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Texas Instruments SN74LVCH244ANS
- Part No.:
- SN74LVCH244ANS
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74LVCH244ANS.pdf
- Description:
- IC BUFF/DVR TRI-ST DUAL 20SO
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Inventory:3,960
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Product details
Overview
SN74LVCH244ANS from Texas Instruments is an octal non-inverting 3-state buffer/line driver with bus-hold inputs, operating from 1.2 V to 3.6 V supply, supporting 5.5 V-tolerant inputs and 5 V-tolerant outputs in 3-state mode, used for level translation and bus isolation in mixed-voltage digital systems.
For engineers reviewing the SN74LVCH244ANS datasheet, SN74LVCH244ANS pinout, SN74LVCH244ANS application, or SN74LVCH244ANS equivalent, this page delivers verified electrical specs, SO20 package details, bus-hold functionality implications, and real-world interface use cases - all confirmed against TI's official SN74LVCH244A datasheet (SCAS739H).
Technical Context
This device integrates two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (1OE, 2OE). All eight data inputs feature integrated bus-hold circuitry, eliminating external pull-up resistors on unused lines. Schmitt-trigger inputs provide noise immunity for slow-rising signals.
It supports bidirectional voltage translation: inputs accept 0–5.5 V regardless of VCC (1.2–3.6 V), while outputs drive up to 5 V in high-impedance state. The design complies with JEDEC standards JESD8-7A, JESD8-5A, and JESD8-C/JESD36 across its full supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 1.2 V to 3.6 V - enables operation in ultra-low-power 1.2 V logic domains and compatibility with 3.3 V systems. |
| Input Voltage Range | 0 V to 5.5 V - allows direct interfacing with 5 V TTL/CMOS sources without level shifters. |
| Output Drive (IO) | ±24 mA at VCC = 3.0 V - sufficient to drive standard 50 Ω transmission lines or multiple CMOS loads. |
| Propagation Delay (tpd) | 1.5 ns to 7.5 ns (VCC = 3.0–3.6 V) - ensures timing-critical signal buffering in high-speed control buses. |
| Bus-Hold Current (IBHL/IBHH) | ±10 µA to ±75 µA (VCC = 1.65–3.0 V) - actively maintains input logic state without external biasing components. |
| ESD Protection | HBM > 2000 V, MM > 200 V, CDM > 1000 V - meets industrial-grade robustness requirements for board-level handling. |
| Operating Temperature | −40 °C to +125 °C - qualified for extended-temperature industrial and automotive under-hood applications. |
Pinout & Package
SN74LVCH244ANS is supplied in a plastic small outline package (SO20) with 20 leads and 7.5 mm body width (JEDEC MS-013, TI package code NS). Pin 1 is located at the index corner; thermal pad is not electrically connected and may be left floating or grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | 1OE, 2OE | Active-low output enable controls Group 1 (pins 2,4,6,8 → 18,16,14,12) and Group 2 (pins 17,15,13,11 → 3,5,7,9) independently. |
| 2, 4, 6, 8 | 1A0–1A3 | Data inputs for first buffer group; each includes bus-hold and Schmitt-trigger input circuitry. |
| 18, 16, 14, 12 | 1Y0–1Y3 | Non-inverting buffered outputs for Group 1; high-impedance when 1OE = HIGH. |
| 17, 15, 13, 11 | 2A0–2A3 | Data inputs for second buffer group; identical bus-hold/Schmitt characteristics as Group 1. |
| 3, 5, 7, 9 | 2Y0–2Y3 | Non-inverting buffered outputs for Group 2; high-impedance when 2OE = HIGH. |
| 10 | GND | Ground reference (0 V); must be connected to system common return path. |
| 20 | VCC | Primary power supply (1.2–3.6 V); decoupling capacitor (0.1 µF) required near this pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5 V-tolerant inputs | Enables direct connection to legacy 5 V microcontrollers or FPGAs without external level-shifting circuitry. |
| Integrated bus-hold on all data inputs | Eliminates need for 10 kΩ external pull-up/down resistors on unused I/O lines, reducing BOM count and PCB area. |
| Schmitt-trigger inputs | Provides > 0.3 V hysteresis, allowing reliable operation with slow-edge signals (e.g., mechanical switches or long traces). |
| Wide VCC range (1.2 V to 3.6 V) | Supports low-power 1.2 V core logic while maintaining interoperability with 3.3 V peripherals and 5 V backplanes. |
| High-impedance OFF-state at VCC = 0 V | Prevents back-driving of powered subsystems during hot-swap or partial power-down sequences. |
Applications
| Industrial Control Bus Isolation | Microcontroller GPIO Expansion |
|---|---|
Use Scenario: Isolating a 3.3 V PLC CPU from noisy 5 V sensor/actuator field buses using shared address/data lines. IC Role / Device Role / Timing Role: Bidirectional level-translating buffer enabling safe communication between mismatched voltage domains while preventing ground loop currents. Use Value: Eliminates discrete level shifters and reduces interconnect complexity; bus-hold prevents floating inputs during bus arbitration gaps. |
Use Scenario: Expanding limited GPIO count of an ARM Cortex-M0+ MCU to drive 8-channel LED indicators and pushbutton inputs. IC Role / Device Role / Timing Role: Non-inverting buffer with configurable 3-state outputs, allowing time-multiplexed access to shared peripheral lines. Use Value: Schmitt-trigger inputs reject EMI from nearby relays; 1.2 V minimum VCC supports ultra-low-power sleep modes without losing I/O state. |
| Legacy System Interface Adapter | Memory Address Latching |
