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Texas Instruments SN74BCT623N
- Part No.:
- SN74BCT623N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74BCT623N.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,134
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Product details
Overview
SN74BCT623N from Texas Instruments is a 16-bit dual-supply bus transceiver with independent A-to-B and B-to-A data paths, 5-V supply operation, ±128-mA output drive capability on B port, and true (non-inverted) data transmission for asynchronous bus interfacing in industrial control backplanes.
For engineers reviewing the SN74BCT623N datasheet, SN74BCT623N pinout, SN74BCT623N application, or SN74BCT623N equivalent, this device supports bidirectional data isolation, simultaneous bus storage via dual-OE activation, and high-current TTL-compatible I/O for legacy system upgrades requiring robust noise immunity and low ICCZ quiescent current.
Technical Context
The SN74BCT623N implements BiCMOS logic to achieve TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V), rail-to-rail output swing (VOH ≥ 2.4 V at IOH = −3 mA on A port), and asymmetric drive strength-128 mA sink capability on B-port outputs versus 24 mA on A-port outputs-enabling asymmetric bus loading management.
Its dual-output-enable architecture (OEAB and OEBA) enables four distinct operational modes per function table: A→B transmission, B→A transmission, full isolation, and transparent latch mode where both OEs active hold bus states without external feedback, leveraging internal output reinforcement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage (VCC) | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Operating temperature | 0°C to 70°C - qualified for commercial-grade industrial and computing equipment environments. |
| B-port low-level output current (IOL) | 64 mA - supports driving heavy capacitive loads or multiple TTL inputs on shared backplane buses. |
| A-port high-level output current (IOH) | −3 mA - sufficient for light-load CMOS fanout while minimizing power during high-state assertion. |
| Propagation delay (A→B, tPHL) | 7.4 ns max at VCC = 4.5–5.5 V - enables reliable timing in sub-10-ns synchronous bus cycles. |
| Quiescent supply current (ICCZ) | 11 mA max - significantly reduced vs. bipolar-only equivalents, lowering standby power in always-on systems. |
| ESD protection | >2000 V per MIL-STD-883C Method 3015 - provides robust handling margin during board assembly and field service. |
Pinout & Package
SN74BCT623N uses a 20-pin plastic DIP (dual in-line package) with 300-mil body width and through-hole mounting. Pin 10 is GND; Pin 20 is VCC. The package complies with JEDEC MS-001 and supports wave or hand soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OEAB) | Output enable A→B | Active-low control enabling data flow from A-bus inputs to B-bus outputs; high disables A→B path. |
| 2–9 (A1–A8) | A-side data inputs/outputs | Bidirectional I/O pins for first 8-bit bus segment; driven by internal BiCMOS buffers with TTL-compatible thresholds. |
| 10 (GND) | Ground reference | Primary return path for all internal logic and output currents; requires low-impedance PCB connection. |
| 11 (VCC) | Positive supply | 5-V DC supply input; decoupling capacitor (0.1 µF ceramic) required within 1 cm of this pin. |
| 12–19 (B1–B8) | B-side data inputs/outputs | Bidirectional I/O pins for second 8-bit bus segment; rated for 64-mA sink current per pin. |
| 20 (OEBA) | Output enable B→A | Active-low control enabling data flow from B-bus inputs to A-bus outputs; high disables B→A path. |
Key Features
| Feature | Design Value |
|---|---|
| True (non-inverting) data path | Eliminates need for external inversion logic when mirroring bus states across isolated domains. |
| Dual independent OE controls | Enables selective directionality, full isolation, or simultaneous bus latching without external glue logic. |
| BiCMOS process technology | Reduces ICCZ quiescent current by >50% vs. legacy bipolar 74BCT devices while retaining TTL drive strength. |
| Asymmetric output drive | B-port delivers 64 mA sink vs. A-port's 24 mA-optimized for driving heavier downstream loads on one side. |
| MIL-STD-883C ESD rating | Exceeds 2000 V HBM-reduces risk of field failure during handling or hot-plug events in industrial enclosures. |
Applications
| Industrial Backplane Interfacing | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Connecting microcontroller local bus to distributed I/O module backplane in PLC rack systems. IC Role / Device Role / Timing Role: Bidirectional level-consistent bus transceiver managing asynchronous data bursts between CPU and remote terminal units. Use Value: 64-mA B-port drive sustains signal integrity over 30-cm ribbon cables; dual-OE allows CPU-initiated read/write arbitration without added logic. |
Use Scenario: Extending ISA or STD bus segments in retro-computing test equipment with mixed-vendor peripherals. IC Role / Device Role / Timing Role: Isolation and direction control element enabling hot-swap-capable peripheral slots with state retention. Use Value: Simultaneous OEAB/OEBA activation holds last bus state during card insertion/removal, preventing glitches on shared address/data lines. |
| Automated Test Equipment (ATE) Signal Routing | Embedded Controller Debug Interface |
|
