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Texas Instruments SN74ALVCH16973DGVR
- Part No.:
- SN74ALVCH16973DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 48-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ALVCH16973DGVR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 48TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ALVCH16973DGVR from Texas Instruments is an 8-bit bus transceiver with transparent D-type latch and four independent noninverting buffers, operating from 1.65 V to 3.6 V. It supports asynchronous bidirectional A↔B data transfer, latches address signals on Q outputs, and isolates buses via TOE/LOE controls. Used in demultiplexed address/data bus architectures for microprocessor systems.
For engineers reviewing the SN74ALVCH16973DGVR datasheet, SN74ALVCH16973DGVR pinout, SN74ALVCH16973DGVR application, or SN74ALVCH16973DGVR equivalent, key selection criteria include latch-enable timing (tsu/th = 0.9 ns), bus-hold inputs eliminating external resistors, ±24 mA drive strength at 3 V, and TSSOP-48 packaging compatible with high-density PCB layouts.
Technical Context
This device integrates three functional blocks in one monolithic IC: (1) an 8-bit noninverting transceiver with direction control (DIR) and transceiver output enable (TOE); (2) a transparent D-type latch with latch-enable (LE) and latch output-enable (LOE); and (3) four independent noninverting buffers (Y = D). All I/Os feature bus-hold circuitry, eliminating need for external pullup/pulldown resistors.
Logic operation is strictly level-sensitive: LE high enables transparent latch behavior; LE low freezes Q outputs; TOE high disables A/B transceiver paths; LOE high places Q outputs in high-impedance state without affecting internal latch state. Control inputs (DIR, TOE, LE, LOE) are CMOS-compatible and require static biasing to VCC or GND for reliable startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports mixed-voltage system interfacing (e.g., 1.8 V core ↔ 3.3 V I/O) |
| IOH/IOL Drive | ±24 mA at VCC = 3 V - sufficient to drive 50 Ω transmission lines or multiple CMOS loads without buffering |
| tpd Propagation | ≤3.3 ns at VCC = 3.3 V - enables sub-300 MHz bus operation with tight timing margins |
| tsu/th Setup/Hold | 0.9 ns each at all VCC - minimal data setup required before LE falling edge, easing timing closure |
| Bus-Hold Current | ±75 µA at VIH min/VIL max - actively holds floating inputs at valid logic levels, preventing metastability |
| Power Dissipation | Cpd = 19 pF per output at 3.3 V - predicts dynamic power consumption for clocked switching analysis |
| ESD Rating | 2000-V HBM - exceeds JEDEC JESD22-A114, enabling robust handling in automated assembly |
Pinout & Package
TSSOP-48 package (DGV), 12.6 mm × 6.2 mm × 1.2 mm max height, lead pitch 0.5 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 48 | A1, B8 | Transceiver I/O port A and B - bidirectional data path controlled by DIR and TOE |
| 2–9, 40–47 | A2–A8, B1–B7 | Additional A/B transceiver I/Os - collectively form 8-bit A↔B bus interface |
| 10–17 | Q1–Q8 | Latched output bus - driven by A inputs when LE is high; held when LE is low |
| 18–21 | D1–D4 | Independent buffer inputs - Y outputs follow D regardless of DIR/TOE/LE/LOE states |
| 22–25 | Y1–Y4 | Buffer outputs - noninverting replication of D1–D4, isolated from transceiver/latch logic |
| 26, 27 | LE, LOE | Latch-enable and latch-output-enable - LE controls Q transparency; LOE controls Q high-Z state |
| 28, 29 | DIR, TOE | Direction and transceiver-enable - DIR sets A→B or B→A flow; TOE disables A/B paths entirely |
| 30–39, 41, 42, 44, 45 | GND, VCC | Power terminals - eight GND and six VCC pins distributed for low-noise, low-impedance supply routing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bus-hold on all I/Os | Eliminates external pullup/pulldown resistors, reducing BOM count and board area in unterminated stub applications |
| Three independent control domains | TOE isolates A/B buses without affecting latch state; LOE places Q outputs in high-Z without altering stored data |
| Four dedicated noninverting buffers | Operate concurrently with transceiver/latch functions, enabling simultaneous signal routing and bus conditioning |
| Low-threshold CMOS inputs | VIH min = 0.65×VCC (1.65 V range) - ensures reliable logic detection across full supply range |
| High-speed latch timing | 0.9 ns setup/hold at LE input - supports latch strobing synchronized to fast clock edges in address capture circuits |
Applications
| Microprocessor Address Latching | Memory Bus Demultiplexing |
|---|---|
Use Scenario: Capturing and holding CPU address bus during multiplexed AD cycle in legacy x86 or ARM9 systems. IC Role / Device Role / Timing Role: SN74ALVCH16973DGVR acts as address latch and bus isolator - LE samples A[0:7], Q[0:7] holds address while data transfers on same bus. Use Value: Eliminates need for separate latch + transceiver ICs, reducing component count and interconnect delay in 8-bit address path. | Use Scenario: Separating shared address/data bus into dedicated address and data paths for SRAM or Flash memory interface. IC Role / Device Role / Timing Role: SN74ALVCH16973DGVR serves as bus demux - A-side connects to CPU, B-side to memory data lines, Q-side to memory address lines. Use Value: Enables concurrent address setup and data transfer using single-cycle LE strobe, improving memory access throughput. |
| FPGA I/O Expansion | Industrial Control Backplane Interface |
Use Scenario: Extending limited FPGA I/O pins to drive multiple peripheral buses with independent timing control. IC Role / Device Role / Timing Role: SN74ALVCH16973DGVR functions as configurable I/O hub - buffers expand control signals (D→Y), latches configure register addresses (A→Q), transceivers route data (A↔B). Use Value: Allows single FPGA pin to manage three distinct signal domains with no external glue logic or timing constraints. | Use Scenario: Interfacing PLC CPU module to field I/O modules over parallel backplane with noise-prone long traces. IC Role / Device Role / Timing Role: SN74ALVCH16973DGVR operates as robust bus repeater - TOE isolates faulty segments; bus-hold prevents floating inputs during hot-swap events. Use Value: Maintains signal integrity across 10+ cm backplane runs without termination resistors, reducing EMI susceptibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver and latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245ADGGR | Octal transceiver only - no latch or buffers; 32-pin TSSOP; lower drive (±24 mA @ 3.3 V but no 1.65 V support) | Requires external latch for address capture; unsuitable for 1.65 V systems | Select when only bidirectional data routing is needed and latch functionality is implemented elsewhere |
| SN74ALVCH162244DLR | 16-bit buffer only - no transceiver or latch; 48-pin SSOP; identical voltage range and bus-hold | Cannot perform A↔B data transfer or store address state; lacks DIR/TOE/LE/LOE controls | Select when signal conditioning and fanout expansion are primary needs, not bus arbitration or latching |
Compared with SN74ALVCH16973DGVR, SN74LVC16245ADGGR offers simpler transceiver-only operation but requires additional components for latching, while SN74ALVCH162244DLR provides higher channel count buffering without bidirectional or storage capability - choice depends on whether integrated latch+transceiver+buffer functionality is mandatory for the system architecture.
