Semiconductor & Computer Engineering
From WikiChip
7400 series
7400 series is an extended family of digital integrated circuits. Chips in this series include a variety of discrete logic chips chips such as and gates and or gates as well as registers, decoders, and RAM units. While the original series was designed as TTL logic chips, over the years, a large number of sub-families have been introduced.
Part Identification
| SN | 74 | HCT | 2G | 04 | N | |
| Package Designation | ||||||
| Device Number | ||||||
| Gates Count | ||||||
| Technology Indicator | ||||||
| Specs/Temp Indicator | ||||||
| Manufacturer Prefix | ||||||
- Specs/Temp Indicator:
- 75 - Interface device
- 74 - Commercial Grade
- 64 - Industrial
- 54 - Military/Airspace Grade
- Technology indicator:
- HCT - High-speed CMOS, with TTL-compatible inputs
- Gates Count (surface mount ICs only)
- 1G = 1, 2G = 2, 3G = 3
- Device Number
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- Package Designation
|
|
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Example
Chip is labeled DM74LS221N:
- DM - prefix - made by Fairchild or National Semiconductor, but given the F logo, we can determine it's Fairchild.
- 74 - series - commercial grade chip
- LS - techno - Low-power Schottky.
- 221 - device - Dual non-retriggerable monostable multivibrator with reset
- N - package - standard plastic DIP
List of Devices
| Device Number | Description |
|---|---|
| 00 | Quad 2-input NAND gate |
| 01 | Quad 2-input NAND gate; open collector outputs |
| 02 | Quad 2-input NOR gate |
| 03 | Quad 2-input NAND gate; open collector outputs |
| 04 | Hex inverter |
| 05 | Hex inverter; open collector outputs |
| 06 | Hex inverter; open collector high voltage outputs |
| 07 | Hex buffer; open collector high voltage outputs |
| 08 | Quad 2-input AND gate |
| 09 | Quad 2-input AND gate; open collector outputs |
| 10 | Triple 3-input NAND gate |
| 11 | Triple 3-input AND Gate |
| 12 | Triple 3-input NAND gate; open collector outputs |
| 13 | Dual 4-input NAND Schmitt triggers |
| 14 | Hex Schmitt-trigger inverter |