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Texas Instruments SN74HCT574PWT
- Part No.:
- SN74HCT574PWT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HCT574PWT.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,462
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Product details
Overview
SN74HCT574PWT from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state noninverting outputs, designed for bus interface and data latching in 5V digital systems. It operates from 4.5V to 5.5V, delivers ±6mA output drive, features 22ns typical propagation delay (tpd), and draws ≤80μA quiescent current. It is used in microcontroller I/O expansion, memory address latching, and bidirectional data bus buffering.
For engineers reviewing the SN74HCT574PWT datasheet, SN74HCT574PWT pinout, SN74HCT574PWT application, or SN74HCT574PWT equivalent, key selection criteria include its TTL-compatible inputs, bus-structured 20-pin TSSOP package, 3-state enable control per output group, and guaranteed timing performance at 5V across –40°C to +85°C.
Technical Context
This device implements eight independent D-type flip-flops, each triggered on the low-to-high clock transition. Internal storage is synchronized to CLK, while dual output-enable inputs (1OE and 2OE) independently control two groups of four outputs each, enabling flexible bus arbitration and direction control.
The 3-state outputs support high-current bus driving (up to 15 LSTTL loads), with logic-level compatibility to standard TTL inputs. Its low input current (≤1μA) and CMOS-compatible input thresholds ensure stable interfacing with mixed-logic families without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures robust operation across industrial 5V rail tolerances without regulation. |
| Propagation Delay (tpd) | 22 ns typical at VCC = 5 V, CL = 50 pF - Enables reliable 24 MHz bus clocking in synchronous designs. |
| Output Drive | ±6 mA at VCC = 5 V - Directly drives 15 LSTTL loads without external buffers or pull-ups. |
| Quiescent Current (ICC) | 80 μA max - Supports low-power standby modes in battery-backed or energy-sensitive systems. |
| Input Compatibility | TTL-voltage compatible (VIH = 2 V, VIL = 0.8 V) - Interoperates seamlessly with legacy 74LS and microcontroller GPIOs. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded applications including PLC I/O modules. |
Pinout & Package
TSSOP-20 (PW) package: 6.50 mm × 6.40 mm body, 1.2 mm max height, 0.65 mm lead pitch, exposed thermal pad optional. Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output enable inputs | Independently disable upper/lower 4-bit output groups; high-impedance state prevents bus contention. |
| CLK | Clock input (pins 11 & 19) | Rising-edge sensitive; synchronizes all eight D inputs to Q outputs simultaneously. |
| D1–D8 | Data inputs (pins 2,4,6,8,12,14,16,18) | Bus-structured layout matches standard 8-bit data bus routing; minimizes trace crossovers. |
| Q1–Q8 | Tri-state outputs (pins 3,5,7,9,13,15,17,20) | Noninverting outputs; driven only when respective OE is low; otherwise high-Z. |
| VCC, GND | Power supply pins (pins 20, 10) | Dual power/ground placement supports localized decoupling; 0.1 μF capacitor recommended at VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Octal D-type latch with edge-triggered clock | Synchronizes 8-bit parallel data on rising CLK edge-ideal for address/data capture in microprocessor buses. |
| Dual independent 3-state output enables | 1OE controls Q1–Q4; 2OE controls Q5–Q8-enables half-bus isolation and time-multiplexed peripheral access. |
| Bus-structured pinout | Alternating I/O layout (D/Q/D/Q…) reduces PCB routing congestion and improves signal integrity on dense boards. |
| TTL-compatible input thresholds | VIH = 2 V, VIL = 0.8 V-eliminates need for level shifters when interfacing with 5V microcontrollers or legacy logic. |
| Low ICC and Ci | 80 μA max ICC and 10 pF max input capacitance-minimizes loading on upstream drivers and reduces dynamic power. |
Applications
| Microcontroller I/O Expansion | Memory Address Latching |
|---|---|
Use Scenario: Expanding GPIO count on an ARM Cortex-M0+ MCU with limited native parallel I/O. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch, holding static control signals (e.g., display enable, sensor reset) while freeing MCU pins for other functions. Use Value: Eliminates need for discrete buffers or CPLDs; leverages existing 5V bus timing and simplifies firmware bit-banging. |
Use Scenario: Capturing 8-bit address segments from a Z80 CPU during memory read/write cycles. IC Role / Device Role / Timing Role: Latches lower-address byte on rising CLK edge, holding stable address during full memory access window. Use Value: Meets strict Z80 ADL setup/hold requirements (tsu = 25 ns, th = 5 ns) with margin at 5V. |
| Bidirectional Data Bus Buffering | Industrial PLC Input Register |
Use Scenario: Isolating a shared 8-bit data bus between an FPGA master and multiple slave peripherals. IC Role / Device Role / Timing Role: Provides direction-controlled 3-state buffering using OE signals tied to FPGA control lines. Use Value: Prevents bus contention during read/write transitions; ±6mA drive ensures signal integrity over 10 cm traces. |
Use Scenario: Digitally sampling 8 discrete 24V industrial sensor inputs via optocoupler interfaces. IC Role / Device Role / Timing Role: Serves as input register, capturing synchronized status bits on system clock edge for deterministic polling. Use Value: Guarantees noise-immune sampling with 22ns tpd and 5V logic margin-critical for deterministic scan-cycle timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT374PWR | Identical function and pinout; differs only in output-enable architecture (single OE vs. dual OE). | Lacks independent control of upper/lower 4-bit groups-requires external gating for half-bus isolation. | Select SN74HCT374PWR only if dual OE is unnecessary and board layout favors single-enable routing. |
| 74ACT574MTCX | Higher speed (tpd = 10.5 ns typ), wider VCC range (4.5–5.5 V), but higher ICC (4 mA max) and no dual OE. | Better for high-frequency bus applications (>33 MHz), but unsuitable where low ICC or split-bus control is required. | Choose 74ACT574MTCX only when speed is critical and power budget allows >50× higher quiescent current. |
Compared with SN74HCT574PWT, SN74HCT374PWR offers identical timing and drive but sacrifices bus segmentation flexibility, while 74ACT574MTCX trades significant power efficiency for raw speed-making SN74HCT574PWT optimal for balanced industrial I/O designs.
