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Renesas 74LS112P-E
- Part No.:
- 74LS112P-E
- Manufacturer:
- Renesas
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
74LS112P-E.pdf
- Description:
- DUAL JK FLIP-FLOP, SET AND RESET
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
74LS112P-E from Renesas Electronics is a dual J-K negative-edge-triggered flip-flop with independent preset and clear inputs, operating at 5 V supply, supporting up to 30 MHz clock frequency, with propagation delays of 11–30 ns, and used in synchronous digital control logic for industrial counters and state machines.
For engineers reviewing the 74LS112P-E datasheet, 74LS112P-E pinout, 74LS112P-E application, or 74LS112P-E equivalent, this device serves as a legacy-compatible, TTL-level sequential logic building block requiring precise edge-triggered timing, low-power 5 V operation, and discrete reset/set control per flip-flop channel.
Technical Context
The 74LS112P-E implements two independent J-K flip-flops sharing no internal signal paths; each has dedicated J, K, clock (CK), preset (PR), and clear (CLR) terminals, with outputs Q and Q̅. Triggering occurs only on the falling edge of CK, ensuring deterministic state updates synchronized to system clock transitions.
Its logic conforms to standard TTL voltage thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), supports fan-out of ≥20 LS-TTL loads, and maintains stable output states during asynchronous PR/CLR assertion-enabling reliable initialization and emergency reset in combinational control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - ensures compatibility with standard 5 V TTL power rails and noise margin stability. |
| Max Clock Frequency | 30 MHz - defines maximum synchronous state update rate for counter or shift-register applications. |
| Propagation Delay | tPLH/tPHL = 11–30 ns - determines worst-case timing budget between clock edge and valid Q/Q̅ output transition. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - guarantees interoperability with LS-TTL and compatible logic families without level shifting. |
| Output Drive | IOL = 8 mA, IOH = –400 µA - supports direct interfacing to multiple LS-TTL inputs or small-signal LEDs without buffering. |
| Operating Temperature | –20 °C to +75 °C - validated for commercial and industrial ambient environments, excluding automotive or extended ranges. |
Pinout & Package
Dual-in-line plastic package (DILP-16 pin), 2.54 mm pitch, 19.2 mm × 6.3 mm body, 16-pin through-hole mounting (Renesas package code PRDP0016AE-B, abbreviation P).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 14, 15 | Logic I/O (J1, K1, CK1, PR1, CLR1, Q1, Q̅1, Q2, Q̅2) | Direct connection points for first and second flip-flop control and data paths; no internal multiplexing. |
| 8 | GND | Signal and power reference ground for all internal logic and output stages. |
| 16 | VCC | +5 V supply input for TTL-compatible core and output drivers; decoupling required near pin. |
| 9, 10, 11, 12, 13 | Logic I/O (CLR2, PR2, J2, CK2, K2) | Second flip-flop's independent control inputs - enables dual-channel asynchronous control without shared resources. |
Key Features
| Feature | Design Value |
|---|---|
| Negative-edge triggering | State changes occur only on falling clock edge - eliminates metastability risk from asynchronous sampling and simplifies timing analysis. |
| Independent preset/clear | Each flip-flop has dedicated PR and CLR - allows selective initialization or forced reset without affecting the other channel. |
| Complementary outputs | Q and Q̅ available simultaneously per channel - eliminates need for external inverters in toggle or feedback configurations. |
| TTL-compatible interface | Meets LS-TTL DC and AC specifications - ensures plug-in compatibility with legacy 74LS family logic without redesign. |
| Non-overlapping reset priority | Preset and clear are active-low and override clock/J/K - provides fail-safe initialization before clocked operation begins. |
Applications
| Industrial Counter Systems | Digital Test Equipment |
|---|---|
Use Scenario: 4-bit binary counter built from cascaded 74LS112P-E devices driving LED displays and relay interfaces. IC Role / Device Role / Timing Role: Edge-triggered state storage element enabling precise count advancement on each clock pulse. Use Value: Guaranteed setup/hold times (20 ns tsu, 0 ns th) ensure reliable counting at 30 MHz without race conditions. |
Use Scenario: Pattern generator in automated test fixtures generating stimulus sequences for ASIC validation. IC Role / Device Role / Timing Role: Synchronous state register holding test vector bits under master clock control. Use Value: Dual independent channels allow parallel generation of two synchronized but distinct bit streams. |
| Legacy Control Panels | Education & Prototyping Labs |
Use Scenario: Machine tool sequencer using discrete 74LS112P-E units to implement step-by-step operational states. IC Role / Device Role / Timing Role: State memory unit storing current machine phase, updated only on defined transition edges. Use Value: Asynchronous preset/clear enables manual override and emergency stop without clock dependency. |
Use Scenario: Undergraduate digital electronics labs constructing finite-state machines on breadboards. IC Role / Device Role / Timing Role: Foundational sequential logic component demonstrating J-K behavior, toggling, and race-free design. Use Value: Through-hole DIP-16 package supports manual wiring and oscilloscope probing of individual pins and waveforms. |
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 | Identical electrical specs and pinout; Texas Instruments' second-source version with same 30 MHz max clock and 11–30 ns delays. | No functional deviation - suitable for cross-manufacturer BOM flexibility where TI distribution is preferred. | Select when sourcing from TI-authorized channels or when matching existing TI-based designs. |
| MC74HC112N | CMOS variant: higher noise immunity (VIL = 1.5 V, VIH = 3.5 V), wider supply range (2–6 V), but slower max clock (20 MHz) and different input thresholds. | Requires level adaptation if interfacing with legacy LS-TTL; unsuitable for 30 MHz operation but better for mixed-voltage or battery-powered systems. | Choose only when upgrading to CMOS benefits is acceptable and timing budget permits 20 MHz ceiling. |
Compared with SN74LS112N, the 74LS112P-E offers identical performance and drop-in compatibility; versus MC74HC112N, it delivers higher speed and true LS-TTL interoperability at the cost of higher static current and narrower supply tolerance.
