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BUY MM74C89N https://www.utsource.net/itm/p/1536421.html

Below is the parameter table and instructions for the MM74C89N, a 16-bit static RAM (Random Access Memory) IC.

MM74C89N Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	VCC	4.5	5.0	5.5	V
Standby Current	ICC(standby)	-	20	40	μA	VCC = 5V, all inputs high
Active Current	ICC(active)	-	200	300	mA	VCC = 5V, all outputs low
Output High Level	VOH	2.4	3.5	-	V	IOL = -0.4mA, VCC = 5V
Output Low Level	VOL	-	0.4	0.5	V	IOL = 8mA, VCC = 5V
Input High Level	VIH	2.0	-	-	V	VCC = 5V
Input Low Level	VIL	-	-	0.8	V	VCC = 5V
Address Setup Time	tAS	20	-	-	ns	Before rising edge of WE
Address Hold Time	tAH	5	-	-	ns	After rising edge of WE
Data Setup Time	tDS	20	-	-	ns	Before rising edge of WE
Data Hold Time	tDH	5	-	-	ns	After rising edge of WE
Write Enable Pulse Width	tWP	20	-	-	ns	Minimum pulse width
Read Access Time	tAA	150	-	-	ns	From rising edge of OE to valid data output
Output Enable to Output Delay	tOZ	10	-	-	ns	From falling edge of OE to valid data output

Instructions for Using MM74C89N

1. Power Supply:

   • Connect V_CC to +5V and GND to ground.
   • Ensure a stable power supply to avoid data corruption.

2. Addressing:

   • The MM74C89N has 16 address lines (A0-A15) to select one of the 65,536 memory locations.
   • Apply the desired address to these lines before performing read or write operations.

3. Data Input/Output:

   • The data bus consists of 8 lines (D0-D7).
   • During a write operation, data is written to the selected memory location via these lines.
   • During a read operation, data from the selected memory location appears on these lines.

4. Control Signals:

   • Write Enable (WE): When low, data is written to the memory location specified by the address lines.
   • Output Enable (OE): When low, the data from the selected memory location is placed on the data bus.
   • Chip Enable (CE): When low, the chip is active and can perform read/write operations. When high, the chip is in a high-impedance state.

5. Timing Considerations:

   • Ensure that the address and data setup times are met before the rising edge of the WE signal.
   • The address and data hold times must be maintained after the rising edge of the WE signal.
   • The read access time must be considered to ensure that the data is valid on the output lines after the OE signal goes low.

6. Power-Up and Power-Down:

   • During power-up and power-down, avoid accessing the memory to prevent data corruption.
   • Use appropriate pull-up or pull-down resistors on control lines to ensure they are in a known state during power transitions.

7. Handling:

   • Handle the IC with care to avoid static damage.
   • Store and transport the IC in anti-static packaging.

By following these parameters and instructions, you can effectively use the MM74C89N in your electronic projects.

(For reference only)