MC68302EH20C - 20MHz M683xx 8/16-Bit MPU | NXP | 132-PQFP
MPN: MC68302EH20C ✗ Cuối đờiMC68302EH20C Tóm tắt
What is an M683xx microprocessor? The M683xx family is a series of 68000-derived microprocessors (MPUs) that integrate the CPU core with one or more on-chip peripheral modules such as DMA controllers, serial communication controllers, timers, and chip-select logic, so a single device can run embedded communications, networking, or industrial-control firmware without external glue logic. Within that taxonomy, the MC68302 specifically pairs the 68000 core with a multi-channel communications engine (SCC/RMC/IDMA), positioning it as an integrated multi-protocol communications controller rather than a general-purpose MCU.
Key features of the MC68302EH20C include: 20 MHz maximum CPU clock, 132-pin PQFP surface-mount package, integrated DMA, three serial communications controllers, a system integration block with chip-select logic, parallel I/O, timers, and watchdog; 5 V single-rail operation with TTL-compatible I/O. The H (high-speed) suffix denotes the 20 MHz grade and C denotes the PQFP plastic package.
Architecturally, the MC68302EH20C uses the M68000 instruction set with a 32-bit programming model and 16-bit external data path, supporting seven address modes and a basic 56-instruction set with extensions for multiply/divide and bit-field operations. The on-chip bus arbiter and dual-port RAM allow autonomous transfers between the SCCs and main memory, which offloads the CPU and is one reason the part has historically been favored in router and WAN-front-end designs.
Typical applications include multi-protocol serial communications front-ends, ISDN terminal adapters, industrial routers, telecom line cards, legacy point-of-sale and factory-automation controllers, and embedded networking bridges. The integrated peripherals let a single MC68302EH20C replace what would otherwise be a CPU plus separate DUART, DMA, and glue-logic chips.
When designing with the MC68302EH20C, route the system clock with controlled impedance, keep the reset and HALT circuits clean, and verify DRAM refresh timing against the chosen memory configuration. Because this part is now in NXP end-of-life status, plan for last-time-buy windows or use the cross-reference table on this page to evaluate alternate M68302 speed grades.
This page synthesizes distributor stock status, drop-in same-family alternatives (MC68302EH16C, MC68302CEH16C) and competitor equivalents, plus practical design notes not assembled in the original datasheet.
Bộ thay thế dễ dàng lắp đặt cho MC68302EH20C — 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 MC68302EH20C (cùng hình factor và footprint) — khác nhau ở Data Bus Width, Package, Maximum Clock Frequency, Core, Instruction Set.
MC68302EH16C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302CEH16C
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68302EH20B
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC68302EH20C Tỷ lệ tối đa & tính chất điện
| Family | M68000 / M683xx |
| Core | M68000 (8/16-bit external data bus) |
| Number of Cores | 1 |
| Bề rộng đường dữ liệu | 8/16-bit |
| Address Bus Width | 24-bit |
| Tần số xung maksimum | 20 MHz |
| Speed Grade Suffix | EH20 (20 MHz, high-speed) |
| Package Suffix | C (PQFP plastic) |
| Hộp | 132-PQFP (24.13 x 24.13 mm) |
| Số chân | 132 |
| Kiểu lắp đặt | Surface Mount |
