My Inquiry
My Account
Renesas 74FCT2245ATSOG
- Part No.:
- 74FCT2245ATSOG
- Manufacturer:
- Renesas
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74FCT2245ATSOG.pdf
- Description:
- IC TXRX NON-INVERT 5.25V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,073
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74FCT2245ATSOG from Renesas Electronics (formerly IDT) is a fast CMOS octal bidirectional transceiver in SOIC-20 package, operating at 5V with industrial temperature range (–40°C to +85°C). It features true TTL-compatible I/O (VOH = 3.3V typ., VOL = 0.3V typ.), ±15mA output drive, and 3-state control via OE and T/R pins for asynchronous bus interfacing.
For engineers reviewing the 74FCT2245ATSOG datasheet, 74FCT2245ATSOG pinout, 74FCT2245ATSOG application, or 74FCT2245ATSOG equivalent, key selection criteria include bidirectional data flow direction control, low ground bounce due to built-in current-limiting resistors, high-impedance isolation during disable, and compatibility with legacy FCT245T designs.
Technical Context
The 74FCT2245ATSOG implements asynchronous bidirectional data transfer between two 8-bit buses using dual-control logic: OE (active-low) enables/disables both A and B ports globally, while T/R (active-high transmit) selects direction - A→B when high, B→A when low. Its advanced dual-metal CMOS process ensures CMOS power efficiency with TTL-level interface robustness.
It delivers balanced drive strength (–15mA IOH, 12mA IOL), controlled output fall times, and reduced system switching noise - eliminating need for external series termination resistors. The device meets JEDEC Standard 18 and supports plug-in replacement of 74FCT245T in existing layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 5.0V ±5% - fixed single-rail operation compatible with legacy 5V TTL/CMOS systems |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating |
| IOH / IOL | –15mA / 12mA - sufficient drive for unterminated stubs and moderate fanout without external buffers |
| tPLH / tPHL | 1.5ns min / 4.6ns max - sub-5ns propagation enables high-speed bus bridging up to ~200MHz toggle rate |
| CIN / COUT | 6–10pF / 8–12pF - low capacitive loading minimizes signal integrity impact on source and load buses |
| ICC Quiescent | 1mA max - ultra-low static power ideal for always-on bus isolation in power-sensitive systems |
| VIH / VIL | 2.0V min / 0.8V max - guaranteed recognition of standard TTL logic levels across full temperature range |
Pinout & Package
74FCT2245ATSOG is housed in a 20-pin Small Outline IC (SOIC) package with green RoHS-compliant finish (SOG suffix), measuring 12.8mm × 7.5mm × 2.65mm, standard pitch 1.27mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Disables both A and B ports simultaneously into high-Z state; critical for bus arbitration and multi-driver contention avoidance |
| 2 (T/R) | Transmit/receive direction control | High = A→B data flow; Low = B→A; enables dynamic bus reversal without reconfiguration logic |
| 3–10 (A0–A7) | Side-A bidirectional I/O | Connects to local bus; functions as input or 3-state output depending on T/R and OE states |
| 11 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-inductance connection to minimize ground bounce |
| 12–19 (B0–B7) | Side-B bidirectional I/O | Connects to remote bus; mirrors A-side behavior with opposite directionality under T/R control |
| 20 (VCC) | Power supply | 5V supply rail; requires local 0.1μF ceramic decoupling adjacent to pin to suppress switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Resistor-limited outputs | Integrated current-limiting resistors reduce ground bounce and undershoot, enabling direct connection to unterminated traces |
| TTL-compatible I/O | Guaranteed VOH ≥2.4V at –15mA and VOL ≤0.5V at 12mA ensures interoperability with legacy 5V logic families |
| JEDEC Std 18 compliance | Fully conforms to industry-standard timing, voltage, and reliability requirements for commercial and industrial logic devices |
| Plug-in FCT245T replacement | Identical pinout and function allow drop-in upgrade from 74FCT245T with improved noise immunity and drive capability |
| Low leakage | ≤1μA max input/output leakage over temperature ensures reliable high-Z state retention in battery-backed or standby modes |
Applications
| Industrial PLC Backplane Interface | Legacy CPU-to-Peripheral Bridge |
|---|---|
Use Scenario: Isolating and translating data between microcontroller bus and modular I/O expansion cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver managing asynchronous read/write cycles between CPU and fieldbus peripherals. Use Value: Enables hot-swappable module support via precise 3-state control and eliminates bus contention during card insertion/removal. | Use Scenario: Interfacing an 8051-based controller with parallel EEPROM, LCD, or keypad peripherals sharing a common address/data bus. IC Role / Device Role / Timing Role: Direction-controlled bus extender allowing same physical bus lines to serve dual read/write roles without external multiplexers. Use Value: Reduces PCB layer count and component count by replacing discrete bus switches or dual unidirectional drivers. |
| Test Equipment Bus Arbitration | Automated Test Fixture Data Link |
Use Scenario: Managing shared GPIB or custom parallel test bus among multiple instruments and DUT interfaces in ATE systems. IC Role / Device Role / Timing Role: Contention-free bidirectional data coupler synchronized to master sequencer signals (OE/T/R). Use Value: Guarantees deterministic bus ownership transitions with sub-5ns propagation, preventing metastability in high-throughput test sequences. | Use Scenario: Connecting FPGA-based pattern generator to DUT's parallel test port while supporting both stimulus injection and response capture. IC Role / Device Role / Timing Role: Reversible data pipeline with independent enable/disable control per test phase (setup, drive, sample). Use Value: Eliminates need for separate TX/RX transceivers and simplifies test firmware by unifying bus control logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74FCT2245CTQG | Same core logic and specs, but in QSOP-20 package (4.4mm width vs SOIC-20's 7.5mm); slightly higher thermal resistance | Better suited for space-constrained boards where footprint area is prioritized over thermal margin | Select when board real estate is limited and thermal load remains low; verify trace width and copper pour for heat dissipation |
| SN74F245N | Older bipolar F-series; higher ICC (30mA typ.), slower tPLH/tPHL (10ns max), no integrated current-limiting resistors | Requires external termination and generates more ground bounce; suitable only for legacy redesigns with strict form-factor constraints | Choose only if backward compatibility with obsolete F245 layouts is mandatory; expect higher power and noise penalties |
Compared with 74FCT2245CTQG and SN74F245N, the 74FCT2245ATSOG offers optimal balance of speed, noise control, and industrial reliability in standard SOIC packaging - making it preferred for new designs requiring robust 5V bus interfacing without layout compromise.
