SN74LS393DG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments SN74LS393DG4 contains two independent 4-bit binary ripple counters in the LS TTL logic family. Each counter supports divide-by-2 and divide-by-5 functions with a maximum counting frequency of 25 MHz. Housed in a 14-pin SOIC package, it suits frequency division and timing generation circuits in digital systems.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS393DG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual independent 4-bit binary ripple counters with separate clock and clear inputs enabling cascaded frequency division up to 25 MHz
- Integrated divide-by-2 and divide-by-5 functions simplify clock prescaling without external logic gating in timing generator designs
- LS TTL family with 15 pF load drive in a 14-pin SOIC-14 package for compact digital counter implementations
Applications
The SN74LS393DG4 is commonly used in clock frequency prescalers, event counters, and timer circuits in digital electronics boards. Its dual 4-bit counter structure allows cascading to create 8-bit or longer counter chains for pulse counting and frequency division applications up to 25 MHz. The device finds use in legacy logic designs, educational boards, and industrial timer circuits where LS TTL compatibility is required.
Specifications
| YTEOL | 0 |
| Additional Feature | DIVIDE BY 2 AND DIVIDE BY 5 FUNCTIONS |
| Count Direction | UP |
| Family | LS |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 15pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 25000000Hz |
| Max I(ol) | 0.008A |
| Mode of Operation | ASYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 26mA |
| Prop. Delay@Nom-Sup | 60ns |
| Propagation Delay (tpd) | 60ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trigger Type | NEGATIVE EDGE |
| fmax-Min | 35MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74LS393DG4:
Counter, LS Series, Asynchronous, Negative Edge Triggered, 4-Bit, Up Direction, TTL, PDSO14
Frequently Asked Questions
What is the maximum counting frequency of the SN74LS393DG4 and what limits it?
The SN74LS393DG4 supports a maximum count frequency of 25 MHz at nominal supply voltage. This limit is set by the propagation delay of the ripple counter stages; as each bit depends on the previous flip-flop settling, the accumulated delay restricts reliable operation to 25 MHz for the full 4-bit count chain.
How can two SN74LS393DG4 counters be cascaded to build an 8-bit frequency divider?
By connecting the Q3 (MSB) output of the first 4-bit counter to the clock input of the second counter within the same SN74LS393DG4 package, the two sections form an 8-bit ripple divider. This provides division ratios from 2 to 256, enabling sub-25 MHz clock prescaling for microcontroller timing circuits and UART baud-rate generators without additional ICs.
In which legacy digital designs is the SN74LS393DG4 still preferred over modern CMOS counters?
The SN74LS393DG4 in the LS TTL family is preferred in legacy 5V TTL-compatible systems where output drive currents must directly interface with other LS-series gates, such as older industrial PLCs and instrumentation boards. Its 15 pF load rating and 25 MHz speed match established design margins in these systems, avoiding the re-validation required when substituting newer CMOS devices.
Does the SN74LS393DG4 support synchronous clear or only asynchronous reset of the counter?
The SN74LS393DG4 provides an asynchronous active-HIGH master reset (CLR) input that immediately clears all 4 counter bits to zero regardless of clock state. There is no synchronous load or preset function. This asynchronous operation allows instantaneous counter initialization in frequency measurement circuits but requires careful timing design to avoid glitches at 25 MHz clock rates.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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