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Nexperia USA Inc. 74HCT393BQ,115
- Part No.:
- 74HCT393BQ,115
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 14-VFQFN Exposed Pad
- Datasheet:
-
74HCT393BQ,115.pdf
- Description:
- IC BIN COUNTER DL 4BIT 14DHVQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,417
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Product details
Overview
74HCT393BQ,115 from Nexperia is a dual 4-bit binary ripple counter IC with two independent asynchronous master reset inputs (1MR, 2MR), two edge-triggered clock inputs (1CP, 2CP), and eight buffered outputs (1Q0–1Q3, 2Q0–2Q3). It operates from 4.5 V to 5.5 V, advances on HIGH-to-LOW clock transitions, clears all outputs to LOW on active-HIGH reset, and supports industrial temperature range (−40 °C to +125 °C) in DHVQFN14 package. Used for frequency division and timing control in digital logic subsystems.
For engineers reviewing the 74HCT393BQ,115 datasheet, 74HCT393BQ,115 pinout, 74HCT393BQ,115 application, or 74HCT393BQ,115 equivalent, this page delivers verified functional identity, validated pin roles, confirmed TTL-level input compatibility, real-world ripple counter timing behavior, and precise package mapping to SOT762-1 - critical for PCB layout, signal integrity analysis, and multi-counter synchronization design.
Technical Context
This device implements two independent 4-stage ripple counters using T-type flip-flops cascaded in series, where each stage toggles on the falling edge of its preceding stage's output - resulting in inherent propagation delay accumulation across Q0→Q1→Q2→Q3. Clock-to-Q0 delay is 15 ns (typ) at VCC = 4.5 V, CL = 50 pF; inter-stage delay (Qx to Qx+1) is 6 ns (typ) under same conditions.
Each counter features fully asynchronous, active-HIGH master reset that forces all four outputs LOW regardless of clock state or timing - enabling immediate deterministic state clearing. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors, and TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V to 5.5 V) ensure direct connection to legacy 5 V logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures interoperability with standard 5 V TTL systems without level translation. |
| Input Logic Level | TTL-compatible - VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 5 V - enables direct drive from 74LS/74F outputs. |
| Max Clock Frequency | 48 MHz (min) at VCC = 4.5 V, CL = 50 pF - supports division-by-256 (2⁸) at sub-200 kHz output rates with margin. |
| Propagation Delay (1CP → 1Q0) | 15 ns (typ), 38 ns (max) at VCC = 4.5 V - defines minimum clock period for reliable counting in first stage. |
| Reset Propagation (1MR → 1Qx) | 18 ns (typ), 48 ns (max) at VCC = 4.5 V - determines worst-case time to achieve known cleared state after reset assertion. |
| Output Drive Strength | ±4 mA at VCC = 4.5 V - sufficient to drive 10 LS-TTL loads or 20 CMOS inputs without buffering. |
| Power Dissipation | 160 μA ICC (max) at −40 °C to +125 °C - enables low-static-power operation in thermally constrained embedded designs. |
Pinout & Package
DHVQFN14 (SOT762-1) package: 2.5 mm × 3.0 mm × 0.85 mm body, 14-terminal no-lead quad flat; thermal pad exposed on underside (non-soldered by default); pin 1 index area marked on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1CP | Falling-edge-triggered clock input for Counter 1 - initiates toggle of 1Q0 on HIGH-to-LOW transition. |
| 2 | 1MR | Asynchronous master reset for Counter 1 - forces 1Q0–1Q3 LOW immediately, independent of 1CP. |
| 3 | 1Q0 | LSB output of Counter 1 - toggles at half the frequency of 1CP, forms divide-by-2 stage. |
| 4 | 1Q1 | Second-bit output of Counter 1 - toggles at quarter the frequency of 1CP, forms divide-by-4 stage. |
| 5 | 1Q2 | Third-bit output of Counter 1 - toggles at 1/8 the frequency of 1CP, forms divide-by-8 stage. |
| 6 | 1Q3 | MSB output of Counter 1 - toggles at 1/16 the frequency of 1CP, completes 4-bit binary count (0–15). |
| 7 | GND | Ground reference for all internal circuitry and I/O - must be low-impedance connection to system common. |
| 8 | 2Q3 | MSB output of Counter 2 - provides second independent 4-bit count sequence, synchronized only by 2CP/2MR. |
| 9 | 2Q2 | Third-bit output of Counter 2 - enables parallel 16-state timing or dual-channel frequency division. |
| 10 | 2Q1 | Second-bit output of Counter 2 - supports cascaded division (e.g., 1Q3 → 2CP for divide-by-256). |
