CD74HCT670E - Electronic component TEXAS INSTRUMENTS - Free user manual and instructions
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| Product Type | Integrated Circuit (IC) |
| Series | CD74HCT670E |
| Logic Family | HCT (High-Speed CMOS, TTL-Compatible) |
| Memory Configuration | 4 words x 4 bits (16 bits total) |
| Package Type | PDIP-16 (Plastic Dual In-line Package) |
| Number of Pins | 16 |
| Dimensions (approx.) | 19.3 mm x 6.35 mm x 3.3 mm |
| Weight (approx.) | 0.5 g |
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
| Input Voltage Range | 0 V to VCC |
| Output Type | 3-State (Tri-State) |
| Output Current | ±4 mA (typical) |
| Propagation Delay | 34 ns (typical at 5 V, 50 pF load) |
| Operating Temperature Range | -55°C to +125°C |
| Function | 4-bit register file with independent write and read addressing |
| Write Enable | Active low (WE) |
| Output Enable | Active low (OE) |
| ESD Protection | 2 kV (human body model, typical) |
| Mounting Type | Through-Hole (THT) |
| Maintenance | No mechanical parts; keep dry and static-free |
| Cleaning | Use isopropyl alcohol to remove flux; avoid harsh solvents |
| Safety Precautions | ESD sensitive; handle with grounded equipment and anti-static measures |
| Spare Parts | Not applicable; soldered component, replace only at board level |
Frequently Asked Questions - CD74HCT670E TEXAS INSTRUMENTS
What is the CD74HCT670E?
The CD74HCT670E is a high-speed CMOS integrated circuit that functions as a 4-bit x 4-word register file. It contains four independent 4-bit registers and allows simultaneous write and read operations through separate address ports.
What is the supply voltage range for the CD74HCT670E?
The recommended operating supply voltage (VCC) is 4.5 V to 5.5 V, making it compatible with standard TTL and 5V microcontroller systems. Absolute maximum ratings extend up to 7V, but normal operation should stay within the recommended range.
How does the addressing work on this register file?
The device has two 2-bit address ports: write addresses (A0, A1) select which of the four words is written, and read addresses (B0, B1) select which word is output. This allows independent read and write operations, ideal for temporary data storage.
Can the outputs be tri-stated?
Yes, the outputs are 3-state. When the Output Enable (OE) input is high, the output pins (Q0–Q3) go into a high-impedance state. When OE is low, the selected register word appears at the outputs.
Is the CD74HCT670E TTL-compatible?
Yes, the HCT family is specifically designed to be TTL-compatible. Input logic levels follow TTL standards (VIH ≈ 2.0V, VIL ≈ 0.8V), while outputs provide CMOS-like drive, making it easy to interface with both TTL and CMOS devices.
What is the difference between the HC and HCT versions?
The HC version uses CMOS-level input thresholds (VIH ≈ 70% VCC, VIL ≈ 30% VCC), while the HCT version uses TTL-level thresholds (VIH = 2.0V, VIL = 0.8V). The HCT is ideal for replacing TTL logic or interfacing with 5V systems that expect TTL signal levels.
How do I connect the CD74HCT670E to a microcontroller?
Connect D0–D3 to the microcontroller data bus, Q0–Q3 to the input pins (if reading), and control lines WE, OE, and address inputs to GPIO pins. Ensure the output load does not exceed ±4 mA and add pull-up resistors if the microcontroller pins are open-drain.
What are typical applications for the CD74HCT670E?
Typical applications include data storage registers, CPU register files, buffer storage for peripheral interfaces, address decoding, and implementing look-up tables in digital systems.
What ESD precautions should I take when handling this component?
The device is ESD sensitive (rated 2kV HBM). Handle it using a grounded workbench, wear anti-static wrist straps, and store the IC in anti-static foam or packaging until soldering. Avoid touching the pins directly.
What is the pinout of the PDIP-16 package?
Pinout: 1=A1, 2=A0, 3=D3, 4=D2, 5=D1, 6=D0, 7=WE, 8=GND, 9=OE, 10=Q0, 11=Q1, 12=Q2, 13=Q3, 14=B0, 15=B1, 16=VCC. Refer to the datasheet for detailed timing diagrams and AC characteristics.
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Brand : TEXAS INSTRUMENTS
Model : CD74HCT670E
Category : Electronic component