Details

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BUY DM74ALS245AN https://www.utsource.net/itm/p/11242626.html
IC TXRX NON-INVERT 5.5V 20DIP

Parameter	Description	Min	Typ	Max	Unit
Supply Voltage (VCC)	Operating supply voltage	4.75	-	5.25	V
Output Voltage (VOH)	Output high level voltage	-	2.4	-	V (at IOH = -0.4 mA, VCC = 5V)
Output Voltage (VOL)	Output low level voltage	-	0.4	-	V (at IOL = 8 mA, VCC = 5V)
Input Voltage (VIH)	Input high level voltage	2.0	-	-	V
Input Voltage (VIL)	Input low level voltage	-	-	0.8	V
Propagation Delay Time (tpd)	Time delay from input to output	-	19	-	ns (typical at VCC = 5V, TA = 25°C)
Power Dissipation (PD)	Maximum power dissipation	-	-	360	mW
Operating Temperature Range (TA)	Ambient operating temperature	-40	-	85	°C
Storage Temperature Range (TSTG)	Storage temperature	-65	-	150	°C

Instructions for Use:

1. Power Supply:

   • Ensure the supply voltage (V_CC) is within the range of 4.75V to 5.25V.
   • Connect the ground (GND) pin to the system ground.

2. Input and Output Signals:

   • The device has 8 bidirectional data lines (A1-A8 and B1-B8).
   • Use the direction control inputs (DIR and /DIR) to control the direction of data transfer.
     • DIR = 0, /DIR = 1: Data flows from A to B.
     • DIR = 1, /DIR = 0: Data flows from B to A.
   • Ensure input signals are within the valid logic levels (V_IH and V_IL).

3. Propagation Delay:

   • The typical propagation delay time (t_pd) is 19 ns at V_CC = 5V and T_A = 25°C.
   • Consider this delay when designing your circuit to ensure proper timing.

4. Power Dissipation:

   • The maximum power dissipation (P_D) is 360 mW. Ensure adequate heat dissipation if operating near this limit.

5. Temperature Considerations:

   • The device operates reliably within the ambient temperature range of -40°C to 85°C.
   • Store the device in an environment with temperatures between -65°C and 150°C.

6. Handling and Storage:

   • Handle the device with care to avoid static damage.
   • Store in a dry, cool place to prevent moisture damage.

7. Testing and Verification:

   • Verify the functionality of the device using standard digital test equipment.
   • Check for correct operation by monitoring the output signals with an oscilloscope or logic analyzer.

8. Layout and PCB Design:

   • Use proper decoupling capacitors (typically 0.1 μF) close to the V_CC and GND pins to minimize noise.
   • Ensure signal traces are short and direct to reduce signal degradation.

By following these guidelines, you can ensure reliable and efficient operation of the DM74ALS245AN bidirectional bus transceiver.

(For reference only)