CD74HCT670EE4 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
CD74HCT670EE4 is a 4x4 register file (parallel-in parallel-out) from Texas Instruments in the HCT logic family, offering 4-bit data storage with separate read/write address and enable inputs in a 16-pin DIP package. Compatible with 5 V TTL logic levels. Available in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD74HCT670EE4 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 CD74HCT670EE4?
- 4×4 register file with independent read and write ports enables simultaneous read and write access without a read-modify-write cycle, reducing pipeline stall in microcontroller scratch-pad designs
- HCT logic family provides TTL-compatible input thresholds, allowing direct interfacing with 5 V LSTTL bus logic without level-shifting buffers
- 50 pF specified load capacitance supports standard PCB bus trace lengths at typical CMOS output drive strengths for reliable timing closure
- 16-pin PDIP package allows breadboard and through-hole prototyping for retro computer, FPGA test, and educational logic circuit projects
What is CD74HCT670EE4 used for?
CD74HCT670EE4 is used as a small scratchpad register file in state machines, address latches for segmented memory controllers, and retro microcomputer bus interface designs where 4 words of 4-bit storage must be accessed with independent read and write pointers. Its TTL-compatible HCT inputs make it suitable for bridging 5 V TTL bus logic with CMOS control lines in mixed-logic legacy industrial boards. The DIP-16 package also suits educational circuit labs and hobby single-board computer projects that prototype on solderless breadboards.
What are the specifications of CD74HCT670EE4?
| Pbfree Code | Yes |
| YTEOL | 0 |
| Count Direction | RIGHT |
| Family | HCT |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | PARALLEL IN PARALLEL OUT |
| Number of Bits | 4 |
| Number of Functions | 1 |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 50mA |
| Propagation Delay (tpd) | 63ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Where can I find the CD74HCT670EE4 datasheet?
CD74HCT670EE4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD74HCT670EE4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What does the 4×4 register file architecture of CD74HCT670EE4 mean for concurrent read and write access?
The 4×4 architecture provides 4 words of 4-bit storage with separate write-address (WA), read-address (RA), write-enable (WE), and read-enable (RE) inputs. This allows a write operation at one address to occur simultaneously with a read from a different address in the same clock cycle, eliminating the read-modify-write penalty found in simple latches and enabling throughput of up to 1 operation per clock edge.
How does the HCT logic family in CD74HCT670EE4 differ from standard HC CMOS, and why does it matter for TTL bus interfacing?
HCT devices have TTL-compatible input thresholds (VIL max = 0.8 V, VIH min = 2.0 V) versus HC devices (VIH min = 3.5 V at 5 V supply). This means CD74HCT670EE4 will reliably accept logic HIGH from a 74LS TTL output that only drives to 2.4 V, whereas a standard HC part would interpret that level as undefined. No pull-up or level-shift resistor is needed, saving 1 to 4 passive components per bus signal.
What load capacitance is specified for CD74HCT670EE4 outputs, and what PCB trace length does that limit?
CD74HCT670EE4 output timing parameters are characterized at 50 pF load capacitance. At a typical FR4 trace capacitance of approximately 1 pF/mm (including connector and via parasitics), a 50 pF budget allows roughly 40 mm to 50 mm of PCB trace per output without needing bus buffer ICs or impedance termination, which is sufficient for compact single-board computer data bus lengths.
In which scenario would CD74HCT670EE4 be a practical alternative to using an SRAM chip for 4-nibble scratchpad storage?
For a state machine needing only 4 words of 4-bit temporary storage, a dedicated 4×4 register file like CD74HCT670EE4 offers simultaneous read/write access with propagation delays under 20 ns and a supply current under 80 µA at 5 V — avoiding the 5 V SRAM's higher minimum address setup time, chip-select latency, and need for a separate address decoder. It reduces the sub-system to 1 IC instead of an SRAM plus decoder, cutting power and board space.
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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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