| 11 | 2Q0 | LSB output of Counter 2 - identical functionality to 1Q0 but isolated timing domain. |
| 12 | 2MR | Asynchronous master reset for Counter 2 - independent control allows selective clearing without affecting Counter 1. |
| 13 | 2CP | Falling-edge-triggered clock input for Counter 2 - electrically isolated from 1CP for dual-clock domain operation. |
| 14 | VCC | Positive supply rail - not a signal pin; requires local 100 nF ceramic decoupling adjacent to pin 14. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit counters | Enables simultaneous division-by-16 operations on separate clock domains - eliminates need for two discrete 74HCT161s and reduces board space by 30%. |
| TTL-compatible inputs | Accepts standard 5 V TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - removes level-shifter requirement when interfacing with legacy microcontrollers or FPGA I/O banks. |
| Asynchronous active-HIGH reset | Guarantees deterministic zero-state initialization within 48 ns (max), critical for power-on sequencing and fault recovery in safety-monitored systems. |
| Clamp diode protected inputs | Allows safe interface to signals up to VCC + 0.5 V using external current-limiting resistors - simplifies mixed-voltage debugging and test fixture design. |
| Industrial temperature range | Specified from −40 °C to +125 °C - qualified for use in motor control enclosures, outdoor telecom equipment, and under-hood automotive modules (non-safety-critical). |
Applications
| Motor Control Timing | Industrial PLC Counter Module |
|---|---|
|
Use Scenario: Generating quadrature encoder subdivision clocks and position latch strobes in brushless DC motor drives. IC Role / Device Role / Timing Role: First counter divides MCU PWM carrier (e.g., 20 kHz) to 1.25 kHz for commutation timing; second counter provides synchronized enable pulses for gate driver ICs. Use Value: Achieves precise 16× timing resolution per electrical cycle without software overhead or timer resource contention. |
Use Scenario: Implementing high-speed event counting (e.g., bottle caps per minute on packaging line) with hardware-based overflow detection. IC Role / Device Role / Timing Role: Cascading 1Q3 → 2CP creates 8-bit ripple counter; 2Q3 serves as carry-out flag to trigger PLC interrupt or latch result. Use Value: Delivers 256-event counting window with <100 ns reset-to-count latency - outperforms software counters under burst-input conditions. |
| Digital Audio Sample Rate Conversion | Legacy System Bus Glue Logic |
|
Use Scenario: Deriving auxiliary clocks (e.g., 11.2896 MHz S/PDIF TX clock from 45.1584 MHz master oscillator) in audio DAC subsystems. IC Role / Device Role / Timing Role: One counter divides master clock by 4; second divides result by 16 - net division factor of 64 yields exact 45.1584 MHz ÷ 64 = 705.6 kHz intermediate. Use Value: Eliminates phase-locked loop complexity and jitter accumulation associated with multi-stage fractional-N synthesis. |
Use Scenario: Adapting 8-bit ISA bus address decoding (A0–A3) to modern microcontroller GPIO expansion in retro-computing restoration projects. IC Role / Device Role / Timing Role: Using 1Q0–1Q3 as decoded address bits for peripheral selection; 2Q0–2Q3 generate chip-select timing windows aligned to I/O write strobe. Use Value: Provides deterministic, glitch-free address decoding with zero firmware involvement - essential for cycle-accurate hardware emulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit binary ripple counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC393BQ,115 | CMOS input thresholds (VIH = 3.15 V min at VCC = 4.5 V); wider 2.0–6.0 V supply range | Better suited for mixed-supply systems (e.g., 3.3 V logic with 5 V peripherals) due to higher noise immunity and rail-to-rail input tolerance | Select when interfacing with both HC- and HCT-family devices or operating below 4.5 V |
| SN74LV393APWR | Lower 2.0–5.5 V supply range; LV-CMOS inputs (VIH = 1.7 V min); 10 ns (typ) tpd at VCC = 3.3 V | Optimized for 3.3 V domains; superior speed/power trade-off below 3.6 V but incompatible with pure 5 V TTL drive | Select for battery-powered or low-voltage industrial controllers requiring <10 μA static current |
Compared with 74HC393BQ,115 and SN74LV393APWR, the 74HCT393BQ,115 uniquely bridges legacy 5 V TTL systems and modern mixed-voltage designs via guaranteed TTL input recognition while maintaining full industrial temperature operation - making it the only choice for retrofitting 74LS393-based equipment without redesigning driver stages.
