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onsemi 74ABT652CMTCX
- Part No.:
- 74ABT652CMTCX
- Manufacturer:
- onsemi
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74ABT652CMTCX.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,751
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Product details
Overview
74ABT652CMTCX from Fairchild Semiconductor is an octal transceiver and register IC with independent A/B bus registers, 3-STATE outputs, and dual-clock control (CPAB/CPBA). It supports real-time or registered data transfer between 8-bit buses, delivers 64 mA sink / 32 mA source drive per output, and operates across −40°C to +85°C at 4.5–5.5 V. It is used in high-speed bus isolation and multiplexed data routing in industrial backplanes and legacy computing systems.
For engineers reviewing the 74ABT652CMTCX datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed simultaneous switching noise performance, 50 pF / 250 pF load-tested propagation delays, latchup protection, nondestructive hot insertion capability, and TSSOP-24 package compatibility with JEDEC MO-153 footprint.
Technical Context
The 74ABT652CMTCX implements dual D-type flip-flop registers per bus (A0–A7 and B0–B7), each clocked independently via CPAB (A→B) and CPBA (B→A). Select inputs SAB/SBA configure four operating modes: real-time A→B, real-time B→A, stored A→B, or stored B→A - enabling dynamic bus arbitration without external logic.
Output Enable pins OEAB and OEBA provide independent 3-STATE control for each direction, allowing bidirectional bus isolation. All outputs meet guaranteed skew specs (≤2.5 ns pin-to-pin under 250 pF load) and are rated for simultaneous switching of up to eight outputs with defined noise margins and dynamic threshold stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +4.5 V to +5.5 V - ensures compatibility with 5 V TTL/ABT logic families and stable operation across industrial temperature range. |
| Max Clock Frequency | 200 MHz - enables high-throughput data handshaking in synchronous bus architectures without timing violation. |
| Propagation Delay (CL = 50 pF) | 1.5–4.9 ns - guarantees sub-5 ns path timing for critical bus-to-bus or clock-to-bus transfers in real-time mode. |
| Output Drive Strength | 64 mA sink / 32 mA source - supports direct driving of heavy capacitive loads or multiple TTL inputs without buffers. |
| Pin-to-Pin Skew (250 pF) | ≤2.5 ns - ensures deterministic timing alignment across all eight outputs during parallel switching events. |
| Operating Temperature | −40°C to +85°C - validated for use in industrial control cabinets and telecom line cards without derating. |
| Input Voltage Thresholds | VIH = 2.0 V, VIL = 0.8 V - provides robust noise margin against ground bounce and supply ripple in noisy environments. |
Pinout & Package
74ABT652CMTCX is housed in a 24-lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153 compliant, 4.4 mm wide, with 0.65 mm lead pitch. The package supports fine-pitch PCB assembly and offers improved thermal dissipation over standard SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Data Register A Inputs / 3-STATE Outputs | Bidirectional I/O pins for Bus A; register-stored or real-time data appears on these pins when OEAB is active low. |
| B0–B7 | Data Register B Inputs / 3-STATE Outputs | Bidirectional I/O pins for Bus B; functionally symmetric to A0–A7 with independent enable and clock control. |
| CPAB | Register Clock Input (A→B) | Triggers storage of A-bus data into internal DFFs on LOW-to-HIGH transition; controls A→B registered transfer path. |
| CPBA | Register Clock Input (B→A) | Triggers storage of B-bus data into internal DFFs on LOW-to-HIGH transition; controls B→A registered transfer path. |
| SAB | Select Input (A→B Path) | Determines whether A→B transfer uses real-time or stored data; HIGH selects stored A data, LOW enables real-time pass-through. |
| SBA | Select Input (B→A Path) | Determines whether B→A transfer uses real-time or stored data; HIGH selects stored B data, LOW enables real-time pass-through. |
| OEAB | Output Enable (A→B Direction) | Active-low control: when LOW, enables A→B transceiver path; when HIGH, places A0–A7 in high-impedance state. |
| OEBA | Output Enable (B→A Direction) | Active-low control: when LOW, enables B→A transceiver path; when HIGH, places B0–B7 in high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| Independent A/B Registers | Enables asynchronous capture and retention of data on both buses - critical for handshake-free burst transfers and pipeline staging. |
| Multiplexed Real-Time & Stored Data | Allows dynamic switching between live bus signals and latched values using SAB/SBA, eliminating need for external multiplexers. |
| Guaranteed Simultaneous Switching Noise | Specified limits ensure signal integrity when all eight outputs switch concurrently - essential for EMI-sensitive industrial designs. |
| Nondestructive Hot Insertion | Permits safe board replacement in powered-backplane systems without damaging the 74ABT652CMTCX or connected peripherals. |
| High-Impedance Glitch-Free Power-Up | Outputs remain in defined 3-STATE during entire power ramp - prevents bus contention at system boot or brownout recovery. |
Applications
| Industrial Backplane Interfacing | Legacy Computing Bus Arbitration |
|---|---|
|
Use Scenario: Isolating and synchronizing data flow between CPU and I/O expansion slots in ruggedized PLC chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver with register hold capability acts as timing-isolated interface between mismatched clock domains. Use Value: Enables deterministic data capture from slow peripherals while maintaining high-speed CPU bus throughput via stored register mode. |
Use Scenario: Managing shared memory access between dual-processor modules in embedded VMEbus systems. IC Role / Device Role / Timing Role: Dual-register transceiver serves as programmable bus switch with independent A/B enable and select control. Use Value: Eliminates external glue logic by supporting real-time or registered read/write arbitration with sub-5 ns delay consistency. |
| Telecom Line Card Data Buffering | Test Equipment Signal Routing |
|
