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PDF ( 数据手册 , 数据表 ) M41ST85

零件编号 M41ST85
描述 5.0 OR 3.0V / 512 bit 64 x 8 SERIAL RTC and NVRAM SUPERVISOR
制造商 ST Microelectronics
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M41ST85 数据手册, 描述, 功能
M41ST85Y
M41ST85W
5.0 OR 3.0V, 512 bit (64 x 8) SERIAL
RTC and NVRAM SUPERVISOR
FEATURES SUMMARY
s 5.0 OR 3.0V OPERATING VOLTAGE
s SERIAL INTERFACE SUPPORTS I2C BUS
(400 KHz)
s NVRAM SUPERVISOR FOR EXTERNAL
LPSRAM
s OPTIMIZED FOR MINIMAL INTERCONNECT
TO MCU
s 2.5 TO 5.5V OSCILLATOR OPERATING
VOLTAGE
s AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
s CHOICE OF POWER-FAIL DESELECT
VOLTAGES
– M41ST85Y: VCC = 4.5 to 5.5V;
4.20V VPFD 4.50V
– M41ST85W: VCC = 2.7 to 3.6V;
2.55V VPFD 2.70V
s 1.25V REFERENCE (for PFI/PFO)
s COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
s 44 BYTES OF GENERAL PURPOSE RAM
s PROGRAMMABLE ALARM and INTERRUPT
FUNCTION (VALID EVEN DURING BATTERY
BACK-UP MODE)
s WATCHDOG TIMER
s MICROPROCESSOR POWER-ON RESET
s BATTERY LOW FLAG
s POWER-DOWN TIMESTAMP (HT BIT)
s ULTRA-LOW BATTERY SUPPLY CURRENT
OF 500nA (MAX)
s PACKAGING INCLUDES A 28-LEAD SOIC and
SNAPHAT® TOP (to be Ordered Separately)
s SOIC SNAPHAT PACKAGE PROVIDES
DIRECT CONNECTION FOR A SNAPHAT
TOP WHICH CONTAINS THE BATTERY and
CRYSTAL
s SOIC EMBEDDED CRYSTAL PACKAGE (MX)
OPTION
Figure 1. 28-pin SOIC Package
SNAPHAT (SH)
Battery & Crystal
28
1
SOH28 (MH)
Figure 2. 28-pin (300mil) SOIC Package
EMBEDDED Crystal
SOX28 (MX)
May 2003
Rev. 4.0
1/33







M41ST85 pdf, 数据表
M41ST85Y, M41ST85W
DC AND AC PARAMETERS
This section summarizes the operating and mea-
surement conditions, as well as the DC and AC
characteristics of the device. The parameters in
the following DC and AC Characteristic tables are
derived from tests performed under the Measure-
ment Conditions listed in the relevant tables. De-
signers should check that the operating conditions
in their projects match the measurement condi-
tions when using the quoted parameters.
Table 3. DC and AC Measurement Conditions
Parameter
VCC Supply Voltage
Ambient Operating Temperature
Load Capacitance (CL)
Input Rise and Fall Times
Input Pulse Voltages
Input and Output Timing Ref. Voltages
Note: Output High Z is defined as the point where data is no longer driven.
M41ST85Y
4.5 to 5.5V
–40 to 85°C
100pF
50ns
0.2 to 0.8VCC
0.3 to 0.7VCC
Figure 8. AC Testing Input/Output Waveforms
M41ST85W
2.7 to 3.6V
–40 to 85°C
50pF
50ns
0.2 to 0.8VCC
0.3 to 0.7VCC
0.8VCC
0.2VCC
0.7VCC
0.3VCC
AI02568
Note: 50pF for M41ST85W.
Table 4. Capacitance
Symbol
Parameter(1,2)
Min
CIN Input Capacitance
COUT(3)
Output Capacitance
tLP Low-pass filter input time constant (SDA and SCL)
Note: 1. Effective capacitance measured with power supply at 5V. Sampled only, not 100% tested.
2. At 25°C, f = 1MHz.
3. Outputs are deselected.
Max
7
10
50
Unit
pF
pF
ns
8/33







M41ST85 equivalent, schematic
M41ST85Y, M41ST85W
Figure 17. Power Down/Up Mode AC Waveforms
VCC
VPFD (max)
VPFD (min)
VSO
tPD
PFO
tF
tFB
tDR
tRB
tR
tREC
INPUTS
RECOGNIZED
DON'T CARE
RECOGNIZED
RST
OUTPUTS
ECON
VALID
(PER CONTROL INPUT)
HIGH-Z
VALID
(PER CONTROL INPUT)
AI03661
Table 7. Power Down/Up AC Characteristics
Symbol
Parameter(1)
Min Typ Max
tF(2) VPFD(max) to VPFD(min) VCC Fall Time
300
tFB(3)
VPFD(min) to VSS VCC Fall Time
10
tPD EX at VIH before Power Down
0
tPFD PFI to PFO Propagation Delay
15 25
tR VPFD(min) to VPFD(max) VCC Rise Time
10
tRB VSS to VPFD(min) VCC Rise Time
1
tREC(4) Power up Deselect Time
40 200
Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 4.5 to 5.5V or 2.7 to 3.6V (except where noted).
2. VPFD(max) to VPFD(min) fall time of less than tF may result in deselection/write protection not occurring until
200µs after VCC passes VPFD(min).
3. VPFD(min) to VSS fall time of less than tFB may cause corruption of RAM data.
4. Programmable (see Table 12, page 25)
Unit
µs
µs
µs
µs
µs
µs
ms
16/33










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