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Texas Instruments SN74ALVCH162344DLR
- Part No.:
- SN74ALVCH162344DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74ALVCH162344DLR.pdf
- Description:
- IC ADDRESS DRIVER 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74ALVCH162344DLR from Texas Instruments is a 1-bit-to-4-bit address driver with 3-state outputs, designed for memory address expansion in 1.65-V to 3.6-V systems. It features ±12-mA drive strength at 3.3 V, integrated 26-Ω series output resistors, bus-hold on all data inputs, and four independent OE controls (OE1–OE4) for bank-selectable output enable/disable. Used in multi-bank memory subsystems where a single address line selects one of four physical memory locations.
For engineers reviewing the SN74ALVCH162344DLR datasheet, SN74ALVCH162344DLR pinout, SN74ALVCH162344DLR application, or SN74ALVCH162344DLR equivalent, key selection criteria include voltage range compatibility (1.65–3.6 V), 4.4-ns max propagation delay at 3.3 V, 56-pin SSOP package footprint, bus-hold input retention, and per-bank 3-state control for memory address demultiplexing.
Technical Context
The SN74ALVCH162344DLR implements eight independent 1-bit-to-4-bit address translation channels (A1–A8 → B1–B4 per bank), each with dedicated output-enable (OE1–OE4) control. Each channel drives four outputs simultaneously with matched timing and integrated series termination.
It operates across the full 1.65–3.6-V supply range with rail-to-rail input thresholds (VIH/VIL scaling with VCC), supports hot-insertion via Ioff protection, and meets JESD 17 latch-up immunity (>250 mA). Bus-hold circuitry actively maintains logic state on undriven inputs without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables interoperability across mixed-voltage 1.8-V/2.5-V/3.3-V memory interfaces. |
| Max Propagation Delay | 4.4 ns at 3.3 V - Supports high-speed address decoding in DDR SDRAM and SRAM systems up to ~200 MHz clock domains. |
| Output Drive | ±12 mA at 3.3 V - Sufficient to directly drive four parallel CMOS loads without external buffers. |
| Integrated Series Resistor | 26 Ω per output - Reduces signal overshoot/undershoot; eliminates need for discrete series termination resistors. |
| Bus-Hold Current | ±25 µA to ±75 µA (VCC-dependent) - Maintains valid logic level on floating address/data lines during power-up or bus contention. |
| Input Capacitance | 3.5 pF - Minimizes loading on upstream address generators and preserves signal integrity in dense PCB layouts. |
| Operating Temperature | -40°C to +85°C - Qualified for industrial-grade embedded memory controllers and telecom baseband modules. |
Pinout & Package
SN74ALVCH162344DLR is packaged in a 56-pin SSOP (DL) with 0.5-mm pitch, 13.9-mm × 7.9-mm body, and 1.2-mm max height. Pin 1 is located at top-left corner with notch marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A–8A | Address Input | Eight independent 1-bit address inputs, each routed to its corresponding 4-bit output bank. |
| 1B1–1B4, ..., 8B1–8B4 | Banked Output | 32 total outputs grouped into eight banks of four; each bank driven by one A input and controlled by one OE. |
| OE1–OE4 | Output Enable | Four active-low enables controlling groups of two banks (OE1→Banks 1&2, OE2→Banks 3&4, etc.). |
| VCC (Pins 7, 22, 40, 49) | Power Supply | Four distributed VCC pins minimize IR drop and improve noise immunity across wide die layout. |
| GND (Pins 4, 11, 18, 25, 32, 39, 46, 53) | Ground | Eight GND pins provide low-inductance return paths for all 32 outputs and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Widebus™ Architecture | Optimized for high-density memory address routing with minimized skew (<0.5 ns between banks) and matched propagation delays. |
| Rail-to-Rail Input Thresholds | VIH/VIL scale dynamically with VCC (e.g., VIH = 0.65×VCC at 1.65 V), ensuring reliable switching across entire supply range. |
| Hot-Insertion Support | Ioff protection limits off-state current to ±10 µA when VCC = 0 V, enabling safe insertion into live backplanes. |
| Low Dynamic Power | ICC = 40 µA typical at 3.6 V with all inputs static - reduces quiescent power in always-on memory controller subsystems. |
| ESD Protection | ±2000 V HBM - meets JEDEC JS-001 requirements for robust handling in automated assembly environments. |
Applications
| Memory Address Expansion | Industrial PLC Memory Mapping |
|---|---|
Use Scenario: Expanding a 16-bit microcontroller address bus to access four separate 1-MB SRAM banks using only one address line per bank. IC Role / Device Role / Timing Role: Translates each A-line into four parallel B-lines per bank while maintaining sub-5-ns timing alignment across all outputs. Use Value: Eliminates need for discrete logic or CPLDs in address decoding, reducing BOM count and PCB area by >30% versus gate-based solutions. | Use Scenario: Isolating memory regions in programmable logic controller firmware updates, where different code segments reside in distinct flash banks. IC Role / Device Role / Timing Role: Provides bank-selectable 3-state isolation so only one flash bank is enabled during read/write cycles, preventing bus contention. Use Value: Enables atomic firmware swaps with zero risk of simultaneous access to multiple flash banks, improving system reliability during field upgrades. |
| DDR SDRAM Row Address Multiplexing | Telecom Baseband Memory Arbitration |
Use Scenario: Driving row-address signals to dual-rank DDR SDRAM modules where rank selection requires independent 4-bit address routing. IC Role / Device Role / Timing Role: Delivers matched-delay, terminated outputs to meet DDR setup/hold windows under 1.8-V operation. Use Value: Achieves <100-ps inter-output skew within bank, satisfying JEDEC DDR2/3 tAC timing margins without external tuning. | Use Scenario: Managing shared memory access between DSP cores and FPGA accelerators in wireless baseband units with strict latency budgets. IC Role / Device Role / Timing Role: Acts as configurable address router with per-bank OE control, allowing dynamic reassignment of memory regions between processing units. Use Value: Reduces arbitration logic complexity by 75%, enabling real-time memory partitioning without software intervention or cache coherency overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar address driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALVCH162344GR | TSSOP-56 package (DGG), same electrical specs, 2000-piece tape-and-reel vs. DL's 20-piece tube. | Better suited for high-volume SMT production due to smaller footprint (12.0 mm × 6.1 mm) and standard reel packaging. | Select GR for automated assembly; DLR remains optimal for prototyping and low-volume builds requiring SSOP compatibility. |
| SN74LVC162344DGGR | Lower drive (±24 mA), no bus-hold, wider VCC range (1.65–5.5 V), same pinout and function. | Required where 5-V tolerant I/O or higher current is needed, but sacrifices bus-hold protection and adds external pullup requirement. | Choose LVC variant only if interfacing with 5-V peripherals; ALVCH retains superior noise immunity and simplified design in pure 3.3-V systems. |
Compared with SN74ALVCH162344GR and SN74LVC162344DGGR, the SN74ALVCH162344DLR offers identical core functionality in SSOP packaging with built-in bus-hold and optimized 3.3-V performance-making it ideal for industrial designs prioritizing layout simplicity, ESD robustness, and legacy SSOP footprint reuse.
Availability
SN74ALVCH162344DLR is available at Aetrix Electronics and suitable for industrial control systems, telecom baseband modules, and embedded memory expansion applications requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALVCH162344DLR 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 technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ALVCH162344DLR belongs to TI's Widebus™ family of high-speed address and data interface ICs, engineered specifically for low-skew, low-power memory subsystem expansion in space-constrained industrial and telecom equipment.
FAQ
What is the recommended power-up sequence for SN74ALVCH162344DLR?
TI recommends tying all OE inputs to VCC through a pullup resistor (minimum value determined by driver sink capability) during power-up to ensure outputs remain in high-impedance state until system initialization completes. The SN74ALVCH162344DLR does not require strict VCC ramp sequencing, but VCC must stabilize before applying input signals. This prevents bus contention and ensures deterministic startup behavior in memory-mapped systems using the SN74ALVCH162344DLR.
Does SN74ALVCH162344DLR support hot-swap operation?
Yes, the SN74ALVCH162344DLR supports hot-swap via Ioff circuitry that limits off-state current to ±10 µA when VCC = 0 V. This allows safe insertion into live backplanes without disrupting other components. However, OE pins must be held inactive (high) during insertion, and bus-hold is disabled when VCC is unpowered-so external pullups may be needed for signal integrity during partial power conditions. The SN74ALVCH162344DLR's design meets JEDEC JESD78 Class II latch-up immunity, further enhancing hot-swap robustness.
Can SN74ALVCH162344DLR replace older 74-series address drivers like SN74LS253?
No, the SN74ALVCH162344DLR is not a functional or pin-compatible replacement for SN74LS253. It is a 1-bit-to-4-bit address driver with 32 outputs and four OE controls, whereas SN74LS253 is a dual 4-line-to-1-line data selector/multiplexer. They differ in architecture, pinout, voltage range (LS: 4.75–5.25 V only), and logic function. The SN74ALVCH162344DLR serves modern low-voltage memory expansion-not legacy TTL multiplexing-and requires redesign of both schematic and layout if migrating from LS-family parts.
How does bus-hold work on SN74ALVCH162344DLR inputs, and when should it be disabled?
Bus-hold on SN74ALVCH162344DLR uses weak feedback transistors to maintain the last-valid logic state on undriven inputs, eliminating need for external pullups/pulldowns. It draws ±25 µA to ±75 µA depending on VCC and input voltage. TI advises disabling bus-hold only when driving inputs with slow-rising signals (<10 ns/V) or when interfacing with open-drain sources, as it may interfere with proper level detection. For standard CMOS address buses, bus-hold remains enabled by default and improves system reliability in the SN74ALVCH162344DLR.
What is the thermal resistance (θJA) of the SN74ALVCH162344DLR in its SSOP package?
The SN74ALVCH162344DLR in the DL (SSOP-56) package has a junction-to-ambient thermal resistance (θJA) of 56°C/W, measured per JESD 51-7 under standard JEDEC test board conditions. This value assumes 1-inch² copper pad with two internal layers. In compact industrial PCBs with limited copper area, actual θJA may rise to 70–80°C/W-so derating is required above 65°C ambient. TI provides thermal simulation models for the SN74ALVCH162344DLR to support accurate junction temperature calculation in real-world layouts.
SN74ALVCH162344DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Address Driver
- Number of Elements:
- 4
- Number of Bits per Element:
- 2:8
- 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:
- 56-SSOP
SN74ALVCH162344DLR FAQ
1.How can I place an order for SN74ALVCH162344DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH162344DLR 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 SN74ALVCH162344DLR reliable?
The price and inventory of SN74ALVCH162344DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH162344DLR is usually 5 days.
3.What payment methods are accepted for SN74ALVCH162344DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVCH162344DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVCH162344DLR?
SN74ALVCH162344DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH162344DLR 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 SN74ALVCH162344DLR?
For technical support, including SN74ALVCH162344DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH162344DLR requirements.
6.How does Aetrix verify that SN74ALVCH162344DLR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH162344DLR 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 SN74ALVCH162344DLR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH162344DLR?
All SN74ALVCH162344DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH162344DLR, 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 SN74ALVCH162344DLR part is unused and in its original packaging.
Return procedure for SN74ALVCH162344DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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