Details

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BUY 74HC257 https://www.utsource.net/itm/p/12611691.html

Parameter	Symbol	Min	Typ	Max	Unit	Notes
Supply Voltage	VCC	2.0	-	6.0	V
Input Low Voltage	VIL	0	-	1.5	V
Input High Voltage	VIH	3.5	-	VCC	V
Output Low Voltage (IOL = 4 mA)	VOL	0	-	0.4	V
Output High Voltage (IOH = -4 mA)	VOH	VCC - 0.4	-	VCC	V
Input Leakage Current	IIL	-1	-	1	渭A
Output Leakage Current	IOL	-1	-	1	渭A
Propagation Delay Time	tpd	-	18	44	ns	@ VCC = 4.5V, TA = 25掳C
Power Dissipation	PD	-	-	100	mW

Instructions for Using 74HC257:

1. Power Supply:

   • Connect V_CC to the positive supply voltage (2.0V to 6.0V).
   • Connect GND to the ground.

2. Input Signals:

   • Ensure that input signals are within the specified range (0V to V_CC).
   • Use pull-up or pull-down resistors if necessary to avoid floating inputs.

3. Output Signals:

   • The output can drive up to 4 mA when low and sink up to -4 mA when high.
   • Ensure that the load connected to the output does not exceed these current limits.

4. Propagation Delay:

   • The propagation delay is typically 18 ns at V_CC = 4.5V and 25掳C. This value may vary with different supply voltages and temperatures.

5. Operating Temperature:

   • The device is designed to operate over a temperature range of -40掳C to +85掳C.

6. Storage and Handling:

   • Store the device in a dry, cool place to prevent damage from moisture.
   • Handle the device with care to avoid static discharge, which can damage the internal circuits.

7. Testing:

   • When testing the device, ensure that all connections are secure and that the power supply is stable.
   • Use a multimeter to verify the supply voltage and output levels.

8. Application:

   • The 74HC257 is a quad 2-line to 1-line data selector/multiplexer. It can be used to select one of two input signals based on the control inputs.
   • The control inputs (S0, S1) determine which input (A, B) is passed to the output (Y).

By following these instructions, you can ensure reliable operation of the 74HC257 in your circuit design.

(For reference only)