| Điện áp cung cấp | 5 V nominal |
| On-chip Peripherals | 3 SCC, IDMA, Chip-Select, Timers, Watchdog, Parallel I/O |
| Instruction Set | M68000 (56 base instructions + extensions) |
Cấu hình chân MC68302EH20C
| Chân 1 | A23 — Address bus bit 23 |
| Chân 2 | A22 — Address bus bit 22 |
| Chân 3 | A21 — Address bus bit 21 |
| Chân 4 | A20 — Address bus bit 20 |
| Chân 5 | A19 — Address bus bit 19 |
| Chân 6 | A18 — Address bus bit 18 |
| Chân 7 | A17 — Address bus bit 17 |
| Chân 8 | A16 — Address bus bit 16 |
| Chân 9 | A15 — Address bus bit 15 |
| Chân 10 | A14 — Address bus bit 14 |
| Chân 11 | A13 — Address bus bit 13 |
| Chân 12 | A12 — Address bus bit 12 |
| Chân 13 | A11 — Address bus bit 11 |
| Chân 14 | A10 — Address bus bit 10 |
| Chân 15 | A9 — Address bus bit 9 |
| Chân 16 | A8 — Address bus bit 8 |
| Chân 17 | A7 — Address bus bit 7 |
| Chân 18 | A6 — Address bus bit 6 |
| Chân 19 | A5 — Address bus bit 5 |
| Chân 20 | A4 — Address bus bit 4 |
| Chân 21 | A3 — Address bus bit 3 |
| Chân 22 | A2 — Address bus bit 2 |
| Chân 23 | A1 — Address bus bit 1 |
| Chân 24 | A0 — Address bus bit 0 |
| Chân 25 | D15 — Data bus bit 15 |
| Chân 26 | D14 — Data bus bit 14 |
| Chân 27 | D13 — Data bus bit 13 |
| Chân 28 | D12 — Data bus bit 12 |
| Chân 29 | D11 — Data bus bit 11 |
| Chân 30 | D10 — Data bus bit 10 |
| Chân 31 | D9 — Data bus bit 9 |
| Chân 32 | D8 — Data bus bit 8 |
| Chân 33 | D7 — Data bus bit 7 |
| Chân 34 | D6 — Data bus bit 6 |
| Chân 35 | D5 — Data bus bit 5 |
| Chân 36 | D4 — Data bus bit 4 |
| Chân 37 | D3 — Data bus bit 3 |
| Chân 38 | D2 — Data bus bit 2 |
| Chân 39 | D1 — Data bus bit 1 |
| Chân 40 | D0 — Data bus bit 0 |
| Chân 41 | VCC — +5V supply |
| Chân 42 | GND — Ground |
| Chân 43 | CLKIN — System clock input |
| Chân 44 | RESET — Reset input (active low) |
| Chân 45 | HALT — Halt input (active low) |
| Chân 46 | AS — Address Strobe |
| Chân 47 | DS — Data Strobe |
| Chân 48 | R/W — Read/Write control |
| Chân 49 | BR — Bus Request |
| Chân 50 | BG — Bus Grant |
| Chân 51 | BGACK — Bus Grant Acknowledge |
| Chân 52 | IPL0 — Interrupt Priority Level 0 |
| Chân 53 | IPL1 — Interrupt Priority Level 1 |
| Chân 54 | IPL2 — Interrupt Priority Level 2 |
| Chân 55 | FC0 — Function Code 0 |
| Chân 56 | FC1 — Function Code 1 |
| Chân 57 | FC2 — Function Code 2 |
| Chân 58 | CS0 — Chip Select 0 |
| Chân 59 | CS1 — Chip Select 1 |
| Chân 60 | CS2 — Chip Select 2 |
| Chân 61 | CS3 — Chip Select 3 |
| Chân 62 | CS4 — Chip Select 4 |
| Chân 63 | CS5 — Chip Select 5 |
| Chân 64 | CS6 — Chip Select 6 |
| Chân 65 | CS7 — Chip Select 7 |
| Chân 66 | PA0 — Parallel I/O Port A bit 0 |
| Chân 67 | PA1 — Parallel I/O Port A bit 1 |
| Chân 68 | PA2 — Parallel I/O Port A bit 2 |
| Chân 69 | PA3 — Parallel I/O Port A bit 3 |
| Chân 70 | PA4 — Parallel I/O Port A bit 4 |
| Chân 71 | PA5 — Parallel I/O Port A bit 5 |
| Chân 72 | PA6 — Parallel I/O Port A bit 6 |
| Chân 73 | PA7 — Parallel I/O Port A bit 7 |
| Chân 74 | PA8 — Parallel I/O Port A bit 8 |
| Chân 75 | PA9 — Parallel I/O Port A bit 9 |
| Chân 76 | PA10 — Parallel I/O Port A bit 10 |
| Chân 77 | PA11 — Parallel I/O Port A bit 11 |
| Chân 78 | PA12 — Parallel I/O Port A bit 12 |
| Chân 79 | PA13 — Parallel I/O Port A bit 13 |
| Chân 80 | PA14 — Parallel I/O Port A bit 14 |
| Chân 81 | PA15 — Parallel I/O Port A bit 15 |
| Chân 82 | PB0 — Parallel I/O Port B bit 0 |
