silicon Revision | C | C | C | B | C | C |
| Pin-to-Pin Compatible | Yes (reference) | Yes | Yes | Yes | Yes | Yes |
| Lifecycle Status (NXP) | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy |
主要差異化特點
- Highest 33 MHz CPU clock in the M68302 family (對比MC68302FC25C)
- Identical 144-LQFP pinout to MC68302AG20C enables cost-down speed grade substitution (對比MC68302AG20C)
- On-chip three-channel DMA removes external protocol-controller need (對比MC68340AG25E)
- Silicon revision C is register-compatible with revision B (AG33B) (對比MC68302AG33B)
設計說明
The MC68302AG33C requires a clean +5V +/-5% supply (VCC, VCCSYNTH, AVCC) with bulk decoupling on each rail pair. Place 10uF tantalum and 0.1uF ceramic caps within 1 cm of each VCC pin pair; high-speed transient current on the HCMOS core can otherwise inject noise into the address and data bus, causing DMA underrun or phantom interrupts.
The MC68302AG33C CPU core and DMA engine share the same external data and address bus. If you enable DMA bursts on more than one channel simultaneously without proper bus-arbitration prioritization, the M68000 core can stall for tens of microseconds per burst. Use round-robin or fixed-priority arbitration in the system control registers, and budget CPU throughput for the worst-case burst pattern in your serial traffic model.
Estimated: at 33 MHz CPU clock with three SCCs active and full DMA, the HCMOS core draws approximately 200 mA (1.0 W). The 144-LQFP theta_JA is roughly 50 C/W on a 4-layer JEDEC test board, so junction temperature rise above ambient is ~50C - keep ambient below 75C for industrial applications. Add a copper thermal pad under the exposed die flag area if available, or stitch thermal vias to inner ground planes.
Route the data bus (D0-D15) with matched lengths to within 0.5 inch to avoid skew on UDS/LDS/AS strobes. Keep the 33 MHz CLK trace short and guard it with ground on both sides; long CLK traces will radiate EMI into the SCC RX lines and degrade HDLC receive margin. Place external SRAM close to the address/data bus to minimize bus-arbiter wait-state insertion.
The SCC serial pins (RXD1-3, TXD1-3, RTS, CTS, CD) should be routed away from the parallel port pins (PB0-PB7) and from any switching power-supply traces. Use 33 ohm series resistors at each SCC output to dampen reflections into the on-chip drivers, especially when running at the maximum 33 MHz CPU clock where bus noise can couple into the serial analog front-end.
合規資訊
RoHS compliant and lead-free per distributor listings (DigiKey, Mouser). AEC-Q100 not applicable (industrial/telecom MPU, not automotive-qualified). Halogen-free status not confirmed in available data - defaulting to unknown. Conflict-minerals compliance per NXP corporate policy.
