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Texas Instruments SN74ALS112ADR
- Part No.:
- SN74ALS112ADR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALS112ADR.pdf
- Description:
- IC FF JK TYPE DUAL 1BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,803
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Product details
Overview
SN74ALS112ADR from Texas Instruments is a dual J-K negative-edge-triggered flip-flop IC operating at 5 V, delivering 30 MHz maximum clock frequency, 6 mW typical power dissipation per flip-flop, and guaranteed operation from 0°C to 70°C. It performs synchronous data storage and toggle functions in digital control logic, commonly used in state machines, counters, and register files.
For engineers reviewing the SN74ALS112ADR datasheet, SN74ALS112ADR pinout, SN74ALS112ADR application, or SN74ALS112ADR equivalent, this page provides verified functional behavior, timing margins, package-specific layout constraints, and direct alternatives for legacy TTL-compatible logic design.
Technical Context
This device implements two independent J-K flip-flops with asynchronous preset (PRE) and clear (CLR) inputs active-low, enabling immediate output override regardless of clock or data states. Each flip-flop responds only on the negative-going edge of CLK, with setup time (22 ns) and hold time (0 ns) defined relative to that transition.
It uses ALS (Advanced Low-Power Schottky) bipolar technology, providing TTL-compatible input thresholds (VIL = 0.8 V max, VIH = 2 V min), totem-pole outputs (IOL = 8 mA, IOH = −0.4 mA), and fully buffered inputs for noise immunity. No internal 3-state or open-collector functionality is present.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ALS (Advanced Low-Power Schottky) - ensures TTL compatibility with reduced power vs standard LS. |
| Max Clock Frequency | 30 MHz - supports high-speed synchronous logic up to 33.3 ns period in commercial temperature range. |
| Supply Voltage Range | 4.5 V to 5.5 V - requires regulated 5 V rail; not tolerant of undervoltage or overvoltage beyond absolute max 7 V. |
| Propagation Delay (tPLH/tPHL) | 3–15 ns (CLK to Q) - enables precise timing budgeting in critical path analysis for combinatorial-sequential interfaces. |
| Output Drive Capability | IOL = 8 mA / IOH = −0.4 mA - sufficient to drive 10 standard TTL loads or one LS-TTL input without buffering. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade industrial and computing applications, not extended or military range. |
| Power Dissipation | 6 mW per flip-flop (typical) - enables dense logic integration without thermal derating concerns in ambient conditions. |
Pinout & Package
SN74ALS112ADR is supplied in a 16-pin SOIC (D) package, 7.5 mm wide, with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level 1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 10, 11, 12, 13, 14, 15 | Functional I/O (J/K/CLK/CLR/PRE/Q/Q̅) | Two complete J-K flip-flop channels with independent controls and complementary outputs; no shared resources. |
| 7 | GND | Ground reference for all inputs, outputs, and internal biasing; must be low-impedance connection to minimize noise coupling. |
| 16 | VCC | +5 V supply pin; decoupling capacitor (0.1 µF ceramic) required within 10 mm for stable switching performance. |
| 8, 9 | Q and Q̅ (Channel 1) | True and complement outputs of first flip-flop; both driven simultaneously with matched rise/fall times. |
| 14, 15 | Q and Q̅ (Channel 2) | True and complement outputs of second flip-flop; electrically isolated from Channel 1 except via shared VCC/GND. |
Key Features
| Feature | Design Value |
|---|---|
| Negative-edge clock triggering | Ensures deterministic sampling aligned to falling clock edge, eliminating metastability risk from asynchronous rising-edge setups. |
| Asynchronous PRE/CLR | Allows immediate reset/set independent of clock phase-critical for power-on initialization and fault recovery sequences. |
| Toggle mode support (J=K=HIGH) | Enables divide-by-2 counter functionality without external feedback logic, reducing gate count in clock division circuits. |
| Full input buffering | Isolates internal circuitry from PCB trace noise and crosstalk, maintaining reliable operation in mixed-signal environments. |
| TTL-compatible voltage thresholds | Guarantees interoperability with legacy 74LS, 74F, and microcontroller GPIOs without level-shifting components. |
Applications
| Industrial Control Sequencing | Digital Test Equipment Counters |
|---|---|
Use Scenario: A programmable logic controller (PLC) executes step-based machine motion using discrete sensor inputs and relay outputs. IC Role / Device Role / Timing Role: SN74ALS112ADR stores step state bits and toggles between operational phases on each scan cycle clock edge. Use Value: Asynchronous PRE/CLR enables immediate emergency stop state reset; 30 MHz rating supports fast scan rates up to 10 kHz. |
Use Scenario: A benchtop frequency counter captures incoming signal periods using synchronized gating and decade counting. IC Role / Device Role / Timing Role: SN74ALS112ADR forms the first stage of a synchronous binary counter chain, dividing input clock by two before feeding downstream stages. Use Value: Matched tPLH/tPHL (≤15 ns) ensures minimal skew across bit transitions, preserving counter accuracy at 25 MHz input. |
| Legacy Computer Bus Interface | Communications Protocol State Machine |
Use Scenario: An ISA-bus peripheral card latches address/data strobes and generates handshake signals for CPU read/write cycles. IC Role / Device Role / Timing Role: SN74ALS112ADR holds bus enable status and synchronizes control flags to system clock domain. Use Value: 6 mW per flip-flop allows integration of 8+ units on same board without thermal hotspots; TTL compatibility avoids interface level shifters. |
