MM58167 NSC [National Semiconductor], MM58167 Datasheet - Page 7

• Manufacturer Part Number: MM58167
• Description: Microprocessor Real Time Clock
• Manufacturer: NSC [National Semiconductor]

Write Cycle Timing
Note 4 If data changes while CS and WR are low then they must remain coincident for 1050 ns after the data change to ensure a valid write Data bus loading is
100 pF Ready output loading is 50 pF and 3 k
Input and output AC timing levels
Read and Write Cycle Timing Diagrams
Logical one
Logical zero
Symbol
t
t
t
t
t
t
t
t
AW
CSW
DW
WRY
RY
RYH
WD
WA
e
e
2 0V
0 8V
Address Valid to Write Strobe
Chip Select to Write Strobe
Data Valid before Write Strobe
Write Strobe to Ready Strobe
Ready Strobe Width
Write Hold Time after Ready Strobe
Data Hold Time after Write Strobe
Address Hold Time after Write Strobe
0 C
s
T
pull-up
Parameter
A s
70 C 4 5V
FIGURE 3 Read Cycle Timing
FIGURE 4 Write Cycle Timing
s
V
DD s
7
5 5V V
SS
e
0V
Min
100
100
110
50
0
0
Max
150
800
TL F 11070– 6
TL F 11070– 7
Units
ns
ns
ns
ns
ns
ns
ns
ns