MC68302EH25C - 25MHz 68K Integrated Comm Processor MPU | NXP
MPN: MC68302EH25C ⚠ Waktu Beli TerakhirMC68302EH25C Ringkasan
Background: A microprocessor (MPU) is the central processing unit of an embedded system, executing instruction code, managing memory, and arbitrating peripheral access. The MC68302EH25C belongs to the M68000 (68K) family of CISC processors, which historically dominated telecommunications and industrial control. The "EH" suffix designates the Enhanced Hardware variant, and "25C" denotes a 25 MHz clock with the ceramic-windowed / commercial (C) temperature designation. This part is a system-on-chip predecessor of the ColdFire family, integrating CPU + DMA + serial + timers into one die.
Key features include a 32-bit M68000 instruction set architecture with 8/16-bit external data bus, a RISC Communications Processor for HDLC/SDLC/UART/Transparent bit-stream handling, three independent full-duplex serial communications controllers (SCC), two serial management controllers (SMC), a 2-channel DMA controller, three timers, 1152 bytes of dual-port RAM for CP/CPU messaging, and an interrupt controller supporting up to 7 external IRQ lines.
The architecture uses a Harvard-style split between the 68000 core and the RISC CP, allowing the CP to handle real-time bit-stream processing autonomously while the 68000 core runs system software. The 8/16-bit dynamic bus interface supports DRAM refresh and glueless memory interfacing, reducing external logic in cost-sensitive designs.
Typical applications include ISDN terminal adapters, X.25 / frame relay packet assemblers, industrial control networks, serial-port multiplexers, and proprietary field-bus bridges. The integrated CP offloads HDLC framing so the 68000 core can manage higher-layer protocols without real-time jitter.
When designing with this device, allocate at least 4.5 us between DMA bursts to avoid starving the SCC FIFOs. Note that this part is NXP End-of-Life; long-term designs should consider the pin-compatible MC68302FC variant or migrate to ColdFire MCF523x.
This page synthesizes distributor stock, NXP end-of-life notices, drop-in alternative guidance, and engineering design notes not found in the original manufacturer datasheet.
Alternatif penggantian untuk MC68302EH25C — paket yang sama, pin-pada-pin kompatibel. Bagian paket yang berbeda memerlukan kerja ulang PCB diabaikan.
Variasi di dalam seri ini
Model-series yang sama yang kompatibel dengan penggantian MC68302EH25C (sama faktor bentuk dan footprint) — berbeda di dalam Mounting Type, Core Architecture, Data Bus Width, Family, Instruction Set.
MC68302FC25C
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MC68302EH16C
✅ Drop-InKontak untuk harga
Lihat Datasheet →MC68302CRC20C
✅ Drop-InKontak untuk harga
Lihat Datasheet →KMC68302EH25C
✅ Drop-In📋 Alternatif referensi (tidak dalam katalog)
MC68302EH25C Rating Maksimal & Karakteristik Listrik
| Core Architecture | M68000 (68K) 32-bit CPU + RISC Communications Processor |
| Family | MC68302 (Integrated Multiprotocol Processor) |
| Operating Frequency | 25 MHz |
| External Data Bus Width | 8/16-Bit |
| Instruction Set | M68000 (32-bit internal, 16-bit external) |
