M48T201Y-70MH1E Datasheet M48T201Y-70MH1F, M48T201V-85MH1F, M48T201V-85MH1E | P4-P6

List of tables M48T201Y, M48T201V

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List of tables

Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Table 2. Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Table 3. Read mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 4. Write mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 5. TIMEKEEPER

Table 6. Alarm repeat modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 7. Square wave output frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Table 8. Reset AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Table 9. Default values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Table 10. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Table 11. DC and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 12. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Table 13. DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Table 14. Power down/up mode AC characteristic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 15. SOH44 – 44-lead plastic small outline, SNAPHAT

, pack. mech. data . . . . . . . . . . . . . . . 31

Table 16. SH – 4-pin SNAPHAT

housing for 48 mAh battery & crystal, pack. mech. data . . . . . . . 32

Table 17. SH – 4-pin SNAPHAT

housing for 120 mAh battery & crystal, pack. mech. data . . . . . . 33

Table 18. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 19. SNAPHAT

battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Table 20. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

M48T201Y, M48T201V List of figures

5/37

List of figures

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

Figure 2. SOIC connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Figure 3. Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 4. G

CON

timing when switching between RTC and external SRAM . . . . . . . . . . . . . . . . . . . . 11

Figure 5. Read cycle timing: RTC and external RAM control signals . . . . . . . . . . . . . . . . . . . . . . . . 12

Figure 6. Write cycle timing: RTC and external RAM control signals. . . . . . . . . . . . . . . . . . . . . . . . . 14

Figure 7. Alarm interrupt reset waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 8. Backup mode alarm waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 9. RSTIN1

and RSTIN2 timing waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 10. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 11. Calibration waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Figure 12. Supply voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 13. AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 14. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 15. SOH44 – 44-lead plastic small outline, SNAPHAT

, package outline . . . . . . . . . . . . . . . . 31

Figure 16. SH – 4-pin SNAPHAT

housing for 48 mAh battery & crystal, package outline. . . . . . . . . 32

Figure 17. SH – 4-pin SNAPHAT

housing for 120 mAh battery & crystal, pack. outline . . . . . . . . . . 33

Figure 18. Recycling symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Description M48T201Y, M48T201V

6/37

1 Description

The M48T201Y/V are self-contained devices that include a real time clock (RTC),

programmable alarms, a watchdog timer, and a square wave output which provides control

of up to 512 K x 8 of external low-power static RAM. Access to all RTC functions and the

external RAM is the same as conventional bytewide SRAM. The 16 TIMEKEEPER

registers offer year, month, date, day, hour, minute, second, calibration, alarm, century,

watchdog, and square wave output data. Externally attached static RAMs are controlled by

the M48T201Y/V via the G

CON

and E

CON

signals.

The 44-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 damage due to the

high temperatures required for device surface-mounting. The SNAPHAT housing is keyed to

prevent reverse insertion. The SOIC and battery packages are shipped separately in plastic

anti-static tubes or in tape & reel form. For the 44-lead SOIC, the battery/crystal package

(e.g., SNAPHAT) part number is “M4Txx-BR12SH” (see Table 19 on page 34).

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

lithium button-cell battery.

Figure 1. Logic diagram

AI02240

A0-A18

WDI

DQ0-DQ7

M48T201Y

M48T201V

CON

RSTIN2

RSTIN1

RST

IRQ/FT

OUT

SQW

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P33 P34-P36 P37-P37

M48T201Y-70MH1E

Mfr. #:

Buy M48T201Y-70MH1E

Manufacturer:

STMicroelectronics

Description:

IC RTC CLK/CALENDAR PAR 44-SOH

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

M48T201Y-70MH1E

M48T201Y-70MH1E

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