Availability
SN74ALVCH16973DGVR is available at Aetrix Electronics and suitable for microprocessor address latching, memory bus demultiplexing, FPGA I/O expansion, and industrial control backplane interface requiring stable component supply across extended temperature ranges.
Supply support for SN74ALVCH16973DGVR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The SN74ALVCH16973DGVR belongs to TI's Widebus™ family of advanced bus-interface devices, designed specifically for high-speed, low-voltage, multi-function bus management in space-constrained embedded systems.
FAQ
What is the minimum VCC voltage required for reliable operation of the SN74ALVCH16973DGVR?
The SN74ALVCH16973DGVR is fully specified from 1.65 V to 3.6 V. At VCC = 1.65 V, it guarantees VIH(min) = 1.07 V, VOL(max) = 0.45 V, and tpd ≤ 3.2 ns. Operation below 1.65 V is not characterized and may result in undefined logic states or increased static current - always maintain VCC within the recommended range for SN74ALVCH16973DGVR.
How does the bus-hold feature on the SN74ALVCH16973DGVR eliminate need for external resistors?
The SN74ALVCH16973DGVR integrates active bus-hold circuitry on all A, B, and D inputs, sourcing or sinking up to ±75 µA to maintain last-valid logic level when inputs float. This eliminates external pullup/pulldown resistors, reducing BOM cost and PCB area - confirmed by TI's SCES435B datasheet section "Bus-Hold Circuitry" for SN74ALVCH16973DGVR.
Can the SN74ALVCH16973DGVR simultaneously drive its Q outputs and operate the A↔B transceiver?
No - the SN74ALVCH16973DGVR cannot drive Q outputs and enable A↔B transceiver paths concurrently. When TOE is low (transceiver enabled), the A and B ports are active; when TOE is high, they enter high-impedance state. Q outputs are controlled independently by LOE, but physical I/O resources are partitioned: Q is latched output only, while A/B are bidirectional transceiver ports - no shared drivers exist in SN74ALVCH16973DGVR.
What is the maximum data rate supported by the SN74ALVCH16973DGVR in transceiver mode?
Based on tpd ≤ 3.3 ns and setup/hold times of 0.9 ns, the SN74ALVCH16973DGVR supports reliable operation up to approximately 150 MHz in transceiver mode (cycle time ≥ 6.7 ns). This assumes clean signal integrity, matched trace lengths, and proper termination - actual maximum rate depends on system-level timing margins and layout, as documented in the SN74ALVCH16973DGVR switching characteristics table.
Is the SN74ALVCH16973DGVR pin-compatible with other devices in the ALVCH16xxx series?
No - the SN74ALVCH16973DGVR has a unique 48-pin TSSOP (DGV) pinout optimized for its combined transceiver+latch+buffer function. Devices like SN74ALVCH162244 (buffer-only) or SN74ALVCH16245 (transceiver-only) use different pin assignments for control signals (e.g., OE vs TOE/LOE) and lack LE/DIR/LOE pins entirely - direct PCB replacement is not possible without redesign for SN74ALVCH16973DGVR.
SN74ALVCH16973DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 48-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- Push-Pull
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TVSOP
SN74ALVCH16973DGVR FAQ
1.How can I place an order for SN74ALVCH16973DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH16973DGVR 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 SN74ALVCH16973DGVR reliable?
The price and inventory of SN74ALVCH16973DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH16973DGVR is usually 5 days.
3.What payment methods are accepted for SN74ALVCH16973DGVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH16973DGVR transactions.
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4.How is shipping managed for SN74ALVCH16973DGVR?
SN74ALVCH16973DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH16973DGVR 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 SN74ALVCH16973DGVR?
For technical support, including SN74ALVCH16973DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH16973DGVR requirements.
6.How does Aetrix verify that SN74ALVCH16973DGVR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH16973DGVR 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 SN74ALVCH16973DGVR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH16973DGVR?
All SN74ALVCH16973DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH16973DGVR, 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 SN74ALVCH16973DGVR part is unused and in its original packaging.
Return procedure for SN74ALVCH16973DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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