SN74ALS857DWRG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74ALS857DWRG4 is a hex 2-to-1 line universal multiplexer from the ALS family with 3-state outputs and 24 mA sink current. Integrates 6 independent multiplexer channels for high-speed bus switching at 50 pF load capacitance. Packaged in 24-pin SOP with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- SN74ALS857DWRG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Hex 2-to-1 architecture provides 6 independent multiplexer channels in a single 24-pin package, reducing chip count in bus-switching designs
- 3-state outputs with 24 mA sink current enable direct connection to shared data buses without external buffers
- Advanced Low-Power Schottky (ALS) logic technology delivers fast propagation delays with reduced power consumption versus standard TTL
- 50 pF rated load capacitance supports driving standard backplane and PCB trace capacitances at full switching speed
Applications
SN74ALS857DWRG4 is used in microprocessor bus multiplexing, data routing, and address selection circuits where 6 channels of 2-to-1 selection are needed in a compact package. Its 3-state outputs allow multiple devices to share a common 8-bit data bus without bus contention in memory expansion and peripheral interface designs. The ALS family speed and drive strength also make it suitable for industrial programmable logic controller backplanes and legacy TTL-compatible communication interfaces.
Specifications
| YTEOL | 0 |
| Family | ALS |
| JESD-30 Code | R-PDSO-G24 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | MULTIPLEXER |
| Max I(ol) | 0.024A |
| Number of Functions | 6 |
| Number of Inputs | 2 |
| Number of Outputs | 1 |
| Output Characteristics | 3-STATE |
| Output Polarity | CONFIGURABLE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP24,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power Supply Current-Max (ICC) | 36mA |
| Prop. Delay@Nom-Sup | 25ns |
| Propagation Delay (tpd) | 33ns |
| 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 Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many independent multiplexer channels does SN74ALS857DWRG4 provide per package?
SN74ALS857DWRG4 contains 6 independent 2-to-1 multiplexer channels in a single 24-pin SOP package, each with its own select and output enable control. This allows simultaneous routing of 6 separate signals from two buses to one output bus, replacing 6 discrete 2-to-1 mux ICs in high-density designs and reducing board area significantly.
What is the output drive capability of SN74ALS857DWRG4 and how does it handle bus loading?
SN74ALS857DWRG4 provides 3-state outputs capable of sinking up to 24 mA and is characterized at a 50 pF load capacitance per output. The 3-state feature allows outputs to go high-impedance when the device is deselected, making it safe to connect multiple SN74ALS857DWRG4 devices in parallel on a shared TTL-level data bus without bus contention.
In what legacy TTL bus architectures is SN74ALS857DWRG4 a drop-in multiplexer solution?
SN74ALS857DWRG4 from the ALS (Advanced Low-Power Schottky) family is pin-compatible with earlier 74S857 and 74LS857 devices, making it a direct replacement in 8088/8086-era microcomputer bus expansion boards, EPROM address multiplexers, and ISA bus adapters. Its improved speed-to-power ratio over 74LS devices reduces supply current while maintaining TTL-compatible input thresholds of 2 V high and 0.8 V low.
How does SN74ALS857DWRG4 compare to HC-family multiplexers for a 5 V industrial PLC backplane design?
SN74ALS857DWRG4 delivers higher output sink current of 24 mA versus the typical 4 mA of 74HC multiplexers, making it better suited for driving the heavier bus loads on industrial PLC backplanes with multiple card slots. The ALS family also guarantees TTL-level input thresholds, ensuring reliable interfacing with legacy 5 V logic without the potential metastability issues that can arise from mixing CMOS and TTL logic levels at speed.
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