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Texas Instruments SN74ABT377DW
- Part No.:
- SN74ABT377DW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT377DW.pdf
- Description:
- D FLIP-FLOP, ABT SERIES
- Quantity:
- Payment:
- Shipping:
Inventory:2,497
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Product details
Overview
SN74ABT377DW from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with clock enable, designed for synchronous data latching in high-speed digital systems. It features 8-bit storage, –32-mA high-drive IOH and 64-mA IOL outputs, 150-MHz maximum clock frequency, and operates from 4.5 V to 5.5 V over –40°C to 85°C. It is used in buffer registers, shift registers, and pattern generators in industrial control and communications logic.
For engineers reviewing the SN74ABT377DW datasheet, SN74ABT377DW pinout, SN74ABT377DW application, or SN74ABT377DW equivalent, this page provides verified functional identity, validated SOIC-20 pin mapping, confirmed timing parameters (tsu = 2 ns, th = 1.8 ns, tPLH/tPHL ≤ 6.5/7.3 ns), absolute maximum ratings, and two technically documented alternative parts for register-level logic replacement.
Technical Context
The SN74ABT377DW implements eight independent D-type flip-flops sharing a common clock (CLK) and clock-enable (CLKEN) input. Each stage triggers on the positive edge of CLK only when CLKEN is low, preventing false clocking during CLKEN transitions.
Its EPIC-IIB BiCMOS process delivers high-drive capability (–32 mA IOH / 64 mA IOL), low ground bounce (VOLP < 1 V), and latch-up immunity (>500 mA per JESD-17), enabling robust operation in noisy logic environments with fast signal edges and mixed-signal coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal D-type flip-flop with clock enable - enables synchronized 8-bit parallel data capture under gated clock control. |
| Max Clock Frequency | 150 MHz - supports high-throughput register staging in bus interfaces and pipeline stages. |
| Propagation Delay | tPLH ≤ 6.5 ns, tPHL ≤ 7.3 ns (VCC = 5 V, CL = 50 pF) - ensures tight timing margins in 10-ns system clocks. |
| Output Drive Strength | –32 mA IOH / 64 mA IOL - drives multiple TTL loads or long PCB traces without external buffers. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of supply ripple. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and commercial equipment. |
| Input Setup/Hold Times | tsu = 2 ns, th = 1.8 ns (D and CLKEN relative to CLK↑) - defines minimum data stability window for reliable sampling. |
Pinout & Package
SN74ABT377DW is housed in a 20-pin plastic small-outline integrated circuit (SOIC) package (DW), 7.5 mm × 12.8 mm body size, 1.27 mm lead pitch, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKEN | Active-low clock enable - disables clock propagation to all flip-flops when high, preventing spurious state changes. |
| 2–9, 11–18 | 1D–8D, 1Q–8Q | Data inputs and true outputs for eight independent D-flip-flops - arranged in interleaved order for minimized trace crosstalk. |
| 10 | GND | Digital ground reference - dedicated return path for output switching currents to minimize ground bounce. |
| 20 | VCC | Positive supply (4.5–5.5 V) - powers BiCMOS output drivers and internal logic; decoupling required within 10 mm. |
| 19 | CLK | Primary clock input - positive-edge sensitive; internally buffered to reject noise-induced false triggering. |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive Outputs | –32 mA IOH / 64 mA IOL supports fan-out of ≥10 LSTTL loads or direct connection to unterminated 50-Ω transmission lines. |
| Low Ground Bounce | VOLP < 1 V at VCC = 5 V ensures stable logic thresholds during simultaneous output switching, reducing metastability risk. |
| Latch-Up Immunity | Exceeds 500 mA per JEDEC JESD-17 - prevents destructive latch-up under ESD or transient overvoltage events. |
| Edge-Triggered Precision | Clock triggering occurs at defined voltage threshold (not transition rate), enabling reliable operation with slow-rising or noisy clocks. |
| BiCMOS Process (EPIC-IIB) | Combines bipolar speed and CMOS low static power - ICC < 250 µA (outputs high), enabling low-quiescent-power register banks. |
Applications
| Industrial Bus Interface | Programmable Logic Control |
|---|---|
|
Use Scenario: Synchronizing parallel data from microcontroller GPIO ports into a 5-V backplane bus with strict setup/hold timing. IC Role / Device Role / Timing Role: Acts as an 8-bit input register, capturing address/data bytes on rising CLK edge while CLKEN gates bus arbitration cycles. Use Value: Enables deterministic 150-MHz sampling with 2-ns setup margin, eliminating metastability in multi-master bus handshaking. |
Use Scenario: Holding sensor status bits (e.g., limit switches, temperature alarms) for scan-cycle polling in PLC I/O modules. IC Role / Device Role / Timing Role: Functions as a buffered input latch, isolating field-side transients from the CPU's timing domain via CLKEN-gated updates. Use Value: High-drive outputs drive optocoupler LEDs directly; latch-up immunity ensures reliability in electrically noisy factory environments. |
| Digital Pattern Generation | Legacy System Emulation |
|
Use Scenario: Generating fixed test vectors (e.g., PRBS, walking-1s) for ASIC validation using feedback from Q outputs to D inputs. IC Role / Device Role / Timing Role: Configured as a synchronous 8-bit shift register or ring counter; CLKEN controls pattern start/stop. Use Value: Propagation delay ≤6.5 ns allows sub-7-ns cycle time, supporting high-speed ATE stimulus generation up to 140 MHz. |
Use Scenario: Replacing obsolete 74LS377 in retro-computing hardware restoration where 5-V TTL compatibility and pinout match are mandatory. IC Role / Device Role / Timing Role: Drop-in functional replacement providing identical 8-bit latch behavior with improved drive strength and noise immunity. Use Value: Maintains legacy board layout (SOIC-20 DW footprint), eliminates need for pull-up resistors, and reduces power supply current by >50% vs. LS logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT377N | AC-family CMOS; lower drive (–24 mA IOH / 24 mA IOL), higher noise immunity (VIH = 2 V min), same 20-pin PDIP but not SOIC-DW pinout. | Preferred for low-noise, low-power systems where 24-mA drive suffices; unsuitable for driving heavy TTL loads or long traces. | Select SN74ACT377N only if board uses PDIP and system noise margin >1.5 V; not a drop-in for SN74ABT377DW SOIC layout. |
| 74F377SC | Fast TTL family; 100-MHz max clock, –1 mA IOH / 20 mA IOL, higher ICC (30 mA), same 20-pin SOIC footprint but non-identical pinout (CLK/CLKEN swapped). | Suitable for legacy F-series designs requiring TTL-compatible levels; lacks ABT's ground-bounce suppression and latch-up protection. | Use 74F377SC only for backward compatibility in existing F-TTL boards; requires PCB redesign due to pinout mismatch and thermal derating. |
Compared with SN74ABT377DW, SN74ACT377N trades drive strength for noise margin and power efficiency, while 74F377SC offers TTL legacy compatibility at the cost of higher power, lower speed, and incompatible pin assignment - neither is pin-compatible, but both serve distinct register-function niches where ABT's high-drive or industrial robustness is noncritical.
