74LS147N: 马来西亚的首选 Utsource Holding Company Limited

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Below is the parameter table and instructions for the 74LS147N Priority Encoder.

74LS147N Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	V_CC	4.75	5.0	5.25	V
Input Low Voltage	V_IL	0.8	-	-	V
Input High Voltage	V_IH	-	-	2.0	V
Output Low Voltage	V_OL	0.4	-	-	V
Output High Voltage	V_OH	-	-	2.4	V
Input Current (Low)	I_IL	-1.6	-	-	mA
Input Current (High)	I_IH	-	-	40	μA
Output Current (Low)	I_OL	-	-	-8	mA
Output Current (High)	I_OH	-	-	-0.4	mA
Propagation Delay Time	t_pd	22	33	45	ns
Power Dissipation	P_tot	-	-	100	mW
Operating Temperature Range	T_A	0	-	70	°C
Storage Temperature Range	T_STG	-65	-	150	°C

Instructions for Using the 74LS147N

Power Supply:
- Connect the V_CC pin to a 5V supply.
- Connect the GND pin to ground.
Input Connections:
- The 74LS147N has 10 input pins (I0 to I9). These inputs are active low, meaning a low signal (0V) on any input will trigger the encoder.
- If an input is not used, it should be tied to V_CC (5V) to avoid floating states.
Output Connections:
- The 74LS147N has 4 output pins (Q0 to Q3) that provide a binary code corresponding to the highest active low input.
- The outputs are active low, so a low signal indicates a logic 1 in the binary code.
Enable Pin:
- The 74LS147N has an enable pin (EN). When EN is high (5V), the encoder is disabled, and all outputs are high (logic 0).
- When EN is low (0V), the encoder is enabled, and it will encode the highest active low input.
Propagation Delay:
- The propagation delay time (t_pd) is the time it takes for the output to change after an input changes. It typically ranges from 22 to 45 nanoseconds.
Operating Conditions:
- Ensure that the operating temperature range (0°C to 70°C) is maintained to avoid damage to the device.
- Store the device within the storage temperature range (-65°C to 150°C) when not in use.
Example Application:
- To encode a decimal number (0-9) into a 4-bit binary code:
  - Connect the decimal inputs (I0 to I9) to the corresponding switches or sensors.
  - Connect the enable pin (EN) to ground to enable the encoder.
  - The binary output (Q0 to Q3) will represent the highest active low input in binary form.

By following these instructions, you can effectively use the 74LS147N Priority Encoder in your digital circuits.

(For reference only)