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Texas Instruments SN74HCS244DGSR
- Part No.:
- SN74HCS244DGSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.118", 3.00mm Width)
- Datasheet:
-
SN74HCS244DGSR.pdf
- Description:
- OCTAL BUFFERS AND LINE DRIVERS W
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74HCS244 from Texas Instruments is an octal non-inverting buffer/line driver with Schmitt-trigger inputs and 3-state outputs, configured as two independent 4-channel banks (1A1–1Y4 and 2A1–2Y4), operating from 2 V to 6 V supply, delivering ±7.8 mA output drive at 6 V, and rated for –40°C to +125°C ambient temperature - used in industrial I/O conditioning and noisy microcontroller interface applications.
For engineers reviewing the SN74HCS244 datasheet, SN74HCS244 pinout, SN74HCS244 application, or SN74HCS244 equivalent, key selection considerations include Schmitt-trigger noise immunity, dual-bank 3-state control, low ICC (100 nA typical), input hysteresis (0.6 V min at 6 V), and VQFN-20 (RKS) / SOT-20 (DGS) package compatibility.
Technical Context
The SN74HCS244 implements dual independent 4-bit buffer banks, each controlled by a dedicated active-low output enable (1OE, 2OE). Each channel performs xYn = xAn logic with no inversion. Schmitt-trigger inputs provide hysteresis (ΔVT ≥ 0.6 V at 6 V), enabling reliable operation with slow-rising or noisy signals without external filtering.
Outputs are balanced CMOS 3-state drivers capable of sourcing/sinking up to ±7.8 mA at 6 V while maintaining VOH ≥ 5.4 V and VOL ≤ 0.33 V. The device supports rail-to-rail input (0–VCC) and output (0–VCC) operation across its full 2–6 V supply range, with input leakage limited to ±100 nA at 6 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interfacing with 3.3 V and 5 V systems without level shifters. |
| Output Drive Strength | ±7.8 mA at 6 V - sufficient to drive moderate capacitive loads (≤50 pF) and multiple CMOS inputs. |
| Input Hysteresis (ΔVT) | 0.6 V (min) at 6 V - rejects noise spikes up to ±300 mV peak-to-peak on input lines. |
| Quiescent Supply Current (ICC) | 100 nA typical at 6 V - supports ultra-low-power standby modes in battery-backed systems. |
| Ambient Temperature Range | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and harsh-environment PLC I/O. |
| Propagation Delay (tpd) | 6 ns (max) at 6 V - ensures timing-critical signal buffering with sub-10 ns latency per channel. |
| ESD Rating (HBM) | ±4000 V - provides robust handling during board assembly and field service without additional protection. |
Pinout & Package
SN74HCS244 is available in two surface-mount packages: RKS (20-pin VQFN, 4.50 mm × 2.50 mm) and DGS (20-pin SOT, 5.10 mm × 3.00 mm). Both packages feature wettable flanks (RKS only) for automated optical inspection (AOI) of solder joints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low bank enable inputs | Independent control of Bank 1 (pins 1A1–1Y4) and Bank 2 (pins 2A1–2Y4); tie high via pull-up for power-up high-Z safety. |
| 1A1–1A4, 2A1–2A4 | Buffer input terminals | Eight Schmitt-trigger inputs accepting slow/noisy signals; unused pins must be tied to VCC or GND. |
| 1Y1–1Y4, 2Y1–2Y4 | 3-state buffered outputs | Eight CMOS push-pull outputs; high-impedance when respective OE is high; capable of driving bidirectional buses. |
| VCC, GND | Power supply terminals | Single-supply operation; thermal pad (RKS only) may be connected to GND for improved thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs with programmable hysteresis | Enables reliable digitization of slow-rising analog-like signals (e.g., mechanical switch bounce, sensor outputs) without external RC filtering. |
| Dual independent 4-bit banks with separate OE control | Allows selective isolation of two subsystems (e.g., sensor interface vs. actuator control) using minimal GPIO resources. |
| Balanced CMOS 3-state outputs | Supports bidirectional bus sharing (e.g., shared data lines between MCU and peripherals) with fast turn-on/turn-off times (6–19 ns). |
| Ultra-low static current (100 nA typical) | Reduces system-level quiescent power in always-on monitoring circuits - critical for energy-harvesting and battery-powered nodes. |
| Rail-to-rail input/output compatibility | Accepts and drives full 0–VCC logic levels across 2–6 V supply, eliminating need for external voltage translators in mixed-supply designs. |
Applications
| Industrial Sensor Interface | Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Conditioning slow-rising thermistor or potentiometer wiper signals before ADC sampling in a PLC module. IC Role / Device Role / Timing Role: Buffer and noise-immune digitization of analog-derived digital signals; operates as level-shifting signal conditioner with hysteresis-based edge detection. Use Value: Eliminates external RC filters and Schmitt-trigger ICs, reducing BOM count and PCB area while improving ESD robustness (±4 kV HBM). |
Use Scenario: Extending GPIO count of a resource-constrained MCU to drive multiple LED indicators and relay drivers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer enabling time-multiplexed control of shared output lines; dual OE pins allow bank-selective activation. Use Value: Enables single MCU pin to control four LEDs or relays per bank, reducing firmware complexity and pin allocation pressure. |
| Automotive Body Control Module | Industrial Pushbutton Debouncing |
|
Use Scenario: Interfacing mechanical door-lock switches in a 12 V automotive system with a 3.3 V microcontroller. IC Role / Device Role / Timing Role: Level-translating, noise-immune signal conditioner with integrated hysteresis; operates directly from 3.3 V or 5 V rail. Use Value: Withstands load-dump transients and conducted noise without latch-up; eliminates need for discrete clamping diodes and pull-ups. |
