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Texas Instruments SN74HC368DBR
- Part No.:
- SN74HC368DBR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC368DBR.pdf
- Description:
- IC BUFFER INVERT 6V 16SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74HC368DBR from Texas Instruments is a hex inverting buffer and 3-state line driver IC designed for memory address bus driving, clock distribution, and bidirectional data bus interfacing. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 20 ns (VCC = 4.5 V, CL = 50 pF), and draws ≤80 µA ICC. Its dual 4-line/2-line architecture with active-low OE inputs enables selective bus isolation in industrial control and embedded computing systems.
For engineers reviewing the SN74HC368DBR datasheet, SN74HC368DBR pinout, SN74HC368DBR application, or SN74HC368DBR equivalent, this page provides verified functional modes, real-world timing behavior under 50 pF load, 3-state enable/disable timing (ten/tdis), low-input-current operation (<1 µA), and package-specific thermal metrics for SOIC-16 (D) packaging - all critical for bus-hold integrity, power-sensitive designs, and PCB layout validation.
Technical Context
The SN74HC368DBR implements six independent inverting buffers, each with high-impedance 3-state outputs controlled by two active-low enable inputs (1OE, 2OE). Each OE input governs three channels: 1OE controls Y1–Y3, 2OE controls Y4–Y6 - enabling grouped bus arbitration without channel crosstalk.
Its CMOS HCMOS logic family ensures rail-to-rail output swing, TTL-compatible input thresholds (VIH = 3.15 V @ VCC = 4.5 V), and robust noise immunity (VIL = 1.35 V @ VCC = 4.5 V). The device supports hot-swap capable 3-state transitions with defined ten (enable time) and tdis (disable time) parameters - critical for glitch-free bus sharing in multi-master systems.
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 logic driving 5 V bus) |
| Output Drive Current | ±6 mA @ 5 V - sufficient to drive 15 LSTTL loads or terminate short stubs on parallel buses |
| Propagation Delay (tpd) | 20 ns typical @ VCC = 4.5 V, CL = 50 pF - enables reliable operation up to ~25 MHz clock distribution |
| 3-State Enable Time (ten) | 48 ns max @ VCC = 4.5 V, CL = 50 pF - defines minimum wait before valid data appears after OE assertion |
| Quiescent Current (ICC) | 80 µA max @ VCC = 6 V - enables low-power standby in battery-backed or energy-constrained systems |
| Input Leakage Current | 1 µA max - prevents unintended logic state drift when inputs are pulled via high-value resistors |
| Output Leakage (IOZ) | 5 µA max @ VCC = 6 V - ensures minimal bus contention current during high-impedance state |
Pinout & Package
SN74HC368DBR is supplied in a 16-pin SOIC (D) package measuring 9.90 mm × 3.90 mm with 1.27 mm lead pitch. The body height is ≤2.00 mm, compatible with standard automated assembly processes and IPC-7351 land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (1A) | Input to Inverter 1 | Drives inverted output Y1; must be terminated to VCC or GND if unused to prevent floating logic states |
| 2 (1Y) | Inverted Output 1 | Active-low inversion of 1A; enters high-Z when 1OE = high |
| 3 (2A) | Input to Inverter 2 | Drives inverted output Y2; shares same 1OE control as pins 1–3 and 5–6 |
| 4 (2Y) | Inverted Output 2 | Active-low inversion of 2A; high-Z when 1OE = high |
| 5 (3A) | Input to Inverter 3 | Drives inverted output Y3; grouped under 1OE with pins 1, 2, 3, 4 |
| 6 (3Y) | Inverted Output 3 | Active-low inversion of 3A; high-Z when 1OE = high |
| 7 (GND) | Ground Reference | Primary return path for all internal logic and output currents; requires low-inductance connection |
| 8 (4Y) | Inverted Output 4 | Active-low inversion of 4A; controlled by 2OE (pin 13); high-Z when 2OE = high |
| 9 (4A) | Input to Inverter 4 | Drives inverted output Y4; grouped under 2OE with pins 8, 10, 11, 12, 15 |
| 10 (5Y) | Inverted Output 5 | Active-low inversion of 5A; high-Z when 2OE = high |
| 11 (5A) | Input to Inverter 5 | Drives inverted output Y5; shares 2OE control with pins 8–9, 10–12, 15 |