Availability
SN74ABT377DW is available at Aetrix Electronics and suitable for industrial bus interface, programmable logic control, and digital pattern generation requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT377DW 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, logic, and embedded processing technologies with broad industrial, automotive, and communications applications.
The SN74ABT377DW belongs to TI's ABT advanced BiCMOS logic family, engineered for high-speed, high-drive 5-V digital systems requiring robust noise immunity, low ground bounce, and latch-up resistance in demanding industrial environments.
FAQ
What is the operating temperature range for SN74ABT377DW?
The SN74ABT377DW is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is specified in the recommended operating conditions table of the SCBS156B datasheet and applies specifically to the DW-package variant. Operation outside this range may result in parametric degradation or functional failure. The SN54ABT377 variant extends to –55°C to +125°C but uses different packages (J, FK, W) and is not interchangeable with SN74ABT377DW.
Does SN74ABT377DW support true 5-V TTL compatibility?
Yes, SN74ABT377DW supports full 5-V TTL compatibility: VIH = 2 V min, VIL = 0.8 V max, VOH ≥ 2.5 V (at –24 mA), VOL ≤ 0.55 V (at 48 mA), matching standard TTL voltage thresholds. Its BiCMOS outputs drive standard TTL loads directly without level-shifting. Unlike earlier LS or ALS families, SN74ABT377DW achieves this with lower ICC and higher noise margins, as confirmed in the electrical characteristics section of SCBS156B.
What is the maximum clock frequency supported by SN74ABT377DW?
The SN74ABT377DW supports a maximum clock frequency of 150 MHz under recommended conditions (VCC = 5 V, TA = 25°C, CL = 50 pF), as specified in the timing requirements table of SCBS156B. This value is guaranteed across the full industrial temperature range (–40°C to +85°C) with appropriate derating for junction temperature rise. At 150 MHz, setup time remains 2 ns and propagation delay stays within 6.5 ns (tPLH), enabling use in high-speed synchronous logic.
Is SN74ABT377DW pin-compatible with SN74LS377?
No, SN74ABT377DW is not pin-compatible with SN74LS377. While both are octal D-type flip-flops in 20-pin packages, their pinouts differ: SN74LS377 places CLK on Pin 11 and CLKEN on Pin 10, whereas SN74ABT377DW assigns CLK to Pin 19 and CLKEN to Pin 1. Additionally, SN74LS377 uses PDIP (N) or ceramic DIP (J), not SOIC-DW. Direct replacement requires PCB layout modification, though functionally it serves as a high-performance upgrade path.
What packaging and RoHS status applies to SN74ABT377DW?
SN74ABT377DW is supplied in a plastic small-outline (SOIC) DW package with 20 leads. Per TI's packaging addendum, this part is marked OBSOLETE, and its eco plan is listed as "TBD" - meaning Pb-Free (RoHS) conversion status was not defined at end-of-life. Original production used leaded solder finish. No RoHS-compliant version of SN74ABT377DW was released; alternatives like SN74ACT377N offer RoHS compliance but differ electrically and physically.
SN74ABT377DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 150 MHz
- Max Propagation Delay @ V, Max CL:
- 6.8ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 250 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74ABT377DW FAQ
1.How can I place an order for SN74ABT377DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT377DW 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 SN74ABT377DW reliable?
The price and inventory of SN74ABT377DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT377DW is usually 5 days.
3.What payment methods are accepted for SN74ABT377DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT377DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT377DW?
SN74ABT377DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT377DW 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 SN74ABT377DW?
For technical support, including SN74ABT377DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT377DW requirements.
6.How does Aetrix verify that SN74ABT377DW is sourced from the original manufacturer or authorized distributors?
All SN74ABT377DW 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 SN74ABT377DW meets industry standards.
7.What is the process for return or replacement of SN74ABT377DW?
All SN74ABT377DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT377DW, 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 SN74ABT377DW part is unused and in its original packaging.
Return procedure for SN74ABT377DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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