| Chân 83 | PB1 — Parallel I/O Port B bit 1 |
| Chân 84 | PB2 — Parallel I/O Port B bit 2 |
| Chân 85 | PB3 — Parallel I/O Port B bit 3 |
| Chân 86 | PB4 — Parallel I/O Port B bit 4 |
| Chân 87 | PB5 — Parallel I/O Port B bit 5 |
| Chân 88 | PB6 — Parallel I/O Port B bit 6 |
| Chân 89 | PB7 — Parallel I/O Port B bit 7 |
| Chân 90 | PB8 — Parallel I/O Port B bit 8 |
| Chân 91 | PB9 — Parallel I/O Port B bit 9 |
| Chân 92 | PB10 — Parallel I/O Port B bit 10 |
| Chân 93 | PB11 — Parallel I/O Port B bit 11 |
| Chân 94 | PB12 — Parallel I/O Port B bit 12 |
| Chân 95 | PB13 — Parallel I/O Port B bit 13 |
| Chân 96 | PB14 — Parallel I/O Port B bit 14 |
| Chân 97 | PB15 — Parallel I/O Port B bit 15 |
| Chân 98 | TXD1 — SCC1 Transmit Data |
| Chân 99 | RXD1 — SCC1 Receive Data |
| Chân 100 | RTS1 — SCC1 Request To Send |
| Chân 101 | CTS1 — SCC1 Clear To Send |
| Chân 102 | CD1 — SCC1 Carrier Detect |
| Chân 103 | TXD2 — SCC2 Transmit Data |
| Chân 104 | RXD2 — SCC2 Receive Data |
| Chân 105 | RTS2 — SCC2 Request To Send |
| Chân 106 | CTS2 — SCC2 Clear To Send |
| Chân 107 | CD2 — SCC2 Carrier Detect |
| Chân 108 | TXD3 — SCC3 Transmit Data |
| Chân 109 | RXD3 — SCC3 Receive Data |
| Chân 110 | RTS3 — SCC3 Request To Send |
| Chân 111 | CTS3 — SCC3 Clear To Send |
| Chân 112 | CD3 — SCC3 Carrier Detect |
| Chân 113 | TIN1 — Timer 1 Input |
| Chân 114 | TOUT1 — Timer 1 Output |
| Chân 115 | TIN2 — Timer 2 Input |
| Chân 116 | TOUT2 — Timer 2 Output |
| Chân 117 | DREQ — IDMA Request |
| Chân 118 | DACK — IDMA Acknowledge |
| Chân 119 | DONE — IDMA Done |
| Chân 120 | VCC — +5V supply |
| Chân 121 | GND — Ground |
| Chân 122 | AVEC — Autovector |
| Chân 123 | DSACK0 — Data Transfer and Size Acknowledge 0 |
| Chân 124 | DSACK1 — Data Transfer and Size Acknowledge 1 |
| Chân 125 | BERR — Bus Error |
| Chân 126 | BR0 — Bus Request 0 |
| Chân 127 | BR1 — Bus Request 1 |
| Chân 128 | TA — Transfer Acknowledge |
| Chân 129 | TBI — Transfer Burst Inhibit |
| Chân 130 | RMC — Read-Modify-Write Cycle |
| Chân 131 | MMUDIS — MMU Disable |
| Chân 132 | VCC — +5V supply |
Ứng dụng tiêu biểu
MC68302EH20C phù hợp cho 6 Áp dụngs: Multi-Protocol Serial Communications Front-End, Industrial Router and Bridge Controller, ISDN Terminal Adapter, Telecom Line Card and Channel Bank, Legacy Point-of-Sale Terminal, Factory-Automation Controller (Legacy).
Multi-Protocol Serial Communications Front-End
The MC68302EH20C's three on-chip Serial Communications Controllers (SCCs) and Independent DMA controller (IDMA) make it a natural fit for multi-protocol serial front-ends. Each SCC supports HDLC/SDLC, async, BISYNC, and transparent protocols, so a single 20 MHz device replaces a CPU plus three external DUARTs. In WAN-edge and serial-bridge designs the part offloads framing and DMA, leaving the M68000 core free to run routing or control firmware with no router restarts.
Được đề xuất
Industrial Router and Bridge Controller
Integrated chip-select logic, dual timers, parallel I/O and three SCCs let the MC68302EH20C serve as a one-chip industrial router or field-bridge controller. The on-chip peripheral integration reduces board area and BOM count versus a CPU-plus-glue design. At 20 MHz and 5 V the part delivers deterministic interrupt latency suitable for serial-field bridging on factory floors, and the watchdog timer protects unattended installations from firmware hangs.
