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NXP Semiconductors MCM69C432TQ20
- Part No.:
- MCM69C432TQ20
- Manufacturer:
- NXP Semiconductors
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
MCM69C432TQ20.pdf
- Description:
- IC RAM 1MBIT PAR 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,371
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Product details
Overview
MCM69C432TQ20 from Freescale Semiconductor is a 16K × 64-bit content-addressable memory (CAM) IC with programmable match/output field widths, 180 ns match time, and dual-port architecture (control + match ports), designed for high-speed datacom lookup in ATM switches (OC12, 622 Mbps) and Ethernet/Fast Ethernet MAC address resolution.
For engineers reviewing the MCM69C432TQ20 datasheet, MCM69C432TQ20 pinout, MCM69C432TQ20 application, or MCM69C432TQ20 equivalent, key selection considerations include match latency, JTAG testability, 3.3 V single-supply operation, depth-expansion capability via cascading, and ATM-mode concurrent VPC/VCC search support.
Technical Context
The MCM69C432TQ20 implements a fully parallel CAM architecture with separate control and match ports, enabling concurrent table management and real-time lookup. Its global mask register enables bit-level "don't care" matching, and its buffered/fast-entry modes provide trade-offs between dynamic update latency and initialization overhead.
Match operations execute in fixed 180 ns at 50 MHz clock rate, with open-drain outputs (MC, MS, VPC, IRQ, DTACK) supporting wired-OR expansion. The device supports IEEE 1149.1 JTAG boundary-scan and includes dedicated ATM mode for simultaneous Virtual Path Circuit (VPC) and Virtual Connection Circuit (VCC) detection using defined VPI/VCI bit fields.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 16,384 × 64-bit entries - supports large-scale forwarding tables in telecom switching fabric. |
| Match Time | 180 ns - deterministic latency critical for OC12 (622 Mbps) cell processing in ATM systems. |
| Clock Rate | 50 MHz maximum - defines minimum cycle time for match port timing and instruction throughput. |
| Supply Voltage | 3.3 V ±5% - single-rail compatibility with modern 3.3 V logic families and reduced power vs. 5 V CAMs. |
| Package | 100-pin TQFP (Case 983A–01) - surface-mount footprint with thermal resistance θJA = 36°C/W (4-layer board, 200 LFPM). |
| JTAG Support | IEEE 1149.1 compliant - enables production test, boundary-scan diagnostics, and debug visibility without external probes. |
| Match Duty Cycle | User-configurable via idle time - allows tuning between match request rate and entry insertion/deletion bandwidth (e.g., ~555 ops/sec at 40 ns idle). |
Pinout & Package
100-pin Thin Quad Flat Package (TQFP), RoHS-compliant, body size 14 mm × 14 mm, 0.5 mm pitch. Thermal pad on underside not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| K | Match Port Clock Input | Primary timing reference for match operations; max 50 MHz; drives internal match pipeline. |
| LH/SM | Match Initiation Control | Latch High/Start Match - triggers parallel comparison of MQ[31:0] against all 16K entries. |
| MQ[31:0] | Match Data I/O Bus | 32-bit bidirectional bus for match input and matched output data; low-order 32 bits always driven on match hit. |
| MC | Match Complete Flag | Open-drain output asserted after 180 ns - signals end of match cycle; used for handshake synchronization. |
| MS | Match Successful Flag | Open-drain output asserted only if match found - enables conditional downstream logic or interrupt generation. |
| VPC | Virtual Path Circuit Indicator | Open-drain output active during ATM-mode VPC match - separates path-level from connection-level hits. |
| G | MQ Output Enable | Controls tri-state of MQ[31:0] - required to enable output drivers when reading matched data. |
| A[2:0], DQ[15:0], WE, SEL, DTACK, IRQ | Control Port Interface | Asynchronous 16-bit data/address/control bus for table programming, status readback, and error handling. |
