SN74LS648DWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
SN74LS648DWG4 is an 8-bit bidirectional registered bus transceiver with independent direction control and a select input for multiplexed transmission of registered or real-time data, housed in a 24-pin SOIC package. It supports 45 pF load capacitance per channel and a maximum output sink current of 24 mA for driving heavily loaded data buses. Designed for microprocessor bus expansion, memory interface buffering, and multi-board data communication backplanes in industrial and computing systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 24
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS648DWG4 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 SN74LS648DWG4?
- 8-bit bidirectional registered bus transceiver with independent direction control
- Select input for multiplexed registered or real-time data transmission
- Supports 45 pF load capacitance per channel for long bus lines
- Maximum output sink current of 24 mA for driving loaded buses
- LS logic family with TTL-compatible voltage levels
- 24-pin SOIC package for board-level bus interface integration
What is SN74LS648DWG4 used for?
The SN74LS648DWG4 is used in microprocessor address and data bus expansion systems where bidirectional 8-bit buffering with latching is required between memory, I/O, and CPU interfaces. Its multiplexed registered/real-time select input accommodates complex backplane designs with both latched and transparent data paths on a single 8-bit width. It is also found in industrial control PLCs, embedded computing boards, and legacy TTL-based communication systems requiring reliable 8-bit bus transceiver functionality.
What are the specifications of SN74LS648DWG4?
| YTEOL | 0 |
| Additional Feature | DIRECTION CONTROL; SELECT INPUT FOR MULTIPLEXED TRANSMISSION OF REGISTERED OR REAL TIME DATA |
| Control Type | INDEPENDENT CONTROL |
| Count Direction | BIDIRECTIONAL |
| Family | LS |
| JESD-30 Code | R-PDSO-G24 |
| Load Capacitance (CL) | 45pF |
| Logic IC Type | REGISTERED BUS TRANSCEIVER |
| Max I(ol) | 0.024A |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | INVERTED |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP24,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power Supply Current-Max (ICC) | 165mA |
| Prop. Delay@Nom-Sup | 40ns |
| Propagation Delay (tpd) | 40ns |
| 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 |
| 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 SN74LS648DWG4 datasheet?
SN74LS648DWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SN74LS648DWG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What makes the registered mode of SN74LS648DWG4 useful for bus timing in microprocessor systems?
The registered mode latches all 8 data bits on a clock edge, decoupling bus write timing from downstream memory or peripheral setup requirements, allowing the processor to release the bus immediately while the registered data holds valid for up to 45 pF load capacitance on each output.
How does the 24 mA sink current capability of SN74LS648DWG4 help drive long PCB traces?
At 24 mA maximum output sink current, the device can drive TTL logic levels into resistive-terminated bus lines and long PCB traces with multiple loads without excessive voltage droop, maintaining valid logic-low levels across an 8-bit bidirectional data bus.
Can SN74LS648DWG4 replace a non-registered bus transceiver when only real-time data transmission is needed?
Yes. By selecting the real-time (transparent) mode via the select input, SN74LS648DWG4 functions as a standard 8-bit bidirectional bus buffer without latching, allowing it to substitute for non-registered transceivers while retaining the option to switch to registered mode for 45 pF loaded bus lines.
Which logic family does SN74LS648DWG4 belong to, and what supply voltage does it require?
It belongs to the LS (Low-power Schottky) TTL family, operating from a standard 5 V supply with TTL-compatible input thresholds, making it directly compatible with legacy 5 V bus architectures in industrial control, computing backplanes, and embedded systems using 8-bit data paths.
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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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