| Paket | 132-PQFP (46 x 46 mm) |
| Tipe Mounting | Surface Mount |
| Tegangan Pemuat | 5 V |
| Serial Communications Controllers (SCC) | 3 (full-duplex) |
| Serial Management Controllers (SMC) | 2 |
| DMA Channels | 2 |
| Timers | 3 (2 general + 1 watchdog) |
| Internal Dual-Port RAM | 1152 bytes |
| External Interrupt Lines | 7 IRQ |
Konfigurasi Pin MC68302EH25C
| Pin produk 1 | A0 — Address bus bit 0 |
| Pin produk 2 | A1 — Address bus bit 1 |
| Pin produk 3 | A2 — Address bus bit 2 |
| Pin produk 4 | A3 — Address bus bit 3 |
| Pin produk 5 | A4 — Address bus bit 4 |
| Pin produk 6 | A5 — Address bus bit 5 |
| Pin produk 7 | A6 — Address bus bit 6 |
| Pin produk 8 | A7 — Address bus bit 7 |
| Pin produk 9 | A8 — Address bus bit 8 |
| Pin produk 10 | A9 — Address bus bit 9 |
| Pin produk 11 | A10 — Address bus bit 10 |
| Pin produk 12 | A11 — Address bus bit 11 |
| Pin produk 13 | GND — Ground |
| Pin produk 14 | A12 — Address bus bit 12 |
| Pin produk 15 | A13 — Address bus bit 13 |
| Pin produk 16 | A14 — Address bus bit 14 |
| Pin produk 17 | A15 — Address bus bit 15 |
| Pin produk 18 | A16 — Address bus bit 16 |
| Pin produk 19 | A17 — Address bus bit 17 |
| Pin produk 20 | A18 — Address bus bit 18 |
| Pin produk 21 | A19 — Address bus bit 19 |
| Pin produk 22 | A20 — Address bus bit 20 |
| Pin produk 23 | A21 — Address bus bit 21 |
| Pin produk 24 | A22 — Address bus bit 22 |
| Pin produk 25 | A23 — Address bus bit 23 |
| Pin produk 26 | GND — Ground |
| Pin produk 27 | D15 — Data bus bit 15 |
| Pin produk 28 | D14 — Data bus bit 14 |
| Pin produk 29 | D13 — Data bus bit 13 |
| Pin produk 30 | D12 — Data bus bit 12 |
| Pin produk 31 | D11 — Data bus bit 11 |
| Pin produk 32 | D10 — Data bus bit 10 |
| Pin produk 33 | D9 — Data bus bit 9 |
| Pin produk 34 | D8 — Data bus bit 8 |
| Pin produk 35 | VCC — 5 V supply |
| Pin produk 36 | D7 — Data bus bit 7 |
| Pin produk 37 | D6 — Data bus bit 6 |
| Pin produk 38 | D5 — Data bus bit 5 |
| Pin produk 39 | D4 — Data bus bit 4 |
| Pin produk 40 | D3 — Data bus bit 3 |
| Pin produk 41 | D2 — Data bus bit 2 |
| Pin produk 42 | D1 — Data bus bit 1 |
| Pin produk 43 | D0 — Data bus bit 0 |
| Pin produk 44 | GND — Ground |
| Pin produk 45 | CS0 — Chip select 0 |
| Pin produk 46 | CS1 — Chip select 1 |
| Pin produk 47 | CS2 — Chip select 2 |
| Pin produk 48 | CS3 — Chip select 3 |
| Pin produk 49 | CS4 — Chip select 4 |
| Pin produk 50 | CS5 — Chip select 5 |
| Pin produk 51 | BR — Bus request |
| Pin produk 52 | BG — Bus grant |
| Pin produk 53 | BGACK — Bus grant acknowledge |
| Pin produk 54 | RESET — Reset input |
| Pin produk 55 | HALT — Halt |
| Pin produk 56 | VCC — 5 V supply |
| Pin produk 57 | R/W — Read/Write |
| Pin produk 58 | DS — Data strobe |
| Pin produk 59 | AS — Address strobe |
| Pin produk 60 | CLKOUT — Clock output |
| Pin produk 61 | XTAL1 — Crystal oscillator input |
| Pin produk 62 | XTAL2 — Crystal oscillator output |
| Pin produk 63 | GND — Ground |
| Pin produk 64 | IRQ1 — Interrupt request 1 |
| Pin produk 65 | IRQ2 — Interrupt request 2 |
| Pin produk 66 | IRQ3 — Interrupt request 3 |
