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Texas Instruments SN74ALVCH244PWRE4
- Part No.:
- SN74ALVCH244PWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ALVCH244PWRE4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,158
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Product details
Overview
SN74ALVCH244PWRE4 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 on all data inputs, ±24-mA output drive at 3.3 V, and 2.8-ns max propagation delay. It serves as a level-shifting and bus-isolation interface in low-voltage digital systems such as FPGA I/O expansion and microcontroller peripheral buffering.
For engineers reviewing the SN74ALVCH244PWRE4 datasheet, SN74ALVCH244PWRE4 pinout, SN74ALVCH244PWRE4 application, or SN74ALVCH244PWRE4 equivalent, key selection criteria include its dual 4-bit 3-state architecture, bus-hold functionality eliminating external resistors, 20-pin TSSOP (PW) package, and compatibility with mixed-voltage 1.8-V/2.5-V/3.3-V logic domains.
Technical Context
The SN74ALVCH244PWRE4 implements two independent 4-bit noninverting buffers, each controlled by a dedicated output-enable (OE) input. When OE is low, data passes from A inputs to Y outputs; when high, outputs enter high-impedance state - enabling bidirectional bus sharing without contention.
Its bus-hold circuitry actively maintains valid logic levels on undriven or floating inputs, eliminating need for external pullup/pulldown resistors. Input thresholds scale with VCC (e.g., VIH = 0.65×VCC at 1.65 V), supporting robust operation across 1.65–3.6 V supply range while maintaining TTL-compatible logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 3.6 V - enables interoperability across 1.8-V, 2.5-V, and 3.3-V logic families |
| Max Propagation Delay | 2.8 ns at 3.3 V - supports high-speed data transfer in timing-critical interfaces |
| Output Drive Strength | ±24 mA at 3.3 V - drives heavy capacitive loads and multiple CMOS inputs without signal degradation |
| Bus-Hold Current | ±45 µA at 2.3 V - actively sustains input logic state without external biasing components |
| Input Clamp Current | −50 mA - protects against transient overvoltage events per JESD 17 latch-up standard |
| ESD Protection | 2000-V HBM, 200-V MM - meets industrial-grade ESD immunity requirements |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environment deployment |
Pinout & Package
TSSOP-20 (PW) package: 6.5-mm × 4.4-mm body, 0.65-mm lead pitch, 1.2-mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent enable for each 4-bit channel; tie to VCC via pullup for power-up high-Z safety |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs with integrated bus-hold - no external resistors required |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Drive loads up to ±24 mA; high-impedance when corresponding OE is high |
| GND (Pin 10) | Ground reference | Common return path for all internal logic and output stages |
| VCC (Pin 11) | Power supply | Single-supply rail supporting 1.65–3.6 V; decoupling capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range (1.65–3.6 V) | Enables seamless voltage translation between 1.8-V, 2.5-V, and 3.3-V logic domains in mixed-supply systems |
| Integrated bus-hold circuitry | Eliminates need for 10-kΩ pullup/pulldown resistors on unused inputs - reduces BOM count and board space |
| Low propagation delay (2.8 ns) | Preserves signal integrity in high-frequency address/data buses up to ~350 MHz toggle rate |
| High-output drive (±24 mA) | Drives up to 10 LVTTL loads or 20 CMOS loads at 3.3 V - supports fanout-intensive applications |
| Robust ESD/latch-up protection | Exceeds JESD 22 (2000-V HBM) and JESD 17 (250-mA latch-up) - ensures reliability in handling and system integration |
Applications
| FPGA I/O Expansion | Microcontroller Peripheral Interface |
|---|---|
Use Scenario: Expanding limited GPIO count of Xilinx Artix-7 FPGA to drive 16-bit parallel LCD interface and SD card command lines. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer isolating FPGA core from external peripherals; enables time-multiplexed bus sharing. Use Value: Bus-hold prevents floating inputs during reconfiguration; ±24-mA drive ensures clean edges into 50-pF LCD segment traces. |
Use Scenario: Interfacing STM32H743ZI's 3.3-V GPIO bank to legacy 2.5-V sensor array and 1.8-V memory module. IC Role / Device Role / Timing Role: Voltage-level translator and bus isolator; separates domains while preserving timing margins. Use Value: 1.65–3.6-V operation allows direct connection to both 2.5-V and 1.8-V supplies; 2.8-ns tpd avoids setup/hold violations. |
| Industrial PLC Backplane Buffer | Test Equipment Signal Routing |
Use Scenario: Isolating CPU bus signals from noisy I/O modules in Allen-Bradley CompactLogix chassis. IC Role / Device Role / Timing Role: Noise-immune data repeater with high-Z disable during hot-swap insertion/removal. Use Value: −40°C to +85°C rating ensures stable operation; 2000-V HBM withstands field ESD events during maintenance. |
Use Scenario: Dynamic routing of 16-channel DUT signals through PXI-based ATE system using FPGA-controlled OE lines. IC Role / Device Role / Timing Role: Reconfigurable signal gate with sub-3-ns switching - enables precise test sequence timing. Use Value: Dual OE control allows independent channel gating; bus-hold prevents metastability during signal reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state 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 2.5 V); no bus-hold | Requires external pullups on unused inputs; less suitable for floating-bus environments | Preferred where cost sensitivity outweighs bus-hold requirement and VCC is fixed at 3.3 V |
| 74AVC244TTR | Wider VCC range (1.2–3.6 V); higher speed (1.9 ns tpd at 3.3 V); no bus-hold | Lacks bus-hold - mandates external biasing; optimized for ultra-low-voltage 1.2-V/1.5-V systems | Select when operating below 1.65 V or requiring <2-ns timing; add 10-kΩ resistors if inputs may float |
Compared with SN74LVC244APWR and 74AVC244TTR, the SN74ALVCH244PWRE4 uniquely combines bus-hold functionality, full 1.65–3.6-V operation, and guaranteed ±24-mA drive across that range - making it optimal for mixed-voltage industrial designs where input stability and layout simplicity are critical.