| TCK, TMS, TDI, TDO, TRST | JTAG Test Access Port | Fully compliant IEEE 1149.1 interface - supports boundary-scan testing and device-level diagnostics. |
| VDD / VSS | Power Supply Pins | 32 dedicated VDD (3.3 V) and 17 VSS pins - distributed for low-noise operation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Match/Output Field Widths | Enables flexible partitioning of 64-bit entries - e.g., 16-bit VPI + 16-bit VCI + 32-bit output in ATM mode. |
| Concurrent Control & Match Ports | Allows background table updates (via control port) while performing live lookups (via match port) - no operational stall. |
| Depth Expansion by Cascading | MQ bus high-impedance on no-match enables daisy-chaining multiple MCM69C432TQ20 devices for >16K entry capacity. |
| ATM Mode with VPC/VCC Separation | Dedicated VPC pin and dual-match logic allow simultaneous detection of virtual paths and circuits - essential for OC12 switch fabric. |
| Buffered vs. Fast Entry Modes | Buffered mode enables dynamic updates without halting matching; fast mode optimizes initial table load but requires 80 ms initialization before use. |
Applications
| ATM Switching Fabric | Ethernet/Fast Ethernet Bridge |
|---|---|
Use Scenario: OC12 (622 Mbps) asynchronous transfer mode switch performing VPI/VCI translation on incoming cells. IC Role / Device Role / Timing Role: Primary CAM for real-time header lookup; processes one cell per 180 ns match cycle. Use Value: Enables line-rate switching with deterministic latency - eliminates software-based lookup bottlenecks in hardware forwarding engines. |
Use Scenario: Layer 2 bridge performing MAC address learning and forwarding decisions in Fast Ethernet (100 Mbps) networks. IC Role / Device Role / Timing Role: Content-addressable lookup engine for destination MAC address resolution in cut-through switching. Use Value: Delivers sub-200 ns address match time - supports wire-speed bridging with zero packet buffering delay. |
| Telecom Signaling Router | Network Processor Offload |
Use Scenario: SS7 or SIP signaling router requiring rapid lookup of call routing tables based on dialed digits or session IDs. IC Role / Device Role / Timing Role: Dedicated CAM accelerator for protocol-specific pattern matching; operates alongside main CPU. Use Value: Reduces host processor interrupt load - handles >500 table insertions/deletions per second while maintaining 180 ns match SLA. |
Use Scenario: Embedded network processor offloading forwarding table lookups from software stack to hardware. IC Role / Device Role / Timing Role: External CAM co-processor interfaced via parallel control port; provides deterministic match latency independent of CPU load. Use Value: Enables scalable forwarding performance - supports up to 16K entries without DRAM-based hash table collisions or software traversal delays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar content-addressable memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT71V67605S180BQI | 256K × 18-bit CAM; 180 ns match; 3.3 V; 165-pin PQFP - higher density but wider data bus and larger footprint. | Targeted at high-port-count switches requiring >64-bit match fields; lacks ATM-specific VPC/VCC logic. | Choose for scalability beyond 16K entries; avoid if VPI/VCI separation or TQFP space constraints apply. |
| Cypress CY7C170V21-15ZXC | 16K × 36-bit CAM; 15 ns match; 3.3 V; 100-pin TQFP - faster match time but narrower data width and no JTAG. | Suited for low-latency filtering where 36-bit keys suffice; no native ATM mode or VPC signaling. | Choose when sub-20 ns match latency is mandatory and 64-bit entry width is not required. |
Compared with IDT71V67605S180BQI and CY7C170V21-15ZXC, the MCM69C432TQ20 uniquely balances 64-bit flexibility, ATM-mode VPC/VCC differentiation, JTAG testability, and 100-pin TQFP packaging - making it optimal for OC12-compliant telecom infrastructure where protocol-aware matching is essential.
