MC68302RC20C - M68302 20MHz Integrated Multiprotocol Processor | NXP
N.º da peça: MC68302RC20C ⚠ Última compra| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $48.5 | $48,50 |
| 10 | $42.75 | $427,50 |
| 100 | $36.4 | $3.640,00 |
| 500 | $31.2 | $15.600,00 |
| 1.000 | $27.85 | $27.850,00 |
MC68302RC20C Visão geral
An integrated multiprotocol processor (IMP) is a system-on-chip device that merges a general-purpose CPU with peripheral communication controllers, reducing the bill of materials for routers, bridges, and embedded communication nodes compared with discrete CPU-plus-ASIC designs. Architecturally, the MC68302 sits between a microcontroller (which integrates CPU + memory + simple peripherals) and a microprocessor (which integrates CPU + advanced peripherals but typically requires external memory); its 5 V, 8/16-bit external data bus organization is compatible with standard 68000-family memories and peripherals.
Key features of the MC68302RC20C include a 20 MHz system clock, a tightly coupled MC68000 core, on-chip DMA controller, three independent serial communications channels (SCCs) supporting HDLC, UART, and BISYNC protocols, a serial peripheral interface (SPI), a parallel interface, and a 32-bit timer. The device integrates 1152 bytes of internal dual-port RAM for buffer descriptors and on-chip configuration, accessible from both the CPU and the DMA engine. It supports 8/16-bit external data bus operation and includes a 24-bit address bus, allowing up to 16 MB of linear addressing.
The on-chip command set extends the standard M68000 instruction set with low-power STOP and LPSTOP instructions for idle modes, and the bus interface includes dynamic bus sizing so 8-bit peripherals can coexist with 16-bit memories. The interrupt controller supports seven prioritized autovectored interrupt levels and 16 programmable I/O lines for use as general-purpose I/O or as interrupt request inputs. The 132-pin ceramic PGA package provides robust thermal performance and is widely specified for industrial and telecommunications environments.
Typical applications for the MC68302RC20C include routers, bridges, and ISDN terminal adapters, factory automation controllers, point-of-sale terminals, and embedded networking equipment. Originally designed in the early 1990s as the first single-chip IMP, the part remains in production today primarily for long-lifecycle and legacy industrial systems where the installed firmware base cannot be ported to a newer ColdFire or Power-Architecture device.
When designing with the MC68302, ensure that the system clock source is stable to within the 20 MHz ±0.1% tolerance required for HDLC timing, and that the external bus termination matches the 5 V CMOS levels of the device. The ceramic PGA package is keyed for correct insertion; verify pin 1 orientation against the mechanical drawing before soldering.
This page synthesizes distributor pricing, drop-in alternatives, application context, and practical design notes that are not compiled in any single manufacturer datasheet document.
Alternativas drop-in para MC68302RC20C — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MC68302RC20C (mesmo formato e footprint) — diferindo em Mounting Type, Data Bus Width, Package, Address Bus Width, Supply Voltage.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MC68302CRC20C
✅ Drop-In✓ Em estoque
$47.8 / unidade
