M41T315V-85MH6E Datasheet M41T315V-85MH6E, M41T315V-85MH6F | P4-P6

List of figures M41T315Y, M41T315V, M41T315W

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List of figures

Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figure 2. 16-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 3. 28-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 4. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 5. M41T315Y/V/W to RAM/clock interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 6. Read mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Figure 7. Write mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 8. Comparison register definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 9. Reset pulse waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 10. AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 11. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 12. SO16 - 16-lead plastic small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Figure 13. SOH28 - 28-lead plastic small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 14. SH - 4-pin SNAPHAT housing for 48mAh battery and crystal, package mechanical data . 25

Figure 15. SH - 4-pin SNAPHAT housing for 120mAh battery and crystal, package outline. . . . . . . . 26

M41T315Y, M41T315V, M41T315W Description

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1 Description

The M41T315Y/V/W RTC Supervisor is a combination of a CMOS TIMEKEEPER

and a

nonvolatile memory supervisor. Power is constantly monitored by the memory supervisor. In

the event of power instability or absence, an external battery maintains the timekeeping

operation and provides power for a CMOS static RAM by switching on and invoking write

protection to prevent data corruption in the memory and RTC.

The clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, day, date,

month, and year information. The last day of the month is automatically adjusted for months

with less than 31 days, including leap year correction.

The clock operates in one of two formats:

● a 12-hour mode with an AM/PM indicator;

● a 24-hour mode

The nonvolatile supervisor supplies all the necessary support circuitry to convert a CMOS

RAM to a nonvolatile memory. The M41T315Y/V/W can be interfaced with RAM without

leaving gaps in memory.

The M41T315Y/V/W is supplied in a 28-lead SOIC SNAPHAT® package (which integrates

both crystal and battery in a single SNAPHAT top) or a-16 pin SOIC. The 28-pin, 330mil

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/crystal 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 also keyed to prevent reverse insertion.

The 28-pin 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 “M4TXX-BR12SH” (see Table 17 on page 28).

Caution: Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the

lithium button-cell battery.

Description M41T315Y, M41T315V, M41T315W

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Figure 1. Logic diagram

1. For 16-pin SOIC only

Table 1. Signal names

XI-XO 32.768 KHz crystal connection

D Data input

Q Data output

RST

Reset input

CEO

Chip enable output

CEI

Chip enable input

BAT

Battery input

Output enable input

WRITE enable input

CCO

Switched supply voltage output

CCI

Supply voltage input

Ground

NC Not connected internally

DU Don’t Use

AI03902

CCI

M41T315Y

M41T315V

M41T315W

CEI

CEO

RST

CCO

BAT

(1)

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30

M41T315V-85MH6E

Mfr. #:

Buy M41T315V-85MH6E

Manufacturer:

STMicroelectronics

Description:

Real Time Clock Serial Access 85ns

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

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M41T315V-85MH6E

M41T315V-85MH6E

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