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M48T18-100PC1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P31
List of figures M48T08, M48T08Y, M48T18
4/31 Doc ID 2411 Rev 11
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. DIP connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. SOIC connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. READ mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6. WRITE enable controlled, WRITE AC waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. Chip enable controlled, WRITE AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 9. Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 11. AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 12. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 13. PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, package outline . . . . . . . . . . . . . . . . . 23
Figure 14. SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT
®
, package outline . . . 24
Figure 15. SH – 4-pin SNAPHAT
®
housing for 48 mAh battery & crystal, package outline. . . . . . . . . 25
Figure 16. SH – 4-pin SNAPHAT
®
housing for 120 mAh battery & crystal, package outline. . . . . . . . 26
Figure 17. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
M48T08, M48T08Y, M48T18 Description
Doc ID 2411 Rev 11 5/31
1 Description
The M48T08/18/08Y TIMEKEEPER
®
RAM is an 8 K x 8 non-volatile static RAM and real-
time clock which is pin and function compatible with the DS1643. The monolithic chip is
available in two special packages to provide a highly integrated battery-backed memory and
real-time clock solution.
The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard
8 K 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 28-pin, 600 mil DIP CAPHAT™ houses the M48T08/18/08Y silicon with a quartz crystal
and a long-life lithium button cell in a single package.
The 28-pin, 330 mil SOIC 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 SOIC 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 surface-mounting. The SNAPHAT
®
housing is keyed to prevent reverse insertion.
The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or
in tape & reel form. For the 28-lead SOIC, the battery/crystal package (e.g., SNAPHAT
®
)
part number is “M4T28-BR12SH” or “M4T32-BR12SH”.
Figure 1. Logic diagram
AI01020
13
A0-A12
W
DQ0-DQ7
V
CC
M48T08
M48T08Y
M48T18
G
E2
V
SS
8
E1 INT
Description M48T08, M48T08Y, M48T18
6/31 Doc ID 2411 Rev 11
Table 1. Signal names
Figure 2. DIP connections
Figure 3. SOIC connections
A0-A12 Address inputs
DQ0-DQ7 Data inputs / outputs
INT Power fail interrupt (open drain)
E1 Chip enable 1
E2 Chip enable 2
G Output enable
W WRITE enable
V
CC
Supply voltage
V
SS
Ground
A1
A0
DQ0
A7
A4
A3
A2
A6
A5
E2
A10
A8
A9
DQ7
W
A11
G
E1
DQ5DQ1
DQ2
DQ3V
SS
DQ4
DQ6
A12
INT V
CC
AI01182
M48T08
M48T18
8
1
2
3
4
5
6
7
9
10
11
12
13
14
16
15
28
27
26
25
24
23
22
21
20
19
18
17
AI01021B
8
2
3
4
5
6
7
9
10
11
12
13
14
22
21
20
19
18
17
16
15
28
27
26
25
24
23
1
A1
A0
DQ0
A7
A4
A3
A2
A6
A5
E2
A10
A8
A9
DQ7
W
A11
G
E1
DQ5DQ1
DQ2
DQ3V
SS
DQ4
DQ6
A12
INT V
CC
M48T08Y
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P31

M48T18-100PC1

Mfr. #:
Buy M48T18-100PC1
Manufacturer:
STMicroelectronics
Description:
Real Time Clock 64K (8Kx8) 100ns
Lifecycle:
New from this manufacturer.
Delivery:
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