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Texas Instruments SN74ABT3612-30PCB
- Part No.:
- SN74ABT3612-30PCB
- Manufacturer:
- Texas Instruments
- Category:
- FIFOs Memory
- Package:
- 120-LQFP
- Datasheet:
-
SN74ABT3612-30PCB.pdf
- Description:
- IC FIFO SYNC 64X36X2 120HLQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,100
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Product details
Overview
SN74ABT3612-30PCB from Texas Instruments is a clocked bidirectional FIFO memory IC with two independent 64 × 36 dual-port SRAM buffers, supporting asynchronous or coincident CLKA/CLKB operation up to 67 MHz, 10 ns read access time, and passive parity checking on both 36-bit ports. It enables high-throughput data buffering between mismatched microprocessor buses in telecom backplanes.
For engineers reviewing the SN74ABT3612-30PCB datasheet, SN74ABT3612-30PCB pinout, SN74ABT3612-30PCB application, or SN74ABT3612-30PCB equivalent, key selection criteria include dual-clock domain synchronization, programmable almost-full/empty flag offsets (4–16 words), mailbox-bypass register support, and BiCMOS low-power timing performance at industrial temperature range (0°C to 70°C).
Technical Context
The SN74ABT3612-30PCB implements two independent clocked FIFOs (FIFO1 and FIFO2), each with separate write/read pointers, full/empty flag logic, and two-stage synchronizers for all status flags-EFA/FFA/AEA/AFA synchronized to CLKA, EFB/FFB/AEB/AFB to CLKB. Its mailbox registers (mail1/mail2) provide zero-latency command handshaking without queuing delay.
Flag offset programming uses FS0/FS1 latched on RST rising edge to select 4, 8, 12, or 16-word thresholds for almost-full and almost-empty conditions. Parity generation (PGA/PGB) and checking (PEFA/PEFB) operate per-byte (4 × 9-bit groups) with ODD/EVEN-selectable mode, sharing parity trees between port inputs and mailbox outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Depth × Width × Ports | 64 × 36 × 2 independent FIFOs-enables simultaneous bidirectional buffering of 36-bit data streams with 64-word depth per direction. |
| Max Clock Frequency | 67 MHz-supports high-speed interconnect between PCI, VME, or custom parallel buses without throttling throughput. |
| Read Access Time | 10 ns-guarantees sub-15 ns latency for FIFO output register reads under worst-case industrial conditions. |
| Operating Temperature | 0°C to 70°C-validated for commercial/industrial embedded systems where ambient thermal cycling occurs. |
| Supply Voltage | 5 V ± 5%-compatible with legacy TTL/ABT logic families and eliminates need for level-shifting in 5-V systems. |
| Parity Support | Per-port byte-level parity check/generation (4 × 9-bit groups)-detects single-bit errors on A0–A35 and B0–B35 with selectable odd/even mode. |
| Flag Synchronization | Two-stage flip-flop sync per flag-reduces metastability risk when CLKA and CLKB operate asynchronously across clock domains. |
Pinout & Package
SN74ABT3612-30PCB is housed in a 120-pin Thin Quad Flat Package (TQFP), designated PCB in TI documentation, with 0.4 mm lead pitch and exposed thermal pad. Pin numbering follows standard top-view orientation with corner pin #1 marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A35, B0–B35 | 36-bit bidirectional data ports | Independent I/O lanes for Port-A and Port-B; high-impedance when CSA/CSB or W/RA/W/RB high-enables bus sharing without external transceivers. |
| CLKA, CLKB | Asynchronous port clocks | Continuous free-running clocks; all transfers gated on low-to-high transition-allows independent clock domain operation or synchronous alignment. |
| ENA, ENB | Port enable controls | High-active enables for CLKA/CLKB sampling-prevents spurious writes/reads during clock startup or glitch periods. |
| CSA, CSB | Chip select inputs | Active-low enables for port access-permits multiple SN74ABT3612-30PCB devices on shared data buses using address decoding. |
| EFA/EFB, FFA/FFB | Synchronized empty/full flags | Two-stage synced outputs indicate FIFO state relative to CLKA/CLKB-ensures reliable handshake signaling across clock boundaries. |
| AEA/AEB, AFA/AFB | Programmable almost-empty/full flags | Configurable threshold flags (4/8/12/16 words) latched on RST↑-enables early flow control before buffer exhaustion or overflow. |
