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M48T35AV-10MH1F

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29
List of figures M48T35AV
4/29 Doc ID 6845 Rev 9
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 mode AC waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 7. Chip enable controlled, WRITE mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Checking the BOK flag status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 9. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 10. Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 11. Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 12. AC measurement load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 13. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 14. PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, package outline . . . . . . . . . . . . . . . . . 22
Figure 15. SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT
®
, package outline . . . 23
Figure 16. SH – 4-pin SNAPHAT
®
housing for 48 mAh battery & crystal, pack. outline . . . . . . . . . . . 24
Figure 17. SH – 4-pin SNAPHAT
®
housing for 120 mAh battery & crystal, pack. outline . . . . . . . . . . 25
Figure 18. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
M48T35AV Description
Doc ID 6845 Rev 9 5/29
1 Description
The M48T35AV TIMEKEEPER
®
RAM is a 32 Kbit x 8 non-volatile static RAM and real-time
clock. The monolithic chip is available in two special packages to provide a highly integrated
battery-backed memory and real-time clock solution.
The M48T35AV is a non-volatile pin and function equivalent to any JEDEC standard
32 Kb 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 M48T35AV 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 part numbers are M4T28-BR12SH1 (48
mAh lithium battery SNAPHAT), M4T32-BR12SH1 (120 mAh lithium battery SNAPHAT),
and M4T32-BR12SH6 (120 mAh lithium battery SNAPHAT, –40 to +85 °C crystal).
Figure 1. Logic diagram
AI02797B
15
A0-A14
W
DQ0-DQ7
V
CC
M48T35AV
G
V
SS
8
E
Description M48T35AV
6/29 Doc ID 6845 Rev 9
Table 1. Signal names
Figure 2. DIP connections
Figure 3. SOIC connections
A0-A14 Address inputs
DQ0-DQ7 Data inputs / outputs
E Chip enable
G Output enable
W WRITE enable
V
CC
Supply voltage
V
SS
Ground
A1
A0
DQ0
A7
A4
A3
A2
A6
A5
A13
A10
A8
A9
DQ7
W
A11
G
E
DQ5DQ1
DQ2
DQ3V
SS
DQ4
DQ6
A12
A14 V
CC
AI02798B
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
M48T35AV
AI02799
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
A13
A10
A8
A9
DQ7
W
A11
G
E
DQ5DQ1
DQ2
DQ3V
SS
DQ4
DQ6
A12
A14 V
CC
M48T35AV
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P29

M48T35AV-10MH1F

Mfr. #:
Buy M48T35AV-10MH1F
Manufacturer:
STMicroelectronics
Description:
NVRAM 256K (32Kx8) 100ns
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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