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74xxx Logic Family

74xxx series

Table of Contents

1 - 7400 Quad NAND

Quad 2-input positive NAND gate

2 - 7401 Quad NAND

Quad 2-input positive NAnd gate with open collector output

These devices contain 4 independent 2-input NAND gates. The open-collector outputs require pull-up resistors to perform correctly. They may be connected to other open-collector outputs to implement active-low wired-OR or active-high wired-AND functions. Open-collector devices are often used to generate higher VOH levels.

The TI SN5401 & SN54LS01 operate over the full military temperature range of -55°C to 125°C. The SN7401 & SN74LS01 operate over 0°C to 70°C.

Function table (each gate)
Inputs Output
An Bn Yn
HHL
LHH
HLH
LLH
Absolute max ratings over operating free-air temperature range
Supply Voltage VCC '01 & 'LS01 7V
Input voltage '01 5.5V
'LS01 7V
Off-state output voltage 7V
Operating free-air temperature range SN54' -55°C to 125°C
SN74' 0°C to 70°C

3 - 7404 Hex Inverter

Hex Inverter

These devices contain 6 hex inverters.

The TI SN5404 & SN54LS04 operate over the full military temperature range of -55°C to 125°C. The SN7404 & SN74LS04 operate over 0°C to 70°C.

Function table (each gate)
Input Output
An Yn
HL
LH

4 - 7405 Hex Inverter with Open Collector outputs

Hex Inverter with Open Collector outputs

These devices contain 6 hex inverters.

The TI SN5405 & SN54LS05 operate over the full military temperature range of -55°C to 125°C. The SN7405 & SN74LS05 operate over 0°C to 70°C.

Function table (each gate)
Input Output
An Yn
HL
LH

5 - 7406 Hex Inverter with Open Collector High-Voltage outputs

Hex Inverter with Open Collector High-Voltage outputs

These devices contain 6 hex inverters with High-Voltage Open Collectors. The outputs are rated at 30V.

The TI SN5405 & SN54LS05 operate over the full military temperature range of -55°C to 125°C. The SN7405 & SN74LS05 operate over 0°C to 70°C.

Function table (each gate)
Input Output
An Yn
H L
L H

6 - 74160 Synchronous 4-Bit counter with direct clear

Synchronous 4-Bit counter with direct clear

7 - 74161 Synchronous 4-Bit counter with direct clear

Synchronous 4-Bit counter with direct clear

8 - 74162 Fully Synchronous 4-Bit counter

Fully Synchronous 4-Bit counter

9 - 74163 Fully Synchronous 4-Bit counter

Fully Synchronous 4-Bit counter

10 - 74240 Octal Buffers and Line Drivers With 3-State Outputs

Octal Buffers and Line Drivers With 3-State Outputs

The 74240 provides Octal Buffers and Line Drivers With 3-State Outputs.

They are organized as two 4-bit buffers and drivers with separate output-enable (G) inputs. When G is low, the device passes data from the A inputs to the Y outputs. When G is high, the outputs are in the high impedance state. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in a mixed 3.3-V and 5-V system environment. To ensure the high-impedance state during power up or power down, G must be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Function table
Inputs Output
G An Yn
L L H
L H L
H L Z
H H Z
Pin I/O Description
No Name
1 1G I Channel 1 output enable
2 1A1 I Channel 1 A side 1
3 2Y4 O Channel 2 Y side 4
4 1A2 I Channel 1 A side 2
5 2Y3 O Channel 2 Y side 3
6 1A3 I Channel 1 A side 3
7 2Y2 O Channel 2 Y side 2
8 1A4 I Channel 1 A side 4
9 2Y1 O Channel 2 Y side 1
10 GND Ground
11 2A1 I Channel 2 A side 1
12 1Y4 O Channel 1 Y side 4
13 2A2 I Channel 2 A side 2
14 1Y3 O Channel 1 Y side 3
15 2A3 I Channel 2 A side 3
16 1Y2 O Channel 1 Y side 2
17 2A4 I Channel 2 A side 4
18 1Y1 O Channel 1 Y side 1
19 2G I Channel 2 Output Enable
20 VCC Power supply

11 - 74241 Octal Buffers and Line Drivers With 3-State Outputs

Octal Buffers and Line Drivers With 3-State Outputs

The 74241 provides Octal Buffers and Line Drivers With 3-State Outputs.