| 12 (6Y) | Inverted Output 6 | Active-low inversion of 6A; high-Z when 2OE = high |
| 13 (2OE) | Active-Low Output Enable 2 | Controls Y4–Y6; low = enabled (inverted pass-through), high = high-Z |
| 14 (VCC) | Positive Supply | Power rail for all logic and output stages; requires local 0.1 µF bypass capacitor per TI recommendation |
| 15 (6A) | Input to Inverter 6 | Drives inverted output Y6; grouped under 2OE with pins 8–13 and 12 |
| 16 (1OE) | Active-Low Output Enable 1 | Controls Y1–Y3; low = enabled (inverted pass-through), high = high-Z |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-State Buffer Architecture | Six independent inverters with grouped OE control (1OE for Y1–Y3, 2OE for Y4–Y6) enables selective bus segment isolation |
| Rail-to-Rail CMOS Output Swing | VOH ≥ 4.4 V / VOL ≤ 0.26 V @ VCC = 4.5 V, IOL = 6 mA - ensures full logic-level compatibility across 3.3 V/5 V domains |
| Low Dynamic Power Consumption | Cpd = 35 pF per buffer - limits switching current and reduces EMI in high-frequency bus applications |
| Controlled 3-State Transition Timing | ten = 48 ns max, tdis = 41 ns max @ VCC = 4.5 V - prevents bus contention during enable/disable sequencing |
| TTL-Compatible Input Thresholds | VIH = 3.15 V, VIL = 1.35 V @ VCC = 4.5 V - allows direct interface with legacy 5 V TTL outputs without level shifters |
Applications
| Memory Address Bus Driver | Industrial PLC Backplane Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from microcontroller to SRAM or EPROM in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control isolates CPU address bus during DMA cycles; OE signals synchronized to bus grant handshake. Use Value: Enables clean bus turn-around with <48 ns enable time, preventing address glitches that cause memory access errors. |
Use Scenario: Interfacing multiple I/O modules to a central backplane in modular automation systems. IC Role / Device Role / Timing Role: Bidirectional bus transceiver section using Y1–Y3 for module A and Y4–Y6 for module B, with OE pins tied to slot-select decoders. Use Value: Provides deterministic 3-state isolation between modules, eliminating signal contention during hot-swap events. |
| Legacy System Clock Distribution | Test Equipment Signal Conditioning |
|
Use Scenario: Distributing inverted clock signals from FPGA to multiple synchronous peripherals operating at ≤25 MHz. IC Role / Device Role / Timing Role: Low-skew inverting buffer stage with matched tpd across all six channels ensures phase-aligned clock edges. Use Value: Achieves <1 ns inter-channel skew (typical), maintaining setup/hold margins for downstream flip-flops. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment before applying to DUT inputs. IC Role / Device Role / Timing Role: Inverting line driver with 3-state capability allows dynamic signal inversion or bus disconnection during test sequence changes. Use Value: ±6 mA drive strength ensures fast edge rates into 50 Ω coaxial loads, preserving signal integrity up to 100 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex inverting buffer with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT368N | Uses HCT logic family: TTL-compatible inputs but CMOS outputs; VIH/VIL fixed at 2 V/0.8 V regardless of VCC | Better suited for mixed 5 V TTL/CMOS systems where input voltage thresholds must remain constant across supply variations | Select SN74HCT368N when interfacing with legacy 5 V TTL sources requiring guaranteed recognition of logic levels at VCC = 4.5–5.5 V |
| 74LCX368MTCX | Lower VCC range (2.0–3.6 V), higher speed (tpd = 5.5 ns @ 3.3 V), and 3.6 V-tolerant inputs | Optimized for 3.3 V-only systems with stringent timing budgets and no need for 5 V operation | Choose 74LCX368MTCX for portable or low-power 3.3 V designs requiring sub-6 ns propagation and reduced dynamic power |
Compared with SN74HC368DBR, SN74HCT368N offers fixed TTL input thresholds ideal for stable 5 V environments, while 74LCX368MTCX delivers faster timing and lower voltage operation at the cost of 5 V compatibility - making SN74HC368DBR the balanced choice for flexible 2–6 V industrial bus interfaces.