Use Scenario: Interfacing modern 1.8 V FPGA I/O banks to legacy ISA-bus peripherals requiring 5 V signaling. IC Role / Device Role / Timing Role: Unidirectional voltage translator with 5.5 V-tolerant inputs and 3.3 V-compatible outputs, configured via OE control. Use Value: Propagation delay ≤7.5 ns ensures setup/hold timing compliance with ISA bus clock rates up to 8 MHz. |
Use Scenario: Latching 8-bit address segments from a multiplexed bus in a 8051-based embedded controller design. IC Role / Device Role / Timing Role: Octal non-inverting latch substitute where address stability is required during memory read/write cycles. Use Value: Bus-hold maintains last valid address state during bus release, avoiding spurious memory accesses during state transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer/level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC244ANS | No bus-hold; lower ICC (0.1 µA typical vs. 10 µA), slightly faster tpd (1.5 ns min vs. 1.5 ns min), same SO20 package. | Preferred where lowest static power is critical and external pull-ups are acceptable. | Select SN74LVC244ANS only if bus-hold is unnecessary and leakage-sensitive designs require sub-µA quiescent current. |
| 74LVCH244ADW | Same bus-hold and Schmitt features, but in SO20 wide-body (DW) package (7.5 mm width, 2.65 mm height); identical pinout and electrical specs. | Used when mechanical clearance or thermal dissipation requires wider SOIC footprint. | Choose 74LVCH244ADW for improved thermal performance in high-density layouts or when DW package is already standardized. |
Compared with SN74LVC244ANS and 74LVCH244ADW, the SN74LVCH244ANS uniquely combines bus-hold functionality with the narrow-body SO20 (NS) package, offering optimal PCB area efficiency for space-constrained industrial controllers without sacrificing input noise immunity or 5 V tolerance.
Availability
SN74LVCH244ANS is available at Aetrix Electronics and suitable for industrial automation, embedded control, and legacy system integration requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for SN74LVCH244ANS 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The SN74LVCH244ANS belongs to TI's 74LVC/LVCH logic family, engineered for low-voltage, mixed-signal interface applications where voltage translation, noise immunity, and reduced external component count are essential.
FAQ
What is the maximum input voltage rating for SN74LVCH244ANS?
The SN74LVCH244ANS supports input voltages up to 5.5 V, independent of VCC level - verified per Table 5 (Recommended Operating Conditions) and Table 4 (Limiting Values) in TI's SCAS739H datasheet. This allows direct connection to 5 V logic sources even when VCC is set to 1.8 V or 2.5 V, making SN74LVCH244ANS ideal for mixed-voltage system interfacing without external level shifters.
Does SN74LVCH244ANS include bus-hold circuitry on all inputs?
Yes, SN74LVCH244ANS includes integrated bus-hold on all eight data inputs (1A0–1A3 and 2A0–2A3), as explicitly stated in the "General description" and "Features and benefits" sections of the datasheet. This eliminates the need for external pull-up or pull-down resistors on unused or unterminated inputs, reducing component count and improving reliability in floating-bus scenarios.
What is the propagation delay of SN74LVCH244ANS at 3.3 V supply?
At VCC = 3.3 V and −40 °C to +125 °C, the SN74LVCH244ANS propagation delay (tpd) is specified as 1.5 ns (min) to 7.5 ns (max) for the nAn → nYn path, per Table 7 (Dynamic Characteristics) in the SCAS739H datasheet. Typical value is 2.9 ns, enabling reliable use in 100+ MHz clock-domain crossing applications with margin.
Can SN74LVCH244ANS operate with a 1.2 V supply?
Yes, SN74LVCH244ANS is fully specified down to 1.2 V VCC, as confirmed in Table 5 (Recommended Operating Conditions). At 1.2 V, it delivers functional operation with tpd ≤17.0 ns and supports input voltages up to 5.5 V - making SN74LVCH244ANS suitable for ultra-low-power battery-operated devices that retain compatibility with higher-voltage peripherals.
Is SN74LVCH244ANS pin-compatible with SN74LVC244ANS?
Yes, SN74LVCH244ANS and SN74LVC244ANS share identical SO20 (NS) pinout, terminal numbering, and functional block diagram. The only electrical difference is the presence of bus-hold circuitry in SN74LVCH244ANS - meaning SN74LVCH244ANS can be used as a drop-in replacement for SN74LVC244ANS in existing designs where enhanced input stability is desired.
SN74LVCH244ANS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVCH244ANS FAQ
1.How can I place an order for SN74LVCH244ANS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH244ANS 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 SN74LVCH244ANS reliable?
The price and inventory of SN74LVCH244ANS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH244ANS is usually 5 days.
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Once your SN74LVCH244ANS 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 SN74LVCH244ANS?
For technical support, including SN74LVCH244ANS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH244ANS requirements.
6.How does Aetrix verify that SN74LVCH244ANS is sourced from the original manufacturer or authorized distributors?
All SN74LVCH244ANS 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 SN74LVCH244ANS meets industry standards.
7.What is the process for return or replacement of SN74LVCH244ANS?
All SN74LVCH244ANS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH244ANS, 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 SN74LVCH244ANS part is unused and in its original packaging.
Return procedure for SN74LVCH244ANS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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