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Texas Instruments SN74AS298ADRG4
- Part No.:
- SN74AS298ADRG4
- Manufacturer:
- Texas Instruments
- Category:
- Signal Switches, Multiplexers, Decoders
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AS298ADRG4.pdf
- Description:
- IC MULTIPLEXER 4 X 2:1 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,713
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Product details
Overview
SN74AS298ADRG4 from Texas Instruments is a quadruple 2-input multiplexer with synchronous storage, functioning as a dual 4-bit register/multiplexer in a single 16-pin SOIC package. It selects between two 4-bit data words (A1–D1 or A2–D2) via the WS input and latches the chosen word on the negative edge of CLK, delivering outputs QA–QD. It operates at up to 62 MHz across 0°C to 70°C and supports arithmetic processor operand routing and parallel register exchange.
For engineers reviewing the SN74AS298ADRG4 datasheet, SN74AS298ADRG4 pinout, SN74AS298ADRG4 application, or SN74AS298ADRG4 equivalent, key selection criteria include its dual-word synchronous latch behavior, 62 MHz clock frequency, 4.5 V–5.5 V supply range, negative-edge clocking, and compatibility with TTL-level logic interfaces in legacy computing and control systems.
Technical Context
The SN74AS298ADRG4 integrates multiplexing and storage in one device: two independent 4-bit data paths feed into a common set of D-type flip-flops, with word-select (WS) determining which path loads on CLK↓. Its architecture eliminates need for discrete multiplexer + register combinations like SN74AS157 + SN74AS175A.
It supports compound shift operations-e.g., 1-place or 2-place BCD/binary shifts per clock cycle-by toggling WS between clock edges. Timing is characterized with tPLH/tPHL ≤ 11 ns (CL = 50 pF), setup/hold times as low as 1 ns (WS hold), and guaranteed operation at 62 MHz maximum clock frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Function | Quadruple 2-input multiplexer with synchronous D-type latch storage |
| Max Clock Frequency | 62 MHz - enables high-speed operand switching in arithmetic processors |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL systems with margin for rail variation |
| Propagation Delay (CLK→Q) | 1–11 ns - ensures tight timing control in pipelined register transfers |
| Output Drive | IOL = 20 mA / IOH = −2 mA - sufficient to drive multiple TTL inputs without buffering |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded and industrial control environments |
| Input Logic Levels | VIL ≤ 0.8 V, VIH ≥ 2.0 V - fully compatible with standard TTL voltage thresholds |
Pinout & Package
SN74AS298ADRG4 is packaged in a 16-pin SOIC (D package), 3.9 mm width, with standard pin spacing and RoHS-compliant NiPdAu lead finish. Moisture sensitivity level is Level-1 (unlimited floor life at ≤30°C/60% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | B2 | Bit-2 input of second 4-bit word (active when WS = H) |
| 2 | A2 | Bit-1 input of second 4-bit word (active when WS = H) |
| 3 | A1 | Bit-1 input of first 4-bit word (active when WS = L) |
| 4 | B1 | Bit-2 input of first 4-bit word (active when WS = L) |
| 5 | C2 | Bit-3 input of second 4-bit word (active when WS = H) |
| 6 | D2 | Bit-4 input of second 4-bit word (active when WS = H) |
| 7 | D1 | Bit-4 input of first 4-bit word (active when WS = L) |
| 8 | GND | Ground reference for all logic and output stages |
| 9 | VCC | +5 V power supply (4.5–5.5 V nominal) |
| 10 | QA | Registered output of bit-1 (latched value of selected A1/A2) |
| 11 | QB | Registered output of bit-2 (latched value of selected B1/B2) |
| 12 | QC | Registered output of bit-3 (latched value of selected C1/C2) |
| 13 | QD | Registered output of bit-4 (latched value of selected D1/D2) |
| 14 | CLK | Clock input - triggers synchronous load on negative edge |
| 15 | WS | Word-select control - L selects word-1 (A1–D1), H selects word-2 (A2–D2) |
| 16 | C1 | Bit-3 input of first 4-bit word (active when WS = L) |
Key Features
| Feature | Design Value |
|---|---|
| Dual 4-bit word selection with synchronous latch | Enables time-aligned operand switching in ALU pipelines without external registers |
| Negative-edge clock triggering | Allows precise synchronization with system clocks aligned to falling transitions |
| Compound shift capability (1- or 2-place) | Supports BCD digit rotation and binary multiplier/divider micro-architectures in one device |
| TTL-compatible input/output levels | Direct interface with legacy 74AS/74ALS logic families without level-shifting |
| High-speed operation (62 MHz max) | Meets timing requirements of fast arithmetic processors and real-time control sequencers |
Applications
| Arithmetic Processor Operand Routing | Parallel Register Exchange |
|---|---|
|
Use Scenario: Arithmetic logic unit (ALU) requires alternating access to two sets of operands (e.g., accumulator vs. memory buffer) within a single instruction cycle. IC Role / Device Role / Timing Role: SN74AS298ADRG4 acts as a synchronized dual-source selector, loading either operand set into QA–QD on CLK↓ based on WS state. Use Value: Frees register file space by offloading operand staging, enabling concurrent data acquisition while ALU computes. |
Use Scenario: Two 4-bit registers must swap contents atomically (e.g., in a bidirectional data bus controller or pipeline stage). IC Role / Device Role / Timing Role: SN74AS298ADRG4 implements cross-coupled feedback: outputs QA–QD drive A2–D2 and A1–D1 simultaneously while WS toggles per clock. Use Value: Achieves full 4-bit register exchange in one clock cycle without external gating or sequencing logic. |
| BCD Digit Shift Register | Multiplier Micro-Architecture Support |
|
