MC68302EH25C - 25MHz 68K Integrated Comm Processor MPU | NXP
Référence : MC68302EH25C ⚠ Dernier achat| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $45 | $45,00 |
| 10 | $39.5 | $395,00 |
| 100 | $33.75 | $3 375,00 |
| 500 | $28.2 | $14 100,00 |
| 1 000 | $24.95 | $24 950,00 |
MC68302EH25C Présentation
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.
Alternatives de remplacement direct pour MC68302EH25C — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC68302EH25C (même facteur de forme et même empreinte) — différant par Mounting Type, Core Architecture, Data Bus Width, Family, Instruction Set.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC68302FC25C
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68302EH16C
✅ Remplacement direct✓ En stock
$17.1 / unité
Voir la fiche technique →MC68302CRC20C
✅ Remplacement direct✓ En stock
$47.8 / unité
Voir la fiche technique →KMC68302EH25C
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68302EH25C Valeurs maximales et caractéristiques électriques
| 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) |
| Boîtier | 132-PQFP (46 x 46 mm) |
| Type de montage | Surface Mount |
| Tension d'alimentation | 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 |
Configuration des broches de MC68302EH25C
| Broche 1 | A0 — Address bus bit 0 |
| Broche 2 | A1 — Address bus bit 1 |
| Broche 3 | A2 — Address bus bit 2 |
| Broche 4 | A3 — Address bus bit 3 |
| Broche 5 | A4 — Address bus bit 4 |
| Broche 6 | A5 — Address bus bit 5 |
| Broche 7 | A6 — Address bus bit 6 |
| Broche 8 | A7 — Address bus bit 7 |
| Broche 9 | A8 — Address bus bit 8 |
| Broche 10 | A9 — Address bus bit 9 |
| Broche 11 | A10 — Address bus bit 10 |
| Broche 12 | A11 — Address bus bit 11 |
| Broche 13 | GND — Ground |
| Broche 14 | A12 — Address bus bit 12 |
| Broche 15 | A13 — Address bus bit 13 |
| Broche 16 | A14 — Address bus bit 14 |
| Broche 17 | A15 — Address bus bit 15 |
| Broche 18 | A16 — Address bus bit 16 |
| Broche 19 | A17 — Address bus bit 17 |
| Broche 20 | A18 — Address bus bit 18 |
| Broche 21 | A19 — Address bus bit 19 |
| Broche 22 | A20 — Address bus bit 20 |
| Broche 23 | A21 — Address bus bit 21 |
| Broche 24 | A22 — Address bus bit 22 |
| Broche 25 | A23 — Address bus bit 23 |
| Broche 26 | GND — Ground |
| Broche 27 | D15 — Data bus bit 15 |
| Broche 28 | D14 — Data bus bit 14 |
| Broche 29 | D13 — Data bus bit 13 |
| Broche 30 | D12 — Data bus bit 12 |
| Broche 31 | D11 — Data bus bit 11 |
| Broche 32 | D10 — Data bus bit 10 |
| Broche 33 | D9 — Data bus bit 9 |
| Broche 34 | D8 — Data bus bit 8 |
| Broche 35 | VCC — 5 V supply |
| Broche 36 | D7 — Data bus bit 7 |
| Broche 37 | D6 — Data bus bit 6 |
| Broche 38 | D5 — Data bus bit 5 |
| Broche 39 | D4 — Data bus bit 4 |
| Broche 40 | D3 — Data bus bit 3 |
| Broche 41 | D2 — Data bus bit 2 |
| Broche 42 | D1 — Data bus bit 1 |
| Broche 43 | D0 — Data bus bit 0 |
| Broche 44 | GND — Ground |
| Broche 45 | CS0 — Chip select 0 |
| Broche 46 | CS1 — Chip select 1 |
| Broche 47 | CS2 — Chip select 2 |
| Broche 48 | CS3 — Chip select 3 |
| Broche 49 | CS4 — Chip select 4 |
| Broche 50 | CS5 — Chip select 5 |
| Broche 51 | BR — Bus request |
| Broche 52 | BG — Bus grant |
| Broche 53 | BGACK — Bus grant acknowledge |
| Broche 54 | RESET — Reset input |
| Broche 55 | HALT — Halt |
| Broche 56 | VCC — 5 V supply |
| Broche 57 | R/W — Read/Write |
| Broche 58 | DS — Data strobe |
| Broche 59 | AS — Address strobe |