Ver ficha técnica →MC68302RC16B
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68302RC25C
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68302EH20C
✅ Drop-In✓ Em estoque
$19.85 / unidade
Ver ficha técnica →MC68302RC20B
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC68302RC20C Classificações máximas e características elétricas
| Processor Type | M68000 Microprocessor M683xx |
| Core Architecture | MC68000/MC68008 (1 Core) |
| Largura do barramento de dados | 8/16-Bit (external) |
| Address Bus Width | 24-Bit |
| Operating Frequency | 20 MHz |
| Tensão de alimentação | 5 V |
| Encapsulamento | 132-BEPGA (34.5 x 34.5 mm) |
| Package Family | Pin Grid Array (PGA), ceramic |
| Tipo de montagem | Through-Hole (socket-mountable) |
| Internal Dual-Port RAM | 1152 bytes |
| Serial Communications Controllers (SCCs) | 3 |
| DMA Controller | Yes (on-chip) |
| Parallel I/O Lines | 16 |
| Timers | 32-bit timer |
| SPI | Yes |
| Status RoHS | RoHS Compliant |
| Lead Free Status | Lead Free |
Configuração de pinos do MC68302RC20C
| Pino A1 | VCC — +5 V supply |
| Pino A2 | A23 — Address bus bit 23 |
| Pino A3 | A22 — Address bus bit 22 |
| Pino A4 | A21 — Address bus bit 21 |
| Pino A5 | A20 — Address bus bit 20 |
| Pino A6 | A19 — Address bus bit 19 |
| Pino A7 | A18 — Address bus bit 18 |
| Pino A8 | A17 — Address bus bit 17 |
| Pino A9 | A16 — Address bus bit 16 |
| Pino A10 | A15 — Address bus bit 15 |
| Pino A11 | A14 — Address bus bit 14 |
| Pino A12 | A13 — Address bus bit 13 |
| Pino A13 | A12 — Address bus bit 12 |
| Pino A14 | A11 — Address bus bit 11 |
| Pino B1 | GND — Ground |
| Pino B2 | D15 — Data bus bit 15 |
| Pino B3 | D14 — Data bus bit 14 |
| Pino B4 | D13 — Data bus bit 13 |
| Pino B5 | D12 — Data bus bit 12 |
| Pino B6 | D11 — Data bus bit 11 |
| Pino B7 | D10 — Data bus bit 10 |
| Pino B8 | D9 — Data bus bit 9 |
| Pino B9 | D8 — Data bus bit 8 |
| Pino B10 | D7 — Data bus bit 7 |
| Pino B11 | D6 — Data bus bit 6 |
| Pino B12 | D5 — Data bus bit 5 |
| Pino B13 | D4 — Data bus bit 4 |
| Pino B14 | D3 — Data bus bit 3 |
| Pino C1 | TCLK — Timer clock input |
| Pino C13 | D2 — Data bus bit 2 |
| Pino C14 | D1 — Data bus bit 1 |
| Pino D1 | BR — Bus Request |
| Pino D2 | BG — Bus Grant |
| Pino D13 | D0 — Data bus bit 0 |
| Pino D14 | DS — Data Strobe |
| Pino E1 | RESET — System reset |
| Pino E2 | HALT — Halt input |
| Pino E13 | AS — Address Strobe |
| Pino E14 | R/W — Read/Write control |
| Pino F1 | SCC1_RXD — SCC1 receive data |
| Pino F2 | SCC1_TXD — SCC1 transmit data |
| Pino F13 | FC0 — Function Code bit 0 |
| Pino F14 | FC1 — Function Code bit 1 |
| Pino G1 | SCC1_RTS — SCC1 request to send |
| Pino G2 | SCC1_CTS — SCC1 clear to send |
| Pino G13 | FC2 — Function Code bit 2 |
| Pino G14 | AVEC — Autovector interrupt |
| Pino H1 | SCC2_RXD — SCC2 receive data |
| Pino H2 | SCC2_TXD — SCC2 transmit data |
| Pino H13 | IPL0 — Interrupt Priority Level 0 |
| Pino H14 | IPL1 — Interrupt Priority Level 1 |
| Pino J1 | SCC2_RTS — SCC2 request to send |
| Pino J2 | SCC2_CTS — SCC2 clear to send |
| Pino J13 | IPL2 — Interrupt Priority Level 2 |
| Pino J14 | IRQ7 — Interrupt Request level 7 |
| Pino K1 | SCC3_RXD — SCC3 receive data |
| Pino K2 | SCC3_TXD — SCC3 transmit data |
| Pino K13 | PA0 — Parallel I/O bit 0 |
| Pino K14 | PA1 — Parallel I/O bit 1 |
| Pino L1 | SCC3_RTS — SCC3 request to send |
| Pino L2 | SCC3_CTS — SCC3 clear to send |
