MC68302AG33C - 33MHz M68302 Integrated Comm Processor | NXP
MPN: MC68302AG33C ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $32.5 | $32.50 |
| 10 | $29.1 | $291.00 |
| 100 | $24.85 | $2,485.00 |
| 500 | $21.2 | $10,600.00 |
| 1,000 | $18.4 | $18,400.00 |
MC68302AG33C Overview
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.
Drop-in alternatives for MC68302AG33C — 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 MC68302AG33C (same form factor and footprint) — differing in Core Architecture, DMA Channels, RoHS Status, Address Bus Width, Data Bus Width.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MC68302FC25C
✅ Drop-In📋 Reference alternative (not in catalog)
MC68302AG25C
✅ Drop-In✓ In Stock
$16.4 / Unit
View Datasheet →MC68302AG33B
✅ Drop-In📋 Reference alternative (not in catalog)
MC68302AG20C
✅ Drop-In✓ In Stock
$54.1 / Unit
View Datasheet →MC68302AG16C
✅ Drop-In✓ In Stock
$13.55 / Unit
View Datasheet →MC68302AG33C Maximum Ratings & Electrical Characteristics
| 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 |
| Supply Voltage | 5 V |
| Package / Case | 144-LQFP (20x20 mm) |
| Mounting Type | 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 Status | RoHS Compliant |
MC68302AG33C Pin Configuration
| Pin 1 | D15 — Data bus bit 15 |
| Pin 2 | D14 — Data bus bit 14 |
| Pin 3 | D13 — Data bus bit 13 |
| Pin 4 | D12 — Data bus bit 12 |
| Pin 5 | D11 — Data bus bit 11 |
| Pin 6 | D10 — Data bus bit 10 |
| Pin 7 | D9 — Data bus bit 9 |
| Pin 8 | D8 — Data bus bit 8 |
| Pin 9 | D7 — Data bus bit 7 |
| Pin 10 | D6 — Data bus bit 6 |
| Pin 11 | D5 — Data bus bit 5 |
| Pin 12 | D4 — Data bus bit 4 |
| Pin 13 | D3 — Data bus bit 3 |
| Pin 14 | D2 — Data bus bit 2 |
| Pin 15 | D1 — Data bus bit 1 |
| Pin 16 | D0 — Data bus bit 0 |
| Pin 17 | VCC — +5V supply |
| Pin 18 | GND — Ground |
| Pin 19 | A0 — Address bus bit 0 |
| Pin 20 | A1 — Address bus bit 1 |
| Pin 21 | A2 — Address bus bit 2 |
| Pin 22 | A3 — Address bus bit 3 |
| Pin 23 | A4 — Address bus bit 4 |
| Pin 24 | A5 — Address bus bit 5 |
| Pin 25 | A6 — Address bus bit 6 |
| Pin 26 | A7 — Address bus bit 7 |
| Pin 27 | A8 — Address bus bit 8 |
| Pin 28 | A9 — Address bus bit 9 |
| Pin 29 | A10 — Address bus bit 10 |
| Pin 30 | A11 — Address bus bit 11 |
| Pin 31 | A12 — Address bus bit 12 |
| Pin 32 | A13 — Address bus bit 13 |
| Pin 33 | A14 — Address bus bit 14 |
| Pin 34 | A15 — Address bus bit 15 |
| Pin 35 | A16 — Address bus bit 16 |
| Pin 36 | A17 — Address bus bit 17 |
| Pin 37 | A18 — Address bus bit 18 |
| Pin 38 | A19 — Address bus bit 19 |
| Pin 39 | A20 — Address bus bit 20 |
| Pin 40 | A21 — Address bus bit 21 |
| Pin 41 | A22 — Address bus bit 22 |
| Pin 42 | A23 — Address bus bit 23 |
| Pin 43 | AS — Address Strobe |
| Pin 44 | R/W — Read/Write |
| Pin 45 | UDS — Upper Data Strobe |
| Pin 46 | LDS — Lower Data Strobe |
| Pin 47 | DTACK — Data Transfer Acknowledge |
| Pin 48 | BR — Bus Request |
| Pin 49 | BG — Bus Grant |
| Pin 50 | BGACK — Bus Grant Acknowledge |
| Pin 51 | RESET — Reset input |
| Pin 52 | HALT — Halt input |
| Pin 53 | CLK — System clock input |
| Pin 54 | VCC — +5V supply |
| Pin 55 | GND — Ground |
| Pin 56 | IRQ1 — Interrupt request 1 |
| Pin 57 | IRQ2 — Interrupt request 2 |
| Pin 58 | IRQ3 — Interrupt request 3 |
| Pin 59 | IRQ4 — Interrupt request 4 |
| Pin 60 | IRQ5 — Interrupt request 5 |
| Pin 61 | IRQ6 — Interrupt request 6 |
| Pin 62 | IRQ7 — Interrupt request 7 |
| Pin 63 | TCLK — Timer clock |
| Pin 64 | TOUT — Timer output |
| Pin 65 | PA0 — Parallel I/O / SCC1 RXD |
| Pin 66 | PA1 — Parallel I/O / SCC1 TXD |
| Pin 67 | PA2 — Parallel I/O / SCC1 RTS |
| Pin 68 | PA3 — Parallel I/O / SCC1 CTS |
| Pin 69 | PA4 — Parallel I/O / SCC1 CD |
