SN74LS190N Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The SN74LS190N is a synchronous up/down decade counter IC from Texas Instruments in a 16-pin PDIP package. It operates at clock frequencies up to 20 MHz, supports load and preset inputs, and includes a terminal count output for cascading. Suitable for digital clocks, frequency dividers, and industrial counting applications requiring bidirectional BCD counting.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- SN74LS190N Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.6250(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Synchronous bidirectional decade (BCD) counting up to 20 MHz clock frequency
- Parallel load and preset inputs for flexible initialization
- Terminal count output (TCO) enables easy multi-stage cascading
- LS-family TTL logic for 5 V operation with 15 pF load capacitance
- Single-supply 5 V operation compatible with standard TTL and LSTTL logic
- 16-pin PDIP package simplifies breadboard prototyping and through-hole assembly
Applications
The SN74LS190N is widely used in digital counters, frequency dividers, and BCD-driven display systems such as seven-segment displays in industrial instruments and clocks. Its synchronous clocking and bidirectional counting support both up-counting and down-counting sequences in control panel displays and event counters. The cascadable terminal count output allows designers to chain multiple SN74LS190N devices to build multi-decade counters for test equipment and programmable controllers.
Specifications
| Pbfree Code | No |
| YTEOL | 0 |
| Additional Feature | TCO OUTPUT |
| Count Direction | BIDIRECTIONAL |
| Family | LS |
| JESD-30 Code | R-PDIP-T16 |
| Load Capacitance (CL) | 15pF |
| Load/Preset Input | YES |
| Logic IC Type | DECADE COUNTER |
| Max Frequency@Nom-Sup | 20000000Hz |
| Max I(ol) | 0.008A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Power Supply Current-Max (ICC) | 35mA |
| Prop. Delay@Nom-Sup | 36ns |
| Propagation Delay (tpd) | 36ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.25V |
| Supply Voltage-Min (Vsup) | 4.75V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 20MHz |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the maximum clock frequency supported by SN74LS190N in a cascaded decade counter design?
The SN74LS190N supports a maximum clock frequency of 20 MHz at nominal 5 V supply. In cascaded configurations, the terminal count output (TCO) of one stage drives the clock enable of the next, slightly reducing effective throughput per stage. Designers should account for propagation delays when chaining 2 or more SN74LS190N devices to ensure proper synchronous counting at high speeds.
How does the parallel load feature of SN74LS190N benefit programmable countdown timer designs?
The SN74LS190N includes parallel load and preset inputs that allow a 4-bit BCD value to be synchronously loaded in a single clock cycle. This means a programmable countdown timer can reload a starting count from external DIP switches or a latch without halting the system clock. Combined with bidirectional counting, this eliminates the need for external reset logic in applications requiring configurable timeout intervals.
Which logic family alternatives exist for SN74LS190N if lower power consumption is required in a battery-powered counter?
For lower power consumption, the CMOS equivalent 74HC190 or 74HCT190 can replace SN74LS190N while maintaining the same 16-pin PDIP pinout and BCD counting function. The 74HC190 operates from 2 V to 6 V and draws significantly less quiescent current than the LS-TTL 5 V-only SN74LS190N, extending battery life in portable event counters. Verify timing parameters such as maximum frequency and setup time when substituting, as CMOS propagation delays differ from LS-TTL.
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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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.2500 | $1.25 |
| 21+ | $0.7500 | $15.75 |
| 81+ | $0.6250 | $50.63 |
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