Use Scenario: Buffering and isolating control/status signals between FPGA-based controller and analog front-end ASICs on carrier-grade line cards. IC Role / Device Role / Timing Role: Registered transceiver provides glitch-free signal staging and ESD-robust 64 mA drive for long trace runs. Use Value: Guarantees latchup immunity and hot-swap safety during field-replaceable module insertion - reducing MTTR. |
Use Scenario: Reconfigurable signal path selection in automated test equipment (ATE) mainframes handling mixed-voltage DUT interfaces. IC Role / Device Role / Timing Role: Octal bidirectional buffer with independent OE and clock enables precise timing-controlled stimulus/response routing. Use Value: Supports deterministic setup/hold timing (≥1.5 ns) and 200 MHz clocking for high-speed digital pattern generation and capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT652N | 24-pin PDIP package; higher thermal resistance; no hot-insertion qualification; same AC/DC specs. | Preferred for prototyping or through-hole legacy systems where TSSOP reflow is unavailable. | Choose SN74ABT652N only if manual soldering or socket-based testing is required; not suitable for high-density surface-mount production. |
| 74FCT652CTSO24 | FCT-family variant: lower ICCZ (20 µA vs. 50 µA), faster tPZH/tPHZ (4.0 ns max), but reduced drive (64 mA sink only, no 32 mA source). | Better for ultra-low static power systems with single-direction dominant traffic; lacks full bidirectional sourcing capability. | Select 74FCT652CTSO24 when minimizing quiescent current is critical and asymmetric drive (sink-only) suffices for target bus loading. |
Compared with SN74ABT652N and 74FCT652CTSO24, the 74ABT652CMTCX uniquely combines TSSOP-24 compactness, verified nondestructive hot insertion, symmetrical 32 mA source/64 mA sink drive, and guaranteed 250 pF load timing - making it optimal for space-constrained, hot-pluggable industrial backplanes.
Availability
74ABT652CMTCX is available at Aetrix Electronics and suitable for industrial backplane interfacing, legacy computing bus arbitration, telecom line card buffering, and ATE signal routing requiring stable component supply and long-term lifecycle support.
Supply support for 74ABT652CMTCX 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
Fairchild Semiconductor was a U.S.-based designer of high-performance analog and logic ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and telecom infrastructure.
The 74ABT652CMTCX belongs to Fairchild's Advanced BiCMOS Transceiver (ABT) product line, engineered for high-speed, noise-immune bus interfacing in mission-critical industrial and communications equipment.
FAQ
What is the maximum capacitive load supported by the 74ABT652CMTCX while maintaining guaranteed timing?
The 74ABT652CMTCX is fully characterized for both 50 pF and 250 pF loads. Propagation delays, skew, and switching noise specifications are guaranteed up to 250 pF per output - enabling reliable operation with long traces, connectors, or fanout to multiple TTL inputs without timing margin loss. This is confirmed in the Extended AC Electrical Characteristics table on page 6 of the datasheet.
Does the 74ABT652CMTCX support hot insertion, and what design features enable this?
Yes, the 74ABT652CMTCX supports nondestructive hot insertion. Key enablers include high-impedance glitch-free behavior during power-up/down cycles, guaranteed latchup protection (±500 mA), and input voltage tolerance up to +7.0 V - all verified per Absolute Maximum Ratings and Functional Description sections. These features prevent damage or bus contention when inserted into a live backplane.
How does the 74ABT652CMTCX handle simultaneous switching of all eight outputs?
The 74ABT652CMTCX specifies guaranteed simultaneous switching noise levels and dynamic threshold performance for up to eight outputs toggling. Its architecture minimizes ground bounce and supply droop through balanced driver design and internal decoupling - ensuring signal integrity in dense bus environments. This is explicitly called out in the Features list and AC Electrical Characteristics tables.
What is the function of the SAB and SBA pins on the 74ABT652CMTCX?
SAB and SBA are select inputs that determine data source routing: SAB controls whether A→B transfer uses real-time bus data (SAB = LOW) or stored register data (SAB = HIGH); SBA performs the same function for B→A direction. Together with CPAB/CPBA clocks and OEAB/OEBA enables, they implement four distinct bus-management modes shown in Figure 1 of the datasheet.
Is the 74ABT652CMTCX pin-compatible with other packages in the same family?
Yes - the 74ABT652CMTCX shares identical pinout with 74ABT652CSC (SOIC) and 74ABT652CMSA (SSOP), as confirmed in the Pin Assignment diagrams and Pin Descriptions section. All three variants use the same 24-pin functional mapping, enabling drop-in replacement across package types without PCB redesign.
74ABT652CMTCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ABT
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TSSOP
74ABT652CMTCX FAQ
1.How can I place an order for 74ABT652CMTCX through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT652CMTCX 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 74ABT652CMTCX reliable?
The price and inventory of 74ABT652CMTCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT652CMTCX is usually 5 days.
3.What payment methods are accepted for 74ABT652CMTCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT652CMTCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT652CMTCX?
74ABT652CMTCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT652CMTCX 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 74ABT652CMTCX?
For technical support, including 74ABT652CMTCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT652CMTCX requirements.
6.How does Aetrix verify that 74ABT652CMTCX is sourced from the original manufacturer or authorized distributors?
All 74ABT652CMTCX 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 74ABT652CMTCX meets industry standards.
7.What is the process for return or replacement of 74ABT652CMTCX?
All 74ABT652CMTCX units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT652CMTCX, 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 74ABT652CMTCX part is unused and in its original packaging.
Return procedure for 74ABT652CMTCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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