m4t28-br12sh6tr STMicroelectronics, m4t28-br12sh6tr Datasheet

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m4t28-br12sh6tr

Manufacturer Part Number
m4t28-br12sh6tr
Description
64 Kbit 8kb X8 Timekeeper Sram With Address/data Multiplexed
Manufacturer
STMicroelectronics
Datasheet
DESCRIPTION
The M48T559Y TIMEKEEPER
non-volatile static RAM and real time clock. The
monolithic chip is available in the SNAPHAT pack-
age to provide a highly integrated battery backed-
up memory and real time clock solution.
The 28 pin 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT housing contain-
ing 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.
February 2000
SOFTWARE and HARDWARE RESET for
WATCHDOG TIMER
REGISTER COMPATIBLE with M48T59
TIMEKEEPER SRAM
ADDRESS/DATA MULTIPLEXED I/O PINS
WATCHDOG TIMER - MONITORS OUT of
CONTROL PROCESSOR or HUNG BUS
ALARM with WAKE-UP in BATTERY MODE
INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL CONTROL
CIRCUIT and BATTERY
FREQUENCY TEST OUTPUT for REAL TIME
CLOCK
AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
WRITE PROTECT VOLTAGE
(V
– M48T559Y: 4.2V
PACKAGING INCLUDES a 28-LEAD SOIC
and SNAPHAT
(to be Ordered Separately)
SOIC PACKAGE PROVIDES DIRECT
CONNECTION for a SNAPHAT TOP
CONTAINS the BATTERY and CRYSTAL
MICROPROCESSOR POWER-ON RESET
(Valid even during battery back-up mode)
PROGRAMMABLE ALARM OUTPUT ACTIVE
in the BATTERY BACK-UP MODE
PFD
= Power-fail Deselect Voltage):
®
TOP
V
PFD
®
4.5V
RAM is an 8K x 8
64 Kbit (8Kb x8) TIMEKEEPER
with ADDRESS/DATA MULTIPLEXED
Figure 1. Logic Diagram
RSTIN1
RSTIN2
WDI
AS0
AS1
W
R
E
28
SNAPHAT (SH)
V CC
M48T559Y
Battery/Crystal
V SS
SOH28 (MH)
1
M48T559Y
8
®
AD0-AD7
RST
IRQ/FT
SRAM
AI01674B
1/18

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m4t28-br12sh6tr Summary of contents

Page 1

SOFTWARE and HARDWARE RESET for WATCHDOG TIMER REGISTER COMPATIBLE with M48T59 TIMEKEEPER SRAM ADDRESS/DATA MULTIPLEXED I/O PINS WATCHDOG TIMER - MONITORS OUT of CONTROL PROCESSOR or HUNG BUS ALARM with WAKE-UP in BATTERY MODE INTEGRATED ULTRA LOW POWER SRAM, REAL ...

Page 2

... The SOIC and battery/crystal packages are shipped separately in plastic anti-static tubes or in Tape & Reel form. For the 28 lead SOIC, the bat- tery/crystal package (i.e. SNAPHAT) part number is "M4T28-BR12SH1". Caution: Do not place the SNAPHAT battery/crys- tal top in conductive foam, as this will drain the lith- ium button-cell battery. ...

Page 3

Figure 3. Block Diagram IRQ/FT OSCILLATOR AND CLOCK CHAIN 32,768 Hz CRYSTAL LITHIUM CELL VOLTAGE SENSE AND SWITCHING CIRCUITRY RSTIN1 V CC RSTIN2 (1) Table 3. Operating Modes Mode V CC Deselect Write 4.5V to 5.5V Read Read Deselect V ...

Page 4

M48T559Y Table 4. AC Measurement Conditions Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages Note that Output Hi-Z is defined as the point where data is no longer driven. (1, 2) Table 5. Capacitance ...

Page 5

Table 7. Power Down/Up Trip Points DC Characteristics ( ° Symbol Parameter V Power-fail Deselect Voltage PFD V Battery Back-up Switchover Voltage SO (2) Expected Data Retention Time t DR Note: 1. All voltages ...

