CD74AC299M96G4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD74AC299M96G4 is an 8-bit universal shift/storage register from Texas Instruments in the AC logic family, supporting parallel load, bidirectional shift, and hold modes at up to 68 MHz. It features common I/O pins and totem-pole serial outputs in a 20-pin SOIC package.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- OBSOLETE
- Datasheet
- CD74AC299M96G4 Datasheet PDF
- Category
- Integrated Circuit
- 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 CD74AC299M96G4?
- 8-bit universal shift register with parallel-in parallel-out, shift-left, shift-right, and hold modes at up to 68 MHz for versatile high-speed data serialization and deserialization
- Common bidirectional I/O pins reduce pin count and simplify bus-interface routing compared to separate input and output port designs on 8-bit data paths
- AC-family CMOS logic with 50 pF load capacitance rating in a 20-pin SOIC package, ensuring compatibility with 5 V TTL and CMOS systems while driving moderate bus loads
What is CD74AC299M96G4 used for?
The CD74AC299M96G4 is used in microprocessor and DSP systems for 8-bit data bus expansion, where its parallel-load and serial-shift modes enable simultaneous capture and serial streaming of bus data at 68 MHz clock rates. It serves in FPGA prototyping boards and embedded controller designs requiring bidirectional shift registers for SPI-to-parallel interface bridging. Its hold mode is also valuable in industrial data acquisition systems where input data must be latched and held stable while a downstream processor reads the register contents.
What are the specifications of CD74AC299M96G4?
| YTEOL | 0 |
| Additional Feature | HOLD MODE; COMMON I/O PINS; TOTEMPOLE SERIAL SHIFT RIGHT & SHIFT LEFT OUTPUTS; GATED OUTPUT CONTROL |
| Count Direction | BIDIRECTIONAL |
| Family | AC |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | PARALLEL IN PARALLEL OUT |
| Max Frequency@Nom-Sup | 68000000Hz |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 100mA |
| Propagation Delay (tpd) | 169ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 1.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| 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 | POSITIVE EDGE |
| fmax-Min | 95MHz |
| 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 |
Where can I find the CD74AC299M96G4 datasheet?
CD74AC299M96G4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74AC299M96G4?
Compatible alternatives and drop-in replacements for CD74AC299M96G4:
Parallel In Parallel Out, AC Series, 8-Bit, Bidirectional, True Output, CMOS, PDSO20
Frequently Asked Questions
What is the maximum operating frequency of CD74AC299M96G4 and what clock speed can the host system use?
The CD74AC299M96G4 operates at a maximum frequency of 68 MHz with a 50 pF load, allowing host systems to clock the shift register at up to 68 MHz and still meet setup and hold timing, which is adequate for most 8-bit serial-to-parallel conversion tasks in embedded and DSP designs.
How do the common bidirectional I/O pins of CD74AC299M96G4 benefit a bus-expansion circuit?
Because the 8 data pins serve as both inputs during parallel load and outputs during shift or read operations, the CD74AC299M96G4 can connect directly to a shared 8-bit data bus using only one set of traces, saving up to 8 PCB net connections and simplifying signal routing compared to separate input/output-port shift registers.
Which operating modes does CD74AC299M96G4 support and how do they differ in a data-logging application?
CD74AC299M96G4 supports parallel load (capture 8 bits simultaneously), shift-right, shift-left (serial streaming in either direction), and hold (freeze register contents) modes. In a data logger, parallel load captures a sensor byte atomically, hold preserves it while the MCU reads it over SPI, and shift-right then serializes the byte to a UART—all within one 8-bit register.
Can CD74AC299M96G4 drive standard 5 V TTL inputs directly from a 5 V CMOS supply?
Yes, in the AC family at 5 V supply the CD74AC299M96G4 outputs VOH typically above 4.9 V and VOL below 0.1 V, which are fully compatible with 5 V TTL input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), and it can drive up to 50 pF loads, covering most PCB trace capacitances at moderate clock speeds.
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Why Buy from FindMyChip
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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