My Inquiry
My Account
Texas Instruments SN74HC652NT
- Part No.:
- SN74HC652NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74HC652NT.pdf
- Description:
- IC TXRX NON-INVERT 6V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,005
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC652NT from Texas Instruments is an octal bus transceiver and register IC with 3-state outputs, designed for bidirectional data routing between two 8-bit buses (A and B) in TTL/CMOS mixed-signal systems. It supports real-time or stored-data transfer via independent select controls (SAB/SBA), dual clock inputs (CLKAB/CLKBA), and separate output enables (OEAB/OEBA). Key confirmed specs: 2–6 V supply range, 11 ns typical propagation delay at 5 V, ±6 mA output drive, 80 µA max ICC, and high-current 3-state outputs driving up to 15 LSTTL loads.
For engineers reviewing the SN74HC652NT datasheet, SN74HC652NT pinout, SN74HC652NT application, or SN74HC652NT equivalent, this page delivers verified functional architecture, precise timing behavior under CL = 50 pF, thermal performance (θJA = 67°C/W for NT package), bus-isolation logic states, and real-world design guidance for power-up sequencing and simultaneous storage/reinforcement modes.
Technical Context
The SN74HC652NT integrates eight identical bidirectional channels, each containing a D-type flip-flop, multiplexer, and 3-state output driver. Its dual-clock architecture allows independent latching of A-bus or B-bus data on rising edges of CLKAB or CLKBA, while SAB/SBA control whether outputs reflect live bus signals or registered values - enabling four distinct bus-management functions: isolation, real-time transfer, stored-data transfer, and concurrent A/B storage.
Control logic ensures deterministic behavior during power transitions: OEBA must be pulled up to VCC and OEAB pulled down to GND to guarantee high-impedance outputs at power-up/down. Input thresholds are CMOS-compatible (VIH = 3.15 V min at VCC = 4.5 V; VIL = 1.35 V max), and all unused inputs require explicit VCC/GND termination per TI SCBA004 guidelines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - supports direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Typical Propagation Delay | 11 ns at VCC = 5 V, CL = 50 pF - enables reliable operation in 27 MHz clocked systems (fmax = 27 MHz). |
| Output Drive Strength | ±6 mA at VCC = 5 V - sufficient to directly drive 15 LSTTL loads without external buffers. |
| Quiescent Supply Current | 80 µA max - ensures low static power in battery-backed or energy-sensitive applications. |
| Input Leakage Current | 1 µA max - prevents unintended logic state shifts in high-impedance or long-trace configurations. |
| Thermal Resistance θJA | 67°C/W (NT package) - defines maximum allowable power dissipation (≈150 mW) at TA = 85°C ambient. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and instrumentation environments. |
Pinout & Package
SN74HC652NT is supplied in a 24-pin plastic dual in-line package (PDIP-NT), with 0.300-inch body width and through-hole mounting. Pin 1 is located at the top-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKAB | Rising-edge clock input controlling latching of A-bus data into internal registers. |
| 2 | SAB | Select control for A→B path: low = real-time A data to B bus; high = stored A data to B bus. |
| 3 | OEAB | Active-low output enable for A→B direction: low = enabled; high = high-impedance. |
| 4–11 | A1–A8 | 8-bit bidirectional data terminals for A bus - serve as inputs during store, outputs during transfer. |
| 12 | GND | Ground reference for all internal circuitry and I/O structures. |
| 13 | VCC | Positive supply rail (2–6 V) powering logic core and output drivers. |
| 14 | CLKBA | Rising-edge clock input controlling latching of B-bus data into internal registers. |
| 15 | SBA | Select control for B→A path: low = real-time B data to A bus; high = stored B data to A bus. |
| 16 | OEBA | Active-low output enable for B→A direction: low = enabled; high = high-impedance. |
| 17–24 | B1–B8 | 8-bit bidirectional data terminals for B bus - functionally symmetric to A1–A8. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent clock domains | Separate CLKAB and CLKBA inputs allow asynchronous capture of A and B bus data without cross-domain timing constraints. |
| Multiplexed real-time/stored data paths | SAB/SBA pins enable dynamic switching between live bus signals and registered values - critical for glitch-free bus arbitration. |
| Simultaneous storage and reinforcement mode | When OEAB and OEBA are both low, outputs mirror inputs - preserving bus state even when other drivers are tri-stated. |
| Power-up safe 3-state control | OEBA tied to VCC and OEAB tied to GND ensures defined high-Z outputs during power ramp - prevents bus contention. |
| Wide voltage compatibility | 2–6 V operation permits interoperability across legacy 5 V and modern 3.3 V subsystems without external level translation. |
Applications
| Industrial PLC Backplane Interface | Legacy System Bus Extender |
|---|---|
|
Use Scenario: Interfacing a microcontroller-based CPU module to multiple I/O expansion cards over a shared 8-bit data bus in programmable logic controllers. IC Role / Device Role / Timing Role: SN74HC652NT acts as a bidirectional bus repeater with register hold capability, isolating CPU writes from I/O reads while buffering signal integrity across long backplane traces. Use Value: Enables deterministic read-modify-write cycles using stored-data mode, eliminating race conditions during multi-cycle peripheral access sequences. |
Use Scenario: Extending the address/data bus of an aging 8085-based system to support additional memory or peripheral modules without modifying original motherboard layout. IC Role / Device Role / Timing Role: SN74HC652NT serves as a transparent bus transceiver during normal operation and stores critical bus states during interrupt service routines to preserve context. Use Value: Maintains full TTL compatibility and timing margins (tpd = 11 ns) while adding register functionality absent in standard 74LS245 equivalents. |
| Test Equipment Signal Routing Matrix | Automotive ECU Diagnostic Interface |
|
Use Scenario: Configurable signal routing between multiple instrument channels (DMM, scope, signal generator) in automated test equipment requiring reprogrammable data paths. IC Role / Device Role / Timing Role: SN74HC652NT implements a hardware-multiplexed bus matrix where SAB/SBA and OE controls dynamically assign source/sink roles to A/B ports under microcontroller supervision. Use Value: Eliminates need for discrete analog switches or FPGA-based routing logic - reduces component count and improves timing predictability in deterministic test sequences. |
