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Texas Instruments SN74LVTH652DBRE4
- Part No.:
- SN74LVTH652DBRE4
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH652DBRE4.pdf
- Description:
- IC BUS TRANSCEIVER QUAD 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74LVTH652DBRE4 from Texas Instruments is a 3.3-V octal bus transceiver with dual D-type registers, supporting mixed-mode 5-V/3.3-V interfacing, real-time or stored data transfer, and hot-insertion via Ioff and power-up 3-state. It features bus-hold on all A/B data inputs, operates down to 2.7 V, and delivers 64 mA sink current per output at VCC = 3.3 V - used in backplane interface and legacy bus bridging applications.
For engineers reviewing the SN74LVTH652DBRE4 datasheet, SN74LVTH652DBRE4 pinout, SN74LVTH652DBRE4 application, or SN74LVTH652DBRE4 equivalent, key selection criteria include its dual-clock register architecture (CLKAB/CLKBA), independent select-control (SAB/SBA) for glitch-free mode switching, OEAB/OEBA enable logic, and TSSOP-24 package thermal performance (θJA = 88°C/W).
Technical Context
The SN74LVTH652DBRE4 integrates two independent 8-bit bidirectional transceivers with edge-triggered D-type flip-flops per port, enabling simultaneous storage of A- and B-bus data on separate clock edges. Its select-control circuitry eliminates multiplexer glitches during real-time ↔ stored data transitions, with SAB/SBA determining source path without requiring external decoding logic.
It supports true hot-swap operation through Ioff (±100 µA at VCC = 0) and power-up 3-state, ensuring outputs remain high-impedance during power ramping. Bus-hold circuitry (±500 µA dynamic hold current) maintains valid logic levels on floating A/B inputs, eliminating external pull resistors while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2.7 V to 3.6 V - enables stable operation from unregulated batteries or low-noise LDOs in portable industrial systems. |
| Output Drive Strength | 64 mA sink / 32 mA source at VCC = 3.3 V - drives standard TTL loads and long traces without external buffers. |
| Max Clock Frequency | 150 MHz - supports high-speed synchronous bus handshaking in memory-mapped peripheral interfaces. |
| Propagation Delay | tPLH/tPHL ≤ 5.6 ns (A↔B path, VCC = 3.3 V) - ensures timing closure in sub-10 ns critical paths. |
| Bus-Hold Current | ±500 µA at VCC = 3.6 V - actively sustains logic state on unterminated stubs up to 10 cm in length. |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial IEC 61000-4-2 Level 3 immunity requirements without added protection. |
| Thermal Resistance | θJA = 88°C/W (TSSOP-24) - requires ≤ 1.2 W total power dissipation for safe operation at 85°C ambient. |
Pinout & Package
TSSOP-24 package (PW), 7.9 mm × 4.5 mm × 1.2 mm max height, 0.65 mm pitch, exposed metal pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4–11, 14–21 | A1–A8, B1–B8 data I/O | Bidirectional bus terminals with integrated bus-hold; no external termination required. |
| 3, 13 | OEAB, OEBA | Active-low output enables - independently control A→B and B→A data flow direction. |
| 12, 24 | GND, VCC | Power reference pins - decoupling capacitor must be placed within 3 mm of Pin 24. |
| 22, 23 | CLKAB, CLKBA | Edge-triggered clocks - rising-edge sensitive; asynchronous to each other for staggered register loading. |
| 21, 22 | SAB, SBA | Select controls - high = route stored data, low = route real-time bus data; glitch-immune internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage interface | 5-V tolerant inputs/outputs with 3.3-V VCC - bridges legacy 5-V logic to modern low-voltage subsystems without level shifters. |
| Dual independent registers | Separate CLKAB/CLKBA and SAB/SBA controls - enables concurrent capture of A- and B-bus states for time-stamped diagnostics. |
| Hot-insertion support | Ioff + power-up 3-state - prevents backdrive current and bus contention during live card replacement in telecom backplanes. |
| Bus-hold circuitry | Eliminates need for 10-kΩ pullup/pulldown resistors on all 16 data lines - reduces BOM count and PCB area by ≥20 mm². |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - maintains signal integrity across 8-bit parallel buses under heavy switching conditions. |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridging |
|---|---|
Use Scenario: Interfacing a 3.3-V microcontroller to a 5-V ISA-style expansion bus in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and data latch, synchronizing CPU writes to legacy peripherals using CLKAB-triggered storage. Use Value: Eliminates discrete level shifters and glue logic while providing deterministic timing via registered outputs. |
Use Scenario: Connecting a modern FPGA-based control module to aging 5-V RS-422 transceivers in test equipment racks. IC Role / Device Role / Timing Role: Real-time bus repeater with optional storage - holds last command word during FPGA reconfiguration cycles. Use Value: Maintains bus state continuity during 100+ ms FPGA reload windows without host software intervention. |
| Hot-Swappable Module Control | Multi-Source Data Multiplexing |