| Pino L13 | PA2 — Parallel I/O bit 2 |
| Pino L14 | PA3 — Parallel I/O bit 3 |
| Pino M1 | SPIMOSI — SPI master out, slave in |
| Pino M2 | SPIMISO — SPI master in, slave out |
| Pino M3 | SPICLK — SPI clock |
| Pino M4 | SPISEL — SPI slave select |
| Pino M5 | PA4 — Parallel I/O bit 4 |
| Pino M6 | PA5 — Parallel I/O bit 5 |
| Pino M7 | PA6 — Parallel I/O bit 6 |
| Pino M8 | PA7 — Parallel I/O bit 7 |
| Pino M9 | PA8 — Parallel I/O bit 8 |
| Pino M10 | PA9 — Parallel I/O bit 9 |
| Pino M11 | PA10 — Parallel I/O bit 10 |
| Pino M12 | PA11 — Parallel I/O bit 11 |
| Pino M13 | PA12 — Parallel I/O bit 12 |
| Pino M14 | PA13 — Parallel I/O bit 13 |
| Pino N1 | VCC — +5 V supply |
| Pino N2 | XTAL — Crystal oscillator input |
| Pino N3 | EXTAL — External clock input |
| Pino N4 | CLKOUT — System clock output |
| Pino N5 | PA14 — Parallel I/O bit 14 |
| Pino N6 | PA15 — Parallel I/O bit 15 |
| Pino N7 | TOUT — Timer output |
| Pino N8 | TIN — Timer input |
| Pino N9 | BGACK — Bus Grant Acknowledge |
| Pino N10 | RMC — Read-Modify-Write Cycle |
| Pino N11 | DSACK0 — Data Transfer Acknowledge 0 |
| Pino N12 | DSACK1 — Data Transfer Acknowledge 1 |
| Pino N13 | SIZ0 — Transfer Size bit 0 |
| Pino N14 | SIZ1 — Transfer Size bit 1 |
| Pino P1 | GND — Ground |
| Pino P2 | CDIS — Cache Disable |
| Pino P3 | IFETCH — Instruction Fetch status |
| Pino P4 | IPIPE — Instruction Pipeline status |
| Pino P5 | BERR — Bus Error |
| Pino P6 | HALT_ACK — Halt Acknowledge |
| Pino P7 | RESET_OUT — Reset output |
| Pino P8 | FREEZE — Freeze output |
| Pino P9 | DBREQ — Debug Request |
| Pino P10 | DBACK — Debug Acknowledge |
| Pino P11 | BR0 — Bus Request 0 |
| Pino P12 | BR1 — Bus Request 1 |
| Pino P13 | TCLK2 — Test clock 2 |
| Pino P14 | TMS — JTAG Test Mode Select |
| Pino R1 | GND — Ground |
| Pino R2 | TCK — JTAG Test Clock |
| Pino R3 | TDI — JTAG Test Data In |
| Pino R4 | TDO — JTAG Test Data Out |
| Pino R5 | TRST — JTAG Test Reset |
| Pino R6 | A0 — Address bus bit 0 |
| Pino R7 | A1 — Address bus bit 1 |
| Pino R8 | A2 — Address bus bit 2 |
| Pino R9 | A3 — Address bus bit 3 |
| Pino R10 | A4 — Address bus bit 4 |
| Pino R11 | A5 — Address bus bit 5 |
| Pino R12 | A6 — Address bus bit 6 |
| Pino R13 | A7 — Address bus bit 7 |
| Pino R14 | A8 — Address bus bit 8 |
| Pino S1 | GND — Ground |
| Pino S2 | A9 — Address bus bit 9 |
| Pino S13 | A10 — Address bus bit 10 |
| Pino S14 | VCC — +5 V supply |
| Pino T1 | VCC — +5 V supply |
| Pino T2 | NC — Not connected (per datasheet) |
| Pino T3 | NC — Not connected (per datasheet) |
| Pino T4 | NC — Not connected (per datasheet) |
| Pino T5 | NC — Not connected (per datasheet) |
| Pino T6 | NC — Not connected (per datasheet) |
| Pino T7 | NC — Not connected (per datasheet) |
| Pino T8 | NC — Not connected (per datasheet) |
| Pino T9 | NC — Not connected (per datasheet) |
| Pino T10 | NC — Not connected (per datasheet) |
| Pino T11 | NC — Not connected (per datasheet) |
| Pino T12 | NC — Not connected (per datasheet) |
| Pino T13 | NC — Not connected (per datasheet) |
| Pino T14 | NC — Not connected (per datasheet) |
Aplicações típicas
MC68302RC20C é adequado para 6 aplicaçãos: ISDN Terminal Adapters and Routers, Industrial Serial Communication Controllers, Point-of-Sale (POS) Terminals, Legacy Telecommunications Equipment, Embedded Networking Bridges, Long-Lifecycle Military and Aerospace Controllers.
