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Texas Instruments SN74HC368NSR
- Part No.:
- SN74HC368NSR
- Manufacturer:
- Texas Instruments
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC368NSR.pdf
- Description:
- IC BUFFER INVERT 6V 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,575
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Product details
Overview
SN74HC368NSR from Texas Instruments is a hex inverting buffer and 3-state line driver IC designed for memory address, bus, and clock signal conditioning. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, features typical propagation delay of 10 ns, low input current (≤1 µA), and high-current 3-state outputs capable of driving up to 15 LSTTL loads in systems such as industrial control backplanes and embedded data buses.
For engineers reviewing the SN74HC368NSR datasheet, SN74HC368NSR pinout, SN74HC368NSR application, or SN74HC368NSR equivalent, this page provides verified functional modes, thermal metrics for SOP-16 packaging, switching characteristics at 50 pF load, and validated alternative options for bus interface redesigns requiring inverting 3-state buffering.
Technical Context
The SN74HC368NSR implements dual independent 3-state buffer groups: one 4-line and one 2-line section, each with active-low output-enable inputs (1OE, 2OE). When OE is low, inverted A-input data passes to Y-outputs; when OE is high, all six outputs enter high-impedance state-enabling bidirectional bus sharing without contention.
It uses silicon-gate CMOS technology with TTL-compatible input thresholds, supports CL = 50 pF and CL = 150 pF load conditions, and maintains stable operation across –40°C to +85°C ambient temperature. Its 80 µA max ICC enables low-power system-level buffering without compromising speed or drive strength.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - compatible with legacy 5 V and modern 3.3 V logic domains without level shifters |
| Output Drive Strength | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads or terminate short PCB traces |
| Propagation Delay (tpd) | 20 ns max at VCC = 4.5 V, CL = 50 pF - ensures timing compliance in 25 MHz synchronous bus interfaces |
| 3-State Enable/Disable Time | ten = 48 ns max, tdis = 41 ns max at VCC = 6 V - critical for glitch-free bus arbitration in multi-master systems |
| Input Leakage Current | ≤1 µA max - eliminates need for external pull-ups on unused inputs in high-impedance control paths |
| Junction-to-Ambient θJA | 87.4 °C/W (SOP-16) - defines maximum power dissipation (≈140 mW) before thermal derating at 85°C ambient |
| Power Dissipation Capacitance | 35 pF per buffer - enables accurate dynamic power estimation in clocked applications |
Pinout & Package
SOP-16 (NS) package: 6.20 mm × 5.30 mm body, 1.27 mm lead pitch, 2.00 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1, tape-and-reel (2000 pcs/reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | A1–A6 Inputs | Inverting data inputs - logic high yields low output when enabled; must be tied to VCC or GND if unused |
| 2, 4, 6, 10, 12, 14 | Y1–Y6 Outputs | Active-low 3-state buffered outputs - high-impedance when corresponding OE is high |
| 7 | GND | Ground reference for all I/O and internal circuitry - requires low-inductance connection to system ground plane |
| 8 | VCC | Positive supply rail - requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin |
| 15 | 1OE | Active-low enable for Y1–Y4 - controls first 4-channel buffer group independently of second group |
| 16 | 2OE | Active-low enable for Y5–Y6 - allows selective isolation of 2-line driver section during partial bus updates |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-State Output Logic | Enables bus contention avoidance in shared-memory architectures by allowing multiple drivers to coexist on same trace |
| Dual Independent Enable Inputs | Permits granular control over 4-line and 2-line sections - reduces unnecessary switching noise during partial data transfers |
| Wide Supply Range (2–6 V) | Supports mixed-voltage system integration - e.g., interfacing 3.3 V microcontrollers to 5 V peripheral buses |
| Low ICC (80 µA max) | Minimizes quiescent power in always-on buffer stages - critical for battery-backed real-time clock or watchdog circuits |
| TTL-Compatible Input Thresholds | Ensures reliable logic interpretation across voltage domains without external biasing networks |
Applications
| Memory Address Buffering | Industrial Backplane Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from an MCU to multiple SRAM chips on a shared bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating address latches during write cycles to prevent bus contention. Use Value: Enables deterministic address settling with ≤20 ns propagation delay and ±6 mA drive - eliminating timing margin violations at 25 MHz bus clock. |
Use Scenario: Interfacing PLC CPU modules to distributed I/O racks via parallel control bus. IC Role / Device Role / Timing Role: Bidirectional bus driver with independent 4-line/2-line enables for segmented rack addressing and status reporting. Use Value: Dual OE inputs allow selective activation of control vs. status lanes - reducing EMI and simplifying arbitration logic in noisy factory environments. |
| Legacy Clock Distribution | Embedded System Reset Conditioning |
