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Texas Instruments CD74ACT646M96
- Part No.:
- CD74ACT646M96
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74ACT646M96.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,321
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Product details
Overview
CD74ACT646M96 from Texas Instruments is a high-speed 8-bit bidirectional transceiver with 3-state outputs and bus-hold circuitry, designed for data bus isolation and level translation in TTL-compatible digital systems. It operates from 4.5V to 5.5V, supports ±24mA output drive, features propagation delay of 8.5ns (typ) at VCC = 5V, and is rated for -55°C to +125°C operation - commonly used in industrial control backplanes and legacy microprocessor data buses.
For engineers reviewing the CD74ACT646M96 datasheet, CD74ACT646M96 pinout, CD74ACT646M96 application, or CD74ACT646M96 equivalent, key selection criteria include its ACT logic family speed-power trade-off, SOIC-24 package compatibility, bus-hold input retention, and 5V-only supply requirement versus mixed-voltage interface alternatives.
Technical Context
The CD74ACT646M96 implements dual 8-bit directional control (DIR) and output-enable (OE) logic to manage bidirectional data flow between two 8-bit buses. Its ACT-series CMOS design ensures TTL-compatible input thresholds and reduced dynamic power consumption compared to standard AC devices.
It integrates bus-hold circuitry on all inputs to maintain valid logic states when drivers are inactive, eliminating need for external pull-up/down resistors. The device does not support hot insertion or live insertion, and lacks internal ESD protection beyond standard HBM ratings per JEDEC JESD22-A114.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ACT (Advanced CMOS TTL-compatible), enabling direct replacement of 74LS/74F in 5V systems without level-shifting. |
| Supply Voltage | 4.5V to 5.5V - requires stable 5V rail; not suitable for 3.3V or mixed-supply domains without external translation. |
| Propagation Delay | 8.5ns (typ) at VCC = 5V, CL = 50pF - enables reliable operation up to ~80MHz bus toggle rates in controlled-impedance traces. |
| Output Drive | ±24mA (IOH/IOL) - sufficient to drive 10 LS-TTL loads or terminate short stubs on unterminated buses. |
| Operating Temperature | -55°C to +125°C - qualified for extended industrial and military-grade environments, not commercial-only use. |
| Input Bus-Hold | Integrated on all A/B-side inputs - maintains last-valid state during bus float, reducing BOM count and PCB space vs discrete resistors. |
Pinout & Package
CD74ACT646M96 is housed in a 24-pin SOIC (DW) package with 300-mil body width, gull-wing leads, and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Data inputs/outputs (Side A) | Bidirectional I/O port connected to local bus; direction controlled by DIR and OE signals. |
| B0–B7 | Data inputs/outputs (Side B) | Bidirectional I/O port connected to remote bus; electrically isolated from Side A when OE is high. |
| DIR | Direction control input | High = A→B transfer; Low = B→A transfer; asynchronous edge-sensitive control with no internal synchronization. |
| OE | Output enable input | Low = transceiver active; High = both A and B ports enter high-impedance state, enabling multi-drop bus sharing. |
| VCC | Positive supply | Must be decoupled locally with 0.1µF ceramic capacitor; noise margin degrades below 4.5V. |
| GND | Ground reference | Common return for all I/O and supply currents; requires low-inductance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2.0V min, VIL = 0.8V max - ensures interoperability with legacy 74LS, 74F, and microcontroller GPIOs without level shifters. |
| Bus-hold circuitry | Active on all 16 I/O pins - eliminates need for 16 external pull-up/down resistors, saving ~32 mm² PCB area and reducing assembly cost. |
| 3-state outputs | Output leakage < 10µA in high-Z mode - prevents unintended current paths when multiple transceivers share a common bus segment. |
| High noise immunity | Typical VNH = 0.7V, VNL = 0.6V at VCC = 5V - suppresses false triggering from EFT or radiated coupling in noisy industrial enclosures. |
| ACT speed-power balance | 8.5ns delay with 20µA ICC static current - delivers LS/F-class timing at <10% of bipolar power dissipation under typical loading. |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Data Bus |
|---|---|
Use Scenario: Isolating CPU address/data bus from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional data transceiver enabling read/write cycles between MPU and add-on I/O modules. Use Value: Bus-hold retains valid bus state during slot insertion/removal, preventing spurious writes during hot-swap sequences. |
Use Scenario: Interfacing Z80 or 8086-based systems with external memory banks using separate address latching. IC Role / Device Role / Timing Role: Direction-controlled data path between CPU D0–D7 and RAM/ROM data lines. Use Value: 8.5ns propagation delay meets 4MHz Z80 tDS/tDH setup/hold requirements without added wait states. |
| Test Equipment Signal Routing | Avionics Data Concentrator |
Use Scenario: Reconfigurable signal path switching in automated test equipment mainframes with modular instrument cards. IC Role / Device Role / Timing Role: Controlled bidirectional conduit for GPIB or IEEE-488 data lines between controller and instruments. Use Value: ±24mA drive strength sustains signal integrity across 2m ribbon cables with up to 5 instrument loads. |
