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Texas Instruments SN74LVCHR16245ALR
- Part No.:
- SN74LVCHR16245ALR
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVCHR16245ALR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
SN74LVCHR16245ALR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between voltage domains. It operates from 1.65 V to 3.6 V, accepts 5.5-V-tolerant inputs, and delivers 4.8 ns max propagation delay at 3.3 V - enabling use in mixed-voltage telecom infrastructure backplanes and industrial transport control modules.
For engineers reviewing the SN74LVCHR16245ALR datasheet, SN74LVCHR16245ALR pinout, SN74LVCHR16245ALR application, or SN74LVCHR16245ALR equivalent, key selection considerations include its 26-Ω integrated output series resistance, bus-hold inputs eliminating external resistors, Ioff support for live insertion, and SSOP-48 package compatibility with legacy 0.635-mm pitch layouts.
Technical Context
This device implements two independent 8-bit transceiver channels (A↔B), each controlled by dedicated DIR and OE pins. Direction control is level-sensitive and asynchronous; output enable is active-low and fully disables both ports into high-impedance state without affecting input functionality.
All 32 I/Os feature bus-hold circuitry that actively maintains valid logic levels on floating inputs, and all outputs integrate 26-Ω series termination to suppress overshoot/undershoot - verified at VCC = 3.3 V, TA = 25°C with typical VOHV > 2 V and VOLP < 0.8 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports single-supply operation across 1.8-V, 2.5-V, and 3.3-V logic domains |
| Input Voltage Tolerance | Up to 5.5 V - enables direct interfacing with 5-V peripherals without level-shifting circuitry |
| Max Propagation Delay | 4.8 ns at VCC = 3.3 V - ensures timing compliance in high-speed parallel bus applications up to ~100 MHz |
| Output Drive Strength | ±12 mA per pin - sufficient to drive standard CMOS loads and light stubs in point-to-point or daisy-chained buses |
| Ioff Current | ±10 µA at VI/VO = 5.5 V, VCC = 0 V - prevents back-drive damage during hot-swap or partial power-down sequences |
| Bus-Hold Current | ±45 µA at VI = 1.7 V (VCC = 3 V) - maintains stable logic states on unconnected data lines without external biasing |
| ESD Rating | 2000-V HBM - meets industrial-grade robustness requirements per JESD22-A114 |
Pinout & Package
SN74LVCHR16245ALR uses a 48-pin SSOP (DL) package measuring 15.88 mm × 7.49 mm with 0.635-mm lead pitch. Pin assignments follow TI's standardized dual-octal transceiver layout with mirrored A/B port groups, dedicated DIR/OE controls per side, and distributed VCC/GND pairs for noise suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Level-sensitive signal determining data flow direction per 8-bit channel (L = B→A, H = A→B) |
| 1OE, 2OE | Output enable input | Active-low control disabling both A and B ports of respective channel into high-Z state |
| 1A1–1A8, 2A1–2A8 | Data I/O port A | First octet of bidirectional data lines - electrically identical to B-side with bus-hold and 26-Ω series resistance |
| 1B1–1B8, 2B1–2B8 | Data I/O port B | Second octet of bidirectional data lines - supports independent direction control per channel |
| VCC (pins 7, 18, 31, 42) | Power supply | Four distributed VCC pins reduce IR drop and improve PSRR across wide operating range (1.65–3.6 V) |
| GND (pins 4, 10, 15, 21, 28, 34, 39, 45) | Ground reference | Eight GND pins provide low-inductance return paths and minimize ground bounce in high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5.5-V-tolerant inputs allow seamless integration between 3.3-V microcontrollers and 5-V legacy peripherals |
| Integrated 26-Ω output series resistance | Eliminates need for external termination resistors - reduces BOM count and PCB area in high-density routing |
| Bus-hold on all data inputs | Prevents floating inputs from drifting to indeterminate states - removes requirement for pull-up/pull-down networks |
| Ioff partial power-down protection | Blocks current flow when VCC = 0 V - enables safe insertion/removal in powered-backplane systems |
| Latch-up immunity | >250 mA per JESD17 - ensures reliability under transient overvoltage or ESD stress conditions |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Bidirectional data exchange between 3.3-V FPGA-based line cards and 5-V legacy switch fabric ASICs in carrier-grade routers. IC Role / Device Role / Timing Role: Level-translating bus transceiver managing synchronous parallel address/data transfers with sub-5-ns timing margin. Use Value: Eliminates discrete level shifters and termination resistors while maintaining signal integrity across 15-cm backplane traces. |
Use Scenario: Isolating and translating control signals between 24-V isolated I/O modules and 3.3-V ARM-based controller in modular PLC chassis. IC Role / Device Role / Timing Role: Asynchronous bidirectional buffer enabling hot-swappable module detection and configuration handshaking. Use Value: Bus-hold inputs prevent spurious interrupts during module insertion; Ioff protects controller during live replacement. |
| Server Memory Interposer | Test Equipment Signal Routing |
