SN74LS189N: Pilihan Terbaik di United States (USA) Utsource Holding Company Limited

Deskripsi

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64-Bit Random Access Memory with 3-State Outputs

Below is the parameter table and instructions for the SN74LS189N 4-Bit Static RAM (Random Access Memory).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	V_CC	4.75	5.0	5.25	V
Output High Level Voltage	V_OH	2.4	-	3.4	V	I_OL = 0.4 mA
Output Low Level Voltage	V_OL	0.0	-	0.5	V	I_OL = 8.0 mA
Input High Level Voltage	V_IH	2.0	-	5.0	V
Input Low Level Voltage	V_IL	0.0	-	0.8	V
Storage Temperature	T_stg	-65	-	150	°C
Operating Temperature	T_A	0	-	70	°C
Access Time	t_AA	0	45	70	ns	V_CC = 5V, T_A = 25°C
Write Cycle Time	t_WC	0	150	200	ns	V_CC = 5V, T_A = 25°C
Address Setup Time	t_AS	0	25	45	ns	V_CC = 5V, T_A = 25°C
Address Hold Time	t_AH	0	10	20	ns	V_CC = 5V, T_A = 25°C
Data Setup Time	t_DS	0	25	45	ns	V_CC = 5V, T_A = 25°C
Data Hold Time	t_DH	0	10	20	ns	V_CC = 5V, T_A = 25°C
Chip Enable Setup Time	t_CS	0	25	45	ns	V_CC = 5V, T_A = 25°C
Chip Enable Hold Time	t_CH	0	10	20	ns	V_CC = 5V, T_A = 25°C
Output Enable Setup Time	t_OS	0	25	45	ns	V_CC = 5V, T_A = 25°C
Output Enable Hold Time	t_OH	0	10	20	ns	V_CC = 5V, T_A = 25°C

Power Supply:
- Connect V_CC to +5V and GND to ground.
Address Inputs:
- A0, A1, A2, and A3 are the address lines. They select one of the 16 memory locations.
- Ensure that the address lines are stable before the access time (t_AA).
Data Inputs/Outputs:
- D0, D1, D2, and D3 are the data lines. They are used for both reading from and writing to the memory.
- During a write operation, the data lines should be stable during the write cycle time (t_WC).
- During a read operation, the data lines will reflect the contents of the selected memory location after the access time (t_AA).
Control Signals:
- Chip Enable (CE): When CE is low, the chip is enabled. When high, the chip is disabled.
- Write Enable (WE): When WE is low, a write operation is performed. When high, a read operation is performed.
- Output Enable (OE): When OE is low, the outputs are enabled. When high, the outputs are in a high-impedance state.
Timing Considerations:
- Ensure that all setup and hold times are met to avoid data corruption.
- The access time (t_AA) is the time it takes for the data to become valid after the address and control signals are stable.
- The write cycle time (t_WC) is the minimum time required for a complete write operation.
Storage and Operating Conditions:
- Store the device within the storage temperature range (-65°C to 150°C).
- Operate the device within the operating temperature range (0°C to 70°C) for reliable performance.

By following these parameters and instructions, you can ensure proper operation of the SN74LS189N 4-Bit Static RAM.

(For reference only)