Availability
SN74ALVCH244PWRE4 is available at Aetrix Electronics and suitable for FPGA I/O expansion, microcontroller peripheral interfacing, and industrial PLC backplane buffering requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74ALVCH244PWRE4 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 decades of expertise in high-reliability interface ICs.
The SN74ALVCH244PWRE4 belongs to TI's ALVC/ALVCH advanced low-voltage CMOS logic family, engineered for low-power, high-speed bus interface applications in industrial, communications, and computing systems.
FAQ
What is the recommended power-up sequence for SN74ALVCH244PWRE4?
TI recommends tying both 1OE and 2OE to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp-up. This prevents bus contention before system initialization completes. The SN74ALVCH244PWRE4 does not require strict VCC sequencing relative to other rails since it operates within a single 1.65–3.6-V supply domain.
Does SN74ALVCH244PWRE4 support hot-swap operation?
Yes - the SN74ALVCH244PWRE4 supports hot-swap applications due to its bus-hold inputs and high-impedance outputs when OE is high. Its 2000-V HBM ESD rating and JESD 17–compliant latch-up immunity allow safe insertion/removal in live backplanes. However, OE must be asserted high before physical connection to avoid transient glitches.
Can SN74ALVCH244PWRE4 drive 5-V TTL inputs?
No - the SN74ALVCH244PWRE4 is not 5-V tolerant. Its absolute maximum VO is VCC + 0.5 V (max 4.1 V at 3.6 V supply), and VIH/VIL thresholds scale with VCC. Driving 5-V TTL requires level-shifting circuitry or a 5-V-tolerant buffer such as SN74LVC8T245. Direct connection risks damage and logic misinterpretation.
How does bus-hold functionality affect power consumption in SN74ALVCH244PWRE4?
Bus-hold adds ≤75 µA per input at 3 V (per datasheet II(hold)), increasing quiescent current slightly versus non-bus-hold variants. However, it eliminates external pullup resistors (typically 4.7–10 kΩ), reducing total system power in floating-input scenarios. Total ICC remains under 10 µA at VCC = 3.6 V with all inputs static.
Is SN74ALVCH244PWRE4 pin-compatible with SN74ALVC244PWR?
Yes - SN74ALVCH244PWRE4 and SN74ALVC244PWR share identical TSSOP-20 (PW) footprint, pinout, and function mapping. Both have 1OE/2OE controls and 1A/1Y/2A/2Y groupings. However, SN74ALVCH244PWRE4 includes bus-hold; SN74ALVC244PWR does not - requiring external biasing if inputs may float.
SN74ALVCH244PWRE4 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:
- Discontinued at Digi-Key
- 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
SN74ALVCH244PWRE4 FAQ
1.How can I place an order for SN74ALVCH244PWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVCH244PWRE4 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 SN74ALVCH244PWRE4 reliable?
The price and inventory of SN74ALVCH244PWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVCH244PWRE4 is usually 5 days.
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Once your SN74ALVCH244PWRE4 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 SN74ALVCH244PWRE4?
For technical support, including SN74ALVCH244PWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVCH244PWRE4 requirements.
6.How does Aetrix verify that SN74ALVCH244PWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ALVCH244PWRE4 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 SN74ALVCH244PWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ALVCH244PWRE4?
All SN74ALVCH244PWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVCH244PWRE4, 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 SN74ALVCH244PWRE4 part is unused and in its original packaging.
Return procedure for SN74ALVCH244PWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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