Use Scenario: Bridging diagnostic communication between a CAN controller and legacy UART-based debug port in automotive electronic control units during development and field service. IC Role / Device Role / Timing Role: SN74HC652NT buffers and isolates bidirectional UART signals (TX/RX) while storing handshake states (RTS/CTS) to synchronize protocol handshaking across voltage-domain boundaries. Use Value: Provides robust 3-state isolation during CAN bus error frames, preventing UART corruption - validated for –40°C to +85°C operation in engine bay environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC245N | No internal registers; lacks CLKAB/CLKBA, SAB/SBA, and storage capability - purely real-time transceiver. | Suitable only for simple bidirectional data transfer without state retention or multiplexed path selection. | Choose SN74HC245N when bus isolation and direction control suffice, and register functionality is unnecessary. |
| SN74ACT652N | Faster tpd = 6.5 ns (typ), higher drive (±24 mA), but narrower VCC range (4.5–5.5 V) and no 3.3 V compatibility. | Preferred in high-speed 5 V-only systems where timing margin is critical and voltage flexibility is not required. | Choose SN74ACT652N for 5 V applications demanding sub-7 ns propagation and stronger drive, accepting reduced voltage range. |
Compared with SN74HC245N, SN74HC652NT adds essential register and multiplexing logic for deterministic bus arbitration; compared with SN74ACT652N, it trades speed and drive strength for broader supply voltage support and industrial temperature tolerance - making SN74HC652NT optimal for mixed-voltage, register-aware embedded interfaces.
Availability
SN74HC652NT is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy system bus extenders, and test equipment signal routing matrices requiring stable component supply, long-term lifecycle assurance, and through-hole manufacturability.
Supply support for SN74HC652NT 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 with broad industrial, automotive, and communications reach.
The SN74HC652NT belongs to TI's 74HC high-speed CMOS logic family, engineered for low-power, wide-voltage-operation digital interfacing in resource-constrained and mixed-signal embedded systems.
FAQ
What is the primary function of the SN74HC652NT in a digital system?
The SN74HC652NT functions as an octal bidirectional bus transceiver with integrated D-type registers and 3-state outputs. It enables controlled data flow between two 8-bit buses (A and B), supporting both real-time pass-through and stored-data transfer modes via dedicated clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls - making it ideal for bus arbitration, isolation, and state-holding applications in industrial and legacy computing systems.
How does the SN74HC652NT handle power-up sequencing to avoid bus contention?
To prevent bus contention during power-up or power-down, the SN74HC652NT requires OEBA to be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor. This configuration forces both transceiver directions into high-impedance states until valid control signals are established - a requirement explicitly documented in the TI SCLS151E datasheet and critical for reliable operation in multi-driver bus environments.
Can the SN74HC652NT operate reliably at 3.3 V supply voltage?
Yes, the SN74HC652NT is fully specified for operation from 2 V to 6 V, including 3.3 V nominal supply. At VCC = 3.3 V, its input thresholds (VIH = 2.0 V min, VIL = 1.0 V max), output drive (±4 mA typ), and propagation delay (~14 ns) remain within guaranteed limits per the recommended operating conditions table - enabling seamless integration into mixed-voltage 3.3 V/5 V systems without level shifters.
What is the significance of the "multiplexed real-time and stored data" feature in the SN74HC652NT?
This feature allows the SN74HC652NT to dynamically route either live bus signals (real-time mode) or previously latched register contents (stored-data mode) between A and B buses using SAB/SBA controls. It enables advanced bus management functions like glitch-free arbitration, context preservation during interrupts, and synchronized data exchange - capabilities absent in basic transceivers such as the SN74HC245N and essential for deterministic embedded control architectures.
Is the SN74HC652NT pin-compatible with other packages in the '652 family?
Yes, the SN74HC652NT (PDIP-NT) shares identical pinout and electrical functionality with SN74HC652DW (SOIC-24) and SN74HC652DWR (tape-and-reel SOIC-24), as confirmed by TI's SCLS151E datasheet Figure 1 and ordering table. All variants use the same 24-pin topology with CLKAB at pin 1, OEAB at pin 3, A1–A8 at pins 4–11, GND at pin 12, VCC at pin 13, and mirrored B-side signals at pins 14–24 - enabling drop-in replacement across package types.
SN74HC652NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 24-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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74HC652NT FAQ
1.How can I place an order for SN74HC652NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC652NT 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 SN74HC652NT reliable?
The price and inventory of SN74HC652NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC652NT is usually 5 days.
3.What payment methods are accepted for SN74HC652NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC652NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC652NT?
SN74HC652NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC652NT 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 SN74HC652NT?
For technical support, including SN74HC652NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC652NT requirements.
6.How does Aetrix verify that SN74HC652NT is sourced from the original manufacturer or authorized distributors?
All SN74HC652NT 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 SN74HC652NT meets industry standards.
7.What is the process for return or replacement of SN74HC652NT?
All SN74HC652NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC652NT, 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 SN74HC652NT part is unused and in its original packaging.
Return procedure for SN74HC652NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC652NT 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
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…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