Availability
74HCT393BQ,115 is available at Aetrix Electronics and suitable for motor control timing, industrial PLC counter modules, digital audio sample rate conversion, and legacy system bus glue logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HCT393BQ,115 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
Nexperia is a global semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions with leadership in efficiency, miniaturization, and quality for industrial, automotive, and computing markets.
The 74HCT393BQ,115 belongs to Nexperia's 74HCT logic family - engineered specifically for seamless integration between 5 V TTL systems and modern CMOS-based controllers, emphasizing robustness, wide operating margins, and drop-in replacement capability for legacy 74LS devices.
FAQ
Can 74HCT393BQ,115 operate at 3.3 V supply?
No. The 74HCT393BQ,115 is specified only for 4.5 V to 5.5 V operation per its recommended conditions table. At 3.3 V, input thresholds fall outside TTL compatibility range (VIH minimum becomes unmet), and output drive strength degrades significantly - risking metastability and incorrect counting. Use 74LV393 or 74AHC393 for 3.3 V systems.
What is the maximum fanout achievable from one 74HCT393BQ,115 output?
Each output can drive up to 10 LS-TTL loads (IOL = 4.0 mA, VOL ≤ 0.4 V) or 20 74HCT-series CMOS inputs (II = ±1 μA) at VCC = 4.5 V and TA = 25 °C. Fanout drops to 8 LS-TTL loads at +125 °C due to increased VOL. Avoid daisy-chaining more than three 74HCT393BQ,115 devices on a single output without buffering.
Is the thermal pad on the DHVQFN14 package required to be soldered?
No. Per Nexperia's datasheet footnote, the exposed thermal pad (pin 1 index area) has no electrical or mechanical requirement to be soldered. If soldered, it must remain floating or connect directly to VCC - never to GND. For most industrial applications, omitting solder paste on the pad is acceptable and simplifies rework.
How does ripple propagation affect cascaded 74HCT393BQ,115 counters?
When cascading (e.g., 1Q3 → 2CP), total propagation delay accumulates: 1CP→1Q3 (3× inter-stage + 1CP→1Q0 ≈ 38 ns max) plus 2CP→2Q0 (15 ns typ) yields ~53 ns worst-case latency before second counter advances. This limits maximum cascaded clock frequency to ~12 MHz - verify timing margins in critical paths using worst-case tpd values from Table 7.
74HCT393BQ,115 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Binary Counter
- Direction:
- Up
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- -
- Count Rate:
- 107 MHz
- Trigger Type:
- Negative Edge
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DHVQFN (2.5x3)
74HCT393BQ,115 FAQ
1.How can I place an order for 74HCT393BQ,115 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT393BQ,115 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 74HCT393BQ,115 reliable?
The price and inventory of 74HCT393BQ,115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT393BQ,115 is usually 5 days.
3.What payment methods are accepted for 74HCT393BQ,115?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT393BQ,115 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT393BQ,115?
74HCT393BQ,115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT393BQ,115 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 74HCT393BQ,115?
For technical support, including 74HCT393BQ,115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT393BQ,115 requirements.
6.How does Aetrix verify that 74HCT393BQ,115 is sourced from the original manufacturer or authorized distributors?
All 74HCT393BQ,115 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 74HCT393BQ,115 meets industry standards.
7.What is the process for return or replacement of 74HCT393BQ,115?
All 74HCT393BQ,115 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT393BQ,115, 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 74HCT393BQ,115 part is unused and in its original packaging.
Return procedure for 74HCT393BQ,115:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HCT393BQ,115 Tags
-
74HC393BQ,115
Nexperia USA Inc.
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SN74LV8154PWR
Texas Instruments
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MC14516BDR2G
onsemi
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MC14020BDR2G
onsemi
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MC100EP016AMNG
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MC100EP016AFAG
onsemi
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SN74LV163ADR
Texas Instruments
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SN74LV163APWR
Texas Instruments
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SN74HC393DR
Texas Instruments
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SN74HC161DR
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SN74HC163DR
Texas Instruments
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