| MBA, MBB | Mailbox select inputs | Selects mail1/mail2 register instead of FIFO output-provides deterministic latency bypass path for control messages or DMA setup. |
| RST | Asynchronous reset input | Four CLKA + four CLKB transitions required for full initialization-ensures pointer and flag consistency across both clock domains. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | CLKA and CLKB support fully asynchronous operation or precise coincidence-eliminates need for clock domain crossing logic in heterogeneous systems. |
| Mailbox-bypass registers | Two 36-bit mail1/mail2 registers with MBF1/MBF2 handshaking flags-enables immediate command transfer without FIFO queuing delay or pointer management. |
| Programmable flag offsets | FS0/FS1 select 4, 8, 12, or 16-word thresholds for AFA/AEA/AFB/AEB-allows fine-grained flow control tuning for varying burst lengths and latency budgets. |
| Shared parity hardware | Same parity trees serve port inputs and mailbox outputs-reduces die area while maintaining error detection integrity for both buffered and bypassed data paths. |
| BiCMOS process technology | Combines bipolar speed with CMOS power efficiency-delivers 67 MHz operation at <200 mW typical active power, suitable for dense backplane modules. |
Applications
| Telecom Line Card Buffering | Industrial PLC Data Aggregation |
|---|---|
Use Scenario: Buffering packetized voice/data between TDM framer and ATM switch fabric operating at different clock rates. IC Role / Device Role / Timing Role: Clocked FIFO bridging asynchronous 8 kHz TDM and 622 Mbps ATM clock domains with deterministic latency and lossless framing. Use Value: Eliminates bit slips and frame misalignment by absorbing clock drift via dual 64-word depth, while mailbox registers pass control signals (e.g., alarm triggers) with zero FIFO delay. | Use Scenario: Consolidating sensor readings from multiple RS-485 fieldbus nodes into a central controller with variable scan intervals. IC Role / Device Role / Timing Role: Bidirectional FIFO managing bursty analog input acquisition and deterministic output actuation commands across non-synchronous scan cycles. Use Value: Prevents data overrun during peak sensor sampling and ensures timely actuator updates using programmable almost-full/empty flags to throttle upstream acquisition rate. |
| PCI-to-Local Bus Bridge | Medical Imaging Data Pipeline |
Use Scenario: Interfacing 33 MHz PCI bus to custom 50 MHz imaging processor local bus with differing burst protocols. IC Role / Device Role / Timing Role: Dual-port FIFO decoupling PCI master writes and local bus reads, with mailbox registers delivering DMA descriptors ahead of payload transfers. Use Value: Achieves sustained 264 MB/s throughput (33 MHz × 8 bytes) while isolating PCI arbitration delays from real-time image processing deadlines. | Use Scenario: Streaming raw pixel data from CT detector array to reconstruction engine with strict jitter tolerance (<5 ns cycle-to-cycle variation). IC Role / Device Role / Timing Role: Low-jitter FIFO providing 10 ns access time and two-stage flag synchronization to meet DICOM latency constraints. Use Value: Guarantees sub-microsecond end-to-end latency for 16-bit pixel words, with parity checking ensuring data integrity across radiation-prone environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar clocked FIFO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT72V2105L15PF | 3.3 V supply, 15 ns access, 256 × 18 depth, LVDS-compatible I/O | Better suited for modern low-voltage, high-density designs; lacks mailbox registers and programmable flag offsets | Choose IDT72V2105L15PF when migrating to 3.3 V systems and requiring higher density over 36-bit width. |
| SN74ACT2227DW | 5 V supply, 2 × 256 × 9 FIFOs, no mailbox, no parity, 12 ns access | Higher depth but narrower width; simpler control interface without flag offset programming | Choose SN74ACT2227DW for cost-sensitive 5 V applications needing deeper buffering without advanced flow control features. |
Compared with IDT72V2105L15PF and SN74ACT2227DW, SN74ABT3612-30PCB uniquely delivers 36-bit width, mailbox bypass, and programmable flag thresholds in a 5 V BiCMOS package-making it optimal for legacy telecom and industrial backplanes requiring deterministic latency and robust error handling.