Use Scenario: Multiplexing DUT (device under test) parallel data ports to shared acquisition FPGA in modular ATE chassis. IC Role / Device Role / Timing Role: Directionally configurable data conduit supporting programmable signal path selection via control software. Use Value: Sub-8-ns propagation delay ensures deterministic timing alignment across 16-bit wide test vectors; low ICCZ minimizes thermal drift in dense test head layouts. |
Use Scenario: Bridging JTAG boundary-scan chain to processor debug port in safety-critical avionics modules. IC Role / Device Role / Timing Role: Isolating debug interface from main system bus during normal operation, then enabling secure access on demand. Use Value: Independent OEAB/OEBA permits strict physical separation-debug signals only enabled when both controls are asserted, preventing accidental exposure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT623N | AC-family CMOS; 5-V only; lower ICCZ (2 µA), but reduced output drive (24 mA sink on all ports). | Suitable for low-power, low-noise digital systems-not for driving heavy TTL loads or long traces. | Select when power efficiency and noise margin outweigh drive strength requirements. |
| SN74LS623N | Bipolar TTL; higher ICCZ (30 mA), slower propagation (15 ns max), no BiCMOS ESD enhancement. | Compatible with legacy LS-based designs but lacks modern reliability and thermal performance. | Choose only for exact form-fit-function replacement in obsolete LS-system repairs. |
Compared with SN74ACT623N and SN74LS623N, the SN74BCT623N uniquely balances high-current drive (64 mA), low quiescent current (11 mA), and MIL-grade ESD protection-making it optimal for industrial backplanes where signal integrity, power, and ruggedness coexist.
Availability
SN74BCT623N is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system bus extensions, automated test equipment signal routing, and embedded controller debug interfaces requiring stable component supply across extended product lifecycles.
Supply support for SN74BCT623N 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74BCT623N belongs to TI's 74BCT logic family-designed specifically for high-speed, high-drive bidirectional bus interfacing in commercial-grade systems where TTL compatibility, noise immunity, and power efficiency are jointly critical.
FAQ
What is the maximum operating temperature range for the SN74BCT623N?
The SN74BCT623N is characterized for operation from 0°C to 70°C, meeting commercial-grade environmental specifications. This range supports deployment in enclosed industrial cabinets, office automation equipment, and non-extended-temperature computing platforms. It is not rated for extended temperature operation like the military-grade SN54BCT623 variant.
Does the SN74BCT623N support true bidirectional data flow without external direction control logic?
Yes-the SN74BCT623N integrates two independent active-low output-enable inputs (OEAB and OEBA) that directly configure directionality: OEAB low enables A→B, OEBA low enables B→A, both low enables concurrent bidirectional flow, and both high isolates both buses. No external direction line or control IC is needed.
Can the SN74BCT623N be used with 3.3-V logic systems?
No-the SN74BCT623N requires a 4.5-V to 5.5-V supply and features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). Its inputs are not 3.3-V tolerant, and its outputs swing rail-to-rail near 5 V; interfacing with 3.3-V systems requires level-shifting circuitry or a different logic family such as the SN74AVC series.
What is the purpose of the dual-OE configuration when both OEAB and OEBA are asserted low on the SN74BCT623N?
When both OEAB and OEBA are low, the SN74BCT623N enters transparent latch mode: each output reinforces its corresponding input, holding the last valid logic state on both A and B buses-even if all upstream drivers go high-impedance. This behavior enables glitch-free bus state retention during reconfiguration or hot-swap events.
Is the SN74BCT623N RoHS compliant and lead-free?
Yes-the SN74BCT623N is manufactured with Pb-Free (RoHS-compliant) CU NIPDAU terminations and meets EU Directive 2011/65/EU requirements. Its packaging documentation confirms "Pb-Free (RoHS)" eco-plan status, and it is suitable for lead-free reflow processes per JEDEC J-STD-020.
SN74BCT623N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74BCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- 3mA, 24mA; 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74BCT623N FAQ
1.How can I place an order for SN74BCT623N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT623N 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 SN74BCT623N reliable?
The price and inventory of SN74BCT623N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT623N is usually 5 days.
3.What payment methods are accepted for SN74BCT623N?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74BCT623N?
SN74BCT623N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT623N 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 SN74BCT623N?
For technical support, including SN74BCT623N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT623N requirements.
6.How does Aetrix verify that SN74BCT623N is sourced from the original manufacturer or authorized distributors?
All SN74BCT623N 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 SN74BCT623N meets industry standards.
7.What is the process for return or replacement of SN74BCT623N?
All SN74BCT623N units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT623N, 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 SN74BCT623N part is unused and in its original packaging.
Return procedure for SN74BCT623N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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