SNJ54ALS191AJ Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
SNJ54ALS191AJ is a presettable synchronous 4-bit binary up/down counter by Texas Instruments in the ALS logic family, featuring look-ahead carry for high-speed cascading, housed in a 16-pin ceramic DIP package. Key specs: bidirectional count, synchronous preset, TCO output, military temperature range. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- SNJ54ALS191AJ Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $14.3600(MOQ 500)
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of SNJ54ALS191AJ?
- Presettable 4-bit synchronous binary up/down counter with parallel load capability
- Look-ahead carry circuitry (TCO output) enables high-speed cascading of multiple counters
- Bidirectional counting with a single direction control input for up or down operation
- Military-grade 16-pin ceramic DIP package rated for -55°C to +125°C temperature range
- ALS bipolar logic family offering faster speed than LS with lower power than TTL
What is SNJ54ALS191AJ used for?
The SNJ54ALS191AJ is used in military and aerospace digital systems for frequency division, event counting, address generation, and timing circuit design. Its look-ahead carry output allows multiple devices to be cascaded without delay penalty, making it ideal for building wide counting registers in radar signal processing, avionics instrumentation, and ruggedized industrial automation.
What are the specifications of SNJ54ALS191AJ?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | TCO OUTPUT |
| Count Direction | BIDIRECTIONAL |
| Family | ALS |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY 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 | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 22mA |
| Prop. Delay@Nom-Sup | 31ns |
| Propagation Delay (tpd) | 26ns |
| Qualification Status | Not Qualified |
| Screening Level | MIL-PRF-38535 |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | TTL |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 20MHz |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the SNJ54ALS191AJ datasheet?
SNJ54ALS191AJ Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for SNJ54ALS191AJ?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What makes the SNJ54ALS191AJ suitable for cascading multiple counters?
The SNJ54ALS191AJ features a Terminal Count Output (TCO) that implements look-ahead carry logic, allowing multiple counter ICs to be cascaded without the cumulative propagation delays typical of ripple-carry designs. This enables fast multi-stage counting systems where all stages update nearly simultaneously, critical for high-speed digital applications.
Does the SNJ54ALS191AJ support both up and down counting?
Yes, the SNJ54ALS191AJ is a bidirectional counter with a dedicated direction control input (D/U pin). When D/U is high the counter counts down; when low it counts up. The synchronous preset (Load) input allows parallel loading of any 4-bit value from the data inputs on the next clock edge, enabling flexible initialization of the count sequence.
What temperature range does the SNJ54ALS191AJ support?
The SNJ54ALS191AJ is part of Texas Instruments' SNJ54 military-grade series and is rated for operation from -55°C to +125°C in its ceramic dual in-line package (CDIP, JESD-30 code R-GDIP-T16). This wide temperature range and ceramic packaging make it suitable for defense, aerospace, and high-reliability industrial applications.
Is the SNJ54ALS191AJ RoHS compliant?
Yes, the SNJ54ALS191AJ carries a Pbfree Code of Yes, indicating lead-free construction and RoHS compliance. The device is manufactured with a JESD-609 code of e0, and the part is available in active production from Texas Instruments, supporting long-term supply for military and high-reliability programs.
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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.
More from Texas Instruments
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| 500+ | $16.1600 | $8080.00 |
| 1000+ | $15.2600 | $15260.00 |
| 10000+ | $14.3600 | $143600.00 |
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