Use Scenario: A UART-compatible serial interface implements start-bit detection and frame synchronization using finite-state logic. IC Role / Device Role / Timing Role: SN74ALS112ADR stores current bit position and advances on each received clock edge during frame reception. Use Value: Setup time (22 ns) and hold time (0 ns) align precisely with standard 16× oversampling receiver timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual J-K flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS112N | Lower max clock (25 MHz), higher power (7 mW), identical pinout and function. | Valid drop-in replacement where speed margin is acceptable; not suitable for 30 MHz designs. | Select SN74LS112N only if existing board layout and timing budget accommodate 20% lower fmax. |
| SN74HC112DR | CMOS family, 2–6 V supply, 28 MHz max, near-zero static power, but non-TTL input thresholds (VIH = 3.15 V min). | Requires level translation when interfacing with 5 V TTL sources; unsuitable for direct substitution without redesign. | Choose SN74HC112DR only in new designs targeting low-power operation and flexible supply voltage, not legacy TTL systems. |
Compared with SN74ALS112ADR, SN74LS112N offers identical pinout and function at reduced speed, while SN74HC112DR trades TTL compatibility for wide-voltage operation and ultra-low quiescent power-neither is a true drop-in replacement without verifying timing margins or interface voltage levels.
Availability
SN74ALS112ADR is available at Aetrix Electronics and suitable for industrial control sequencing, digital test equipment counters, legacy computer bus interfaces, and communications protocol state machines requiring stable component supply and long-term obsolescence management.
Supply support for SN74ALS112ADR 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74ALS112ADR belongs to TI's legacy Advanced Low-Power Schottky (ALS) logic family, designed specifically for high-speed, low-power TTL-compatible digital control in commercial-grade systems from the 1980s onward.
FAQ
What is the maximum clock frequency supported by the SN74ALS112ADR?
The SN74ALS112ADR supports a maximum clock frequency of 30 MHz under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This value is specified in the switching characteristics table and validated across process, voltage, and temperature corners for the SOIC (D) package variant. Exceeding 30 MHz may result in setup/hold violations or metastability.
Does the SN74ALS112ADR support 3-state outputs?
No, the SN74ALS112ADR does not support 3-state outputs. It features standard totem-pole push-pull outputs with defined HIGH and LOW drive capability (IOH = −0.4 mA, IOL = 8 mA). The device lacks output-enable (OE) pins or internal tri-state logic; all outputs are always actively driven.
Can the SN74ALS112ADR operate at 3.3 V supply voltage?
No, the SN74ALS112ADR is not rated for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. At 3.3 V, input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) and output drive strength become unreliable, and the device may fail to meet timing or logic-level specifications.
What is the function of the PRE and CLR pins on the SN74ALS112ADR?
PRE (pin 4) and CLR (pin 1) are asynchronous active-low preset and clear inputs for Flip-Flop 1; similarly, PRE (pin 13) and CLR (pin 2) serve Flip-Flop 2. When asserted LOW, they force Q to HIGH or LOW respectively, overriding clock and J/K inputs. Both must be held HIGH for synchronous operation on the negative clock edge.
Is the SN74ALS112ADR pin-compatible with the SN74ALS112AD?
Yes, SN74ALS112ADR and SN74ALS112AD share identical pinout, electrical specifications, and functional behavior. The "R" suffix denotes tape-and-reel packaging (2000 pcs/reel, SOP-NS package), while "D" indicates tube packaging (40 pcs/tube, SOIC-D package); both use the same die and SOIC footprint.
SN74ALS112ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALS
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Set(Preset) and Reset
- Type:
- JK Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 30 MHz
- Max Propagation Delay @ V, Max CL:
- 19ns @ 5V, 50pF
- Trigger Type:
- Negative Edge
- Current - Output High, Low:
- 400µA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4.5 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74ALS112ADR FAQ
1.How can I place an order for SN74ALS112ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALS112ADR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ALS112ADR reliable?
The price and inventory of SN74ALS112ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALS112ADR is usually 5 days.
3.What payment methods are accepted for SN74ALS112ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALS112ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALS112ADR?
SN74ALS112ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALS112ADR order is processed, you will receive an email with the shipment details and tracking number.
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 SN74ALS112ADR?
For technical support, including SN74ALS112ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALS112ADR requirements.
6.How does Aetrix verify that SN74ALS112ADR is sourced from the original manufacturer or authorized distributors?
All SN74ALS112ADR 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 SN74ALS112ADR meets industry standards.
7.What is the process for return or replacement of SN74ALS112ADR?
All SN74ALS112ADR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALS112ADR, 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 SN74ALS112ADR part is unused and in its original packaging.
Return procedure for SN74ALS112ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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