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Texas Instruments SN74LVCH8T245DBR
- Part No.:
- SN74LVCH8T245DBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVCH8T245DBR.pdf
- Description:
- IC TRANSLATION TXRX 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:24,076
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Product details
Overview
SN74LVCH8T245 from Texas Instruments is an 8-bit dual-supply noninverting bus transceiver enabling bidirectional voltage-level translation between 1.65V–5.5V domains (e.g., 1.8V ↔ 3.3V, 2.5V ↔ 5V). It features configurable VCCA/VCCB rails, bus-hold on all data I/Os, Ioff partial-power-down protection, and VCC isolation - deployed in smart meter data interfaces and industrial wired networking systems.
For engineers reviewing the SN74LVCH8T245 datasheet, SN74LVCH8T245 pinout, SN74LVCH8T245 application, or SN74LVCH8T245 equivalent, key selection criteria include dual-rail level-shifting capability, 3-state output control referenced to VCCA, guaranteed glitch-free power sequencing, and compatibility with mixed-voltage FPGA-to-microcontroller interconnects.
Technical Context
The SN74LVCH8T245 implements a fully asynchronous, dual-rail CMOS architecture where DIR and OE inputs are referenced exclusively to VCCA, while A-port I/Os track VCCA and B-port I/Os track VCCB. Both supply rails operate independently across 1.65V–5.5V, enabling deterministic level translation without direction-dependent voltage constraints.
Its functional modes are defined by OE (global 3-state enable) and DIR (data flow direction), with active bus-hold circuitry on all 16 data pins eliminating external biasing. The VCC isolation feature forces high-impedance outputs when either VCCA or VCCB falls below 100 mV or floats - critical for hot-swap and partial-power-down reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.65V to 5.5V each - enables interoperability across 1.8V, 2.5V, 3.3V, and 5V logic domains without external level shifters. |
| Max Output Drive | ±32 mA at VCCO = 5V - supports driving moderate capacitive loads (e.g., PCB traces + multiple CMOS inputs) with fast edge rates. |
| Propagation Delay | 0.3 ns (min) to 23.8 ns (max) - varies with VCCA/VCCB combination; e.g., 0.7 ns typical A→B at 3.3V→3.3V, enabling >100 MHz data throughput. |
| Bus-Hold Current | ±15 μA to ±100 μA (IBHL/IBHH) - actively holds undriven A/B pins at valid logic levels, removing need for 10-kΩ pull-up/down resistors. |
| Ioff Leakage | ±2 μA max per pin at 0V supply - prevents back-current during partial power-down, protecting powered subsystems from unintended discharge paths. |
| ESD Rating | ±4000 V HBM, ±1000 V CDM - exceeds JEDEC JESD22-A114 and JESD22-C101, supporting robust handling in automated assembly and field environments. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade operation in smart grid infrastructure and medical monitoring equipment. |
Pinout & Package
SN74LVCH8T245DBR uses the DB (SSOP-24) package: 24-pin shrink small-outline package, 8.2 mm × 7.8 mm body size, 0.65 mm pitch, gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply reference | Powers A-side I/Os and references DIR/OE logic thresholds; must be stable before enabling control signals. |
| DIR (Pin 2) | Direction-control input | High = A→B data flow; Low = B→A; referenced to VCCA - ensures correct interpretation even during asymmetric rail ramp-up. |
| A1–A8 (Pins 3–10) | A-port bidirectional I/O | Track VCCA; include integrated bus-hold; tolerate 0V–6.5V input regardless of VCCA state when in high-Z. |
| GND (Pins 11, 12, 13) | Ground return | Three dedicated GND pins minimize ground bounce and improve noise immunity in high-speed bidirectional switching. |
| VCCB (Pins 23, 24) | B-port supply reference | Powers B-side I/Os; independent of VCCA; VCCB < 100 mV forces B-port outputs into high-Z regardless of OE/DIR state. |
| OE (Pin 22) | Output-enable input | Active-low; referenced to VCCA; pulling OE high disables all outputs - used for bus arbitration and power sequencing control. |
| B1–B8 (Pins 14–21) | B-port bidirectional I/O | Track VCCB; include integrated bus-hold; support hot-plug operation when VCCA remains powered and VCCB floats. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail level shifting | Independent 1.65V–5.5V operation on VCCA and VCCB enables seamless interface between heterogeneous voltage domains without external components. |
| Glitch-free power sequencing | Either VCCA or VCCB may power up/down in any order without generating spurious output transitions - eliminates false resets in connected peripherals. |
| Integrated bus-hold | Eliminates need for 16 external pull-up/pull-down resistors, reducing BOM count, board area, and signal integrity risk from stubs or mismatched terminations. |
| VCC isolation & disconnect | Outputs enter high-impedance state if either VCCA or VCCB drops below 100 mV or floats - essential for safe hot-swap and modular system design. |
| Ioff partial-power-down | Prevents damaging current backflow when one port is unpowered while the other remains active - meets JESD78 Class II latch-up immunity (>100 mA). |
Applications
| Smart Meter Interface | Industrial Wired Networking |
|---|---|
|
Use Scenario: Isolating 3.3V microcontroller UART lines from 5V PLC communication modules in AMI smart meters. IC Role / Device Role / Timing Role: Bidirectional level translator managing RS-485 PHY interface timing while maintaining signal integrity across voltage domains. Use Value: Enables direct connection without discrete level shifters or voltage dividers, reducing component count and improving ESD robustness per IEC 61000-4-2. |
Use Scenario: Interfacing 1.8V FPGA I/O banks with legacy 2.5V Ethernet MAC controllers in industrial gateways. IC Role / Device Role / Timing Role: Asynchronous bus transceiver providing sub-10 ns propagation delay and controlled slew rate for 25 MHz MDIO clock/data handshaking. Use Value: Eliminates timing skew between control and data paths while supporting hot-plug reconfiguration of network modules. |
| Medical Monitoring Backplane | Video Surveillance SoC Interconnect |
