74LS248-BCD TO 7-Segment Decoder/Driver
Series 74LS
74LS248 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.The 74LS248 is a BCD-to-Seven-Segment Decoder/Drivers. The 74LS248 composes 6 and 9 with the tails and active for low outputs for direct drive of indicators.
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
sn7447a.pdf
74LS248 features
- Internal Pull-Ups Eliminate Need for External Resistors
- Lamp-Test Provision
- Leading /Trailing Zero Suppression
74LS248 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | B | Input Pin |
| 2 | C | Input Pin |
| 3 | LT' | Lamp test Pin |
| 4 | RBO' | Ripple Blanking Output (Active Low) |
| 5 | RBI' | Ripple Blanking Input (Active Low) |
| 6 | D | Input Pin |
| 7 | A | Input Pin |
| 8 | GND | Ground |
| 9 | e | Output |
| 10 | d | Output |
| 11 | c | Output |
| 12 | b | Output |
| 13 | a | Output |
| 14 | g | Output |
| 15 | f | Output |
| 16 | VCC | Positive Supply |
74LS248 applications
- Decoders are used to input data to a specified output line as is done in addressing core memory where input data is to be stored in a specified memory location.
- It is used in code conversions.
- In high-performance memory systems, this decoder can be used to minimize the effects of system decoding.
More about 74LS248
74LS248 Alternative Equivalent
74LS247
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