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Difference between revisions of "7400 series"

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| 14 || Hex Schmitt-trigger inverter
 
| 14 || Hex Schmitt-trigger inverter
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| 15 || Triple 3-Input AND gate; open collector outputs
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| 16 || Hex Inverter/Driver; open collector 15V outputs
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| 17 || Hex Buffer/Driver; open collector 15V outputs
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| 18 || Dual 4-input NAND gate with Schmitt trigger inputs
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| 19 || Hex Schmitt trigger Inverter
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|-
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| 20 || Dual 4-input NAND gate; open collector 15V outputs
 +
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| 21 || Dual 4-input AND gate; open collector 15V outputs
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| 22 || Dual 4-input NAND gate; open collector 15V outputs
 +
|-
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| 23 || Dual 4-input NOR gate with strobe
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| 24 || Quad 2-input NAND gate with Schmitt trigger inputs
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|-
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| 25 || Dual 4-input NOR gate with strobe
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|-
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| 26 || Quad 2-input NAND gate; open collector 15V outputs
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|-
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| 27 || Triple 3-input NOR gate
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| 28 || Quad 2-input NOR gate
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| 29 ||
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| 30 || 8-Input NAND gate
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| 31 || Hex delay elements
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| 32 || Quad 2-input OR gate
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| 33 || Quad 2-input NOR gate; open collector outputs
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| 34 || Hex non-Inverter
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| 35 || Hex non-Inverter; open collector outputs
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| 36 || Quad 2-input NOR gate (Different [[pinout]])
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| 37 || Quad 2-input NAND gate (Different [[pinout]])
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| 38 || Quad 2-input NAND gate; open collector outputs
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| 39 || Quad 2-input NAND gate; open collector outputs (Different [[pinout]])
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| 40 || Dual 4-input NAND Gates
 
|}
 
|}

Revision as of 05:21, 12 November 2015

A series of various 74LS chips.

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. Generally speaking, parts from the same subfamily can be used freely with other parts from the same subfamily. However, in many cases not with parts from other subfamilies. This is because voltage and current configurations for ICs from the same subfamily are designed so they can be connected without requiring additional work.

Part Identification

HD 54 LS   10    
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:
Some of more popular ones you'll encounter are:
None - When no indicator is found, this implies it's the original TTL
Bipolar
S - Schottky logic.
LS - Low-power Schottky. Same as L series but with reduced power consumption and switching speed.
CMOS
C - CMOS
AC / ACT - Advanced CMOS (T version for TTL-compatible inputs)
HC / HCT - High-speed CMOS, similar to LS (T version for TTL-compatible inputs)
AHC / AHCT - Advanced high-speed CMOS (T version for TTL-compatible inputs)
LV / LVC' - Low-Voltage CMOS
BiCMOS
BCT - BiCMOS
ABT - Advanced BiCMOS
  • Gates Count (surface mount ICs only)
1G = 1, 2G = 2, 3G = 3
  • Device Number
00 - NAND
02 - NOR
04 - NOT
08 - AND
10 - 3-input NAND
11 - 3-input AND
20 - 4-input NAND
21 - 4-input AND
25 - 4-input NOR
27 - 3-input NOR
30 - 8-input NAND
32 - 2-input OR
etc.. (full list below)
  • Package Designation
D - DIP
DB - SSOP
FK - LCCC
J - CDIP
N - Plastic DIP
NS - SOP
PS - SOP
T - Flat package
W - CFP

Example

Circuito integrado DM74LS221M.jpg

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
15 Triple 3-Input AND gate; open collector outputs
16 Hex Inverter/Driver; open collector 15V outputs
17 Hex Buffer/Driver; open collector 15V outputs
18 Dual 4-input NAND gate with Schmitt trigger inputs
19 Hex Schmitt trigger Inverter
20 Dual 4-input NAND gate; open collector 15V outputs
21 Dual 4-input AND gate; open collector 15V outputs
22 Dual 4-input NAND gate; open collector 15V outputs
23 Dual 4-input NOR gate with strobe
24 Quad 2-input NAND gate with Schmitt trigger inputs
25 Dual 4-input NOR gate with strobe
26 Quad 2-input NAND gate; open collector 15V outputs
27 Triple 3-input NOR gate
28 Quad 2-input NOR gate
29
30 8-Input NAND gate
31 Hex delay elements
32 Quad 2-input OR gate
33 Quad 2-input NOR gate; open collector outputs
34 Hex non-Inverter
35 Hex non-Inverter; open collector outputs
36 Quad 2-input NOR gate (Different pinout)
37 Quad 2-input NAND gate (Different pinout)
38 Quad 2-input NAND gate; open collector outputs
39 Quad 2-input NAND gate; open collector outputs (Different pinout)
40 Dual 4-input NAND Gates
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