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Texas Instruments SN74AHCT16374DGGR
- Part No.:
- SN74AHCT16374DGGR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
SN74AHCT16374DGGR.pdf
- Description:
- IC FF D-TYPE DUAL 8BIT 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,038
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Product details
Overview
SN74AHCT16374 from Texas Instruments is a 16-bit edge-triggered D-type flip-flop with 3-state outputs, designed for high-capacitance bus driving in industrial and embedded systems. It operates at 4.5–5.5 V, supports TTL-compatible inputs, features dual 8-bit or unified 16-bit operation, and delivers ±8 mA output drive at 5 V - enabling direct interface with legacy buses without pull-ups.
For engineers reviewing the SN74AHCT16374 datasheet, SN74AHCT16374 pinout, SN74AHCT16374 application, or SN74AHCT16374 equivalent, key selection criteria include its 2.5 ns data setup/hold timing, 10.5 ns max propagation delay (CL = 15 pF), 3-state enable control logic, and TSSOP-48 package compatibility with high-density PCB layouts.
Technical Context
This device implements two independent 8-bit positive-edge-triggered D-flip-flop sections sharing separate clock (CLK) and output-enable (OE) controls per section. Each section latches D-inputs on the rising edge of its CLK while OE governs high-impedance or active-drive state of its eight Q outputs - enabling bidirectional bus arbitration and latch-through buffering.
Its EPIC™ CMOS process ensures TTL-voltage compatibility (VIH = 2 V, VIL = 0.8 V), distributed VCC/GND pins suppress switching noise, and flow-through pinout minimizes trace crossovers. Latch-up immunity exceeds 250 mA per JESD 17, and ESD protection meets 2000 V (HBM) and 200 V (MM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | AHCT - TTL-compatible CMOS with 5 V supply only; enables direct replacement of 74LS devices without level shifters. |
| Operating Voltage | 4.5–5.5 V - fixed single-supply operation; not 3.3 V tolerant; requires stable 5 V rail. |
| Propagation Delay | ≤10.5 ns (CL = 15 pF) - supports >80 MHz bus clocking with margin for routing skew. |
| Output Drive | ±8 mA (IOH/IOL) - sufficient to drive 50 Ω transmission lines or 10+ LS-TTL loads directly. |
| Timing Margins | tsu/th = 2.5 ns each - tight setup/hold window demands clean, low-jitter clock edges. |
| 3-State Enable | OE-controlled high-Z outputs - allows dynamic bus release without affecting internal latch state. |
| Package | TSSOP-48 (DGG) - 0.5 mm pitch, 12.6 × 6.1 mm footprint; optimized for automated assembly and thermal dissipation (θJA = 70°C/W). |
Pinout & Package
TSSOP-48 (DGG) package: 12.6 mm × 6.1 mm × 1.2 mm body, 0.5 mm lead pitch, gull-wing leads, JEDEC MO-153 compliant. Pin 1 marked via top-side bevel; moisture sensitivity level 1 (260°C reflow unlimited).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Section output-enable control | Active-low enable; asserts high-impedance on respective 8-bit Q-bus when high - critical for bus contention avoidance. |
| 1CLK, 2CLK | Section clock input | Rising-edge sensitive; clocks corresponding D-inputs into Q outputs; asynchronous to other section. |
| 1D1–1D8, 2D1–2D8 | Data inputs | Parallel 16-bit data path; TTL-compatible thresholds allow direct connection to microcontroller GPIO or legacy logic. |
| 1Q1–1Q8, 2Q1–2Q8 | Registered outputs | Edge-aligned, 3-state outputs; support hot-swap bus insertion and multi-drop termination schemes. |
| VCC, GND | Power distribution | Dual VCC/GND pairs per side minimize ground bounce; decoupling required within 10 mm of each VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through architecture | Input-to-output pin alignment across package width reduces layer count and signal crosstalk in dense PCB routing. |
| Distributed power pins | Multiple VCC/GND placements lower simultaneous switching noise (SSN) by up to 40% vs. corner-fed packages. |
| TTL-compatible inputs | Accepts 0.8 V/2.0 V thresholds - eliminates need for external level translators when interfacing with 74LS, 74F, or MCU I/O. |
| Latch-up immunity | Exceeds 250 mA per JESD 17 - ensures robustness in noisy industrial environments with transient coupling. |
| High-Z retention mode | OE assertion preserves internal Q-state; allows data update or hold during bus arbitration without glitching. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Bridge |
|---|---|
Use Scenario: Adding isolated digital input/output channels to programmable logic controllers using backplane parallel buses. IC Role / Device Role / Timing Role: Acts as synchronized input latch and output driver; samples field sensors on CLK edge and drives actuators via 3-state bus control. Use Value: Enables deterministic 2.5 ns input capture timing and ±8 mA drive into 1000 pF bus loads - eliminating external buffers and reducing BOM cost. | Use Scenario: Interfacing modern microcontrollers to legacy ISA or VMEbus peripherals requiring 5 V, high-drive, edge-triggered registers. IC Role / Device Role / Timing Role: Serves as protocol-transparent data register; accepts CPU writes via OE-gated bus and presents synchronized reads on CLK edge. Use Value: Provides pin-level compatibility with 74LS374 while delivering lower power and higher noise immunity - easing drop-in upgrades. |
| Memory-Mapped Peripheral Buffer | Test Equipment Signal Conditioning |
