54F189 NSC [National Semiconductor], 54F189 Datasheet - Page 2

• Manufacturer Part Number: 54F189
• Description: 64-Bit Random Access Memory with TRI-STATEE Outputs
• Manufacturer: NSC [National Semiconductor]

Unit Loading Fan Out
H
L
X
Block Diagram
CS WE
Pin Names
A
CS
WE
D
O
H
e
L
L
e
e
Inputs
0
0
0
–A
–D
LOW Voltage Level
–O
Immaterial
HIGH Voltage Level
3
3
3
H
X
L
Operation
Inhibit
Read
Address Inputs
Chip Select Input (Active LOW)
Write Enable Input (Active LOW)
Data Inputs
Inverted Data Outputs
Write
Function Table
Description
High Impedance
Complement of Stored Data
High Impedance
Condition of Outputs
150 40 (33 3)
HIGH LOW
1 0 1 0
1 0 1 0
1 0 1 0
1 0 1 0
U L
2
54F 74F
b
3 0 mA 24 mA (20 mA)
20 A
20 A
20 A
20 A
Output I
Input I
b
b
b
b
IH
OH
0 6 mA
1 2 mA
0 6 mA
0 6 mA
I
IL
I
OL
TL F 9493– 5