M48T08Y-10PC1TR datasheet, PDF

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M48T08Y-10PC1TR: Description0 TIMER(S), REAL TIME CLOCK, PDIP28; Categorysemiconductor The embedded processor and controller; File Size452KB，31 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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M48T08Y-10PC1TR Overview

0 TIMER(S), REAL TIME CLOCK, PDIP28

M48T08Y-10PC1TR Parametric

Parameter Name	Attribute value
Number of functions	1
Number of terminals	28
Maximum operating temperature	70 Cel
Minimum operating temperature	0.0 Cel
Maximum supply/operating voltage	5.5 V
Minimum supply/operating voltage	4.5 V
Rated supply voltage	5 V
External data bus width	8
Processing package description	0.600 INCH, ROHS COMPLIANT, PLASTIC, PCDIP-28
Lead-free	Yes
EU RoHS regulations	Yes
state	ACTIVE
Craftsmanship	CMOS
packaging shape	RECTANGULAR
Package Size	IN-LINE
Terminal form	THROUGH-HOLE
Terminal spacing	2.54 mm
terminal coating	MATTE TIN
Terminal location	DUAL
Packaging Materials	PLASTIC/EPOXY
Temperature level	COMMERCIAL
Maximum FCLK clock frequency	0.0320 MHz
Information access methods	PARALLEL, DIRECT ADDRESS
Microprocessor type	REAL TIME CLOCK
Number of timers	0.0

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M48T08

M48T08Y, M48T18

5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER

SRAM

Features

■

Integrated ultra low power SRAM, real-time

clock, power-fail control circuit, and battery

BYTEWIDE

™

RAM-like clock access

BCD coded year, month, day, date, hours,

minutes, and seconds

Typical clock accuracy of ±1 minute a month, at

25 °C

Automatic power-fail chip deselect and WRITE

protection

WRITE protect

PFD

= power-fail deselect voltage):

– M48T08: V

= 4.75 to 5.5 V;

4.5 V

≤

PFD

≤

4.75 V

– M48T18/T08Y: V

= 4.5 to 5.5 V;

4.2 V

≤

PFD

≤

4.5 V

Software controlled clock calibration for high

accuracy applications

Self-contained battery and crystal in the

CAPHAT

™

DIP package

Packaging includes a 28-lead SOIC and

SNAPHAT

top (to be ordered separately)

SOIC package provides direct connection for a

snaphat top which contains the battery and

crystal

Pin and function compatible with DS1643 and

JEDEC standard 8 K x 8 SRAMs

RoHS compliant

– Lead-free second level interconnect

PCDIP28

battery/crystal

CAPHAT™

■

SNAPHAT

battery/crystal

■

SOH28

June 2011

Doc ID 2411 Rev 11

1/31

www.st.com

Contents

M48T08, M48T08Y, M48T18

Contents

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operation modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1

2.2

2.3

2.4

READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Power-fail interrupt pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Clock operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1

3.2

3.3

3.4

3.5

Reading the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Setting the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Stopping and starting the oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . 18

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2/31

Doc ID 2411 Rev 11

M48T08, M48T08Y, M48T18

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

READ mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

WRITE mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, package mech. data . . . . . . . . . . . . . 23

SOH28 – 28-lead plastic SO, 4-socket battery SNAPHAT

, package mech. data. . . . . . . 24

SH – 4-pin SNAPHAT

housing for 48 mAh battery & crystal, package mech. data . . . . . 25

SH – 4-pin SNAPHAT

housing for 120 mAh battery & crystal, package mech. data . . . . 26

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

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

Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Doc ID 2411 Rev 11

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List of figures

M48T08, M48T08Y, M48T18

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.

Figure 16.

Figure 17.

Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

DIP connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

READ mode AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

WRITE enable controlled, WRITE AC waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Chip enable controlled, WRITE AC waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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

PCDIP28 – 28-pin plastic DIP, battery CAPHAT™, package outline . . . . . . . . . . . . . . . . . 23

SOH28 – 28-lead plastic small outline, 4-socket battery SNAPHAT

, package outline . . . 24

SH – 4-pin SNAPHAT

housing for 48 mAh battery & crystal, package outline. . . . . . . . . 25

SH – 4-pin SNAPHAT

housing for 120 mAh battery & crystal, package outline. . . . . . . . 26

Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4/31

Doc ID 2411 Rev 11

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