MC68302AG33C - 33MHz M68302 Integrated Comm Processor | NXP
MPN: MC68302AG33C ⚠ Lần mua cuốiMC68302AG33C Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MC68302AG33C — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC68302AG33C (cùng hình factor và footprint) — khác nhau ở Core Architecture, DMA Channels, RoHS Status, Address Bus Width, Data Bus Width.
MC68302FC25C
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68302AG25C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302AG33B
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68302AG20C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302AG16C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302AG33C Tỷ lệ tối đa & tính chất điện
| 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 |
| Điện áp cung cấp | 5 V |
| Hộp / Vỏ | 144-LQFP (20x20 mm) |
| Kiểu lắp đặt | 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 |
| Trạng thái RoHS | RoHS Compliant |
Cấu hình chân MC68302AG33C
| Chân 1 | D15 — Data bus bit 15 |
| Chân 2 | D14 — Data bus bit 14 |
| Chân 3 | D13 — Data bus bit 13 |
| Chân 4 | D12 — Data bus bit 12 |
| Chân 5 | D11 — Data bus bit 11 |
| Chân 6 | D10 — Data bus bit 10 |
| Chân 7 | D9 — Data bus bit 9 |
| Chân 8 | D8 — Data bus bit 8 |
| Chân 9 | D7 — Data bus bit 7 |
| Chân 10 | D6 — Data bus bit 6 |
| Chân 11 | D5 — Data bus bit 5 |
| Chân 12 | D4 — Data bus bit 4 |
| Chân 13 | D3 — Data bus bit 3 |
| Chân 14 | D2 — Data bus bit 2 |
| Chân 15 | D1 — Data bus bit 1 |
| Chân 16 | D0 — Data bus bit 0 |
| Chân 17 | VCC — +5V supply |
| Chân 18 | GND — Ground |
| Chân 19 | A0 — Address bus bit 0 |
| Chân 20 | A1 — Address bus bit 1 |
| Chân 21 | A2 — Address bus bit 2 |
| Chân 22 | A3 — Address bus bit 3 |
| Chân 23 | A4 — Address bus bit 4 |
| Chân 24 | A5 — Address bus bit 5 |
| Chân 25 | A6 — Address bus bit 6 |
| Chân 26 | A7 — Address bus bit 7 |
| Chân 27 | A8 — Address bus bit 8 |
| Chân 28 | A9 — Address bus bit 9 |
| Chân 29 | A10 — Address bus bit 10 |
| Chân 30 | A11 — Address bus bit 11 |
| Chân 31 | A12 — Address bus bit 12 |
| Chân 32 | A13 — Address bus bit 13 |
| Chân 33 | A14 — Address bus bit 14 |
| Chân 34 | A15 — Address bus bit 15 |
| Chân 35 | A16 — Address bus bit 16 |
| Chân 36 | A17 — Address bus bit 17 |
| Chân 37 | A18 — Address bus bit 18 |
| Chân 38 | A19 — Address bus bit 19 |
| Chân 39 | A20 — Address bus bit 20 |
| Chân 40 | A21 — Address bus bit 21 |
| Chân 41 | A22 — Address bus bit 22 |
| Chân 42 | A23 — Address bus bit 23 |
| Chân 43 | AS — Address Strobe |
| Chân 44 | R/W — Read/Write |
| Chân 45 | UDS — Upper Data Strobe |
| Chân 46 | LDS — Lower Data Strobe |
| Chân 47 | DTACK — Data Transfer Acknowledge |
| Chân 48 | BR — Bus Request |
| Chân 49 | BG — Bus Grant |
| Chân 50 | BGACK — Bus Grant Acknowledge |
| Chân 51 | RESET — Reset input |
| Chân 52 | HALT — Halt input |
| Chân 53 | CLK — System clock input |
| Chân 54 | VCC — +5V supply |
| Chân 55 | GND — Ground |
| Chân 56 | IRQ1 — Interrupt request 1 |
| Chân 57 | IRQ2 — Interrupt request 2 |
| Chân 58 | IRQ3 — Interrupt request 3 |
| Chân 59 | IRQ4 — Interrupt request 4 |
| Chân 60 | IRQ5 — Interrupt request 5 |
| Chân 61 | IRQ6 — Interrupt request 6 |
| Chân 62 | IRQ7 — Interrupt request 7 |
| Chân 63 | TCLK — Timer clock |
| Chân 64 | TOUT — Timer output |
| Chân 65 | PA0 — Parallel I/O / SCC1 RXD |
| Chân 66 | PA1 — Parallel I/O / SCC1 TXD |
| Chân 67 | PA2 — Parallel I/O / SCC1 RTS |
| Chân 68 | PA3 — Parallel I/O / SCC1 CTS |
| Chân 69 | PA4 — Parallel I/O / SCC1 CD |
| Chân 70 | PA5 — Parallel I/O / SCC2 RXD |