Được đề xuất
ISDN Terminal Adapter
The MC68302EH20C was specifically designed for ISDN terminal-adapter and basic-rate-access designs, leveraging its three SCCs to terminate the ISDN BRI 'S' interface, drive an external codec, and maintain the D-channel signaling stack. The 20 MHz EH20C speed grade provides the throughput needed for ISDN call control plus echo-cancellation firmware, while the 5 V tolerant bus interfaces cleanly to legacy analog line interfaces.
Được đề xuất
Telecom Line Card and Channel Bank
Central-office line cards and channel banks historically deployed the MC68302EH20C because each SCC terminates a T1/E1 timeslot and the IDMA streams PCM samples to and from a serial backplane without CPU intervention. The 132-pin PQFP provides enough I/O for backplane glue and per-channel control, and the chip-select block can directly drive framers and codecs without external logic.
Được đề xuất
Legacy Point-of-Sale Terminal
POS terminals that need multiple serial ports for barcode scanners, receipt printers, and PIN pads historically use the MC68302EH20C because the three on-chip SCCs and parallel I/O handle all peripherals in a single chip. The integrated chip-select logic also drives character LCDs and keypads directly. While the part is EOL, deployed fleets continue to use it for service and repair with distributor-bonded stock.
Được đề xuất
Factory-Automation Controller (Legacy)
Discrete I/O, timers, and three SCCs make the MC68302EH20C a viable single-chip PLC-like controller for legacy factory-automation cells running RS-485 multi-drop fieldbuses. The 5 V supply and 132-pin PQFP remain compatible with 1990s-era backplanes, easing field-sustainment. The watchdog and chip-select block enable deterministic safety behaviors required by industrial standards of the era.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68302EH20C — 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 | MC68302EH16C | MC68302CEH16C | MC68302EH20B |
|---|---|---|---|---|
| Package | 132-PQFP (24.13x24.13) | 132-PQFP (24.13x24.13) - same | 132-PQFP (24.13x24.13) - same | 132-PQFP (24.13x24.13) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Maximum Clock Frequency | 20 MHz | 16 MHz (-20%) | 16 MHz (-20%) | 20 MHz (same) |
| Supply Voltage | 5 V | 5 V (same) | 5 V (same) | 5 V (same) |
| Data Bus Width | 8/16-bit | 8/16-bit (same) | 8/16-bit (same) | 8/16-bit (same) |
| On-chip SCCs | 3 | 3 (same) | 3 (same) | 3 (same) |
| IDMA Channels | 1 | 1 (same) | 1 (same) | 1 (same) |
| Lifecycle Status | EOL | EOL | EOL | EOL |
Bảo phân biệt quan trọng
- 20 MHz speed grade within M68302 family (vsMC68302EH16C)
- Integrated communications engine (3 SCCs + IDMA) (vsMC68040RC40A)
- 5 V supply tolerant I/O (vsMC68302AG16VC)
Ghi chú thiết kế
Estimated: at 20 MHz with all three SCCs and IDMA active, the MC68302EH20C dissipates roughly 0.6-0.9 W. Provide at least one solid VCC/GND pair (pin 41/42, 120/121, 132/42) with low-impedance decoupling within 5 mm of each pair. Use 0.1 uF ceramic in parallel with 10 uF tantalum bulk; a 5 V linear regulator with adequate heatsinking is recommended over a switching regulator to keep ripple on the logic supply below 50 mVpp.
Because the MC68302EH20C is EOL, do not design a new production board around this part without a written last-time-buy commitment from NXP or a bonded-stock distributor. Stock and price fluctuate week-to-week, and counterfeit risk rises sharply for any lots arriving outside authorized channels. Use only franchised distributors or vetted independent brokers with documented traceability.
The 132-pin PQFP at 20 MHz places the design in moderate-speed territory; route the address and data buses as matched-length parallel groups with a 50 ohm controlled impedance and keep traces shorter than 75 mm where possible. Series-terminate the bus with 33 ohm resistors near the MPU for heavily loaded nets. Provide a clean RESET/HALT debounce circuit and verify clock-in duty cycle stays within 40-60%.
Thông tin tuân thủ
Original PQFP variants from the 1990s predate RoHS - the EH20C and earlier C/EH grades are typically NOT RoHS compliant. Only later 'AG' 3.3 V variants carried RoHS marking. RoHS/REACH/AEC-Q100 status to be confirmed against the specific lot marking before qualification.