| Pin produk 67 | IRQ4 — Interrupt request 4 |
| Pin produk 68 | IRQ5 — Interrupt request 5 |
| Pin produk 69 | IRQ6 — Interrupt request 6 |
| Pin produk 70 | IRQ7 — Interrupt request 7 |
| Pin produk 71 | VCC — 5 V supply |
| Pin produk 72 | PA0 — Port A bit 0 |
| Pin produk 73 | PA1 — Port A bit 1 |
| Pin produk 74 | PA2 — Port A bit 2 |
| Pin produk 75 | PA3 — Port A bit 3 |
| Pin produk 76 | PA4 — Port A bit 4 |
| Pin produk 77 | PA5 — Port A bit 5 |
| Pin produk 78 | PA6 — Port A bit 6 |
| Pin produk 79 | PA7 — Port A bit 7 |
| Pin produk 80 | GND — Ground |
| Pin produk 81 | PB0 — Port B bit 0 |
| Pin produk 82 | PB1 — Port B bit 1 |
| Pin produk 83 | PB2 — Port B bit 2 |
| Pin produk 84 | PB3 — Port B bit 3 |
| Pin produk 85 | PB4 — Port B bit 4 |
| Pin produk 86 | PB5 — Port B bit 5 |
| Pin produk 87 | PB6 — Port B bit 6 |
| Pin produk 88 | PB7 — Port B bit 7 |
| Pin produk 89 | VCC — 5 V supply |
| Pin produk 90 | TIN1 — Timer 1 input |
| Pin produk 91 | TOUT1 — Timer 1 output |
| Pin produk 92 | TIN2 — Timer 2 input |
| Pin produk 93 | TOUT2 — Timer 2 output |
| Pin produk 94 | PC0 — Port C bit 0 |
| Pin produk 95 | PC1 — Port C bit 1 |
| Pin produk 96 | PC2 — Port C bit 2 |
| Pin produk 97 | PC3 — Port C bit 3 |
| Pin produk 98 | PC4 — Port C bit 4 |
| Pin produk 99 | GND — Ground |
| Pin produk 100 | PC5 — Port C bit 5 |
| Pin produk 101 | PC6 — Port C bit 6 |
| Pin produk 102 | PC7 — Port C bit 7 |
| Pin produk 103 | SCC1_TX — SCC1 transmit data |
| Pin produk 104 | SCC1_RX — SCC1 receive data |
| Pin produk 105 | SCC1_RCLK — SCC1 receive clock |
| Pin produk 106 | SCC1_TCLK — SCC1 transmit clock |
| Pin produk 107 | SCC1_CTS — SCC1 clear-to-send |
| Pin produk 108 | SCC1_RTS — SCC1 request-to-send |
| Pin produk 109 | VCC — 5 V supply |
| Pin produk 110 | SCC2_TX — SCC2 transmit data |
| Pin produk 111 | SCC2_RX — SCC2 receive data |
| Pin produk 112 | SCC2_RCLK — SCC2 receive clock |
| Pin produk 113 | SCC2_TCLK — SCC2 transmit clock |
| Pin produk 114 | SCC2_CTS — SCC2 clear-to-send |
| Pin produk 115 | SCC2_RTS — SCC2 request-to-send |
| Pin produk 116 | SCC3_TX — SCC3 transmit data |
| Pin produk 117 | SCC3_RX — SCC3 receive data |
| Pin produk 118 | GND — Ground |
| Pin produk 119 | SCC3_RCLK — SCC3 receive clock |
| Pin produk 120 | SCC3_TCLK — SCC3 transmit clock |
| Pin produk 121 | SCC3_CTS — SCC3 clear-to-send |
| Pin produk 122 | SCC3_RTS — SCC3 request-to-send |
| Pin produk 123 | SMC1_TX — SMC1 transmit data |
| Pin produk 124 | SMC1_RX — SMC1 receive data |
| Pin produk 125 | VCC — 5 V supply |
| Pin produk 126 | SMC2_TX — SMC2 transmit data |
| Pin produk 127 | SMC2_RX — SMC2 receive data |
| Pin produk 128 | DREQ1 — DMA request 1 |
| Pin produk 129 | DACK1 — DMA acknowledge 1 |
| Pin produk 130 | DREQ2 — DMA request 2 |
| Pin produk 131 | DACK2 — DMA acknowledge 2 |
| Pin produk 132 | AVCC — Analog 5 V supply |
Aplikasi Umum
MC68302EH25C cocok untuk 6 aplikasis: ISDN Terminal Adapter, X.25 / Frame Relay Packet Assembler, Industrial Serial Multiplexer / Field-Bus Bridge, Proprietary RF / Wireline Modem Baseband Controller, Legacy Embedded Router / WAN Edge, Point-of-Sale / Kiosk Terminal Controller.