Use Scenario: Decimal arithmetic unit shifts entire 4-bit BCD digits left/right for alignment prior to addition or multiplication. IC Role / Device Role / Timing Role: SN74AS298ADRG4 functions as a universal shift register: WS controls whether shift is 1-place (WS=L) or 2-place (WS=H) per CLK↓. Use Value: Reduces gate count versus discrete shift-register implementations; retains parallel-load capability for digit initialization. |
Use Scenario: Hardware multiplier uses iterative partial-product accumulation with shifting of multiplicand and multiplier. IC Role / Device Role / Timing Role: SN74AS298ADRG4 provides configurable shift register stages that support both single-bit and double-bit shifts under ALU control signals. Use Value: Enables compact, cycle-optimized multiplier designs where shift distance varies dynamically per iteration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplexer-with-storage applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AS157 + SN74AS175A | Two separate ICs: quad 2-input mux + quad D-flip-flop; requires additional board area and interconnect | Same functional capability but lacks integrated timing coordination; higher propagation skew between mux and latch | Choose if board layout already accommodates dual-IC placement and timing budget allows added delay |
| SN74LS298N | Lower-speed TTL version (max 30 MHz); higher VOL (0.5 V), lower IOL (8 mA); same pinout and logic function | Suitable only for legacy 74LS-based systems with relaxed speed and drive requirements | Choose only for drop-in replacement in existing LS designs where 62 MHz performance is unnecessary |
Compared with SN74AS298ADRG4, SN74AS157+SN74AS175A increases component count and timing uncertainty, while SN74LS298N sacrifices speed and drive strength for compatibility with older 74LS logic families-neither offers the integrated high-speed, high-drive advantage of the AS-family device.
Availability
SN74AS298ADRG4 is available at Aetrix Electronics and suitable for arithmetic processor design, legacy system repair, BCD-based instrumentation, and industrial control sequencers requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74AS298ADRG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS298ADRG4 belongs to TI's advanced Schottky (AS) logic family, engineered for high-speed, low-noise digital control in commercial-grade computing and instrumentation systems where timing precision and TTL compatibility are critical.
FAQ
What is the primary function of the SN74AS298ADRG4?
The SN74AS298ADRG4 is a quadruple 2-input multiplexer with synchronous D-type latch storage. It selects between two 4-bit data words (A1–D1 or A2–D2) using the WS input and loads the chosen word into QA–QD on the negative edge of CLK. This enables time-aligned operand routing and register exchange in arithmetic processors and control logic without external latches.
Does the SN74AS298ADRG4 support 3.3 V operation?
No, the SN74AS298ADRG4 is specified only for 4.5 V to 5.5 V operation and is not 3.3 V tolerant. Its input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and output drive characteristics are optimized for 5 V TTL systems. Using it with 3.3 V logic may result in unreliable switching or excessive current draw due to VIH/VIL mismatch.
What is the significance of the negative-edge clock triggering in the SN74AS298ADRG4?
The SN74AS298ADRG4 latches data on the negative-going edge of CLK, enabling precise synchronization with falling-edge–triggered system clocks. This allows clean separation between data setup (before CLK↓) and hold (after CLK↓), supporting high-speed operation up to 62 MHz with minimal timing uncertainty-critical in pipelined ALU and register-file control applications.
Can the SN74AS298ADRG4 be used as a shift register?
Yes, the SN74AS298ADRG4 can implement configurable shift registers. By cross-connecting QA–QD to A2–D2 and A1–D1 and toggling WS per clock cycle, it performs 1-place or 2-place shifts of 4-bit data (e.g., BCD digits). The datasheet confirms this use in arithmetic units and multiplier micro-architectures with no added logic.
Is the SN74AS298ADRG4 pin-compatible with the SN74LS298N?
Yes, the SN74AS298ADRG4 shares identical pinout and logic function with the SN74LS298N, including terminal assignments for A1–D2, QA–QD, CLK, WS, VCC, and GND. However, it is not a direct drop-in replacement due to differences in speed (62 MHz vs. 30 MHz), output drive (20 mA vs. 8 mA), and supply voltage tolerance-system timing and loading must be re-validated.
SN74AS298ADRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Multiplexer
- Circuit:
- 4 x 2:1
- Independent Circuits:
- 1
- Current - Output High, Low:
- 2mA, 20mA
- Voltage Supply Source:
- Single Supply
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74AS298ADRG4 FAQ
1.How can I place an order for SN74AS298ADRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS298ADRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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The price and inventory of SN74AS298ADRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS298ADRG4 is usually 5 days.
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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 SN74AS298ADRG4?
For technical support, including SN74AS298ADRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS298ADRG4 requirements.
6.How does Aetrix verify that SN74AS298ADRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS298ADRG4 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 SN74AS298ADRG4 meets industry standards.
7.What is the process for return or replacement of SN74AS298ADRG4?
All SN74AS298ADRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS298ADRG4, 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 SN74AS298ADRG4 part is unused and in its original packaging.
Return procedure for SN74AS298ADRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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