SN74ALS244CDBRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74ALS244CDBRG4 is an octal unidirectional buffer and line driver in the Advanced Low-power Schottky TTL family, featuring active-low output-enable control, 24 mA sink current capability, and 50 pF load capacitance rating in a 20-pin SOIC package. It is designed for driving high-capacitance bus lines, address buffers, and memory interface signals in industrial and computing systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74ALS244CDBRG4 Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.6708(MOQ 6000)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Octal 8-channel unidirectional buffer with active-low output-enable control
- 24 mA output sink current for driving 50 pF bus loads at standard TTL logic levels
- ALS family low-power Schottky design reducing power consumption vs standard LS devices
- 20-pin SOIC package enabling compact bus driver placement in address and data path layouts
- Non-inverting 3-state outputs for bus sharing and high-impedance isolation
- Compatible with 74S, 74LS, and 74ALS logic families for broad system integration
Applications
SN74ALS244CDBRG4 is used in address bus buffering for SRAM and DRAM memory interfaces in industrial control boards and legacy computing systems requiring ALS-family TTL compatibility and 24 mA drive strength. It serves as a unidirectional data bus isolator in backplane architectures where multiple card slots share a common 8-bit bus and individual card enables must isolate inactive segments. The device is also employed in FPGA and DSP output buffer stages where 3-state bus control and high-capacitance load drive up to 50 pF are needed to ensure signal integrity across PCB traces.
Specifications
| Date Of Intro | 1986-01-01 |
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | ALS |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.024A |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SSOP20,.3 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, SHRINK PITCH |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 24mA |
| Prop. Delay@Nom-Sup | 10ns |
| Propagation Delay (tpd) | 10ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74ALS244CDBRG4:
Frequently Asked Questions
How much current can SN74ALS244CDBRG4 sink on each output, and how many standard TTL loads does this support?
SN74ALS244CDBRG4 sinks 24 mA per output at a guaranteed VOL of 0.5 V, which is sufficient to drive 12 standard TTL loads each requiring 2 mA, or 8 ALS loads at 3 mA each. This drive strength is also sufficient to charge and discharge 50 pF bus capacitance at TTL switching speeds, making it appropriate for address and data buses with moderate line lengths of up to 15 cm on a 4-layer PCB.
How does the ALS family power consumption of SN74ALS244CDBRG4 compare to standard 74LS244 in a bus driver application?
The ALS (Advanced Low-power Schottky) family of SN74ALS244CDBRG4 reduces quiescent supply current by approximately 30% to 50% compared to standard 74LS244, with typical ICC around 16 mA versus 24 mA for 74LS244 at 5 V. In a system with 10 bus drivers continuously enabled, this translates to roughly 400 mW versus 600 mW total driver power, a meaningful reduction in backplane power budgets with hundreds of logic devices.
Can the 3-state outputs of SN74ALS244CDBRG4 be used to safely share a single 8-bit data bus among multiple driving sources?
Yes, SN74ALS244CDBRG4 supports 3-state operation controlled by two active-low output-enable inputs (OE1 and OE2), each controlling 4 channels. When both enable inputs are high, all 8 outputs enter high-impedance state, allowing another driver or a microcontroller port to take control of the shared bus. Only one driver should assert its outputs at any time to avoid bus contention; the high-impedance state current leakage is specified at less than 50 µA, preventing significant bus loading when the device is disabled.
Is SN74ALS244CDBRG4 suitable as a drop-in replacement for 74LS244 in a legacy industrial controller board?
SN74ALS244CDBRG4 is pin-compatible with 74LS244 in the 20-pin DIP or SOIC footprint and is electrically compatible with standard TTL input and output voltage thresholds. The ALS variant has lower propagation delay (typically 5 ns versus 9 ns for 74LS244), so timing margins improve rather than degrade. Supply current decreases, reducing thermal load on the power supply. No schematic changes are required; only a PCB footprint verification for the SOIC package versus DIP is needed if the legacy board used through-hole 74LS244.
What is the propagation delay of SN74ALS244CDBRG4 and how does it affect address setup time in a SRAM memory interface?
SN74ALS244CDBRG4 has a typical propagation delay of 5 ns and a maximum of 8 ns at 5 V supply, measured with a 50 pF load. In a SRAM address bus application where the memory requires a 10 ns address setup time before chip-select assertion, the 8 ns maximum buffer delay leaves only 2 ns margin from the upstream driver output. Designers must verify that the address source (CPU or FPGA output) asserts address lines at least 18 ns before chip-select to meet timing across all process corners.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 6000+ | $0.6859 | $4115.22 |
| 10000+ | $0.6764 | $6763.70 |
| 14000+ | $0.6708 | $9391.48 |
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