Use Scenario: Interfacing DDR3 memory controllers (1.5-V core, 3.3-V I/O) with legacy DIMM slots requiring 5-V presence detect and SPD access. IC Role / Device Role / Timing Role: Dual-channel transceiver handling SPD read/write cycles and presence detection signaling with precise OE timing control. Use Value: 4.8-ns tpd ensures setup/hold compliance for 400-kHz I²C SPD interface; 5.5-V tolerance handles open-drain pull-ups. |
Use Scenario: Reconfigurable signal path routing in automated test equipment where DUT interfaces vary between 1.8-V, 2.5-V, and 3.3-V logic families. IC Role / Device Role / Timing Role: Programmable bus isolator enabling dynamic reassignment of 16-bit data lanes via FPGA-controlled DIR/OE signals. Use Value: Single-component solution replaces multiple discrete translators; SSOP-48 footprint simplifies layout reuse across test platforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245A | No bus-hold; no 5.5-V input tolerance; lower drive (±24 mA); same SSOP-48 package | Requires external pull resistors; limited to 3.3-V-only systems; higher current capability for heavier loads | Select when cost sensitivity outweighs mixed-voltage needs and external biasing is acceptable |
| SN74AVC16245 | Lower VCC range (1.2–3.6 V); higher speed (2.8 ns tpd @ 1.8 V); no Ioff; different pinout | Better suited for ultra-low-voltage mobile SoC interconnect; incompatible pin mapping prevents drop-in replacement | Choose for next-gen 1.2-V/1.8-V designs where timing margin is critical and live insertion not required |
Compared with SN74LVCHR16245ALR, SN74LVC16245A lacks bus-hold and 5-V tolerance but offers higher drive strength, while SN74AVC16245 provides faster performance at lower voltages but requires PCB redesign due to pinout mismatch and missing Ioff protection.
Availability
SN74LVCHR16245ALR is available at Aetrix Electronics and suitable for telecom infrastructures, industrial transport systems, and server backplane designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVCHR16245ALR 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 high-reliability interface ICs.
The SN74LVCHR16245ALR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for robust mixed-voltage communication in mission-critical infrastructure equipment.
FAQ
What is the maximum operating temperature for SN74LVCHR16245ALR?
The SN74LVCHR16245ALR is rated for operation from –40°C to +85°C, as confirmed by its SSOP (DL) package qualification and Recommended Operating Conditions table. This range aligns with commercial and extended industrial applications but does not extend to the +125°C rating of TVSOP/TSSOP variants like SN74LVCHR16245AVR or SN74LVCHR16245AGR.
Does SN74LVCHR16245ALR support live insertion in powered backplanes?
Yes, SN74LVCHR16245ALR supports live insertion via its Ioff feature, which limits current flow to ±10 µA when VCC = 0 V and inputs/outputs are biased up to 5.5 V. This prevents damaging back-drive currents during hot-plug events in telecom and server chassis environments.
Can SN74LVCHR16245ALR translate 5-V signals to 1.8-V logic levels?
SN74LVCHR16245ALR accepts 5.5-V inputs at any valid VCC (1.65–3.6 V), enabling down-translation to 1.8-V systems. However, output swing is rail-to-rail (0 to VCC), so 1.8-V outputs require VCC = 1.8 V - verified in the Electrical Characteristics table with VOL = 0.4 V and VOH = 1.6 V at IOH = –4 mA.
How does the bus-hold function operate on SN74LVCHR16245ALR inputs?
The bus-hold circuitry on SN74LVCHR16245ALR actively maintains the last-valid logic state on unused data inputs using ±45 µA hold current (at VCC = 3 V), eliminating need for external pull-up/pull-down resistors. It remains active regardless of OE or DIR state and is intrinsic to all A/B port pins.
Is SN74LVCHR16245ALR pin-compatible with SN74LVC16245A?
Yes, SN74LVCHR16245ALR shares identical SSOP-48 pinout and terminal functions with SN74LVC16245A, including matching DIR, OE, A/B port, VCC, and GND locations. However, functional differences - notably bus-hold presence and 5.5-V input tolerance - require validation in target system timing and signal integrity analysis.
SN74LVCHR16245ALR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCHR
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74LVCHR16245ALR FAQ
1.How can I place an order for SN74LVCHR16245ALR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCHR16245ALR 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 SN74LVCHR16245ALR reliable?
The price and inventory of SN74LVCHR16245ALR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCHR16245ALR is usually 5 days.
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SN74LVCHR16245ALR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCHR16245ALR 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 SN74LVCHR16245ALR?
For technical support, including SN74LVCHR16245ALR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCHR16245ALR requirements.
6.How does Aetrix verify that SN74LVCHR16245ALR is sourced from the original manufacturer or authorized distributors?
All SN74LVCHR16245ALR 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 SN74LVCHR16245ALR meets industry standards.
7.What is the process for return or replacement of SN74LVCHR16245ALR?
All SN74LVCHR16245ALR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCHR16245ALR, 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 SN74LVCHR16245ALR part is unused and in its original packaging.
Return procedure for SN74LVCHR16245ALR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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