Availability
74LS112P-E is available at Aetrix Electronics and suitable for industrial counter systems, digital test equipment, legacy control panels, and education & prototyping labs requiring stable component supply and long-term obsolescence management.
Supply support for 74LS112P-E 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
Renesas Electronics Corporation is a global semiconductor manufacturer specializing in microcontrollers, analog, power, and legacy logic solutions for industrial, automotive, and infrastructure markets.
The 74LS112P-E belongs to Renesas' legacy TTL logic product line, designed specifically to maintain backward compatibility with decades-old digital systems while meeting modern reliability and traceability standards.
FAQ
What is the maximum operating frequency of the 74LS112P-E?
The 74LS112P-E supports a maximum clock frequency of 30 MHz under recommended operating conditions (VCC = 5.0 V, Ta = 25 °C). This value is confirmed in the switching characteristics table of the Renesas HD74LS112 datasheet Rev.3.00, and represents the highest guaranteed toggle rate for reliable state transitions without timing violations in the 74LS112P-E.
Does the 74LS112P-E have separate clock inputs for each flip-flop?
No, the 74LS112P-E features two independent J-K flip-flops sharing no internal logic, but each has its own dedicated clock input: pin 3 is CK1 for the first flip-flop and pin 12 is CK2 for the second. This allows fully asynchronous operation of both channels, and is explicitly shown in the pin arrangement diagram on page 2 of the Renesas HD74LS112 datasheet.
Is the 74LS112P-E RoHS compliant?
Yes, the 74LS112P-E meets EU RoHS Directive requirements as confirmed by Renesas Electronics' environmental compliance documentation. The device uses lead-free terminations (Ni/Pd/Au plating) and complies with restricted substance limits, consistent with Renesas' commitment to environmentally responsible manufacturing stated in the datasheet's environmental notice section.
What is the function of pins 4 and 11 on the 74LS112P-E?
Pin 4 is PR1 (preset input for flip-flop 1) and pin 11 is PR2 (preset input for flip-flop 2); both are active-low asynchronous inputs that force Q = H and Q̅ = L regardless of clock or J/K state. Their behavior is defined in the Function Table on page 2 of the Renesas HD74LS112 datasheet, and they operate independently per channel.
Can the 74LS112P-E be used in place of the SN74LS112N?
Yes, the 74LS112P-E is functionally and pinout-compatible with the SN74LS112N: identical pin assignments, electrical specifications (VCC, VIH/VIL, tPLH/tPHL), and timing behavior. Renesas and Texas Instruments jointly maintained LS-family second-sourcing standards, and the 74LS112P-E datasheet confirms full interchangeability in legacy system replacements.
74LS112P-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74LS112P-E FAQ
1.How can I place an order for 74LS112P-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LS112P-E 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 74LS112P-E reliable?
The price and inventory of 74LS112P-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LS112P-E is usually 5 days.
3.What payment methods are accepted for 74LS112P-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LS112P-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LS112P-E?
74LS112P-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LS112P-E 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 74LS112P-E?
For technical support, including 74LS112P-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LS112P-E requirements.
6.How does Aetrix verify that 74LS112P-E is sourced from the original manufacturer or authorized distributors?
All 74LS112P-E 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 74LS112P-E meets industry standards.
7.What is the process for return or replacement of 74LS112P-E?
All 74LS112P-E units undergo pre-shipment inspection (PSI). If there is an issue with 74LS112P-E, 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 74LS112P-E part is unused and in its original packaging.
Return procedure for 74LS112P-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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SN74LVC1G74DCTR
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