M48T35AY-70PC6F datasheet, PDF

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M48T35AY-70PC6F: Description0 TIMER(S), REAL TIME CLOCK, PDIP28; Categorysemiconductor The embedded processor and controller; File Size143KB，25 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/

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M48T35AY-70PC6F Overview

0 TIMER(S), REAL TIME CLOCK, PDIP28

M48T35AY-70PC6F 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, PLASTIC, DIP-28
state	ACTIVE
packaging shape	RECTANGULAR
Package Size	IN-LINE
Terminal form	THROUGH-HOLE
Terminal spacing	2.54 mm
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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M48T35AY

M48T35AV

5.0 or 3.3V, 256 Kbit (32 Kb x8) TIMEKEEPER

SRAM

FEATURES SUMMARY

■

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

BATTERY LOW FLAG (BOK)

FREQUENCY TEST OUTPUT FOR REAL

TIME CLOCK

AUTOMATIC POWER-FAIL CHIP

DESELECT AND WRITE PROTECTION

WRITE PROTECT VOLTAGES

PFD

= Power-fail Deselect Voltage):

– M48T35AY: V

= 4.5 to 5.5V

4.2V

≤

PFD

≤

4.5V

– M48T35AV: V

= 3.0 to 3.6V

2.7V

≤

PFD

≤

3.0V

SELF-CONTAINED BATTERY AND

CRYSTAL IN THE CAPHAT™ DIP

PACKAGE

SOIC PACKAGE PROVIDES DIRECT

CONNECTION FOR A SNAPHAT

HOUSING CONTAINING THE BATTERY

AND CRYSTAL

SNAPHAT

HOUSING (BATTERY AND

CRYSTAL) IS REPLACEABLE

PIN AND FUNCTION COMPATIBLE WITH

JEDEC STANDARD 32Kb x8 SRAMs

Figure 1. 28-pin, PCDIP CAPHAT™ Package

PCDIP28 (PC)

Battery/Crystal

CAPHAT

Figure 2. 28-pin SOIC Package

SNAPHAT (SH)

Battery/Crystal

SOH28 (MH)

April 2004

1/25

M48T35AY, M48T35AV

TABLE OF CONTENTS

FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 1. 28-pin, PCDIP CAPHAT™ Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Figure 2. 28-pin SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Figure 3.

Table 1.

Figure 4.

Figure 5.

Figure 6.

Logic Diagram . . . . . . . . . . . . . . . . . . . . .

Signal Names . . . . . . . . . . . . . . . . . . . . .

DIP Connections . . . . . . . . . . . . . . . . . . .

SOIC Connections . . . . . . . . . . . . . . . . . .

Block Diagram . . . . . . . . . . . . . . . . . . . . .

.......

......

.......

......

.....4

.....5

OPERATION MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 2. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

READ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 7. READ Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 3. READ Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

WRITE Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 8. WRITE Enable Controlled, WRITE Mode AC Waveform. . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 9. Chip Enable Controlled, WRITE Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Table 4. WRITE Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Data Retention Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 10.Checking the BOK Flag Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

CLOCK OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Reading the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Setting the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Stopping and Starting the Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 5. Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Calibrating the Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Century Bit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 11.Crystal Accuracy Across Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Figure 12.Clock Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Noise And Negative Going Transients. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 13.Supply Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 6. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 7. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . .

Figure 14.AC Measurement Load Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 8. Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table 9. DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

......

. . . . 16

. . . . 17

2/25

M48T35AY, M48T35AV

Figure 15.Power Down/Up Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 10. Power Down/Up AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 11. Power Down/Up Trip Points DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 16.PCDIP28 – 28-pin Plastic DIP, battery CAPHAT™, Package Outline . . . . . . . . . . . . . . 19

Table 12. PCDIP28 – 28-pin Plastic DIP, battery CAPHAT™, Package Mechanical Data . . . . . . . 19

Figure 17.SOH28 – 28-lead Plastic Small Outline, 4-socket battery SNAPHAT, Package Outline. 20

Table 13. SOH28 – 28-lead Plastic Small Outline, 4-socket battery SNAPHAT, Pack. Mech. Data 20

Figure 18.SH – 4-pin SNAPHAT Housing for 48mAh Battery & Crystal, Package Outline . . . . . . . 21

Table 14. SH – 4-pin SNAPHAT Housing for 48mAh Battery & Crystal, Package Mech. Data. . . . 21

Figure 19.SH – 4-pin SNAPHAT Housing for 120mAh Battery & Crystal, Package Outline . . . . . . 22

Table 15. SH – 4-pin SNAPHAT Housing for 120mAh Battery & Crystal, Package Mech. Data. . . 22

PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 16. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 17. SNAPHAT Battery Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Table 18. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3/25

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