Availability
SN74ABT3612-30PCB is available at Aetrix Electronics and suitable for telecom line card design, industrial PLC data aggregation, PCI-to-local bus bridging, and medical imaging data pipeline applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT3612-30PCB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability interface and memory products.
The SN74ABT3612-30PCB belongs to TI's ABT logic family-designed specifically for high-speed, low-power bidirectional data buffering in multi-clock-domain systems such as telecom infrastructure and industrial automation controllers.
FAQ
What is the maximum supported clock frequency for SN74ABT3612-30PCB?
The SN74ABT3612-30PCB supports clock frequencies up to 67 MHz on both CLKA and CLKB inputs under industrial temperature conditions (0°C to 70°C). This rating is validated per the SCBS129G datasheet and reflects guaranteed timing margins for setup/hold and propagation delays in the BiCMOS process.
Does SN74ABT3612-30PCB support independent clock domains?
Yes, SN74ABT3612-30PCB explicitly supports asynchronous operation of CLKA and CLKB-its flags (EFA/FFA/AEA/AFA and EFB/FFB/AEB/AFB) are independently synchronized to their respective clocks using two-stage flip-flop chains, enabling reliable handshaking across unrelated clock domains.
How are the almost-full and almost-empty flag thresholds programmed on SN74ABT3612-30PCB?
The SN74ABT3612-30PCB uses FS0 and FS1 inputs, latched on the rising edge of RST, to select one of four preset offset values (4, 8, 12, or 16 words) for both AFA/AEA and AFB/AEB flags. This allows precise tuning of early flow control without firmware intervention.
What is the function of the mailbox registers in SN74ABT3612-30PCB?
SN74ABT3612-30PCB includes two 36-bit mailbox registers (mail1 and mail2) that allow immediate data transfer between Port-A and Port-B without FIFO queuing delay. MBA and MBB select mailbox access, while MBF1 and MBF2 provide hardware handshaking to prevent overwrite and ensure atomic delivery.
Can SN74ABT3612-30PCB perform parity generation and checking simultaneously on both ports?
Yes, SN74ABT3612-30PCB supports concurrent parity generation (via PGA/PGB) and checking (via PEFA/PEFB) on both ports. Parity is computed per 9-bit byte (A0–A8, etc.), with ODD/EVEN selecting mode, and the same parity trees serve both port inputs and mailbox outputs-ensuring consistent error detection across all data paths.
SN74ABT3612-30PCB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 120-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Size:
- 4.5K (64 x 36 x 2)
- Function:
- Synchronous
- Data Rate:
- 33.4MHz
- Access Time:
- 15ns
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Current - Supply (Max):
- 130mA
- Bus Directional:
- Bi-Directional
- Expansion Type:
- Width
- Programmable Flags Support:
- Yes
- Retransmit Capability:
- No
- FWFT Support:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 120-HLQFP (14x14)
SN74ABT3612-30PCB FAQ
1.How can I place an order for SN74ABT3612-30PCB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT3612-30PCB 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 SN74ABT3612-30PCB reliable?
The price and inventory of SN74ABT3612-30PCB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT3612-30PCB is usually 5 days.
3.What payment methods are accepted for SN74ABT3612-30PCB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT3612-30PCB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT3612-30PCB?
SN74ABT3612-30PCB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT3612-30PCB 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 SN74ABT3612-30PCB?
For technical support, including SN74ABT3612-30PCB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT3612-30PCB requirements.
6.How does Aetrix verify that SN74ABT3612-30PCB is sourced from the original manufacturer or authorized distributors?
All SN74ABT3612-30PCB 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 SN74ABT3612-30PCB meets industry standards.
7.What is the process for return or replacement of SN74ABT3612-30PCB?
All SN74ABT3612-30PCB units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT3612-30PCB, 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 SN74ABT3612-30PCB part is unused and in its original packaging.
Return procedure for SN74ABT3612-30PCB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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