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Nexperia USA Inc. 74HCT390PWHL
- Part No.:
- 74HCT390PWHL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HCT390PWHL.pdf
- Description:
- IC DECADE COUNT DL 4BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
74HCT390PWHL from Nexperia is a dual 4-bit decade ripple counter IC with two independent divide-by-2 and two divide-by-5 sections, operating at 4.5 V to 5.5 V supply, supporting BCD or bi-quinary counting modes, and used in frequency division and digital timing circuits for industrial control panels and instrumentation displays.
For engineers reviewing the 74HCT390PWHL datasheet, 74HCT390PWHL pinout, 74HCT390PWHL application, or 74HCT390PWHL equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2.0 V min), asynchronous master reset per counter section, HIGH-to-LOW edge-triggered clocks, propagation delays down to 18 ns (VCC = 4.5 V), and TSSOP16 packaging for high-density PCB layouts.
Technical Context
The device implements two physically separate 4-bit ripple counters, each composed of cascaded flip-flops: one configured as a divide-by-2 stage followed by a divide-by-5 stage (or vice versa), enabling flexible modulus-10 counting via external feedback (nQ0→nCP1 for BCD, nQ3→nCP0 for bi-quinary). Each section has dedicated clock inputs (1CP0/1CP1, 2CP0/2CP1) and individual master reset (1MR/2MR).
It operates strictly on HIGH-to-LOW clock transitions, features TTL-level input compatibility (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), and delivers rail-to-rail CMOS outputs with VOH ≥ 3.98 V and VOL ≤ 0.26 V under 4 mA load - ensuring robust interfacing with legacy TTL and modern 5 V logic systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL and mixed-signal systems without level-shifting. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - enables direct connection to 5 V TTL outputs without interface circuitry. |
| Max Clock Frequency | 55 MHz at VCC = 4.5 V - supports high-speed frequency division up to ÷100 in cascade configurations. |
| Propagation Delay | 18 ns (nCP0 → nQ0, VCC = 4.5 V) - determines minimum clock period and timing margin in synchronous designs. |
| Operating Temperature | -40 °C to +125 °C - qualified for extended industrial environments including motor drives and power supplies. |
| Output Drive | ±4 mA - sufficient to drive multiple 74-series TTL inputs or small LED indicators directly. |
| Power Dissipation | 21 pF CPD - enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal design. |
Pinout & Package
TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, body width 4.4 mm, lead pitch 0.65 mm - optimized for automated assembly and space-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1CP0, 2CP0 | Divide-by-2 clock input | HIGH-to-LOW edge-triggered; initiates toggle of Q0 output in respective counter section. |
| 1CP1, 2CP1 | Divide-by-5 clock input | HIGH-to-LOW edge-triggered; advances Q1–Q3 outputs after Q0 toggles (ripple chain). |
| 1MR, 2MR | Asynchronous master reset | Active HIGH; forces all four outputs (Q0–Q3) LOW independently per section, overriding clock. |
| 1Q0–1Q3, 2Q0–2Q3 | Flip-flop outputs | BCD-coded (Q3Q2Q1Q0) or bi-quinary outputs; drive downstream logic or display decoders directly. |
| VCC (Pin 16) | Positive supply | 4.5–5.5 V input; powers internal CMOS circuitry and defines logic HIGH reference. |
| GND (Pin 8) | Ground reference | 0 V return path; must be low-impedance to minimize ground bounce in ripple-counting operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent decade counters | Two fully isolated 4-bit sections enable simultaneous ÷10 operations or cascaded ÷100 division without external gating. |
| Configurable counting mode | Hardware-selectable BCD (nQ0→nCP1) or bi-quinary (nQ3→nCP0) via PCB trace routing - no firmware or configuration registers needed. |
| TTL-compatible inputs | VIH = 2.0 V min allows direct interfacing with 74LS/74F outputs; eliminates need for pull-up resistors or level shifters. |
| Asynchronous reset per section | 1MR and 2MR allow independent clearing of each decade counter - critical for multi-channel timing synchronization. |
| High noise immunity | Guaranteed 400 mV noise margin at VCC = 5 V - maintains reliable operation in electrically noisy industrial enclosures. |
Applications
| Industrial Counter Displays | Frequency Division in Test Equipment |
|---|---|
|
Use Scenario: Digital panel meters and rotary encoder interfaces in PLC-based machine controls require precise decade counting for position or cycle tracking. IC Role / Device Role / Timing Role: Acts as primary BCD counter feeding 7-segment decoder; receives quadrature-encoded pulses from encoders via Schmitt-trigger conditioning. Use Value: Eliminates microcontroller interrupt overhead by providing hardware-based modulo-10 counting with deterministic latency (<22 ns). |
Use Scenario: Signal generators and frequency synthesizers use cascaded dividers to generate sub-harmonics from a stable crystal oscillator. IC Role / Device Role / Timing Role: Provides first-stage ÷10 and second-stage ÷10 division (total ÷100); driven by 10 MHz reference to produce 100 kHz clean square wave. Use Value: Achieves jitter-free division without PLL lock time or phase ambiguity - essential for calibration-grade instruments. |
| Bi-Quinary Logic in Legacy Systems | Reset-Synchronized Event Timers |
|