| Chân 71 | PA6 — Parallel I/O / SCC2 TXD |
| Chân 72 | PA7 — Parallel I/O / SCC2 RTS |
| Chân 73 | PA8 — Parallel I/O / SCC2 CTS |
| Chân 74 | PA9 — Parallel I/O / SCC2 CD |
| Chân 75 | PA10 — Parallel I/O / SCC3 RXD |
| Chân 76 | PA11 — Parallel I/O / SCC3 TXD |
| Chân 77 | PA12 — Parallel I/O / SCC3 RTS |
| Chân 78 | PA13 — Parallel I/O / SCC3 CTS |
| Chân 79 | PA14 — Parallel I/O / SCC3 CD |
| Chân 80 | PA15 — Parallel I/O / SCC3 BRG |
| Chân 81 | VCC — +5V supply |
| Chân 82 | GND — Ground |
| Chân 83 | PB0 — Parallel I/O port B bit 0 |
| Chân 84 | PB1 — Parallel I/O port B bit 1 |
| Chân 85 | PB2 — Parallel I/O port B bit 2 |
| Chân 86 | PB3 — Parallel I/O port B bit 3 |
| Chân 87 | PB4 — Parallel I/O port B bit 4 |
| Chân 88 | PB5 — Parallel I/O port B bit 5 |
| Chân 89 | PB6 — Parallel I/O port B bit 6 |
| Chân 90 | PB7 — Parallel I/O port B bit 7 |
| Chân 91 | PC0 — Parallel I/O port C bit 0 |
| Chân 92 | PC1 — Parallel I/O port C bit 1 |
| Chân 93 | PC2 — Parallel I/O port C bit 2 |
| Chân 94 | PC3 — Parallel I/O port C bit 3 |
| Chân 95 | PC4 — Parallel I/O port C bit 4 |
| Chân 96 | PC5 — Parallel I/O port C bit 5 |
| Chân 97 | PC6 — Parallel I/O port C bit 6 |
| Chân 98 | PC7 — Parallel I/O port C bit 7 |
| Chân 99 | TXD1 — SCC1 transmit data |
| Chân 100 | RXD1 — SCC1 receive data |
| Chân 101 | RTS1 — SCC1 request to send |
| Chân 102 | CTS1 — SCC1 clear to send |
| Chân 103 | CD1 — SCC1 carrier detect |
| Chân 104 | TXD2 — SCC2 transmit data |
| Chân 105 | RXD2 — SCC2 receive data |
| Chân 106 | RTS2 — SCC2 request to send |
| Chân 107 | CTS2 — SCC2 clear to send |
| Chân 108 | CD2 — SCC2 carrier detect |
| Chân 109 | TXD3 — SCC3 transmit data |
| Chân 110 | RXD3 — SCC3 receive data |
| Chân 111 | RTS3 — SCC3 request to send |
| Chân 112 | CTS3 — SCC3 clear to send |
| Chân 113 | CD3 — SCC3 carrier detect |
| Chân 114 | SP_TXD — SCP transmit data |
| Chân 115 | SP_RXD — SCP receive data |
| Chân 116 | SP_CLK — SCP clock |
| Chân 117 | SP_RTS — SCP request to send |
| Chân 118 | VCC — +5V supply |
| Chân 119 | GND — Ground |
| Chân 120 | DREQ0 — DMA request 0 |
| Chân 121 | DACK0 — DMA acknowledge 0 |
| Chân 122 | DONE0 — DMA done 0 |
| Chân 123 | DREQ1 — DMA request 1 |
| Chân 124 | DACK1 — DMA acknowledge 1 |
| Chân 125 | DONE1 — DMA done 1 |
| Chân 126 | DREQ2 — DMA request 2 |
| Chân 127 | DACK2 — DMA acknowledge 2 |
| Chân 128 | DONE2 — DMA done 2 |
| Chân 129 | TXCLK — Transmit clock |
| Chân 130 | RXCLK — Receive clock |
| Chân 131 | TRCLK — Transmit/receive clock |
| Chân 132 | VCC — +5V supply |
| Chân 133 | GND — Ground |
| Chân 134 | FC0 — Function code 0 |
| Chân 135 | FC1 — Function code 1 |
| Chân 136 | FC2 — Function code 2 |
| Chân 137 | AVEC — Autovector |
| Chân 138 | IACK — Interrupt acknowledge |
| Chân 139 | IPEND — Interrupt pending |
| Chân 140 | MODCK — Mode clock |
| Chân 141 | XTAL1 — Crystal oscillator input |
| Chân 142 | XTAL2 — Crystal oscillator output |
| Chân 143 | TEST — Test mode |
| Chân 144 | VCCSYNTH — +5V synthesized logic supply |
Ứng dụng tiêu biểu
MC68302AG33C phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68302AG33C — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Highest 33 MHz CPU clock in the M68302 family (vsMC68302FC25C)
- Identical 144-LQFP pinout to MC68302AG20C enables cost-down speed grade substitution (vsMC68302AG20C)
- On-chip three-channel DMA removes external protocol-controller need (vsMC68340AG25E)
- Silicon revision C is register-compatible with revision B (AG33B) (vsMC68302AG33B)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