Availability
74FCT2245ATSOG is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy CPU peripheral bridges, automated test equipment bus arbitration, and FPGA-based test fixture data links requiring stable component supply and long-term lifecycle support.
Supply support for 74FCT2245ATSOG 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
Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.
The 74FCT2245ATSOG belongs to Renesas' legacy IDT fast CMOS logic family, engineered specifically for high-reliability 5V bus interfacing in industrial control and test instrumentation where noise immunity, timing precision, and drop-in upgrade paths matter.
FAQ
What is the maximum clock frequency supported by the 74FCT2245ATSOG for reliable data transfer?
The 74FCT2245ATSOG does not operate on a clock - it is an asynchronous transceiver. Its 4.6ns max propagation delay (tPLH/tPHL) supports reliable data toggling up to approximately 200MHz under typical 50pF load conditions. System-level timing depends on bus capacitance, drive strength, and layout; actual usable frequency must be validated per application with worst-case setup/hold margins. The 74FCT2245ATSOG datasheet specifies no clock parameter because it lacks internal timing elements.
Does the 74FCT2245ATSOG support mixed-voltage operation between A and B sides?
No, the 74FCT2245ATSOG operates exclusively at a single 5V supply (VCC = 5.0V ±5%) and does not support mixed-voltage translation. Both A and B ports share the same VCC rail and exhibit TTL-compatible thresholds referenced to that supply. For level-shifting between different voltage domains, a dedicated level translator such as the TXB0108 or 74AVCH series is required instead of the 74FCT2245ATSOG.
Can the 74FCT2245ATSOG be used with 3.3V logic systems?
The 74FCT2245ATSOG is not rated for 3.3V operation: its absolute maximum VCC is 5.5V, minimum is 4.5V, and VIH/VIL thresholds are defined for 5V systems. Driving its inputs with 3.3V logic may result in marginal or non-functional HIGH recognition (VIH min = 2.0V, but margin shrinks at temperature extremes). To interface with 3.3V systems, use a 3.3V-compatible transceiver like the 74LVC245A or add a level-shifter - the 74FCT2245ATSOG itself must be powered at 5V.
What is the purpose of the current-limiting resistors inside the 74FCT2245ATSOG?
The integrated current-limiting resistors in the 74FCT2245ATSOG reduce ground bounce and output undershoot by controlling edge slew rates and limiting peak output current during switching. This design eliminates the need for external series termination resistors on PCB traces, simplifies layout, and improves signal integrity in noisy industrial environments. These resistors are intrinsic to the output driver structure and are not user-configurable - they define the –15mA/12mA drive capability of the 74FCT2245ATSOG.
Is the 74FCT2245ATSOG pin-compatible with the 74FCT245T series?
Yes, the 74FCT2245ATSOG is explicitly documented as a plug-in replacement for the 74FCT245T series, sharing identical pinout, function, and electrical specifications. Both devices use the same SOIC-20 or QSOP-20 packages and support identical OE/T/R control logic. The 74FCT2245ATSOG improves upon the 74FCT245T with enhanced noise immunity and tighter timing, making it a direct drop-in upgrade without PCB changes.
74FCT2245ATSOG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74FCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 15mA, 12mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
74FCT2245ATSOG FAQ
1.How can I place an order for 74FCT2245ATSOG through Aetrix?
Please submit a Request for Quotation (RFQ) for 74FCT2245ATSOG 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 74FCT2245ATSOG reliable?
The price and inventory of 74FCT2245ATSOG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74FCT2245ATSOG is usually 5 days.
3.What payment methods are accepted for 74FCT2245ATSOG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74FCT2245ATSOG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74FCT2245ATSOG?
74FCT2245ATSOG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74FCT2245ATSOG 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 74FCT2245ATSOG?
For technical support, including 74FCT2245ATSOG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74FCT2245ATSOG requirements.
6.How does Aetrix verify that 74FCT2245ATSOG is sourced from the original manufacturer or authorized distributors?
All 74FCT2245ATSOG 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 74FCT2245ATSOG meets industry standards.
7.What is the process for return or replacement of 74FCT2245ATSOG?
All 74FCT2245ATSOG units undergo pre-shipment inspection (PSI). If there is an issue with 74FCT2245ATSOG, 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 74FCT2245ATSOG part is unused and in its original packaging.
Return procedure for 74FCT2245ATSOG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74FCT2245ATSOG Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