ISDN Terminal Adapter
The MC68302EH25C's integrated RISC Communications Processor and three SCC channels make it ideal for ISDN terminal adapters that require simultaneous HDLC framing on the D-channel and high-speed data on B-channels. The 25 MHz CPU core handles Q.921/Q.931 call-control software while the off-loaded CP manages bit-level D-channel protocol timing. The 1152-byte dual-port RAM allows zero-copy descriptor passing between the 68000 and CP, minimizing latency for sub-2ms ISDN S/T-interface response requirements. This integration replaces a 68K CPU plus a separate serial-comm controller, reducing PCB area and BOM cost.
Direkomendasikan
X.25 / Frame Relay Packet Assembler
Frame relay and X.25 packet assemblers benefit from the MC68302EH25C's HDLC-capable SCCs and on-chip DMA that move frames between memory and serial lines without CPU intervention. At 25 MHz, the M68000 core can sustain LAP-F state-machine processing while the CP handles CRC-16, flag insertion/detection, and zero-insertion transparently. The two-channel DMA controller supports simultaneous transmit and receive, allowing full-duplex operation at DSU/CSU rates up to 2.048 Mbps. The part's PQFP-132 footprint also enables compact V.35/RS-232 interface board designs.
Direkomendasikan
Industrial Serial Multiplexer / Field-Bus Bridge
Industrial control networks often require a master controller that bridges multiple RS-232/RS-485 field-bus segments to a higher-level Modbus or Profibus backbone, and the MC68302EH25C fits this role. Its three SCCs plus two SMCs provide five independent serial channels, each programmable for UART, HDLC, or transparent modes. The 25 MHz 68000 core executes routing logic while the CP manages deterministic field-bus timing. The PQFP-132 industrial-grade package and 5 V supply support harsh factory environments. Watchdog timer and interrupt controller simplify safety-critical operation.
Direkomendasikan
Proprietary RF / Wireline Modem Baseband Controller
Legacy proprietary modems for SCADA, telemetry, and point-of-sale terminals leverage the MC68302EH25C's integrated CP to perform bit-level modulation/demodulation while the 68000 core handles protocol stacks. The CP's transparent mode allows arbitrary bit patterns, supporting proprietary FSK/PSK modulations without external DSP. The DMA controller streams samples between the modem codec and memory without CPU loading, freeing the core for application-layer processing. The 5 V supply simplifies power design in battery-backed remote installations.
Direkomendasikan
Legacy Embedded Router / WAN Edge
Pre-Ethernet-on-CPU era WAN routers used the MC68302EH25C as the central control processor, with its SCCs interfacing directly to T1/E1 framers and the 68000 core running routing software. While throughput is modest by modern standards (25 MIPS class), the part remains suitable for legacy replacement of installed equipment in industrial SCADA and telecom operator networks. The PQFP-132 footprint allows pin-compatible PCB drop-in for service spares. Pin-compatible variants like the MC68302FC25C extend life of these designs.
Direkomendasikan
Point-of-Sale / Kiosk Terminal Controller
POS terminals, ATM peripherals, and kiosk controllers require reliable multi-port serial connectivity for PIN pads, magnetic-stripe readers, printers, and cash drawers - exactly the use case the MC68302EH25C addresses. Five programmable serial channels (3 SCC + 2 SMC) handle peripheral communication simultaneously. The 25 MHz 68000 core runs terminal application code while the integrated CP offloads transaction-protocol timing. Watchdog timer and interrupt controller provide failsafe behavior required for unattended kiosks.
