Details

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BUY SN74LS148N. https://www.utsource.net/itm/p/12607398.html

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	VCC	4.75	5	5.25	V	VIH = 2VCC/3, VIL = VCC/3
Input High Voltage	VIH	-	2.0	-	V	VCC = 5V
Input Low Voltage	VIL	-	0.8	-	V	VCC = 5V
Output High Voltage (Open)	VOH	-	-	VCC - 0.25	V	IO = -0.4mA, VCC = 5V
Output Low Voltage	VOL	0.25	-	0.4	V	IO = 16mA, VCC = 5V
Input Leakage Current	IIL	-0.4	-	20	渭A	VCC = 5V, VI = 0V
Output Leakage Current	IOL	-	-	0.4	mA	VCC = 5V, VO = VCC
Propagation Delay Time	tpd	18	-	36	ns	VCC = 5V, TA = 25掳C, fo = 10MHz
Power Dissipation	PD	-	100	-	mW	VCC = 5V, TA = 25掳C
Operating Temperature Range	TA	0	-	70	掳C	Commercial Grade
Storage Temperature Range	TSTG	-65	-	150	掳C

Instructions for Use

1. Power Supply:

   • Connect the V_CC pin to a 5V supply.
   • Connect the GND pin to ground.

2. Inputs:

   • The SN74LS148N has 8 active-low inputs (I₀ to I₇). Apply a low signal (0V) to the input you want to select.
   • Ensure that all unused inputs are tied to V_CC to prevent floating states.

3. Outputs:

   • The device provides a 3-bit binary code (A, B, C) corresponding to the active input.
   • The active-low output (EO) can be used to cascade multiple SN74LS148N devices.
   • The active-low output (GS) indicates whether any of the inputs are active (low).

4. Enable Pin:

   • The enable pin (E) must be low for the device to operate. If E is high, all outputs are disabled.

5. Propagation Delay:

   • The propagation delay time (t_pd) is the time it takes for a change in the input to affect the output. Ensure your system timing accounts for this delay.

6. Power Dissipation:

   • The maximum power dissipation is 100mW at 5V and 25掳C. Ensure adequate cooling if operating near this limit.

7. Temperature Range:

   • The device is designed to operate within a temperature range of 0掳C to 70掳C for commercial applications. Store the device between -65掳C and 150掳C.

8. Handling:

   • Handle the device with care to avoid static damage. Use proper ESD protection when handling or soldering the device.

9. Cascading:

   • To cascade multiple SN74LS148N devices, connect the EO output of one device to the E input of the next device. This allows you to expand the number of inputs beyond 8.

10. Testing:

    • Test the device by applying low signals to each input in sequence and verifying the corresponding binary output (A, B, C). The GS output should go low when any input is active.

(For reference only)