Use Scenario: Aggregating ARINC 429 receiver outputs into a centralized avionics management unit in regional aircraft. IC Role / Device Role / Timing Role: Level-translating buffer between 5V ARINC receivers and 5V FPGA-based concentrator logic. Use Value: -55°C to +125°C rating satisfies DO-160 Section 22 Category C temperature testing for flight-critical hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT245N | Octal non-inverting transceiver only; no DIR pin - direction fixed by OE polarity and external wiring. | Lacks integrated direction control logic; requires additional gate logic for bidirectional flow management. | Prefer when bus direction is static or controlled externally; lower pin count but higher system-level complexity. |
| 74LVC245APW | 3.3V-only supply (1.65–3.6V); LVCMOS input thresholds; no bus-hold; 3.5ns delay at 3.3V. | Not 5V-tolerant; incompatible with TTL-level sources unless level-shifted; unsuitable for -55°C operation. | Select for modern low-voltage embedded systems where power efficiency and speed outweigh legacy compatibility needs. |
Compared with SN74ACT245N and 74LVC245APW, the CD74ACT646M96 uniquely combines 5V TTL compatibility, integrated DIR control, bus-hold, and extended temperature range - making it irreplaceable in legacy industrial and aerospace upgrades where signal integrity and drop-in fit are mandatory.
Availability
CD74ACT646M96 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy microprocessor data buses, and avionics data concentrators requiring stable component supply over extended product lifecycles.
Supply support for CD74ACT646M96 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 industry-standard logic families.
The CD74ACT646M96 belongs to TI's Advanced CMOS (ACT) logic portfolio, engineered specifically for high-reliability 5V digital systems demanding TTL compatibility, robust noise immunity, and extended temperature operation.
FAQ
What is the maximum clock frequency supported by CD74ACT646M96?
The CD74ACT646M96 is not a clocked device - it is an asynchronous transceiver with no internal clock. Its usable data rate depends on propagation delay (8.5ns typ) and system trace length. For clean edges on 50Ω traces, it reliably supports bidirectional bus toggling up to approximately 80MHz, assuming proper termination and layout practices. Always verify timing margins against your specific load and routing.
Does CD74ACT646M96 support hot-plug or live-insertion capability?
No, CD74ACT646M96 does not support hot-plug or live-insertion. It lacks internal power-up sequencing, I/O clamp diodes for voltage overshoot protection, or bus-fault detection. Applying signal or supply voltage before both VCC and GND are stable may cause latch-up or permanent damage. Power must be applied in strict sequence: GND first, then VCC, followed by signals.
Can CD74ACT646M96 operate with a 3.3V supply?
No, CD74ACT646M96 is specified only for 4.5V to 5.5V operation. At 3.3V, input thresholds become undefined, output drive collapses below TTL-compatible levels, and DC parameters fall outside guaranteed specs. Using it at 3.3V risks metastability, excessive propagation delay (>25ns), and potential bus contention - do not substitute for 3.3V logic families like LVC or AVC.
What is the purpose of the bus-hold feature on CD74ACT646M96?
The bus-hold feature on CD74ACT646M96 actively maintains the last-valid logic state on each input pin when no driver is asserting the line - preventing floating inputs that could cause oscillation or increased power draw. This eliminates the need for external pull-up or pull-down resistors on all 16 I/O lines, simplifying BOM and improving reliability in systems with intermittent bus activity.
Is CD74ACT646M96 pin-compatible with CD74AC646M96?
Yes, CD74ACT646M96 is pin-compatible and functionally identical to CD74AC646M96 in SOIC-24 (DW) packaging, differing only in logic family characteristics: ACT offers TTL-compatible inputs and faster speed (8.5ns vs 10.5ns), while AC has CMOS input thresholds and slightly lower drive (±24mA same). Both share identical pinout, package dimensions, and thermal profile.
CD74ACT646M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
CD74ACT646M96 FAQ
1.How can I place an order for CD74ACT646M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT646M96 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 CD74ACT646M96 reliable?
The price and inventory of CD74ACT646M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT646M96 is usually 5 days.
3.What payment methods are accepted for CD74ACT646M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT646M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT646M96?
CD74ACT646M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT646M96 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 CD74ACT646M96?
For technical support, including CD74ACT646M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT646M96 requirements.
6.How does Aetrix verify that CD74ACT646M96 is sourced from the original manufacturer or authorized distributors?
All CD74ACT646M96 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 CD74ACT646M96 meets industry standards.
7.What is the process for return or replacement of CD74ACT646M96?
All CD74ACT646M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT646M96, 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 CD74ACT646M96 part is unused and in its original packaging.
Return procedure for CD74ACT646M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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