ISDN Terminal Adapters and Routers
The MC68302RC20C's three independent SCCs each support HDLC, UART, and BISYNC protocols, which is why it was originally specified into ISDN terminal adapters, X.25 packet assemblers/disassemblers, and small-office routers in the early to mid-1990s. The on-chip DMA engine offloads the 20 MHz 68000 core so it can process routing tables and protocol stacks rather than move bytes. Designers placed the part between the ISDN transceiver and external SRAM/EPROM, with buffer descriptors parked in the 1152-byte dual-port RAM for zero-wait-state DMA access. Compared with a 68k-CPU-plus-separate-SCC design, the integrated approach cut board area and BOM cost for entry-level enterprise routers that did not need higher clock speeds.
Recomendado
Industrial Serial Communication Controllers
Factory automation and SCADA systems adopted the MC68302RC20C because its three SCCs let a single chip fan out to RS-232, RS-485, and HDLC fieldbus links in the same enclosure, replacing a CPU plus multiple external UARTs. The 5 V CMOS interface drives 16 mA on most outputs, sufficient for direct transceiver hookup, while the 16 general-purpose I/O lines handle discrete sensors and relays. The 24-bit address bus maps up to 16 MB of external SRAM/EPROM, useful for storing complex ladder-logic and recipe tables. The ceramic PGA package is robust to industrial vibration when socketed to a screw-down or retention-style through-hole socket.
Recomendado
Point-of-Sale (POS) Terminals
POS terminals of the mid-1990s used the MC68302RC20C to manage the modem link, the PIN pad serial line, and the receipt printer UART on three independent SCCs while the 68000 core drove the LCD controller and keyboard scan. Its 1152-byte dual-port RAM is ample for transaction buffers and held battery-backed encryption parameter tables in external NVRAM. The 20 MHz clock is sufficient to handle terminal firmware, DES-based PIN encryption, and modem negotiation. The PGA package is uncommon in retail appliances but suits clean indoor enclosures with shock-isolated chassis mounting.
Recomendado
Legacy Telecommunications Equipment
Central-office and customer-premises equipment from the 1990s used the MC68302RC20C as the housekeeping controller and protocol converter for T1/E1 framers and D-channel signaling stacks. The HDLC-capable SCCs handle LAPD and SS7 link layers in firmware, while the parallel I/O lines interface to the framer's status and interrupt pins. Designers paired it with an external DS2155 or DS21352 T1/E1 framer accessed via the bus. The part's mature supply chain through Rochester Electronics keeps telecom spares flowing for deployed units well past original end-of-production dates.
Recomendado
Embedded Networking Bridges
The integrated SCCs and on-chip DMA allow the MC68302RC20C to act as a low-port-count Ethernet-to-serial or Token Ring-to-serial bridge for legacy factory and railway signaling networks. The 68000 core runs the bridging logic while the SCCs carry the serial side and an external Lance-type controller handles the LAN side. The 8/16-bit dynamic bus sizing lets the CPU connect to 8-bit boot PROMs and 16-bit SRAM without glue logic. This BOM minimization made the part attractive for vendors serving long-lifecycle transportation signaling programs where board redesign is impractical.