Use Scenario: Buffering address/data lines between FPGA fabric and external SRAM or flash memory in embedded instrumentation. IC Role / Device Role / Timing Role: Functions as write-data latch and read-data synchronizer; isolates memory bus from FPGA timing jitter during burst transfers. Use Value: Delivers 10.5 ns tPLH/tPHL ensuring setup compliance for 25 ns SRAM access cycles - removing timing closure risk in mixed-signal designs. | Use Scenario: Capturing and holding analog-to-digital converter outputs in automated test equipment before serial upload to host controller. IC Role / Device Role / Timing Role: Operates as acquisition register; freezes ADC sample on CLK edge and holds value until host reads via shared bus controlled by OE. Use Value: Supports concurrent sampling and readout via independent OE/CLK control - enabling continuous acquisition without data loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit registered buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT16244DGGR | Non-latching 16-bit buffer; no clock or storage function - only level translation and drive boost. | Suitable for static signal buffering but cannot replace timing-critical register functions like sample-hold or pipeline stages. | Select when bus isolation without state retention is required; avoid where edge-triggered synchronization is mandatory. |
| SN74LVC16374DGGR | 3.3 V only (1.65–3.6 V); LVCMOS input thresholds; 24 mA drive; 3.5 ns propagation delay. | Designed for low-voltage, high-speed systems; incompatible with 5 V buses unless level-shifted. | Choose for new 3.3 V designs needing faster timing; not a drop-in replacement due to voltage and threshold mismatch. |
Compared with SN74AHCT16374, SN74AHCT16244DGGR lacks clocked storage and thus cannot implement synchronous data capture, while SN74LVC16374DGGR requires full 3.3 V system integration and offers higher speed at the cost of 5 V interoperability - making SN74AHCT16374 the sole option for TTL-compatible, 5 V, edge-triggered 16-bit registration.
Availability
SN74AHCT16374 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface bridges, memory-mapped peripheral buffering, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for SN74AHCT16374 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT16374 belongs to TI's Widebus™ family of high-drive, noise-immune bus interface ICs - engineered specifically for reliable 5 V system interconnect in electrically harsh environments.
FAQ
What is the maximum operating frequency of the SN74AHCT16374?
The SN74AHCT16374 supports a maximum clock frequency of 80 MHz under recommended conditions (VCC = 5 V, CL = 50 pF), based on its 75 ns minimum clock pulse width and 11.5 ns max propagation delay. This limit ensures reliable setup/hold timing margins and accounts for board-level signal integrity constraints in real-world layouts.
Can the SN74AHCT16374 operate at 3.3 V?
No, the SN74AHCT16374 is not rated for 3.3 V operation. Its absolute maximum supply voltage is 7 V, but the recommended operating range is strictly 4.5–5.5 V. Operating below 4.5 V risks failure to meet VIH/VIL thresholds and may cause metastability or incomplete output transitions - use SN74LVC16374 for 3.3 V systems.
How should OE be handled during power-up to prevent bus contention?
To ensure high-impedance outputs at power-up, OE must be tied to VCC through a pullup resistor. TI specifies the minimum resistance based on the driver's current-sinking capability; a 10 kΩ resistor is commonly used. This prevents unintended low-impedance drive states that could short bus lines before firmware initializes the device.
Does the SN74AHCT16374 support hot-swap insertion on a live bus?
The SN74AHCT16374 supports hot-swap operation only when OE is held high (disabled) prior to insertion. Its 3-state outputs and robust ESD protection (2000 V HBM) allow safe connection to powered buses, but clock or data signals must remain inactive until after power stabilization and OE assertion - uncontrolled CLK edges during insertion may corrupt internal state.
What is the thermal performance of the SN74AHCT16374 in TSSOP-48 package?
The SN74AHCT16374 in DGG package has a junction-to-ambient thermal resistance (θJA) of 70°C/W under standard JEDEC test conditions. With typical power dissipation below 40 mW at 10 MHz, this allows operation up to 85°C ambient without heatsinking - provided two 100 nF ceramic decoupling capacitors are placed within 5 mm of each VCC pin.
SN74AHCT16374DGGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 2
- Number of Bits per Element:
- 8
- Clock Frequency:
- 130 MHz
- Max Propagation Delay @ V, Max CL:
- 10.4ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 2.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSSOP
SN74AHCT16374DGGR FAQ
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6.How does Aetrix verify that SN74AHCT16374DGGR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT16374DGGR 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 SN74AHCT16374DGGR meets industry standards.
7.What is the process for return or replacement of SN74AHCT16374DGGR?
All SN74AHCT16374DGGR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT16374DGGR, 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 SN74AHCT16374DGGR part is unused and in its original packaging.
Return procedure for SN74AHCT16374DGGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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