M41T315V-65MQ6 datasheet, PDF - EEWORLD Datasheet

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M41T315V-65MQ6: DescriptionSerial access phantom RTC supervisor; File Size196KB，30 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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M41T315V-65MQ6 Overview

Serial access phantom RTC supervisor

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M41T315Y

M41T315V, M41T315W

Serial access phantom RTC supervisor

Not For New Design

Features

■

3.0V, 3.3V, or 5V operating voltage

Real-time clock keeps track of

tenths/hundredths of seconds, seconds,

minutes, hours, days, date of the month,

months, and years

Automatic leap year correction valid up to 2100

Automatic switch-over and deselect circuitry

Choice of power-fail deselect voltages:

PFD

= power-fail deselect voltage)

– M41T315Y

(a)

: V

= 4.5 to 5.5V

4.25V

≤

PFD

≤

4.50V

– M41T315V: V

= 3.0 to 3.6V

2.80V

≤

PFD

≤

2.97V

– M41T315W: V

= 2.7 to 3.3V

2.60V

≤

PFD

≤

2.70V

No address space required to communicate

with RTC

Provides nonvolatile supervisor functions for

battery backup of SRAM

Full

10% V

operating range

Industrial operating temperature range (–40 to

+85°C)

Ultra-low battery supply current of 500nA (max)

Optional packaging includes A 28-lead SOIC

and SNAPHAT

top (to be ordered separately)

SNAPHAT package provides direct connection

for a snaphat top, which contains the battery

and crystal

RoHS compliant

– Lead-free second level interconnect

■

SO16 (MQ)

SNAPHAT (SH)

battery & crystal

■

SOH28 (MH)

■

a. Contact local ST sales office for availability.

November 2007

Rev 3

1/30

www.st.com

This is information on a product still in production but not recommended for new designs.

M41T315Y, M41T315V, M41T315W

List of tables

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Table 9.

Table 10.

Table 11.

Table 12.

Table 13.

Table 14.

Table 15.

Table 16.

Table 17.

Table 18.

Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

AC electrical characteristics (M41T315Y). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

AC electrical characteristics (M41T315V/W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

RTC register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Ablolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

DC and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Crystal electrical characteristics (externally supplied) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

SO16 - 16-lead plastic small outline (150 mils body width), package mechanical data . . . 23

SOH28 - 28-lead plastic small outline, package mechanical data . . . . . . . . . . . . . . . . . . . 24

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

SH - 4-pin SNAPHAT housing for 120mAh battery and crystal, package mechanical data 26

Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

SNAPHAT battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3/30

List of figures

M41T315Y, M41T315V, M41T315W

List of figures

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Figure 11.

Figure 12.

Figure 13.

Figure 14.

Figure 15.

Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

16-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

28-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

Read mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Write mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Comparison register definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Reset pulse waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

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

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

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

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

4/30

M41T315Y, M41T315V, M41T315W

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.

5/30

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