Use Scenario: Retrofitting aging electromechanical relay logic with solid-state equivalents in utility metering and elevator control cabinets. IC Role / Device Role / Timing Role: Implements bi-quinary decade counting (Q0 = units, Q3 = fives) to match legacy contact-closure decoding schemes. Use Value: Maintains functional equivalence with original relay logic while improving reliability and reducing maintenance intervals. |
Use Scenario: Programmable logic controllers require synchronized start/stop of multiple timed sequences upon system reset or fault recovery. IC Role / Device Role / Timing Role: Uses 1MR and 2MR to simultaneously clear both counters at power-on or watchdog timeout, ensuring deterministic initial state. Use Value: Guarantees zero-count startup across all timing channels - prevents race conditions in safety-critical sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar decade counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC390PW | CMOS-level inputs (VIH = 3.15 V min at VCC = 4.5 V); higher noise margin but incompatible with 5 V TTL outputs. | Requires level-shifting when interfacing with legacy 74LS logic; suitable only in pure CMOS 5 V systems. | Select only if entire system uses HC logic family and no TTL components are present. |
| SN74LS390N | Bipolar TTL technology; VIH = 2.0 V, but ICC = 30 mA typical - 10× higher static power than 74HCT390PWHL. | Generates significant heat in dense layouts; unsuitable for thermally constrained enclosures or battery-backed systems. | Choose only for drop-in replacement in legacy LS-based boards where power dissipation is not constrained. |
Compared with 74HC390PW, the 74HCT390PWHL offers guaranteed TTL input compatibility without external biasing; compared with SN74LS390N, it reduces supply current from 30 mA to <160 μA, enabling fanless industrial designs.
Availability
74HCT390PWHL is available at Aetrix Electronics and suitable for industrial control panels, test equipment signal chains, utility metering interfaces, and legacy system retrofits requiring stable component supply over extended product lifecycles.
Supply support for 74HCT390PWHL 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 logic, analog, and discrete components with focus on efficiency, reliability, and sustainability.
The 74HCT390 belongs to Nexperia's industry-standard logic portfolio, designed specifically for interoperability with legacy TTL systems while delivering CMOS power efficiency in industrial automation and instrumentation.
FAQ
What is the maximum clock frequency supported by 74HCT390PWHL?
The 74HCT390PWHL supports a maximum clock frequency of 55 MHz at VCC = 4.5 V and CL = 15 pF, as specified in Table 8 of the datasheet. At VCC = 5.0 V and CL = 15 pF, the maximum frequency increases to 61 MHz. These values assume proper PCB layout with controlled impedance and minimal capacitive loading on clock lines.
Can 74HCT390PWHL be used with 3.3 V logic systems?
No - the 74HCT390PWHL is specified only for 4.5 V to 5.5 V operation. Its TTL-compatible inputs require VIH ≥ 2.0 V, but VCC must be within the rated range to guarantee VOH ≥ 3.98 V and VOL ≤ 0.26 V. Using it at 3.3 V violates recommended operating conditions and risks unreliable output levels and increased propagation delay.
How does the bi-quinary counting mode differ from BCD mode in practice?
In BCD mode, nQ0 feeds nCP1 to produce standard 0–9 binary-coded decimal output (Q3Q2Q1Q0). In bi-quinary mode, nQ3 feeds nCP0, yielding outputs where Q0 toggles every 5 counts and Q3 indicates the "five" state - matching legacy relay logic that used separate 0–4 and 5–9 contact groups. Both modes use identical hardware; only external feedback routing differs.
Is the 74HCT390PWHL pin-compatible with SO16-packaged variants?
Yes - the 74HCT390PWHL (TSSOP16/SOT403-1) shares identical pin numbering and function mapping with the SO16 variant (74HCT390D/SOT109-1), as confirmed in Figures 3 and 4 of the datasheet. However, PCB footprints are not interchangeable due to different land patterns, pitch (0.65 mm vs. 1.27 mm), and body dimensions.
74HCT390PWHL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Counter, Decade
- Direction:
- Up
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- -
- Count Rate:
- 61 MHz
- Trigger Type:
- Negative Edge
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74HCT390PWHL FAQ
1.How can I place an order for 74HCT390PWHL through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT390PWHL 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 74HCT390PWHL reliable?
The price and inventory of 74HCT390PWHL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT390PWHL is usually 5 days.
3.What payment methods are accepted for 74HCT390PWHL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT390PWHL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT390PWHL?
74HCT390PWHL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT390PWHL 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 74HCT390PWHL?
For technical support, including 74HCT390PWHL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT390PWHL requirements.
6.How does Aetrix verify that 74HCT390PWHL is sourced from the original manufacturer or authorized distributors?
All 74HCT390PWHL 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 74HCT390PWHL meets industry standards.
7.What is the process for return or replacement of 74HCT390PWHL?
All 74HCT390PWHL units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT390PWHL, 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 74HCT390PWHL part is unused and in its original packaging.
Return procedure for 74HCT390PWHL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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