74LS293 Decade and 4-bit Binary Counter
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. 74LS293 monolithic counters contain four master-slave flip-flops and additional gating to provide a divide-by-two counter and a three-stage binary counter.
74LS293 Features
- Identical in Function to the 74LS93 with Different Pin Arrangement
- Contains Four Master-Slave Flips-Flops together with a Binary Counter
- Gated Zero Reset
- Fast Propagation Speeds
- Low Power Dissipation
74LS293 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 |
74LS293 Pinout Diagram
74LS293 Pin Description
| Pin No | Pin Name | Description |
| 1 | NC | Not Connected |
| 2 | NC | Not Connected |
| 3 | NC | Not Connected |
| 4 | Q2 | Output Bit 2 Of Counter |
| 5 | Q1 | Output Bit 1 Of Counter |
| 6 | NC | Not Connected |
| 7 | GND | Ground |
| 8 | Q3 | Output Bit 3 Of Counter |
| 9 | Q0 | Output Bit 4 Of Counter |
| 10 | CP0′ | Clock Pulse(Active Low) |
| 11 | CP1′ | Clock Pulse(Active Low) |
| 12 | MR | Asynchronous Master Reset Pin |
| 13 | MR | Asynchronous Master Reset Pin |
| 14 | VCC | Positive Supply |
Applications
- Frequency counters
- Digital clocks
- Analog to digital converters
- With some changes in their design, counters can be used as frequency divider circuits
- In time measurement
74LS293 Alternative Equivalent
74LS190, 74LS191
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