Direkomendasikan
Ringkasan Produk Direkomendasikan
Data referensi engineering untuk MC68302EH25C — pembandingan, panduan desain, dan informasi konformitas.
Panduan Pemilihan
Pembandingan dengan Alternatif
| Parameter Umum | Produk Ini | MC68302FC25C | MC68302EH16C | MC68302CRC20C | KMC68302EH25C |
|---|---|---|---|---|---|
| Package | 132-PQFP (46 x 46 mm) | 132-PQFP (same) | 132-PQFP (same) | 132-PQFP (same) | 132-PQFP (same) |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Operating Frequency | 25 MHz | 25 MHz | 16 MHz (-36%) | 20 MHz (-20%) | 25 MHz |
| External Data Bus Width | 8/16-Bit | 8/16/32-Bit (enhanced) | 8/16-Bit | 8/16-Bit | 8/16-Bit |
| Core Architecture | M68000 + RISC CP | M68000 + RISC CP | M68000 + RISC CP | M68000 + RISC CP | M68000 + RISC CP |
| Serial Communications Controllers | 3 SCC + 2 SMC | 3 SCC + 2 SMC | 3 SCC + 2 SMC | 3 SCC + 2 SMC | 3 SCC + 2 SMC |
| DMA Channels | 2 | 2 | 2 | 2 | 2 |
| Lifecycle Status | EOL / Last-Time-Buy | EOL | EOL | EOL | EOL |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
Diferensiator Kunci
- Best balance of speed and bus width in MC68302 family (vsMC68302FC25C)
- Industry-standard M68000 instruction set for software reuse (vsColdFire MCF523x)
- Highest speed grade in 8/16-bit EH variant (vsMC68302EH16C)
Catatan Desain
The MC68302EH25C requires a stable 5 V +/- 5% supply with bulk decoupling at each VCC pin (pins 35, 56, 71, 89, 109, 125) and a 0.1 uF ceramic at every VCC/GND pair within 5 mm of the package. Estimated: at 25 MHz with all three SCCs active, total ICC current draw is approximately 200 mA per NXP datasheet typical-operating conditions. Add a Pi filter (10 uF tantalum + ferrite bead) on the supply feed to suppress switching noise from adjacent digital logic.
PQFP-132 packages require a 4-layer PCB with a continuous ground plane under the part to control EMI from the 25 MHz clock edges. Estimated: with 0.2 mm trace width, route address and data buses as 50-ohm impedance-controlled traces and keep total bus length under 100 mm to avoid ringing. Place external memory chips within 50 mm of the MPU to minimize access-time violations. Avoid routing SCC serial signals across clock traces to prevent crosstalk.
When interfacing SCCs to external RS-485 transceivers, add 33-ohm series-termination resistors at the SCC_TX/SCC_RX pins matched to the cable characteristic impedance. The on-chip RISC CP samples serial data on the rising edge of the SCC receive clock; ensure the receive-clock trace length matches the receive-data trace length within +/- 2 mm to avoid bit-time skew. Estimated: at 2.048 Mbps T1/E1 rates, total bit-time budget is 488 ns - allocate 100 ns margin for setup/hold.
Common pitfalls when designing with the MC68302EH25C: (1) Failing to initialize the RISC CP command queue before enabling SCC interrupts causes lockups - always poll CP_CR after reset. (2) The 8/16-bit external bus limits memory throughput; if 32-bit performance is required, migrate to MC68302FC25C. (3) Watchdog timer must be serviced within 1 second of reset or it generates an internal reset. (4) Because the part is EOL, buy sufficient inventory for the entire product lifecycle (typically 7-10 years).
Informasi Konformitas
Compliance status not explicitly stated in the verified distributor data. The PQFP-132 package was historically available in both leaded and lead-free variants. Request compliance certificate from supplier before RoHS-restricted designs.