Use Scenario: Power-management subsystem in modular server blades where daughter cards are inserted/removed under load. IC Role / Device Role / Timing Role: Isolation gate with Ioff-enabled high-Z during VCC ramp - prevents backfeed into powered backplane during insertion. Use Value: Meets Telcordia GR-63-CORE hot-swap compliance without auxiliary sequencing circuitry. |
Use Scenario: Selecting between two sensor data streams (A = temperature, B = pressure) feeding a shared ADC interface. IC Role / Device Role / Timing Role: Glitch-free multiplexer with register staging - avoids transient invalid codes during source switching. Use Value: Guarantees clean 8-bit sample transitions without software debouncing or additional FIFO buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver with register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT652DBR | No bus-hold; lower drive (32 mA sink); lacks Ioff - requires external pull resistors and careful power sequencing. | Not suitable for floating-bus or hot-swap environments; limited to controlled-power systems. | Choose only if cost sensitivity outweighs reliability requirements and board space allows pull resistors. |
| SN74LVTH16652DGGR | 16-bit version in TSSOP-56; higher ICC (12 mA typical); same logic family but doubled channel count. | Replaces two SN74LVTH652DBRE4 units; requires PCB redesign due to larger footprint and different pinout. | Select when scaling to 16-bit buses - avoid for 8-bit designs due to over-specification and layout overhead. |
Compared with SN74LVTH652DBRE4, SN74LVT652DBR sacrifices bus-hold and hot-swap robustness for lower cost, while SN74LVTH16652DGGR trades pin compatibility for channel density - making SN74LVTH652DBRE4 the optimal choice for space-constrained 8-bit mixed-voltage bridging with zero-external-component operation.
Availability
SN74LVTH652DBRE4 is available at Aetrix Electronics and suitable for industrial backplane interface, legacy system bus bridging, and hot-swappable module control requiring stable component supply across extended product lifecycles.
Supply support for SN74LVTH652DBRE4 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 connectivity solutions for industrial, automotive, and communications markets.
The SN74LVTH652DBRE4 belongs to TI's LVTH logic family, engineered for robust mixed-signal interfacing in harsh environments - emphasizing voltage translation, bus integrity, and hot-plug resilience.
FAQ
What is the maximum operating frequency of the SN74LVTH652DBRE4?
The SN74LVTH652DBRE4 supports a maximum clock frequency of 150 MHz under recommended conditions (VCC = 3.3 V ± 0.3 V, TA = 25°C). This applies to both CLKAB and CLKBA inputs, enabling high-speed synchronous data capture and transfer between A and B buses. Timing margins must be verified per application-specific load and trace routing.
Does the SN74LVTH652DBRE4 require external pullup resistors on its data inputs?
No, the SN74LVTH652DBRE4 includes active bus-hold circuitry on all A1–A8 and B1–B8 inputs, eliminating the need for external pullup or pulldown resistors. This feature maintains valid logic states on floating inputs and reduces BOM count. Using external resistors with enabled bus-hold is not recommended and may cause contention.
Can the SN74LVTH652DBRE4 operate with a 5-V supply?
No, the SN74LVTH652DBRE4 is rated for VCC = 2.7 V to 3.6 V only. However, its inputs and outputs are 5-V tolerant - meaning it can safely interface with 5-V systems while powered from 3.3 V. Applying 5 V to VCC exceeds absolute maximum ratings and will damage the device.
How does the SN74LVTH652DBRE4 support hot-insertion?
The SN74LVTH652DBRE4 supports hot-insertion via two mechanisms: Ioff circuitry disables outputs when VCC = 0, preventing back-current flow; and power-up 3-state forces outputs into high-impedance during power ramping (0–1.5 V). Together, they eliminate bus contention and driver conflicts during live card insertion into powered backplanes.
What is the thermal resistance (θJA) of the SN74LVTH652DBRE4 in its TSSOP package?
The SN74LVTH652DBRE4 in the TSSOP-24 (PW) package has a junction-to-ambient thermal resistance (θJA) of 88°C/W, as specified in the official TI datasheet. This value assumes standard JEDEC 2-layer board conditions; actual performance improves with copper pour and thermal vias beneath the exposed pad.
SN74LVTH652DBRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74LVTH652DBRE4 FAQ
1.How can I place an order for SN74LVTH652DBRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH652DBRE4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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6.How does Aetrix verify that SN74LVTH652DBRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH652DBRE4 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 SN74LVTH652DBRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH652DBRE4?
All SN74LVTH652DBRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH652DBRE4, 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 SN74LVTH652DBRE4 part is unused and in its original packaging.
Return procedure for SN74LVTH652DBRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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