M48T36 查看數據表（PDF） - STMicroelectronics
零件编号
产品描述 (功能)
生产厂家
M48T36 Datasheet PDF : 17 Pages
| |||
M48T36
Table 2. Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
TA
Ambient Operating Temperature
0 to 70
°C
TSTG
Storage Temperature (VCC Off, Oscillator Off)
–40 to 85
°C
VIO
Input or Output Voltages
–0.3 to 7
V
VCC
Supply Voltage
–0.3 to 7
V
IO
Output Current
20
mA
PD
Power Dissipation
1
W
Note: Stresses greater than those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this
specification is not implied. Exposure to the absolute maximum ratings conditions for extended periods of time may affect reliability.
CAUTION: Negative undershoots below –0.3 volts are not allowed on any pin while in the Battery Back-up mode.
Figure 2A. DIP Pin Connections
A14
A12
A7
A6
NC
NC
A5
A4
A3
IRQ/FT
RST
WDI
A2
A1
A0
NC
NC
DQ0
DQ1
DQ2
VSSQ
VSS
1
44
2
43
3
42
4
41
5
40
6
39
7
38
8
37
9
36
10
35
11
34
12 M48T36 33
13
32
14
31
15
30
16
29
17
28
18
27
19
26
20
25
21
24
22
23
AI01625
VCC
VCCQ
W
A13
A8
NC
NC
A9
A11
G
NC
NC
A10
E
DQ7
NC
NC
NC
DQ6
DQ5
DQ4
DQ3
Warning: NC = Not Connected
DESCRIPTION
The M48T36 TIMEKEEPER™ RAM is a 32K x 8
non-volatile static RAM and real time clock. The
monolithic chip is available in a special package to
provide a highly integrated battery backed-up
memory and real time clock solution. The M48T36
is a non-volatile pin and function equivalent to any
JEDEC standard 32K x 8 SRAM. It also easily fits
into many ROM, EPROM, and EEPROM sockets,
providing the non-volatility of PROMs without any
requirement for special write timing or limitations on
the number of writes that can be performed.
The 44 pin 330mil SO provides sockets with gold
plated contacts at both ends for direct connection
to a separate SNAPHAT™ housing containing the
battery and crystal. The unique design allows the
SNAPHAT battery package to be mounted on top
of the SO package after the completion of the
surface mount process.
Insertion of the SNAPHAT housing after reflow
prevents potential battery and crystal damage due
to the high temperatures required for device sur-
face-mounting.The SNAPHAT housing is keyed to
prevent reverse insertion.
The SO and battery packages are shipped sepa-
rately in plastic anti-static tubes. The SO package
is also available to ship in Tape & Reel form. For
the 44 lead SO, the battery package (i.e.
SNAPHAT) part number is ”M4T44-BR12SH1”.
As Figure 3 shows, the static memory array and the
quartz controlled clock oscillator of the M48T36 are
integrated on one silicon chip. The two circuits are
interconnectedat the upper eight memory locations
to provide user accessible BYTEWIDE™ clock in-
formation in the bytes with addresses 7FF9h-
7FFFh. The clock locations contain the year,
month, date, day, hour, minute, and second in 24
hour BCD format. Corrections for 28, 29 (leap
year), 30, and 31 day months are made automat-
ically.
2/17
Share Link: 