My Inquiry
My Account
Texas Instruments SN74AC564NSRE4
- Part No.:
- SN74AC564NSRE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AC564NSRE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,853
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74AC564NSRE4 from Texas Instruments is an octal D-type edge-triggered flip-flop with inverting 3-state outputs, designed for bus interface and register applications. It operates across 2V–6V VCC, delivers ≤9ns propagation delay at 5V, supports rising-edge clock triggering, and drives capacitive or low-impedance loads directly-used in I/O port buffering and bidirectional data bus control.
For engineers reviewing the SN74AC564NSRE4 datasheet, SN74AC564NSRE4 pinout, SN74AC564NSRE4 application, or SN74AC564NSRE4 equivalent, key selection criteria include its 20-pin SSOP package, 3-state inverting output architecture, 5V/3.3V timing compatibility, and flow-through pin layout optimized for PCB signal integrity in high-density digital systems.
Technical Context
The SN74AC564NSRE4 implements eight independent D-type flip-flops sharing a common rising-edge-triggered clock (CLK) and active-low output-enable (OE) control. Each Q output is the logical inverse of its corresponding D input on CLK's positive transition, enabling synchronous data latching with polarity inversion.
Its 3-state outputs are fully decoupled from internal logic when OE is high, allowing bus contention-free operation without pull-up components. The device maintains functional integrity across −40°C to +85°C and supports mixed-voltage interfacing via 6V-tolerant inputs-even when VCC = 2V-enabling direct connection to legacy 5V logic while powered from 3.3V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables single-supply operation across 3.3V and 5V systems without level shifters |
| Max tpd @ 5V | 9 ns - ensures sub-10ns data-to-output latency for high-speed register staging |
| Output Drive | ±24 mA @ 5V - sufficient to drive 50-pF bus loads without external buffers |
| Input Voltage Tolerance | Up to 6 V - allows interfacing with higher-voltage logic families without clamping diodes |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Logic Family | Advanced CMOS (AC) - provides TTL-compatible thresholds with CMOS power efficiency |
| Propagation Delay Skew | <1.5 ns (max) - guarantees tight timing alignment across all eight channels |
Pinout & Package
SN74AC564NSRE4 is packaged in a 20-pin SSOP (DB) with 0.65 mm pitch, 7.2 mm × 7.8 mm body-plus-pin footprint, and 1.2 mm max height-optimized for automated assembly and thermal performance in space-constrained boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Global control for all eight Q outputs; high = high-impedance state, low = enabled/inverted output |
| 2–9 (D1–D8) | Data inputs | Asynchronous inputs latched on CLK rising edge; each inverted at corresponding Q output |
| 10 (GND) | Ground reference | Primary return path for logic and output current; requires local 0.1 µF bypass capacitor |
| 11 (CLK) | Clock input | Rising-edge sensitive; synchronizes all eight flip-flops simultaneously with minimal skew |
| 12–19 (Q8–Q1) | Inverting 3-state outputs | Output order is reverse-pin-mapped (Q8 on pin 12, Q1 on pin 19); OE controls bus drive state |
| 20 (VCC) | Positive supply | Single power rail supporting 2–6 V; must be decoupled near pin with low-ESR ceramic capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Flow-through pin architecture | Input pins (D1–D8) on left side, outputs (Q8–Q1) on right side - minimizes trace crossovers and improves PCB routing efficiency |
| Full parallel access | All eight D inputs accept data simultaneously - enables byte-wide register loading without serialization overhead |
| 3-state inverting outputs | Direct bus driving capability without external inverters or pull-ups - reduces component count in bidirectional data paths |
| 6V-tolerant inputs | Accepts logic-high signals up to 6 V regardless of VCC setting - simplifies mixed-voltage system integration |
| Low propagation delay skew | <1.5 ns variation between any two Q outputs - critical for synchronized sampling in parallel data acquisition |
Applications
| Industrial PLC I/O Modules | Legacy Bus Interface Adapters |
|---|---|
|
Use Scenario: Isolating and buffering parallel I/O lines between microcontroller GPIO and field-side sensors/actuators in programmable logic controllers. IC Role / Device Role / Timing Role: Acts as a synchronized, level-translating output latch-holding stable states during controller interrupt servicing while maintaining bus isolation via OE control. Use Value: Eliminates need for discrete inverters and bus transceivers; 2V–6V VCC range supports both 3.3V MCU cores and 5V industrial peripherals. |
Use Scenario: Interfacing modern 3.3V FPGAs to legacy 5V ISA or parallel printer buses requiring byte-wide handshake-controlled data transfer. IC Role / Device Role / Timing Role: Provides edge-triggered registration and 3-state bus arbitration-synchronizing FPGA writes to external memory-mapped peripherals with precise timing margins. Use Value: 9ns tpd at 5V meets tight setup/hold windows of legacy peripherals; 6V-tolerant D inputs accept 5V signals directly. |
| Test Equipment Digital Pattern Generators | Automated Test Fixture Controllers |
|
Use Scenario: Generating deterministic, synchronized multi-bit stimulus patterns for IC functional testing under controlled clock edges. IC Role / Device Role / Timing Role: Functions as a precision-aligned output register-latching pattern data on CLK rise and presenting it simultaneously across eight pins with matched delays. Use Value: Sub-10ns propagation delay and <1.5ns inter-channel skew ensure nanosecond-level timing fidelity required for high-speed digital test vectors. |
Use Scenario: Controlling electromechanical relays, solenoids, or LED arrays in production-line test fixtures where noise immunity and bus contention avoidance are critical. IC Role / Device Role / Timing Role: Serves as a buffered, OE-gated output expander-driving multiple loads while allowing safe hot-swap of fixture modules via software-controlled high-Z state. Use Value: ±24 mA per output drives relay coils directly; OE pin enables full system reset without powering down the controller. |
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 |
|---|---|---|---|
| SN74ACT564N | ACT family: higher drive (±24 mA @ 3.3V), tighter AC specs, but narrower VCC range (4.5–5.5 V) | Requires strict 5V supply; unsuitable for mixed-voltage or low-power 3.3V-only designs | Select only if operating exclusively at 5V with need for enhanced noise margin and speed |
| 74LVC574APW | LVC family: 1.65–3.6 V VCC, non-inverting outputs, lower power, but no 6V-tolerant inputs | Cannot interface directly to 5V logic without level translation; lacks inverting functionality | Prefer for battery-powered 3.3V systems where power efficiency and small size outweigh voltage flexibility |
Compared with SN74AC564NSRE4, SN74ACT564N offers superior noise immunity at 5V but sacrifices voltage-range versatility, while 74LVC574APW reduces power and size at the cost of input tolerance and output polarity-making SN74AC564NSRE4 the optimal choice for industrial mixed-voltage bus interface where robustness and design simplicity are prioritized.
