BUY SN54LS373J https://www.utsource.net/itm/p/357244.html
These 8-bit registers feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. The high-impedance 3-state and increased high-logic-level drive provide these registers with the capability of being connected directly to and driving the bus lines in a bus-organized system without need for interface or pullup components. These devices are particularly attractive for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. The eight latches of the ’LS373 and ’S373 are transparent D-type latches, meaning that while the enable (C or CLK) input is high, the Q outputs follow the data (D) inputs. When C or CLK is taken low, the output is latched at the level of the data that was set up. The eight flip-flops of the ’LS374 and ’S374 are edge-triggered D-type flip-flops. On the positive transition of the clock, the Q outputs are set to the logic states that were set up at the D inputs. Schmitt-trigger buffered inputs at the enable/clock lines of the ’S373 and ’S374 devices simplify system design as ac and dc noise rejection is improved by typically 400 mV due to the input hysteresis. A buffered output-control (OC) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. OC does not affect the internal operation of the latches or flip-flops. That is, the old data can be retained or new data can be entered, even while the outputs are off.

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	VCC	Operating	4.75	5	5.25	V
Input Low Voltage	VIL	VCC = 5V	0	-	0.8	V
Input High Voltage	VIH	VCC = 5V	2	-	5	V
Output Low Voltage	VOL	IOL = 16mA	0	0.4	0.5	V
Output High Voltage	VOH	IOH = -0.4mA	2.4	2.7	5	V
Propagation Delay Time	tpd	VCC = 5V, TA = 25°C	-	22	-	ns
Power Dissipation	PD	Per Package	-	-	350	mW
Operating Temperature Range	TA	Commercial Grade	0	-	70	°C
Storage Temperature Range	TSTG		-65	-	150	°C

Instructions for Use:

1. Power Supply:

   • Ensure the supply voltage (V_CC) is within the specified range (4.75V to 5.25V) to avoid damage to the device.
   • Use a stable power source to maintain consistent operation.

2. Input Levels:

   • Inputs should be driven with voltages that meet the specified input low (V_IL) and high (V_IH) levels.
   • Avoid floating inputs by connecting them to either V_CC or GND when not in use.

3. Output Levels:

   • The output low (V_OL) and high (V_OH) levels should be within the specified ranges to ensure proper logic levels.
   • Ensure the load connected to the outputs does not exceed the maximum current ratings.

4. Propagation Delay:

   • The propagation delay time (t_pd) is critical for timing considerations in digital circuits. Use this value to design your timing diagrams.

5. Temperature Considerations:

   • Operate the device within the specified temperature range (0°C to 70°C) for commercial applications.
   • Store the device in the specified storage temperature range (-65°C to 150°C).

6. Power Dissipation:

   • The maximum power dissipation (P_D) per package is 350mW. Ensure adequate heat sinking if operating near this limit to prevent overheating.

7. Handling:

   • Handle the device with care to avoid static discharge, which can damage sensitive components.
   • Follow proper ESD (Electrostatic Discharge) handling procedures.

8. Schematic Design:

   • Use the device in accordance with the recommended circuit configurations and layout guidelines provided in the datasheet to ensure optimal performance.

(For reference only)