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Texas Instruments SN74HC623DWRG4
- Part No.:
- SN74HC623DWRG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74HC623DWRG4.pdf
- Description:
- IC TXRX NON-INVERT 6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,146
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Product details
Overview
SN74HC623DWRG4 from Texas Instruments is an octal bus transceiver IC designed for asynchronous two-way data communication between parallel buses in digital systems. It features dual 3-state outputs (A↔B), wide 2 V to 6 V supply operation, ±6-mA output drive at 5 V, typical propagation delay of 8 ns, and low 80-µA max ICC. It enables bidirectional bus isolation and lock-bus-latch functionality in industrial control backplanes and legacy system interconnects.
For engineers reviewing the SN74HC623DWRG4 datasheet, SN74HC623DWRG4 pinout, SN74HC623DWRG4 application, or SN74HC623DWRG4 equivalent, key selection criteria include dual-enable timing control (OEAB/OEBA), true logic compatibility with HC-family systems, 20-pin SOIC-DW package thermal performance (θJA = 58°C/W), and verified 15-LSTTL load drive capability under real-world bus loading conditions.
Technical Context
The SN74HC623DWRG4 implements a dual-directional 8-bit transceiver architecture with independent output-enable controls (OEAB and OEBA) that determine data flow direction (A→B, B→A) or high-impedance isolation. Its CMOS design ensures rail-to-rail input thresholds and true logic behavior across the full 2–6 V operating range.
When both OEAB and OEBA are asserted low, the device enters lock-bus-latch mode: each output reinforces its corresponding input, maintaining prior bus states on all 16 lines (A1–A8 and B1–B8) as long as external drivers remain high-Z. This eliminates need for external latches in hold-and-transfer applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing (e.g., 3.3 V A-bus ↔ 5 V B-bus) without level shifters. |
| Propagation Delay (tpd) | 8 ns typ @ VCC = 6 V, CL = 50 pF - enables reliable operation in sub-100 MHz synchronous bus handshaking. |
| Output Drive Strength | ±6 mA @ 5 V - directly drives up to 15 LSTTL loads, eliminating buffer stages in legacy TTL-to-CMOS bridging. |
| Quiescent Current (ICC) | 80 µA max @ VCC = 6 V - suitable for low-power standby modes in battery-backed or energy-conscious systems. |
| Input Leakage Current | ±1 µA max - ensures stable logic levels even with high-impedance pull-ups or floating control lines. |
| Enable/Disable Time (ten/tdis) | 20 ns max @ VCC = 6 V - guarantees clean bus arbitration with minimal glitch window during direction switching. |
| Power Dissipation Capacitance | 40 pF per transceiver - enables accurate dynamic power estimation for thermal design in dense PCB layouts. |
Pinout & Package
SN74HC623DWRG4 is housed in a 20-pin SOIC (DW) package with 0.300-inch body width, 1.27 mm pitch, and maximum height of 2.65 mm. The package meets JEDEC MS-013 and is RoHS-compliant with NIPDAU lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OEAB (Output Enable A→B) | Active-low control: enables A-bus data transmission to B-bus when low; disables A outputs to high-Z when high. |
| 2–9 | A1–A8 | Input/output terminals for A-side 8-bit bus; bidirectional with 3-state control via OEAB/OEBA. |
| 10 | GND | Ground reference for all internal circuitry and I/O buffers. |
| 11 | VCC | Positive supply rail (2–6 V); powers all logic and output stages. |
| 12 | OEBA (Output Enable B→A) | Active-low control: enables B-bus data transmission to A-bus when low; disables B outputs to high-Z when high. |
| 13–20 | B1–B8 | Input/output terminals for B-side 8-bit bus; bidirectional with 3-state control via OEAB/OEBA. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent enable control (OEAB & OEBA) | Enables precise timing of bidirectional data flow-no fixed direction constraint-critical for handshake-based protocols like IEEE-488 or custom bus arbitration. |
| Lock-bus-latch capability | Simultaneous assertion of OEAB and OEBA maintains prior A/B bus states without external latches, reducing component count in data capture and hold circuits. |
| High-current 3-state outputs | ±6 mA drive at 5 V allows direct connection to 15 LSTTL loads-eliminates need for intermediate buffers in retrofitted TTL systems. |
| Wide voltage operation (2–6 V) | Supports interoperability across 3.3 V microcontrollers, 5 V peripherals, and mixed-supply backplanes without level translation. |
| Low input current (≤1 µA) | Minimizes loading on upstream logic or weak-signal sources (e.g., open-collector status lines), preserving signal integrity in fan-out-critical paths. |
Applications
| Industrial Backplane Interconnect | Legacy System Bus Bridging |
|---|---|
|
Use Scenario: Isolating and synchronizing data transfer between CPU and I/O expansion modules in programmable logic controllers (PLCs) with separate 5 V and 3.3 V domains. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing A-bus (CPU side) ↔ B-bus (I/O module side) with independent OEAB/OEBA timing control for cycle-accurate handshaking. Use Value: Eliminates need for discrete direction-control logic and level shifters-reduces BOM cost and layout area while supporting deterministic bus turnaround within 20 ns. |
Use Scenario: Connecting modern FPGA-based controllers to legacy 8-bit ISA-compatible peripheral cards requiring TTL-compatible signaling and bus hold. IC Role / Device Role / Timing Role: Octal transceiver providing bidirectional data path with lock-bus-latch mode to retain peripheral register state during FPGA reconfiguration. Use Value: Maintains stable bus values during FPGA reset/reload events-prevents spurious writes or read corruption without adding external latch ICs. |
| Test Equipment Data Capture | Embedded Diagnostic Interface |
|
