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Texas Instruments SN74F2245DWR
- Part No.:
- SN74F2245DWR
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74F2245DWR.pdf
- Description:
- BUS TRANSCEIVER
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Inventory:21,000
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Product details
Overview
SN74F2245DWR from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for bidirectional asynchronous data transfer between two 8-bit buses (A↔B) in TTL-level systems. It features direction control (DIR), output enable (OE), 12 mA sink capability per output, integrated 25-Ω series resistors to suppress overshoot/undershoot, and operates over 0°C to 70°C.
For engineers reviewing the SN74F2245DWR datasheet, SN74F2245DWR pinout, SN74F2245DWR application, or SN74F2245DWR equivalent, key selection criteria include bidirectional bus isolation timing (tPLH/tPHL ≤ 6.6 ns), 3-state control logic compatibility, 5 V supply operation, and SOIC-20 package footprint suitability for legacy board upgrades and industrial backplane interfaces.
Technical Context
The SN74F2245DWR implements dual 8-bit bidirectional data paths controlled by a single DIR input: low DIR enables B→A transmission, high DIR enables A→B transmission. OE independently disables both A and B ports into high-impedance states, providing full bus isolation.
Each I/O port supports TTL-compatible voltage thresholds (VIL = 0.8 V, VIH = 2 V), delivers VOH ≥ 2.4 V at IOH = −3 mA, and sinks IOL = 12 mA with VOL ≤ 0.75 V. Internal 25-Ω series resistors on all outputs reduce signal integrity issues in unterminated stubs or long traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures robust operation across standard TTL power rail tolerances. |
| Propagation Delay (tPLH/tPHL) | ≤ 6.6 ns at VCC = 4.5–5.5 V, CL = 50 pF - Supports >150 MHz bus toggle rates in point-to-point configurations. |
| Output Drive (IOL) | 12 mA sink per pin - Drives standard TTL loads and multiple 74F inputs without external buffers. |
| 3-State Enable/Disable Time | tPZH/tPLZ ≤ 7.5 ns, tPZL/tPLZ ≤ 12 ns - Enables fast bus arbitration and dynamic bus sharing. |
| Operating Temperature | 0°C to 70°C - Qualified for commercial-grade embedded control and computing applications. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Matches standard TTL logic families for seamless interoperation. |
| Output Series Resistance | 25 Ω integrated per output - Reduces ringing and EMI on PCB traces up to 10 cm without external termination. |
Pinout & Package
SN74F2245DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm lead pitch, 2.65 mm max height, JEDEC MS-013 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: LOW = B→A, HIGH = A→B; TTL-compatible input with IIH/IIL ≤ ±0.5 mA. |
| 2–9 | A1–A8 | 8-bit bidirectional data port A; 3-state when OE = HIGH or DIR conflict invalidates path. |
| 10 | GND | Ground reference for all logic and output stages; requires low-inductance connection to minimize noise. |
| 11–18 | B1–B8 | 8-bit bidirectional data port B; electrically identical to A-port with same drive/sink specs. |
| 19 | OE | Output enable: LOW = active, HIGH = 3-state isolation of both A and B ports simultaneously. |
| 20 | VCC | +5 V supply; bypass capacitor (0.1 µF ceramic) required within 10 mm of pin for switching stability. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional 8-bit bus interface | Single DIR pin configures data flow direction (A↔B), eliminating need for separate transmit/receive control logic. |
| Integrated 25-Ω series output resistors | Reduces edge-induced overshoot/undershoot on PCB traces, enabling reliable operation without discrete termination. |
| 12 mA output sink capability | Drives up to 10 standard 74F TTL inputs or one 74AS input per pin, supporting fanout-critical backplane designs. |
| Fast 3-state enable/disable | tPZH ≤ 7.5 ns ensures minimal bus contention window during direction or enable transitions. |
| TTL-compatible input thresholds | VIL = 0.8 V / VIH = 2.0 V guarantees interoperability with legacy 74LS, 74F, and microcontroller GPIOs. |
Applications
| Memory Address Buffering | Legacy CPU Bus Interface |
|---|---|
|
Use Scenario: Isolating and driving 8-bit address latches between a microprocessor and dual-bank memory modules. IC Role / Device Role / Timing Role: Bidirectional address bus transceiver that buffers and direction-controls address signals during read/write cycles. Use Value: Prevents address bus contention during memory bank switching while maintaining sub-7 ns propagation delay for timing-critical access. |
Use Scenario: Interfacing an 8086/8088 CPU data bus to peripheral controllers with independent direction requirements. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled data path between CPU D0–D7 and peripheral data registers. Use Value: Eliminates discrete direction logic and pull-up networks, reducing component count and layout complexity in ISA-style designs. |
| Industrial Backplane Data Routing | Test Equipment Signal Switching |
|
Use Scenario: Routing sensor data between modular I/O cards and a central controller across a 10 cm backplane trace. IC Role / Device Role / Timing Role: Stub-tolerant bidirectional bus driver with integrated series termination for impedance-matched signaling. Use Value: 25-Ω internal resistors suppress reflections on uncontrolled-impedance backplanes, improving signal integrity without added BOM cost. |