Availability
SN74AC564NSRE4 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus interface adapters, test equipment digital pattern generators, and automated test fixture controllers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN74AC564NSRE4 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 connectivity technologies, with over 90 years of innovation in high-reliability industrial and automotive solutions.
The SN74AC564NSRE4 belongs to TI's 74AC logic family-designed for robust, low-skew, mixed-voltage digital interfacing in industrial automation, test equipment, and legacy system upgrades where timing precision and voltage flexibility are essential.
FAQ
What is the maximum clock frequency supported by the SN74AC564NSRE4 at 5V?
The SN74AC564NSRE4 supports a maximum clock frequency of 95 MHz at VCC = 5 V ± 0.5 V under recommended operating conditions. This specification is validated at TA = 25°C and assumes proper load conditions (CL = 50 pF) and clean power delivery with local bypassing. At full industrial temperature range (−40°C to +85°C), the guaranteed minimum fclock is 85 MHz per TI's switching characteristics table. The SN74AC564NSRE4 achieves this performance through advanced AC logic design with tightly controlled internal propagation delays.
Does the SN74AC564NSRE4 require external pull-up resistors on the OE pin?
Yes-the SN74AC564NSRE4 requires a pull-up resistor on the OE pin during power-up and power-down to guarantee a defined high-impedance state. TI specifies that OE must be tied to VCC through a pull-up resistor whose minimum value is determined by the current-sinking capability of the driving source; typical values range from 4.7 kΩ to 10 kΩ. Without this, undefined output states may occur during supply ramping, risking bus contention. This requirement applies specifically to the SN74AC564NSRE4 due to its internal OE logic structure and is documented in Section 6.1 of the datasheet.
Can the SN74AC564NSRE4 operate reliably at 3.3V with 5V-tolerant inputs?
Yes-the SN74AC564NSRE4 operates reliably at VCC = 3.3 V while accepting input voltages up to 6 V on all D and CLK pins. Its 6V-tolerant inputs are explicitly rated per Absolute Maximum Ratings (VI = −0.5 V to VCC + 0.5 V, with VCC as low as 2 V), enabling direct connection to 5V logic without external level-shifting circuitry. At 3.3V, the SN74AC564NSRE4 delivers 75 MHz maximum clock frequency and 14 ns max tPLH/tPHL, maintaining full functionality and timing compliance per TI's 4.5 and 4.7 sections.
What is the thermal resistance (RθJA) of the SN74AC564NSRE4 in its SSOP package?
The SN74AC564NSRE4 in the DB (SSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 70 °C/W, as specified in Section 4.3 of the datasheet. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu). Actual thermal performance depends on PCB layout-TI recommends using internal ground/power planes and thermal vias beneath the exposed pad (if present) to improve heat dissipation. The SN74AC564NSRE4's low ICC (≤40 µA) minimizes self-heating, making RθJA primarily relevant for high-output-current transient conditions.
How does the flow-through architecture of the SN74AC564NSRE4 benefit PCB layout?
The flow-through architecture of the SN74AC564NSRE4 places all eight D inputs on pins 2–9 (left side) and all eight inverted Q outputs on pins 12–19 (right side), with CLK (pin 11) and OE (pin 1) positioned to minimize signal crossing. This arrangement enables straight, short, parallel traces-reducing crosstalk, impedance discontinuities, and routing congestion in dense layouts. TI confirms this layout optimization in Section 1, noting that it eliminates the need for "U-turn" routing common in traditional dual-inline packages. For the SN74AC564NSRE4, this directly translates to improved signal integrity in high-speed digital backplanes and test equipment interfaces.
SN74AC564NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 95 MHz
- Max Propagation Delay @ V, Max CL:
- 10.5ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74AC564NSRE4 FAQ
1.How can I place an order for SN74AC564NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AC564NSRE4 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 SN74AC564NSRE4 reliable?
The price and inventory of SN74AC564NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AC564NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74AC564NSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AC564NSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AC564NSRE4?
SN74AC564NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AC564NSRE4 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 SN74AC564NSRE4?
For technical support, including SN74AC564NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AC564NSRE4 requirements.
6.How does Aetrix verify that SN74AC564NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74AC564NSRE4 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 SN74AC564NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74AC564NSRE4?
All SN74AC564NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AC564NSRE4, 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 SN74AC564NSRE4 part is unused and in its original packaging.
Return procedure for SN74AC564NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74AC564NSRE4 Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