Availability
SN74HCT574PWT is available at Aetrix Electronics and suitable for industrial PLC I/O modules, microcontroller peripheral expansion, and memory interface latching requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74HCT574PWT 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 decades of expertise in industrial-grade logic families.
SN74HCT574PWT belongs to the SNx4HCT logic series, engineered for robust 5V TTL-compatible operation in industrial control, test equipment, and legacy system upgrades where reliability and interoperability are paramount.
FAQ
What is the operating temperature range for SN74HCT574PWT?
The SN74HCT574PWT is rated for operation from –40°C to +85°C, meeting industrial temperature requirements. This range is validated per TI's recommended operating conditions and applies to the TSSOP-20 (PW) package variant. Thermal derating is not required within this span, and the device maintains full timing and drive specifications across the entire range.
Does SN74HCT574PWT support true bidirectional data flow?
No-SN74HCT574PWT is an octal D-type latch with unidirectional data flow (D → Q) and 3-state outputs. It does not contain internal direction control or transceiver logic. Bidirectional bus operation requires pairing with complementary devices (e.g., SN74HCT245) or external OE coordination; SN74HCT574PWT itself only latches and buffers in one direction.
What is the maximum clock frequency supported by SN74HCT574PWT?
At VCC = 5.5 V and TA = 25°C, SN74HCT574PWT supports a maximum clock frequency of 27 MHz (CL = 50 pF). Under worst-case industrial conditions (VCC = 4.5 V, TA = 85°C), the guaranteed minimum fmax is 20 MHz. These values are derived from timing parameter limits in TI's SCLS177H datasheet Section 4.5.
Can SN74HCT574PWT drive LEDs directly?
No-SN74HCT574PWT is not designed for direct LED driving. Its outputs provide ±6 mA at 5 V, which is insufficient for most indicator LEDs requiring ≥10 mA for visibility. Additionally, the device lacks current-limiting capability and sustained DC output rating beyond its specified ±35 mA absolute maximum per pin. Use dedicated LED drivers or series resistors with external current limiting.
Is SN74HCT574PWT pin-compatible with SN74HCT374PWR?
Yes-SN74HCT574PWT and SN74HCT374PWR share identical pin assignments, package dimensions (TSSOP-20), and electrical characteristics. The only functional difference is that SN74HCT574PWT has two independent output-enable inputs (1OE, 2OE), while SN74HCT374PWR uses a single OE. Pin-for-pin replacement is physically possible, but firmware/hardware must accommodate the OE architecture change.
SN74HCT574PWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 40 MHz
- Max Propagation Delay @ V, Max CL:
- 47ns @ 5.5V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HCT574PWT FAQ
1.How can I place an order for SN74HCT574PWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HCT574PWT 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 SN74HCT574PWT reliable?
The price and inventory of SN74HCT574PWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HCT574PWT is usually 5 days.
3.What payment methods are accepted for SN74HCT574PWT?
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4.How is shipping managed for SN74HCT574PWT?
SN74HCT574PWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HCT574PWT 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 SN74HCT574PWT?
For technical support, including SN74HCT574PWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HCT574PWT requirements.
6.How does Aetrix verify that SN74HCT574PWT is sourced from the original manufacturer or authorized distributors?
All SN74HCT574PWT 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 SN74HCT574PWT meets industry standards.
7.What is the process for return or replacement of SN74HCT574PWT?
All SN74HCT574PWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74HCT574PWT, 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 SN74HCT574PWT part is unused and in its original packaging.
Return procedure for SN74HCT574PWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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