Use Scenario: Configurable signal path switching in automated test equipment where DUT interface direction changes per test step. IC Role / Device Role / Timing Role: Reconfigurable 8-bit data channel enabling programmable stimulus/response routing via DIR/OE control. Use Value: Enables single hardware path to serve as both stimulus source and response capture channel, reducing relay count and test head complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS2245N | Lower IOL (8 mA), higher VOL (0.8 V), slower tPLH (10 ns), same pinout and function. | Higher static power (ICC ≈ 110 mA vs. 90 mA), less suitable for high-speed or low-noise environments. | Acceptable for cost-sensitive, lower-speed legacy replacements where timing margin exists. |
| SN74ACT245DW | CMOS input thresholds (VIH = 3.5 V), wider VCC range (4.5–5.5 V), same 24 mA IOL, faster tPLH (5.5 ns). | Not TTL-input compatible; requires level translation if driven by 74F/74LS sources. | Preferred for new designs needing lower ICC and better noise immunity, but requires input voltage validation. |
Compared with SN74ALS2245N and SN74ACT245DW, the SN74F2245DWR offers optimal balance of TTL compatibility, 12 mA drive, sub-7 ns timing, and integrated termination-making it the most direct fit for upgrading existing 74F-based bus architectures without redesign.
Availability
SN74F2245DWR is available at Aetrix Electronics and suitable for industrial control backplanes, legacy CPU bus extensions, and memory subsystem buffering requiring stable component supply amid obsolescence challenges.
Supply support for SN74F2245DWR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial and automotive qualification.
The SN74F2245DWR belongs to TI's 74F logic family-designed specifically for high-speed, low-power TTL-compatible digital interfacing in computing, instrumentation, and control systems.
FAQ
What is the maximum clock/data toggle rate supported by the SN74F2245DWR?
The SN74F2245DWR does not operate on a clock; it is an asynchronous transceiver. Its 6.6 ns maximum propagation delay (tPLH/tPHL) supports reliable data toggling up to approximately 150 MHz in point-to-point configurations with 50 pF load. System-level timing depends on bus capacitance, trace length, and driver strength-designers should verify setup/hold margins using the 2.1 ns minimum tPLH at VCC = 4.5 V and TA = min.
Can the SN74F2245DWR be used with 3.3 V logic systems?
No-the SN74F2245DWR is specified only for 4.5 V to 5.5 V VCC operation and TTL input thresholds (VIH = 2.0 V, VIL = 0.8 V). Driving its inputs from 3.3 V logic may result in marginal or non-functional VIH margin, and powering it at 3.3 V violates absolute maximum ratings. For 3.3 V systems, consider the SN74LVC245A or SN74AVC245 instead.
Does the SN74F2245DWR require external pull-up or pull-down resistors on DIR or OE?
No-DIR and OE are TTL-compatible CMOS inputs with IIH ≤ 20 μA and IIL ≤ −0.5 mA at VCC = 5.5 V. They can be directly driven by 74F, 74LS, or microcontroller GPIOs. Pull-ups are unnecessary unless floating-state prevention is required in system-level power sequencing; in such cases, 10 kΩ to VCC suffices.
What is the purpose of the 25-Ω resistors inside the SN74F2245DWR outputs?
The 25-Ω series resistors integrated into each output stage of the SN74F2245DWR dampen signal edge reflections on PCB traces, reducing overshoot and undershoot in unterminated or stub-loaded bus topologies. This improves signal integrity without requiring external resistors-particularly valuable in backplane or multi-drop layouts where trace impedance control is impractical.
Is the SN74F2245DWR pin-compatible with other 20-pin octal transceivers like the 74F245?
Yes-the SN74F2245DWR shares identical pinout, function mapping, and electrical behavior with the industry-standard SN74F245, including DIR (pin 1), OE (pin 19), A1–A8 (pins 2–9), B1–B8 (pins 11–18), VCC (pin 20), and GND (pin 10). It is a functional and mechanical drop-in replacement for SN74F245 in SOIC-20 (DW) packages.
SN74F2245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
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- Qualification:
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SN74F2245DWR FAQ
1.How can I place an order for SN74F2245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F2245DWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74F2245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F2245DWR is usually 5 days.
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5.How can I obtain technical support or documentation for SN74F2245DWR?
For technical support, including SN74F2245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F2245DWR requirements.
6.How does Aetrix verify that SN74F2245DWR is sourced from the original manufacturer or authorized distributors?
All SN74F2245DWR 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 SN74F2245DWR meets industry standards.
7.What is the process for return or replacement of SN74F2245DWR?
All SN74F2245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74F2245DWR, 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 SN74F2245DWR part is unused and in its original packaging.
Return procedure for SN74F2245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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