74LS293 Decade and 4-bit Binary Counter
Package SOIC Series 74LS
74LS293 overview
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.
Key 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
Datasheet
290.pdf
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 pinout
| 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 |
74LS293 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
More about 74LS293
74LS293 Alternative Equivalent
74LS190, 74LS191
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