They are organized as two 4-bit buffers and drivers with separate output-enable (G) inputs. When G is low, the device passes data from the A inputs to the Y outputs. When G is high, the outputs are in the high impedance state. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in a mixed 3.3-V and 5-V system environment. To ensure the high-impedance state during power up or power down, G must be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Function table Channel 1
Inputs Output
G An Yn
L L L
L H H
H L Z
H H Z
Function table Channel 2
Inputs Output
G An Yn
H L H
H H H
L L Z
L H Z
Pin I/O Description
No Name
1 1G I Channel 1 output enable
2 1A1 I Channel 1 A side 1
3 2Y4 O Channel 2 Y side 4
4 1A2 I Channel 1 A side 2
5 2Y3 O Channel 2 Y side 3
6 1A3 I Channel 1 A side 3
7 2Y2 O Channel 2 Y side 2
8 1A4 I Channel 1 A side 4
9 2Y1 O Channel 2 Y side 1
10 GND Ground
11 2A1 I Channel 2 A side 1
12 1Y4 O Channel 1 Y side 4
13 2A2 I Channel 2 A side 2
14 1Y3 O Channel 1 Y side 3
15 2A3 I Channel 2 A side 3
16 1Y2 O Channel 1 Y side 2
17 2A4 I Channel 2 A side 4
18 1Y1 O Channel 1 Y side 1
19 2G I Channel 2 Output Enable
20 VCC Power supply

12 - 74244 Octal Buffers and Line Drivers With 3-State Outputs

Octal Buffers and Line Drivers With 3-State Outputs

The 74244 provide Octal Buffers and Line Drivers With 3-State Outputs.

They are organized as two 4-bit buffers and drivers with separate output-enable (G) inputs. When G is low, the device passes data from the A inputs to the Y outputs. When G is high, the outputs are in the high impedance state. Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of this device as a translator in a mixed 3.3-V and 5-V system environment. To ensure the high-impedance state during power up or power down, G must be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Function table
Inputs Output
G An Yn
L L L
L H H
H L Z
H H Z
Pin I/O Description
No Name
1 1G I Channel 1 output enable
2 1A1 I Channel 1 A side 1
3 2Y4 O Channel 2 Y side 4
4 1A2 I Channel 1 A side 2
5 2Y3 O Channel 2 Y side 3
6 1A3 I Channel 1 A side 3
7 2Y2 O Channel 2 Y side 2
8 1A4 I Channel 1 A side 4
9 2Y1 O Channel 2 Y side 1
10 GND Ground
11 2A1 I Channel 2 A side 1
12 1Y4 O Channel 1 Y side 4
13 2A2 I Channel 2 A side 2
14 1Y3 O Channel 1 Y side 3
15 2A3 I Channel 2 A side 3
16 1Y2 O Channel 1 Y side 2
17 2A4 I Channel 2 A side 4
18 1Y1 O Channel 1 Y side 1
19 2G I Channel 2 Output Enable
20 VCC Power supply

13 - 74245 Octal Bus Transceivers With 3-State Outputs

Octal Bus Transceivers With 3-State Outputs
Pin I/O Description
No Name
1 DIR I Control signal direction; High = Bx to Ax Low = Ax to Bx
2 A1 I/O Channel 1 A side
3 A2 I/O Channel 2 A side
4 A3 I/O Channel 3 A side
5 A4 I/O Channel 4 A side
6 A5 I/O Channel 5 A side
7 A6 I/O Channel 6 A side
8 A7 I/O Channel 7 A side
9 A8 I/O Channel 8 A side
10 GND Ground
11 B8 I/O Channel 8 B side
12 B7 I/O Channel 7 B side
13 B6 I/O Channel 6 B side
14 B5 I/O Channel 5 B side
15 B4 I/O Channel 4 B side
16 B3 I/O Channel 3 B side
17 B2 I/O Channel 2 B side
18 B1 I/O Channel 1 B side
19 OE I Active low output enable;
Low = all channels active,
High = all channels disabled, high impedance
20 VCC Power supply