|
Use Scenario: Connecting low-power 1.8V sensor ADCs to 3.3V central processing unit in portable patient monitors. IC Role / Device Role / Timing Role: Voltage-translating transceiver with Ioff and bus-hold ensuring safe idle states during sleep/wake transitions. Use Value: Prevents leakage-induced battery drain and maintains valid logic states on floating sensor buses during power-gating cycles. |
Use Scenario: Bridging 2.5V image signal processor (ISP) parallel video bus to 3.3V video encoder ASIC in IP camera modules. IC Role / Device Role / Timing Role: High-drive (±24 mA) 8-bit transceiver supporting 80 MHz pixel clock with matched A/B port timing. Use Value: Sustains clean video data transfer without added termination or repeaters, reducing jitter and pixel corruption in HD streams. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH8T245 | Lower VCC min (1.2V), higher speed (tPLH/tPHL down to 0.25 ns), but no bus-hold; requires external biasing. | Better suited for ultra-low-voltage, high-frequency FPGA interconnects where board space permits pull resistors. | Choose when operating below 1.65V or requiring <1 ns propagation delay; avoid if bus-hold is required for undriven signal integrity. |
| TXB0108 | Auto-direction sensing (no DIR pin), lower drive (±2 mA), no VCC isolation; relies on external power-good sequencing. | Ideal for simple uni-directional or auto-sensing I²C/SPI bridges, not for controlled bidirectional bus arbitration. | Prefer for low-power, low-pin-count I/O expansion; avoid in applications requiring explicit DIR control or VCC-float safety. |
Compared with SN74AVCH8T245 and TXB0108, the SN74LVCH8T245 uniquely combines bus-hold, VCC isolation, and robust 32-mA drive across full 1.65V–5.5V rails - making it optimal for industrial and medical systems demanding fail-safe mixed-voltage interconnects without external components.
Availability
SN74LVCH8T245DBR is available at Aetrix Electronics and suitable for smart meter interface, industrial wired networking, medical monitoring backplane, and video surveillance SoC interconnect applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74LVCH8T245DBR 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 company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The SN74LVCH8T245 belongs to TI's LVCH logic family, engineered for robust mixed-voltage system interfacing in harsh industrial and infrastructure environments where power sequencing resilience and I/O protection are critical.
FAQ
What voltage ranges does the SN74LVCH8T245 support on VCCA and VCCB?
The SN74LVCH8T245 supports independent supply voltages from 1.65V to 5.5V on both VCCA and VCCB. This allows translation between common logic families including 1.8V, 2.5V, 3.3V, and 5V domains - for example, connecting a 1.8V FPGA to a 3.3V microcontroller. Operation outside this range violates absolute maximum ratings and risks permanent damage to the SN74LVCH8T245.
How does the SN74LVCH8T245 handle power sequencing when VCCA and VCCB are powered up at different times?
The SN74LVCH8T245 guarantees glitch-free operation during asymmetric power sequencing: either VCCA or VCCB may be applied or removed in any order without causing spurious output transitions. This behavior is enabled by internal circuitry that isolates control logic (DIR/OE) from B-port I/Os until VCCB stabilizes - a key reliability feature confirmed in the SN74LVCH8T245 datasheet Section 7.3.3.
Does the SN74LVCH8T245 require external pull-up or pull-down resistors on its data lines?
No - the SN74LVCH8T245 integrates active bus-hold circuitry on all 16 data I/O pins (A1–A8, B1–B8), which maintains valid logic states on undriven or floating inputs. Using external resistors defeats the bus-hold function and may cause contention or increased power consumption. This capability is explicitly documented in the SN74LVCH8T245 Features list and Section 7.3.4.
What happens to the outputs of the SN74LVCH8T245 if VCCB is disconnected while VCCA remains powered?
If VCCB drops below 100 mV or floats while VCCA is powered, the SN74LVCH8T245 automatically places all B-port outputs (B1–B8) into a high-impedance state - a feature called VCC isolation. This prevents back-driving or latch-up in downstream 5V devices and is verified in the SN74LVCH8T245 Electrical Characteristics table under Ioff and VCC isolation test conditions.
Can the SN74LVCH8T245 drive standard TTL or CMOS loads directly?
Yes - the SN74LVCH8T245 delivers ±32 mA output drive at 5V, sufficient to drive multiple 74LVC or standard TTL inputs (typically 20–40 μA load per gate). Its balanced push-pull outputs ensure consistent rise/fall times across logic families, and its 10 pF typical I/O capacitance minimizes loading on source devices - characteristics validated in the SN74LVCH8T245 Switching Characteristics tables.
SN74LVCH8T245DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74LVCH8T245DBR FAQ
1.How can I place an order for SN74LVCH8T245DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH8T245DBR 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 SN74LVCH8T245DBR reliable?
The price and inventory of SN74LVCH8T245DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH8T245DBR is usually 5 days.
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Once your SN74LVCH8T245DBR 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 SN74LVCH8T245DBR?
For technical support, including SN74LVCH8T245DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH8T245DBR requirements.
6.How does Aetrix verify that SN74LVCH8T245DBR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH8T245DBR 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 SN74LVCH8T245DBR meets industry standards.
7.What is the process for return or replacement of SN74LVCH8T245DBR?
All SN74LVCH8T245DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH8T245DBR, 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 SN74LVCH8T245DBR part is unused and in its original packaging.
Return procedure for SN74LVCH8T245DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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