MM58274CV National Semiconductor, MM58274CV Datasheet - Page 3
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MM58274CV
Manufacturer Part Number
MM58274CV
Description
IC MPU 24HR REAL TIME CLK 20PLCC
Manufacturer
National Semiconductor
Type
Clock/Calendarr
Datasheet
1.MM58274CN.pdf
(16 pages)
Specifications of MM58274CV
Time Format
HH:MM:SS:hh (12/24 hr)
Date Format
YY-MM-DD
Interface
Parallel
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Memory Size
-
Other names
*MM58274CV
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MM58274CV
Manufacturer:
NSC
Quantity:
5 510
AC Switching Characteristics
READ TIMING DATA FROM PERIPHERAL TO MICROPROCESSOR V
WRITE TIMING DATA FROM MICROPROCESSOR TO PERIPHERAL V
Note 3 Except for special case restriction with interrupts programmed max read strobe width of control register (ADDR 0) is 30 ms See section on Interrupt
Programming
Note 4 All timings measured to the trailing edge of write strobe (data latched by the trailing edge of WR)
Note 5 Input test waveform peak voltages are 2 4V and 0 4V Output signals are measured to their 2 4V and 0 4V levels
Note 6 Write strobe as used in the Write Timing Table is defined as the period when both chip select and write inputs are low ie WS
strobe commences when both signals are low and terminates when the first signal returns high
Note 7 Read strobe as used in the Read Timing Table is defined as the period when both chip select and read inputs are low ie RS
Note 8 Typical numbers are at V
Symbol
t
t
t
t
t
t
t
t
Symbol
t
t
t
t
t
t
t
t
AD
CSD
RD
RW
RA
CSH
RH
HZ
AW
CSW
DW
WW
WCS
WA
WD
AWS
Address Bus Valid to Data Valid
Chip Select On to Data Valid
Read Strobe On to Data Valid
Read Strobe Width (Note 3 Note 7)
Address Bus Hold Time from Trailing Edge
of Read Strobe
Chip Select Hold Time from Trailing Edge
of Read Strobe
Data Hold Time from Trailing Edge
of Read Strobe
Time from Trailing Edge of Read Strobe
Until O P Drivers are TRI-STATE
Address Bus Valid to Write Strobe
(Note 4 Note 6)
Chip Select On to Write Strobe
Data Bus Valid to Write Strobe
Write Strobe Width (Note 6)
Chip Select Hold Time Following
Write Strobe
Address Bus Hold Time Following
Write Strobe
Data Bus Hold Time Following
Write Strobe
Address Bus Valid Before
Start of Write Strobe
CC
e
5 0V and T
Parameter
Parameter
A
e
25 C
3
Min
400
250
400
250
100
DD
70
DD
0
0
Min
70
e
0
0
e
T
5V
A
T
5V
A
e b
g
Specification
e b
g
Commercial
0 5V C
Specification
0 5V
Commercial
40 C to
Typ
125
100
220
40 C to
95
35
20
Typ
390
140
140
160
L
e
a
100 pF
a
85 C
85 C
Max
Max
650
300
300
250
DC
e
e
CS
CS
a
a
WR Hence write
RD
Units
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns