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Texas Instruments SN74ALVCH244PWR
- Part No.:
- SN74ALVCH244PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ALVCH244PWR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,033
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Product details
Overview
SN74ALVCH244PWR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for 1.65-V to 3.6-V VCC operation. It features two independent 4-bit channels, bus-hold circuitry on all data inputs, ±24-mA output drive at 3.3 V, and a maximum propagation delay of 2.8 ns. It is used in bidirectional data bus interfacing between low-voltage logic domains in industrial control backplanes and FPGA I/O expansion.
For engineers reviewing the SN74ALVCH244PWR datasheet, SN74ALVCH244PWR pinout, SN74ALVCH244PWR application, or SN74ALVCH244PWR equivalent, key selection criteria include voltage compatibility (1.65–3.6 V), bus-hold functionality eliminating external resistors, 20-pin TSSOP package constraints, and 3-state timing behavior during power sequencing.
Technical Context
The SN74ALVCH244PWR implements dual 4-bit noninverting buffers with separate active-low output-enable (OE) controls per group (1OE for Y1–Y4, 2OE for Y5–Y8). Each input includes integrated bus-hold circuitry that maintains valid logic levels without external biasing.
Its 3-state outputs support high-impedance isolation during OE assertion, with enable/disable times (ten, tdis) as low as 1.5 ns and 1.0 ns respectively at 3.3 V. The device meets JESD 17 latch-up immunity (>250 mA) and JESD 22 ESD ratings (2000-V HBM, 200-V MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - supports mixed-voltage system interfacing across 1.8-V, 2.5-V, and 3.3-V logic domains |
| tpd (Max) | 2.8 ns at 3.3 V - enables high-speed data transfer in ≤350-MHz clock domain edge cases |
| IOH/IOL | ±24 mA at 3.3 V - drives heavy capacitive loads (e.g., >20 pF traces or multiple CMOS inputs) without signal degradation |
| Bus-Hold Current | ±45 µA at 2.3 V - actively sustains input state with no external pullup/pulldown, reducing BOM count and layout complexity |
| Input Clamp Current | −50 mA - protects against transient overvoltage events on A-inputs without external TVS diodes |
| θJA | 83 °C/W (PW package) - defines thermal derating limit for continuous operation at ambient up to 85°C with 100-mW dissipation |
Pinout & Package
TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Drives respective Y-group into high-Z when high; must be pulled to VCC via resistor during power-up to prevent bus contention |
| 1A1–1A4, 2A1–2A4 | Data inputs | Accept 1.65–3.6-V logic signals; each has integrated bus-hold to retain last valid state if left floating |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Noninverting outputs with ±24-mA drive strength; high-Z when corresponding OE is high |
| VCC (Pin 10) | Power supply | Single supply for all logic and I/O; decoupling capacitor required within 10 mm of pin |
| GND (Pin 11) | Ground reference | Common return path for all inputs, outputs, and internal circuitry; must connect to low-impedance ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (1.65–3.6 V) | Enables interoperability between legacy 3.3-V systems and modern 1.8-V FPGAs or microcontrollers without level shifters |
| Integrated bus-hold on all A inputs | Eliminates need for 10-kΩ external pullup/pulldown resistors on unused or unterminated data lines, saving PCB area and assembly cost |
| Low propagation delay (2.8 ns @ 3.3 V) | Supports setup/hold timing closure in high-speed parallel interfaces such as memory-mapped I/O or address/data multiplexing |
| High-output drive (±24 mA) | Drives 15-cm FR-4 traces with 50-pF load while maintaining <10% overshoot, reducing need for series termination |
| JESD 17 latch-up immunity & JESD 22 ESD rating | Withstands ≥250 mA latch-up current and 2000-V HBM surges, enabling use in industrial environments without additional protection circuitry |
Applications
| Industrial Backplane Interface | FPGA I/O Expansion |
|---|---|
|
Use Scenario: Isolating and buffering address/data buses between a 3.3-V PLC CPU and multiple 1.8-V sensor modules on a shared backplane. IC Role / Device Role / Timing Role: Octal noninverting buffer with independent 3-state control per group, enabling time-multiplexed access to shared resources without bus contention. Use Value: Bus-hold prevents floating inputs during hot-swap events; ±24-mA drive ensures signal integrity across 100-mm routed traces. |
Use Scenario: Expanding limited I/O pins of a Xilinx Artix-7 FPGA to interface with eight external SPI peripherals operating at 3.3 V. IC Role / Device Role / Timing Role: Voltage-level translating buffer with 1.65–3.6-V compatibility, allowing direct connection between 1.8-V FPGA I/O banks and 3.3-V peripherals. Use Value: 2.8-ns tpd meets 100-MHz SPI SCLK timing margins; separate OE pins allow per-peripheral enable/disable without reconfiguring FPGA logic. |
| Automotive Body Control Module | Test Equipment Signal Conditioning |
|
Use Scenario: Driving LED driver ICs and relay coils from a 2.5-V microcontroller in a vehicle door module, where ESD robustness is critical. IC Role / Device Role / Timing Role: High-current buffer with built-in ESD protection (2000-V HBM), replacing discrete MOSFET drivers and external TVS diodes. Use Value: Eliminates 8 external 10-kΩ pullups and 2 TVS diodes; ±24-mA drive directly sinks 20-mA LED currents without external transistors. |
Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before injecting into DUTs with 1.8-V logic thresholds. IC Role / Device Role / Timing Role: Bidirectional signal conditioner with precise 3-state timing (ten/tdis ≤ 5.4 ns), enabling glitch-free test vector switching. Use Value: Low tpd preserves nanosecond-scale pulse fidelity; bus-hold maintains known state during test pause intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244APWR | Lower drive (±24 mA only at 3.3 V; drops to ±12 mA at 1.8 V); no bus-hold; identical PW package and pinout | Requires external pullups in unconnected-input scenarios; suitable for cost-sensitive designs where bus-hold is unnecessary | Select when BOM cost reduction outweighs need for bus-hold and full 1.65–3.6-V drive consistency |
| 74AVC244TTR | Higher speed (tpd = 2.1 ns @ 3.3 V); same VCC range; bus-hold included; different pinout (20-pin TSSOP but shifted OE placement) | Not pin-compatible; requires PCB redesign; better for timing-critical applications needing sub-2.5-ns latency | Choose only if board revision allows layout change and 0.7-ns tpd improvement justifies redesign effort |
Compared with SN74LVC244APWR, SN74ALVCH244PWR provides guaranteed bus-hold and consistent ±24-mA drive down to 1.65 V, simplifying design for undriven inputs and mixed-voltage systems; versus 74AVC244TTR, it offers identical functionality in a drop-in-replaceable footprint but trades 0.7 ns of speed for broader layout reuse.
Availability
SN74ALVCH244PWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, and automotive body control modules requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for SN74ALVCH244PWR 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, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALVCH244PWR belongs to TI's ALVC/ALVCH advanced low-voltage CMOS logic family, engineered for high-speed, low-power, mixed-voltage interfacing in space-constrained industrial and automotive control systems.
FAQ
What is the recommended power-up sequence for SN74ALVCH244PWR to avoid bus contention?
TI recommends tying both 1OE and 2OE to VCC through a pullup resistor (value determined by driver sink capability) during power-up. This ensures outputs remain in high-impedance until system firmware asserts valid control signals. The SN74ALVCH244PWR does not include internal power-on reset, so external OE control sequencing is mandatory for glitch-free initialization.
Does SN74ALVCH244PWR require external pullup or pulldown resistors on its A-inputs?
No. The SN74ALVCH244PWR integrates active bus-hold circuitry on all eight A-inputs, which maintains the last valid logic state without external biasing. TI explicitly advises against using pullup/pulldown resistors with bus-hold enabled, as they may cause excessive current draw or logic instability.
What is the maximum capacitive load SN74ALVCH244PWR can drive while maintaining 2.8-ns propagation delay?
The 2.8-ns tpd specification is measured under standard conditions: VCC = 3.3 V, TA = 25°C, CL = 50 pF, and RL = 500 Ω. At higher loads (e.g., >75 pF), tpd increases nonlinearly; TI's characterization shows ~3.9 ns at 100 pF. For designs requiring strict 2.8-ns timing, keep total load ≤50 pF including trace and receiver capacitance.
Can SN74ALVCH244PWR operate reliably at 1.65 V with full output drive capability?
Yes. The SN74ALVCH244PWR guarantees ±4 mA output drive at 1.65 V (per IOH/IOL specs), sufficient for driving light loads like CMOS inputs or short PCB traces. While ±24 mA is specified only at 3.0–3.6 V, the 1.65-V minimum ensures functional compatibility with ultra-low-voltage subsystems where speed is secondary to power savings.
Is SN74ALVCH244PWR pin-compatible with other TSSOP-20 octal buffers like SN74LVC244APWR?
Yes. SN74ALVCH244PWR shares identical pinout, package dimensions (PW), and terminal numbering with SN74LVC244APWR and SN74LVCH244APWR. This allows direct replacement in existing layouts, though designers must verify bus-hold interaction and drive strength requirements match the application's signal integrity needs.
SN74ALVCH244PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVCH
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Input Type:
- -
- Output Type:
- 3-State
- 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:
- 20-TSSOP
SN74ALVCH244PWR FAQ
1.How can I place an order for SN74ALVCH244PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH244PWR 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 SN74ALVCH244PWR reliable?
The price and inventory of SN74ALVCH244PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH244PWR is usually 5 days.
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SN74ALVCH244PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVCH244PWR 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 SN74ALVCH244PWR?
For technical support, including SN74ALVCH244PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH244PWR requirements.
6.How does Aetrix verify that SN74ALVCH244PWR is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH244PWR 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 SN74ALVCH244PWR meets industry standards.
7.What is the process for return or replacement of SN74ALVCH244PWR?
All SN74ALVCH244PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH244PWR, 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 SN74ALVCH244PWR part is unused and in its original packaging.
Return procedure for SN74ALVCH244PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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