Availability
MCM69C432TQ20 is available at Aetrix Electronics and suitable for telecom switching fabric, Ethernet bridging hardware, and network processor offload designs requiring stable component supply across extended product lifecycles.
Supply support for MCM69C432TQ20 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded processing, networking, and analog solutions for automotive, industrial, and communications markets.
The MCM69C432TQ20 belongs to Freescale's high-speed CAM product line, engineered specifically for deterministic, low-latency packet classification and header translation in telecom and datacom infrastructure equipment.
FAQ
What is the guaranteed match time for the MCM69C432TQ20 under worst-case conditions?
The MCM69C432TQ20 guarantees a maximum match time of 180 ns across commercial temperature range (0°C to 70°C) and 3.3 V ±5% supply, as specified in the AC operating conditions section of the Freescale datasheet. This value is independent of match field width or mask configuration and applies to both standard and ATM modes.
Does the MCM69C432TQ20 support true dual-port concurrent operation?
Yes, the MCM69C432TQ20 supports true concurrent operation: the control port (A[2:0], DQ[15:0], WE, SEL) handles table programming and status reads, while the match port (K, LH/SM, MQ[31:0], MC, MS, VPC) performs parallel lookups - with no arbitration or blocking between ports.
How does ATM mode change the behavior of the MCM69C432TQ20?
In ATM mode, the MCM69C432TQ20 enables concurrent VPC and VCC detection: VPC matches assert both MS and VPC pins, while VCC matches assert only MS. Bit fields are fixed - VCI in bits 32–47, VPI in bits 48–59 - and the VPC pin provides hardware-level path/circuit discrimination without software parsing.
What is the purpose of the global mask register in the MCM69C432TQ20?
The global mask register in the MCM69C432TQ20 defines which bits participate in match comparisons: a '0' enables comparison on that bit, while a '1' makes it a "don't care." It is written via the SET GLOBAL–MASK REGISTER instruction and must be configured before loading entries to ensure correct match semantics.
Can the MCM69C432TQ20 be cascaded for larger table capacity, and how is this implemented?
Yes, the MCM69C432TQ20 supports depth expansion by cascading: when no match occurs, MQ[31:0] enters high-impedance state, allowing the next device in chain to drive the bus. This requires external logic to OR MC/MS signals and manage priority resolution across devices - documented in Freescale's application notes for multi-CAM systems.
MCM69C432TQ20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- RAM
- Technology:
- CAM
- Memory Size:
- 1Mbit
- Memory Organization:
- 16K x 64
- Memory Interface:
- Parallel
- Clock Frequency:
- 50 MHz
- Write Cycle Time - Word, Page:
- -
- Access Time:
- -
- Voltage - Supply:
- 3.135V ~ 3.465V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x20)
MCM69C432TQ20 FAQ
1.How can I place an order for MCM69C432TQ20 through Aetrix?
Please submit a Request for Quotation (RFQ) for MCM69C432TQ20 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCM69C432TQ20 reliable?
The price and inventory of MCM69C432TQ20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCM69C432TQ20 is usually 5 days.
3.What payment methods are accepted for MCM69C432TQ20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCM69C432TQ20 transactions.
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4.How is shipping managed for MCM69C432TQ20?
MCM69C432TQ20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCM69C432TQ20 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCM69C432TQ20?
For technical support, including MCM69C432TQ20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCM69C432TQ20 requirements.
6.How does Aetrix verify that MCM69C432TQ20 is sourced from the original manufacturer or authorized distributors?
All MCM69C432TQ20 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCM69C432TQ20 meets industry standards.
7.What is the process for return or replacement of MCM69C432TQ20?
All MCM69C432TQ20 units undergo pre-shipment inspection (PSI). If there is an issue with MCM69C432TQ20, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCM69C432TQ20 part is unused and in its original packaging.
Return procedure for MCM69C432TQ20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MCM69C432TQ20 Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24C04C-SSHM-T
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