Page 6

M48T559Y Table 9. AC Characteristics ( ° 4.5V to 5.5V Symbol t Address Setup Time AS t Address Hold Time AH t Data Setup Time DS t Data Hold Time DH t ...

Page 7

Figure 6. Read Mode AC Waveforms E AS0 AS1 R tAS AD0-AD7 LOW ADDRESS VALID Note: AD5-AD7 are don’t care when latching upper address. Figure 7. Write Mode AC Waveform E AS0 AS1 W tAS AD0-AD7 LOW ADDRESS VALID Note: ...

Page 8

M48T559Y Table 10. Register Map Address 1FFFh 10 Years 1FFEh 1FFDh Date 1FFCh 1FFBh Hours 1FFAh 0 10 Minutes 1FF9h ST 10 Seconds 1FF8h W ...

Page 9

... The STOP bit is the MSB of the seconds register. Setting ’1’ stops the oscillator. The M48T559Y is shipped from STMicroelectronics with the STOP bit set to a ’1’. When reset to a ’0’, the M48T559Y oscillator starts within one second. ...

Page 10

M48T559Y Figure 9. Crystal Accuracy Across Temperature ppm 20 0 -20 -40 -60 -80 -100 0 5 The Calibration byte occupies the five lower order bits (D4-D0) in the Control register (1FF8h). These bits can be set to represent any ...

Page 11

For more information on calibration, see the Appli- cation Note AN934 "TIMEKEEPER Calibration". The IRQ/FT pin is an open drain output which re- quires a pull-up resistor for proper operation. A 500-10k resistor is recommended in order to control the ...

Page 12

M48T559Y Figure 11. Back-up Mode Alarm Waveforms PFD (max) V PFD (min AFE bit in Interrupt Register AF bit in Flags Register IRQ/FT WATCHDOG TIMER The watchdog timer can be used to detect an out- ...

Page 13

Figure 12. Reset Timing Waveforms RSTIN1 RSTIN2 RST tR1 Table 12. Reset AC Characteristics (T Symbol t RSTIN1 Low to RST Low R1 t RSTIN2 Low to RST Low R2 t RSTIN1 High to RST Hi-Z R1HRZ t RSTIN2 High ...

Page 14

... Note: 1. The SOIC package (SOH28) requires the battery/crystal package (SNAPHAT) which is ordered separately under the part number "M48T28-BR12SH1" in plastic tube or "M4T28-BR12SH1TR" in Tape & Reel form. Caution: Do not place the SNAPHAT battery/crystal package "M4T28-BR12SH1" in conductive foam since will drain the lithium button-cell battery. ...

Page 15

Table 15. SOH28 - 28 lead Plastic Small Outline, 4-socket battery SNAPHAT, Package Mechanical Data Symb Typ 1. Figure 14. SOH28 - 28 lead Plastic Small Outline, ...

Page 16

... M48T559Y Table 16. M4T28-BR12SH SNAPHAT Housing for 48mAh Battery & Crystal, Package Mechanical Data Symb Typ Figure 15. M4T28-BR12SH SNAPHAT Housing for 48mAh Battery & Crystal, Package Outline Drawing is not to scale. 16/18 mm Min Max Typ 9.78 6.73 7.24 6.48 6.99 0.38 0.46 0.56 21.21 21.84 14.22 14.99 15.55 15.95 3.20 3.61 2.03 2. inches Min Max 0 ...

Page 17

... Table 17. M4T28-BR12SH SNAPHAT Housing for 120mAh Battery & Crystal, Package Mechanical Data Symb Typ Figure 16. M4T28-BR12SH SNAPHAT Housing for 120mAh Battery & Crystal, Package Outline Drawing is not to scale. mm Min Max Typ 10.54 8.00 8.51 7.24 8.00 0.38 0.46 0.56 21.21 21.84 17.27 18.03 15.55 15.95 3.20 3.61 2.03 2. M48T559Y inches Min Max 0 ...

Page 18

... No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics ...

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