Use Scenario: Removing contact bounce from panel-mounted momentary switches in factory HMIs. IC Role / Device Role / Timing Role: Hardware debouncer using Schmitt-trigger input thresholds and stable CMOS output; no software polling or timer overhead required. Use Value: Guarantees clean, single-edge transitions to MCU interrupt inputs - reduces firmware debounce code size and CPU load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer with Schmitt-trigger input applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCS125DR | Quad buffer (4 channels), same Schmitt inputs and 3-state outputs; lower pin count and drive (±7.8 mA at 6 V unchanged). | Suitable where only four buffered lines are needed; requires two devices for full octal functionality. | Select when board space or channel count permits modular expansion instead of monolithic octal solution. |
| 74LVC244APW,118 | No Schmitt-trigger inputs; standard CMOS inputs require clean, fast-rising signals; identical 20-pin TSSOP package. | Requires external RC filtering or firmware debouncing for noisy inputs; not suitable for slow-switch applications. | Choose only in noise-free digital environments (e.g., backplane interconnects) where cost is prioritized over robustness. |
Compared with SN74HCS125DR and 74LVC244APW,118, the SN74HCS244 uniquely delivers full octal buffering with integrated Schmitt-trigger noise immunity in a single 20-pin package - essential for industrial switch interfaces and sensor signal conditioning where signal integrity cannot be guaranteed.
Availability
SN74HCS244 is available at Aetrix Electronics and suitable for industrial sensor conditioning, automotive body control modules, and microcontroller I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HCS244 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 experience in high-reliability industrial and automotive-grade components.
The SN74HCS244 belongs to TI's HCS logic family - designed specifically for robust, low-power, noise-immune digital interfacing in harsh environments where signal integrity and long-term supply stability are critical.
FAQ
What is the maximum recommended capacitive load for SN74HCS244?
The SN74HCS244 is specified to meet all timing and voltage specifications with a total load capacitance ≤50 pF. Driving larger capacitive loads (e.g., >100 pF) will increase propagation delay and transition time beyond datasheet limits and may cause signal integrity issues such as ringing or undershoot. For heavier loads, consider adding series damping resistors or using a higher-drive buffer. The SN74HCS244 itself does not include internal slew-rate control.
Does SN74HCS244 support 1.8 V operation?
No, SN74HCS244 is not rated for 1.8 V operation. Its absolute minimum supply voltage is 2 V, and recommended operating conditions specify 2 V to 6 V. At 1.8 V, the device may fail to meet logic threshold guarantees (VT+ and VT−), output drive strength, or timing specifications. For 1.8 V systems, consider TI's SN74LVC1G17 or similar 1.65–5.5 V Schmitt-trigger buffers.
How should unused inputs on SN74HCS244 be terminated?
All unused inputs on SN74HCS244 must be terminated to a valid logic level - either VCC or GND - using a direct connection or a pull-up/pull-down resistor. A 10-kΩ resistor is recommended if dynamic switching is expected; direct ties are acceptable for permanently static inputs. Leaving inputs floating violates Absolute Maximum Ratings and risks increased ICC, oscillation, or ESD susceptibility. This applies regardless of Schmitt-trigger architecture.
Can SN74HCS244 outputs be safely wired in parallel?
No, SN74HCS244 outputs must never be directly paralleled - even when both are enabled - because mismatched propagation delays or output impedance can cause shoot-through current, excessive power dissipation, and potential device damage. To share a common bus, use only one enabled output at a time via coordinated OE control, or implement external OR-ing diodes or bus transceivers designed for wired-OR operation.
What is the purpose of the thermal pad in the RKS (VQFN) package of SN74HCS244?
The exposed thermal pad in the RKS package improves heat dissipation from the die to the PCB. It may be connected to GND (recommended for electrical and thermal performance) or left floating - but must never be connected to VCC or any signal net. Proper solder paste stencil design and reflow profile are required to ensure void-free solder joint formation beneath the pad, which directly impacts junction temperature rise under sustained output loading.
SN74HCS244DGSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCS
- Package/Case:
- 20-TFSOP (0.118", 3.00mm 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:
- Schmitt Trigger
- Output Type:
- 3-State
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VSSOP
SN74HCS244DGSR FAQ
1.How can I place an order for SN74HCS244DGSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCS244DGSR 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 SN74HCS244DGSR reliable?
The price and inventory of SN74HCS244DGSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCS244DGSR is usually 5 days.
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SN74HCS244DGSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCS244DGSR 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 SN74HCS244DGSR?
For technical support, including SN74HCS244DGSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCS244DGSR requirements.
6.How does Aetrix verify that SN74HCS244DGSR is sourced from the original manufacturer or authorized distributors?
All SN74HCS244DGSR 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 SN74HCS244DGSR meets industry standards.
7.What is the process for return or replacement of SN74HCS244DGSR?
All SN74HCS244DGSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCS244DGSR, 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 SN74HCS244DGSR part is unused and in its original packaging.
Return procedure for SN74HCS244DGSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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