The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS253 Schottky-clamped data selectors/multiplexers contain inverters and drivers to supply fully complementary, on-chip, binary decoding data selection to the AND-OR gates
74LS253 Features
- Tri-State Version of the 74LS153
- Schottky Diode Clamped Transistors
- Permit Multiplexing from N-lines to One Line
- Performs Parallel to Serial Conversion
- Standard TTL Switching Voltages
74LS253 Specifications
| Supply Voltage | 4.75 – 5.25Vdc |
| Maximum Clock Frequency | 40Mhz |
| Power Dissipation | 2mW/gate @100kHz |
| Minimum Output Current | 8mA |
| Propagation Delay | 10nS |
| Fan Out (TTL Loads) | 20 |
74LS253 Pinout Diagram
74LS253 Pin Description
| Pin No | Pin Name | Description |
| 1 | E0a | Enable Output a |
| 2 | S1 | Select Pin |
| 3 | I3a | Data Input Of Multiplexer (a) |
| 4 | I2a | Data Input Of Multiplexer (a) |
| 5 | I1a | Data Input Of Multiplexer (a) |
| 6 | I0a | Data Input Of Multiplexer (a) |
| 7 | Za | Output Of Multiplexer (a) |
| 8 | GND | Ground |
| 9 | Zb | Output Of Multiplexer (b) |
| 10 | I0b | Data Input Of Multiplexer (b) |
| 11 | I1b | Data Input Of Multiplexer (b) |
| 12 | I2b | Data Input Of Multiplexer (b) |
| 13 | I3b | Data Input Of Multiplexer (b) |
| 14 | S0 | Select Pin |
| 15 | E’0b | Enable Output b |
| 16 | VCC | Positive Supply |
Applications
- Multiple data can be transmitted using a single line.
74LS253 Alternative Equivalent
74LS251, 74LS257
Download 74LS253 Dual 4 to 1 Multiplexer Tri-State Datasheet from the link given below.
