MM58167 NSC [National Semiconductor], MM58167 Datasheet - Page 8

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

Typical Applications
Note 5 A ground line or ground plane guard trace should be included between pins 9 and 10 to insure the oscillator is not disturbed by the address line
Note 6 Must use 8238 or equivalent logic to insure advanced I OW pulse so that the ready output of the MM58167B is valid by the end of 2 during the T2
microcycle
Note 7 t
2 t
t
RS8080
a
t
DL8238
a
t
WRY58167B
FIGURE 6 8080 System Interface with Battery Backup
FIGURE 5 Typical Connection Diagram
8
R1
C1
R2 to be selected
based on crystal used
e
e
20 M
6 pF
b
g
36 pF
20%
TL F 11070– 8
TL F 11070– 9