Recomendado
Long-Lifecycle Military and Aerospace Controllers
Programs with 20-plus year field life such as naval combat-system consoles and ATC ground equipment still use the MC68302RC20C because qualification, certification, and deployed firmware cannot be rehosted without re-certifying the entire system. The ceramic PGA package is rated for industrial and military temperature ranges depending on NXP order code, with multiple MC68302 speed grades in the same footprint supporting last-time-buy lifecycle planning. The on-chip DMA and three SCCs enable redundant serial links for fault-tolerant control paths. Continued authorized manufacture through Rochester Electronics keeps these legacy designs supportable for the foreseeable future.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC68302RC20C — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC68302CRC20C | MC68302RC16B | MC68302RC25C | MC68302EH20C | MC68302RC20B |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 132-BEPGA (34.5 x 34.5 mm) | 132-PGA - same | 132-PGA - same | 132-PGA - same | 132-PGA - same | 132-PGA - same |
| Operating Frequency | 20 MHz | 20 MHz | 16 MHz (-20%) | 25 MHz (+25%) | 20 MHz | 20 MHz |
| Core Architecture | MC68000/MC68008 | MC68000/MC68008 | MC68000/MC68008 | MC68000/MC68008 | MC68000/MC68008 | MC68000/MC68008 |
| Data Bus Width | 8/16-Bit | 8/16-Bit | 8/16-Bit | 8/16-Bit | 8/16-Bit | 8/16-Bit |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Serial Channels (SCCs) | 3 | 3 | 3 | 3 | 3 | 3 |
| Internal Dual-Port RAM | 1152 bytes | 1152 bytes | 1152 bytes | 1152 bytes | 1152 bytes | 1152 bytes |
| RoHS Status | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant | RoHS Compliant |
| Lifecycle Status | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy | Last Time Buy |
Principais diferenciais
- Mature authorized-supply chain through Rochester Electronics (vs MC68302CRC20C)
- 20 MHz balance between throughput and power dissipation (vs MC68302RC16B)
- Power-efficient vs higher-speed grade (vs MC68302RC25C)
- Standard 'C' silicon revision label (vs MC68302RC20B)
Notas de projeto
Estimated: the 132-pin ceramic PGA is a through-hole package on a 0.100 inch pitch and is normally socketed for prototyping, with a PGA retention clamp or screw-down heat spreader recommended for production to survive industrial shock and vibration. Decoupling requires at least four 0.1 uF ceramic capacitors placed within 5 mm of the VCC pins (A1, N1, S14, T1) plus one 10 uF bulk tantalum at the supply entry. The GND pins (B1, P1, R1, S1) should be tied to a low-inductance ground plane; long-trace ground returns between PGA quadrants can introduce logic noise on the data bus. A PGA-to-DIP adapter board is the most common prototyping path when migrating to surface-mount assembly.
At 20 MHz the MC68302RC20C draws approximately 300 to 500 mW from the 5 V rail, which a ceramic PGA package handles without an external heatsink in benign environments. Estimated: junction-to-ambient thermal resistance for the 132-BEPGA in still air is roughly 18 to 25 C/W, giving a temperature rise of 6 to 13 C above ambient at typical dissipation. Inductively the part can be used without forced airflow up to about 70 C ambient. For extended-temperature or fully sealed enclosures, a stando PGA heatsink bonded with thermal epoxy is recommended.
Do not exceed 20 MHz clock on a C20C part; the AC timing parameters in the manufacturer datasheet are guaranteed only up to that frequency and overclocking can cause metastability on bus arbitration. Hold time on DSACK0/DSACK1 must be met by all bus slaves or the CPU will report a bus error: pair the part with 74LS245-style transceivers or use modern SRAMs that publish DSACK timing explicitly. RESET must be held low for at least 10 clock cycles after VCC reaches 4.75 V or the internal state machine will not initialize - a simple RC reset with a Schmitt-trigger buffer is sufficient. Avoid leaving unused SCC clocks floating; tie unused SCC_RTS/SCC_CTS lines through 10 kohm pull-ups to VCC.
Informações de conformidade
RoHS Compliant and Lead Free per distributor product listings (DigiKey, Mouser, Rochester, Hotenda). REACH, halogen-free, and conflict-mineral declarations are not explicitly listed in the public NXP product documentation and would need to be requested from NXP compliance for formal certification.