| Pin 70 | PA5 — Parallel I/O / SCC2 RXD |
| Pin 71 | PA6 — Parallel I/O / SCC2 TXD |
| Pin 72 | PA7 — Parallel I/O / SCC2 RTS |
| Pin 73 | PA8 — Parallel I/O / SCC2 CTS |
| Pin 74 | PA9 — Parallel I/O / SCC2 CD |
| Pin 75 | PA10 — Parallel I/O / SCC3 RXD |
| Pin 76 | PA11 — Parallel I/O / SCC3 TXD |
| Pin 77 | PA12 — Parallel I/O / SCC3 RTS |
| Pin 78 | PA13 — Parallel I/O / SCC3 CTS |
| Pin 79 | PA14 — Parallel I/O / SCC3 CD |
| Pin 80 | PA15 — Parallel I/O / SCC3 BRG |
| Pin 81 | VCC — +5V supply |
| Pin 82 | GND — Ground |
| Pin 83 | PB0 — Parallel I/O port B bit 0 |
| Pin 84 | PB1 — Parallel I/O port B bit 1 |
| Pin 85 | PB2 — Parallel I/O port B bit 2 |
| Pin 86 | PB3 — Parallel I/O port B bit 3 |
| Pin 87 | PB4 — Parallel I/O port B bit 4 |
| Pin 88 | PB5 — Parallel I/O port B bit 5 |
| Pin 89 | PB6 — Parallel I/O port B bit 6 |
| Pin 90 | PB7 — Parallel I/O port B bit 7 |
| Pin 91 | PC0 — Parallel I/O port C bit 0 |
| Pin 92 | PC1 — Parallel I/O port C bit 1 |
| Pin 93 | PC2 — Parallel I/O port C bit 2 |
| Pin 94 | PC3 — Parallel I/O port C bit 3 |
| Pin 95 | PC4 — Parallel I/O port C bit 4 |
| Pin 96 | PC5 — Parallel I/O port C bit 5 |
| Pin 97 | PC6 — Parallel I/O port C bit 6 |
| Pin 98 | PC7 — Parallel I/O port C bit 7 |
| Pin 99 | TXD1 — SCC1 transmit data |
| Pin 100 | RXD1 — SCC1 receive data |
| Pin 101 | RTS1 — SCC1 request to send |
| Pin 102 | CTS1 — SCC1 clear to send |
| Pin 103 | CD1 — SCC1 carrier detect |
| Pin 104 | TXD2 — SCC2 transmit data |
| Pin 105 | RXD2 — SCC2 receive data |
| Pin 106 | RTS2 — SCC2 request to send |
| Pin 107 | CTS2 — SCC2 clear to send |
| Pin 108 | CD2 — SCC2 carrier detect |
| Pin 109 | TXD3 — SCC3 transmit data |
| Pin 110 | RXD3 — SCC3 receive data |
| Pin 111 | RTS3 — SCC3 request to send |
| Pin 112 | CTS3 — SCC3 clear to send |
| Pin 113 | CD3 — SCC3 carrier detect |
| Pin 114 | SP_TXD — SCP transmit data |
| Pin 115 | SP_RXD — SCP receive data |
| Pin 116 | SP_CLK — SCP clock |
| Pin 117 | SP_RTS — SCP request to send |
| Pin 118 | VCC — +5V supply |
| Pin 119 | GND — Ground |
| Pin 120 | DREQ0 — DMA request 0 |
| Pin 121 | DACK0 — DMA acknowledge 0 |
| Pin 122 | DONE0 — DMA done 0 |
| Pin 123 | DREQ1 — DMA request 1 |
| Pin 124 | DACK1 — DMA acknowledge 1 |
| Pin 125 | DONE1 — DMA done 1 |
| Pin 126 | DREQ2 — DMA request 2 |
| Pin 127 | DACK2 — DMA acknowledge 2 |
| Pin 128 | DONE2 — DMA done 2 |
| Pin 129 | TXCLK — Transmit clock |
| Pin 130 | RXCLK — Receive clock |
| Pin 131 | TRCLK — Transmit/receive clock |
| Pin 132 | VCC — +5V supply |
| Pin 133 | GND — Ground |
| Pin 134 | FC0 — Function code 0 |
| Pin 135 | FC1 — Function code 1 |
| Pin 136 | FC2 — Function code 2 |
| Pin 137 | AVEC — Autovector |
| Pin 138 | IACK — Interrupt acknowledge |
| Pin 139 | IPEND — Interrupt pending |
| Pin 140 | MODCK — Mode clock |
| Pin 141 | XTAL1 — Crystal oscillator input |
| Pin 142 | XTAL2 — Crystal oscillator output |
| Pin 143 | TEST — Test mode |
| Pin 144 | VCCSYNTH — +5V synthesized logic supply |
Typical Applications
MC68302AG33C is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for MC68302AG33C — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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 |
Key Differentiators
- Highest 33 MHz CPU clock in the M68302 family (vs MC68302FC25C)
- Identical 144-LQFP pinout to MC68302AG20C enables cost-down speed grade substitution (vs MC68302AG20C)
- On-chip three-channel DMA removes external protocol-controller need (vs MC68340AG25E)
- Silicon revision C is register-compatible with revision B (AG33B) (vs MC68302AG33B)
Design Notes
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.
Compliance Information
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.