Use Scenario: Capturing parallel sensor data streams from multiple analog front-ends into a central microcontroller unit in automated test equipment (ATE). IC Role / Device Role / Timing Role: High-speed 8-bit transceiver enabling burst-mode sampling from dual-channel ADCs onto shared data bus with minimal propagation skew (8 ns typ). Use Value: Synchronizes multi-sensor reads with sub-10 ns timing margin-ensures phase-coherent acquisition across channels without clock domain crossing logic. |
Use Scenario: Providing debug access to internal registers of an automotive ECU via a dedicated 8-bit diagnostic port connected to service tools. IC Role / Device Role / Timing Role: Isolation transceiver protecting ECU core logic from ESD and bus contention during field diagnostics, with fast disable (tdis ≤ 20 ns) for safe hot-plug. Use Value: Guarantees bus isolation within 20 ns of tool disconnect-prevents transient coupling into safety-critical MCU domains during service operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT623DW | CMOS input thresholds shifted to TTL-compatible levels (VIH = 2 V min); identical pinout and timing. | Required when interfacing with legacy 5 V TTL outputs (e.g., 74LS series) without pull-up resistors. | Select SN74HCT623DW only if driving from standard TTL logic; otherwise SN74HC623DWRG4 offers wider voltage flexibility. |
| SN74LVC623APW | Lower VCC range (1.65–5.5 V), faster tpd (5.2 ns typ @ 3.3 V), but only 3.3 V tolerant I/O-no 5 V operation. | Suitable for modern 3.3 V-only systems; incompatible with 5 V buses or mixed-voltage designs. | Choose SN74LVC623APW for speed-critical 3.3 V applications; avoid if 5 V compatibility or 2 V minimum operation is required. |
Compared with SN74HCT623DW and SN74LVC623APW, the SN74HC623DWRG4 uniquely supports 2–6 V operation with true CMOS thresholds, making it the only option for systems requiring both ultra-low-voltage startup (2 V) and robust 5 V bus interfacing without level translation.
Availability
SN74HC623DWRG4 is available at Aetrix Electronics and suitable for industrial backplane interconnect, legacy system bus bridging, and embedded diagnostic interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74HC623DWRG4 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 over 50 years of innovation in industrial, automotive, and communications markets.
The SN74HC623DWRG4 belongs to TI's 74HC high-speed CMOS logic family, engineered for robust bidirectional bus interfacing in noise-sensitive and mixed-voltage environments where reliability and timing precision are critical.
FAQ
What is the maximum operating temperature range for the SN74HC623DWRG4?
The SN74HC623DWRG4 is rated for operation from –40°C to +85°C ambient temperature, matching the commercial-grade specification of the SN74HC623 family. This range is validated per TI's recommended operating conditions and supported by thermal data showing θJA = 58°C/W for the SOIC-DW package.
Does the SN74HC623DWRG4 support lock-bus-latch functionality, and how is it enabled?
Yes, the SN74HC623DWRG4 supports lock-bus-latch mode when both OEAB and OEBA inputs are driven low simultaneously. In this state, each output reinforces its input, allowing all 16 bus lines (A1–A8 and B1–B8) to retain their last logic states-even with all external drivers in high-impedance-enabling data hold without external latches.
Can the SN74HC623DWRG4 interface directly between 3.3 V and 5 V buses?
Yes, the SN74HC623DWRG4 supports 2–6 V operation and has CMOS-compatible input thresholds (VIH = 70% VCC, VIL = 30% VCC), allowing direct connection between 3.3 V and 5 V buses. Its outputs swing rail-to-rail, and ±6-mA drive at 5 V ensures compatibility with LSTTL loads on either side.
What is the meaning of the "G4" suffix in SN74HC623DWRG4?
The "G4" suffix in SN74HC623DWRG4 indicates TI's green packaging standard: lead-free (Pb-free), RoHS-compliant construction with NiPdAu (NIPDAU) lead finish. It does not affect electrical specifications or pinout-SN74HC623DWRG4 is functionally identical to SN74HC623DWR but meets modern environmental compliance requirements.
Is the SN74HC623DWRG4 pin-compatible with other 74HC623 variants such as SN74HC623N or SN74HC623NSR?
Yes, the SN74HC623DWRG4 shares identical pinout and logic functionality with all SN74HC623 variants-including SN74HC623N (PDIP) and SN74HC623NSR (SOP)-as confirmed by TI's official package drawings and function tables. Only package type (SOIC-DW), marking, and packaging differ; electrical and timing specs are fully aligned.
SN74HC623DWRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74HC623DWRG4 FAQ
1.How can I place an order for SN74HC623DWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC623DWRG4 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 SN74HC623DWRG4 reliable?
The price and inventory of SN74HC623DWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC623DWRG4 is usually 5 days.
3.What payment methods are accepted for SN74HC623DWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC623DWRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC623DWRG4?
SN74HC623DWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC623DWRG4 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 SN74HC623DWRG4?
For technical support, including SN74HC623DWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC623DWRG4 requirements.
6.How does Aetrix verify that SN74HC623DWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC623DWRG4 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 SN74HC623DWRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC623DWRG4?
All SN74HC623DWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC623DWRG4, 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 SN74HC623DWRG4 part is unused and in its original packaging.
Return procedure for SN74HC623DWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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