| Broche 60 | CLKOUT — Clock output |
| Broche 61 | XTAL1 — Crystal oscillator input |
| Broche 62 | XTAL2 — Crystal oscillator output |
| Broche 63 | GND — Ground |
| Broche 64 | IRQ1 — Interrupt request 1 |
| Broche 65 | IRQ2 — Interrupt request 2 |
| Broche 66 | IRQ3 — Interrupt request 3 |
| Broche 67 | IRQ4 — Interrupt request 4 |
| Broche 68 | IRQ5 — Interrupt request 5 |
| Broche 69 | IRQ6 — Interrupt request 6 |
| Broche 70 | IRQ7 — Interrupt request 7 |
| Broche 71 | VCC — 5 V supply |
| Broche 72 | PA0 — Port A bit 0 |
| Broche 73 | PA1 — Port A bit 1 |
| Broche 74 | PA2 — Port A bit 2 |
| Broche 75 | PA3 — Port A bit 3 |
| Broche 76 | PA4 — Port A bit 4 |
| Broche 77 | PA5 — Port A bit 5 |
| Broche 78 | PA6 — Port A bit 6 |
| Broche 79 | PA7 — Port A bit 7 |
| Broche 80 | GND — Ground |
| Broche 81 | PB0 — Port B bit 0 |
| Broche 82 | PB1 — Port B bit 1 |
| Broche 83 | PB2 — Port B bit 2 |
| Broche 84 | PB3 — Port B bit 3 |
| Broche 85 | PB4 — Port B bit 4 |
| Broche 86 | PB5 — Port B bit 5 |
| Broche 87 | PB6 — Port B bit 6 |
| Broche 88 | PB7 — Port B bit 7 |
| Broche 89 | VCC — 5 V supply |
| Broche 90 | TIN1 — Timer 1 input |
| Broche 91 | TOUT1 — Timer 1 output |
| Broche 92 | TIN2 — Timer 2 input |
| Broche 93 | TOUT2 — Timer 2 output |
| Broche 94 | PC0 — Port C bit 0 |
| Broche 95 | PC1 — Port C bit 1 |
| Broche 96 | PC2 — Port C bit 2 |
| Broche 97 | PC3 — Port C bit 3 |
| Broche 98 | PC4 — Port C bit 4 |
| Broche 99 | GND — Ground |
| Broche 100 | PC5 — Port C bit 5 |
| Broche 101 | PC6 — Port C bit 6 |
| Broche 102 | PC7 — Port C bit 7 |
| Broche 103 | SCC1_TX — SCC1 transmit data |
| Broche 104 | SCC1_RX — SCC1 receive data |
| Broche 105 | SCC1_RCLK — SCC1 receive clock |
| Broche 106 | SCC1_TCLK — SCC1 transmit clock |
| Broche 107 | SCC1_CTS — SCC1 clear-to-send |
| Broche 108 | SCC1_RTS — SCC1 request-to-send |
| Broche 109 | VCC — 5 V supply |
| Broche 110 | SCC2_TX — SCC2 transmit data |
| Broche 111 | SCC2_RX — SCC2 receive data |
| Broche 112 | SCC2_RCLK — SCC2 receive clock |
| Broche 113 | SCC2_TCLK — SCC2 transmit clock |
| Broche 114 | SCC2_CTS — SCC2 clear-to-send |
| Broche 115 | SCC2_RTS — SCC2 request-to-send |
| Broche 116 | SCC3_TX — SCC3 transmit data |
| Broche 117 | SCC3_RX — SCC3 receive data |
| Broche 118 | GND — Ground |
| Broche 119 | SCC3_RCLK — SCC3 receive clock |
| Broche 120 | SCC3_TCLK — SCC3 transmit clock |
| Broche 121 | SCC3_CTS — SCC3 clear-to-send |
| Broche 122 | SCC3_RTS — SCC3 request-to-send |
| Broche 123 | SMC1_TX — SMC1 transmit data |
| Broche 124 | SMC1_RX — SMC1 receive data |
| Broche 125 | VCC — 5 V supply |
| Broche 126 | SMC2_TX — SMC2 transmit data |
| Broche 127 | SMC2_RX — SMC2 receive data |
| Broche 128 | DREQ1 — DMA request 1 |
| Broche 129 | DACK1 — DMA acknowledge 1 |
| Broche 130 | DREQ2 — DMA request 2 |
| Broche 131 | DACK2 — DMA acknowledge 2 |
| Broche 132 | AVCC — Analog 5 V supply |
Applications typiques
MC68302EH25C convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68302EH25C — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Best balance of speed and bus width in MC68302 family (vs MC68302FC25C)
- Industry-standard M68000 instruction set for software reuse (vs ColdFire MCF523x)
- Highest speed grade in 8/16-bit EH variant (vs MC68302EH16C)
Notes de conception
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).
Informations de conformité
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.