Availability
SN74HC368DBR is available at Aetrix Electronics and suitable for industrial control systems, programmable logic controller (PLC) backplanes, and legacy test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74HC368DBR 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74HC368DBR belongs to TI's 74HC logic family, engineered for high noise immunity, low power consumption, and interoperability across mixed-voltage digital systems - targeting memory addressing, clock buffering, and bus isolation in rugged industrial environments.
FAQ
What is the maximum operating temperature for SN74HC368DBR?
The SN74HC368DBR is rated for an operating free-air temperature range of –40°C to +85°C, as specified in the Recommended Operating Conditions table of the official Texas Instruments datasheet (SCLS310F). This makes it suitable for commercial and industrial ambient environments but not extended-temperature or military-grade applications - those require the SN54HC368 variant.
Does SN74HC368DBR support hot-swap operation?
Yes, SN74HC368DBR supports controlled hot-swap operation due to its defined 3-state enable (ten) and disable (tdis) timing parameters - 48 ns and 41 ns respectively at VCC = 4.5 V and CL = 50 pF. These specifications ensure predictable bus release and acquisition, minimizing transient contention when inserted into live backplanes or modular I/O systems.
Can SN74HC368DBR drive a 50-Ω transmission line directly?
SN74HC368DBR can drive a 50-Ω load under DC conditions (±6 mA output drive at 5 V meets basic termination needs), but for high-speed AC signaling, external series termination is recommended. Its typical output impedance (~30 Ω at VCC = 5 V) does not match 50 Ω precisely, and capacitive loading beyond 50 pF degrades tpd and edge fidelity - use with controlled-impedance PCB routing and proper termination networks.
How should unused inputs be handled on SN74HC368DBR?
All unused inputs on SN74HC368DBR must be tied to either VCC or GND - never left floating - to prevent undefined logic states, increased ICC, and potential oscillation. TI's application report SCBA004 explicitly mandates this practice. For inverting buffers, tying an unused A input to GND yields a stable high output (Y = VCC), while tying to VCC yields low (Y = GND), both safe in high-Z mode.
Is SN74HC368DBR pin-compatible with SN74HC240N?
No, SN74HC368DBR is not pin-compatible with SN74HC240N. While both are octal 3-state buffers, SN74HC368DBR has six inverting channels with dual OE control (1OE, 2OE) in a 16-pin SOIC package, whereas SN74HC240N contains eight non-inverting/inverting pairs (four of each) with separate OE pins per group and different pin assignments - direct replacement would require PCB redesign.
SN74HC368DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 2, 4 (Hex)
- 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:
- 16-SSOP
SN74HC368DBR FAQ
1.How can I place an order for SN74HC368DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC368DBR 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 SN74HC368DBR reliable?
The price and inventory of SN74HC368DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC368DBR is usually 5 days.
3.What payment methods are accepted for SN74HC368DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC368DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC368DBR?
SN74HC368DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC368DBR 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 SN74HC368DBR?
For technical support, including SN74HC368DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC368DBR requirements.
6.How does Aetrix verify that SN74HC368DBR is sourced from the original manufacturer or authorized distributors?
All SN74HC368DBR 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 SN74HC368DBR meets industry standards.
7.What is the process for return or replacement of SN74HC368DBR?
All SN74HC368DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC368DBR, 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 SN74HC368DBR part is unused and in its original packaging.
Return procedure for SN74HC368DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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