Use Scenario: Distributing inverted clock signals from a master oscillator to multiple peripheral controllers. IC Role / Device Role / Timing Role: Low-skew inverting buffer with matched tPLH/tPHL ensuring synchronous edge alignment across receivers. Use Value: 10 ns typical tpd and <1 ns skew between channels maintain setup/hold margins for 50 MHz clock fanout. |
Use Scenario: Debouncing and level-shifting reset signals between 5 V legacy peripherals and 3.3 V SoCs. IC Role / Device Role / Timing Role: Inverting buffer with 3-state capability to isolate reset domain during firmware update sequences. Use Value: High-impedance output mode prevents unintended resets during hot-swap events - supported by guaranteed VIH/VIL thresholds at 3.3 V and 5 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC240N | Octal non-inverting 3-state buffer; identical VCC range, drive, and timing specs but no inversion | Requires external inversion logic for applications needing signal polarity reversal | Select when bus topology demands non-inverted data path and layout allows added gate or inverter placement |
| 74LVC240APW | Lower VCC range (1.65–3.6 V); higher speed (tpd = 5.3 ns @ 3.3 V); 24 mA drive; TSSOP-20 package | Not suitable for 5 V systems; requires PCB redesign due to different pin count and footprint | Prefer for new 3.3 V-only designs where reduced propagation delay and higher drive justify package change |
Compared with SN74HC240N and 74LVC240APW, the SN74HC368NSR uniquely combines inversion, dual OE control, and 5 V compatibility in SOP-16 - making it optimal for retrofitting legacy 5 V bus systems requiring polarity correction without layout revision.
Availability
SN74HC368NSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address buffering, and embedded reset conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC368NSR 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 SN74HC368NSR belongs to TI's 74HC logic family, engineered for high-density, low-power 3-state bus interfacing in memory subsystems, clock distribution networks, and industrial control backplanes.
FAQ
What is the maximum operating temperature for the SN74HC368NSR?
The SN74HC368NSR is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade specification ensures reliable performance in embedded controllers, programmable logic devices, and factory automation equipment where thermal stability is critical. The SOP-16 package's θJA of 87.4 °C/W defines its safe power envelope under these conditions.
Does the SN74HC368NSR require external pull-up resistors on unused inputs?
No - the SN74HC368NSR has CMOS inputs with leakage ≤1 µA, so unused inputs must be tied directly to VCC or GND to prevent floating states and undefined outputs. External pull-up resistors are unnecessary and may increase power consumption or slow edge rates. TI recommends hard-wiring unused A inputs to fixed logic levels per SCBA004 guidelines.
Can the SN74HC368NSR drive a 50-pF capacitive load at 6 V supply?
Yes - the SN74HC368NSR guarantees tpd ≤25 ns and tdis ≤45 ns when driving CL = 50 pF at VCC = 6 V, per TI's SCLS310F datasheet Section 5.5. Its ±6 mA output drive at 5 V scales to ~±7.8 mA at 6 V, ensuring robust signal integrity into typical PCB trace and receiver capacitance without external buffering.
How does the dual output-enable architecture of the SN74HC368NSR improve system design?
The SN74HC368NSR's separate 1OE (pins 15) and 2OE (pin 16) inputs let designers independently control the 4-line and 2-line buffer sections. This enables selective bus segmentation - for example, holding address lines active while disabling status lines during read-modify-write cycles - reducing bus contention, EMI, and timing complexity in multi-function interfaces.
Is the SN74HC368NSR pin-compatible with other 74HC368 variants like SN74HC368N or SN74HC368DR?
Yes - all SN74HC368 variants share identical 16-pin functional pinout and logic behavior. The SN74HC368NSR (SOP-16), SN74HC368N (PDIP-16), and SN74HC368DR (SOIC-16) differ only in package dimensions, thermal resistance, and moisture sensitivity level - allowing direct substitution in existing layouts where mechanical fit and reflow profile permit.
SN74HC368NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SO
SN74HC368NSR FAQ
1.How can I place an order for SN74HC368NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC368NSR 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 SN74HC368NSR reliable?
The price and inventory of SN74HC368NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC368NSR is usually 5 days.
3.What payment methods are accepted for SN74HC368NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC368NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC368NSR?
SN74HC368NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC368NSR 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 SN74HC368NSR?
For technical support, including SN74HC368NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC368NSR requirements.
6.How does Aetrix verify that SN74HC368NSR is sourced from the original manufacturer or authorized distributors?
All SN74HC368NSR 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 SN74HC368NSR meets industry standards.
7.What is the process for return or replacement of SN74HC368NSR?
All SN74HC368NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC368NSR, 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 SN74HC368NSR part is unused and in its original packaging.
Return procedure for SN74HC368NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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