SN74S299DWR Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74S299DWR is an 8-bit bidirectional universal shift and storage register from Texas Instruments, operating at up to 50 MHz with parallel-in parallel-out interface. It supports hold mode and 45 pF load capacitance in a 20-pin SOIC package for TTL-compatible logic designs. Available in production stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- SN74S299DWR Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SN74S299DWR?
- 8-bit bidirectional shift/storage register with up to 50 MHz clock frequency for high-speed TTL logic applications
- Parallel-in parallel-out interface with hold mode enabling flexible data routing and bus interfacing
- 45 pF load capacitance rating in a 20-pin SOIC package for standard TTL S-family compatibility
What is SN74S299DWR used for?
SN74S299DWR is used in legacy TTL-compatible digital systems requiring bidirectional 8-bit data shifting and storage, such as address latches, data bus interfaces, and serial-to-parallel conversion circuits. Its 50 MHz maximum operating frequency supports clock-synchronous data routing in industrial controllers, test equipment, and communication hardware. The hold mode and universal shift capability enable it to serve as a versatile pipeline register in multi-board embedded systems.
What are the specifications of SN74S299DWR?
| Pbfree Code | No |
| YTEOL | 0 |
| Additional Feature | HOLD MODE |
| Count Direction | BIDIRECTIONAL |
| Family | S |
| JESD-30 Code | R-PDSO-G20 |
| Load Capacitance (CL) | 45pF |
| Logic IC Type | PARALLEL IN PARALLEL OUT |
| Max Frequency@Nom-Sup | 50000000Hz |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power Supply Current-Max (ICC) | 225mA |
| Propagation Delay (tpd) | 21ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| 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 |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 50MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the SN74S299DWR datasheet?
SN74S299DWR Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74S299DWR?
Compatible alternatives and drop-in replacements for SN74S299DWR:
Parallel In Parallel Out, S Series, 8-Bit, Bidirectional, True Output, TTL, PDSO20
Frequently Asked Questions
What is the maximum operating frequency of SN74S299DWR, and how does that affect high-speed bus designs?
SN74S299DWR operates at a maximum frequency of 50 MHz (50,000,000 Hz), making it compatible with fast TTL S-family logic bus architectures. At 50 MHz, the 8-bit bidirectional shift register can move data at up to 400 Mbit/s aggregate, suitable for legacy industrial data bus and address pipeline designs.
How does the bidirectional shift capability and hold mode of SN74S299DWR simplify address bus buffering?
SN74S299DWR supports both left and right bidirectional shifts plus a hold mode that freezes the 8-bit register contents without a clock edge, allowing the bus to be held stable during non-transfer cycles. The parallel-in parallel-out interface with 45 pF load capacitance makes it well-suited for address latching in microprocessor-based systems with TTL logic levels.
Which package does SN74S299DWR use, and is it suitable for through-hole or SMT assembly?
SN74S299DWR is packaged in a 20-pin SOIC (R-PDSO-G20) surface-mount package, making it compatible with automated SMT assembly lines. The wide-body 20-pin SOIC footprint provides adequate lead pitch for hand soldering during prototyping, though it is not Pb-free — designers targeting RoHS compliance should note its non-Pb-free (Pbfree Code: No) status.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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