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부품번호 | MK41T56S00TR 기능 |
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기능 | 512 bit 64b x8 Serial Access TIMEKEEPER SRAM | ||
제조업체 | ST Microelectronics | ||
로고 | |||
전체 15 페이지수
MK41T56
MKI41T56
512 bit (64b x8) Serial Access TIMEKEEPER® SRAM
COUNTERS for SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH and YEARS
SOFTWARE CLOCK CALIBRATION
AUTOMATIC POWER-FAIL DETECT and
SWITCH CIRCUITRY
I2C BUS COMPATIBLE
56 BYTES of GENERAL PURPOSE RAM
ULTRA-LOW BATTERY SUPPLY CURRENT of
500nA
OPERATING TEMPERATURE:
– MK41T56: 0 to 70°C
– MKI41T56: –40 to 85°C
AUTOMATIC LEAP YEAR COMPENSATION
8
1
PSDIP8 (N)
0.4mm Frame
8
1
SO8 (S)
150mil Width
DESCRIPTION
The MK41T56 TIMEKEEPER® is a low power 512
bit static CMOS RAM organized as 64 words by 8
bits. Abuilt-in 32.768 kHz oscillator (external crystal
controlled) and the first 8 bytes of the RAM are used
for the clock/calendar function and are configured
in binary coded decimal (BCD) format. Addresses
and data are transferred serially via a two-line
bi-directional bus. The built-in address register is
incremented automatically after each write or read
data byte. The MK41T56 clock has a built-in power
sense circuit which detects power failures and
automatically switches to the battery supply during
power failures. The energy needed to sustain the
RAM and clock operations can be supplied from a
small lithium button cell.
Table 1. Signal Names
OSCI
Oscillator Input
OCSO
Oscillator Output
FT/OUT
Frequency Test / Output Driver
(Open Drain)
SDA
Serial Data Address Input / Output
SCL Serial Clock
VBAT
VCC
VSS
Battery Supply Voltage
Supply Voltage
Ground
March 1999
Figure 1. Logic Diagram
VCC VBAT
OSCI
SCL
MK41T56
MKI41T56
VSS
OSCO
SDA
FT/OUT
AI02304
1/15
MK41T56, MKI41T56
Table 5. Capacitance (1,2)
(TA = 25 °C, f = 1 MHz )
Symbol
Parameter
CIN Input Capacitance (SCL)
COUT (2)
Output Capacitance (SDA, FT/OUT)
Notes: 1. Effective capacitance measured with power supply at 5V.
2. Sampled, not 100% tested.
3. Outputs deselected.
Min
Table 6. DC Characteristics
(TA = 0 to 70°C or –40 to 85°C; VCC = 4.5V to 5.5V)
Symbol
Parameter
Test Condition
ILI Input Leakage Current
ILO Output Leakage Current
ICC1 Supply Current
ICC2 Supply Current (Standby)
0V ≤ VIN ≤ VCC
0V ≤ VOUT ≤ VCC
SCL/SDA = VCC–0.3V
VIL Input Low Voltage
VIH Input High Voltage
VOL
VBAT(1)
Output Low Voltage
Battery Supply Voltage
IOL = 5mA, VCC = 4.5V
IBAT Battery Supply Current
TA = 25°C, VCC = 0V,
Oscillator ON, VBAT = 3V
Note: 1. The RAYOVAC BR1225 or equivalent is recommended as the battery supply.
Min
–0.3
3
2.6
Max Unit
7 pF
10 pF
Typ Max Unit
±10 µA
±10 µA
1 mA
1 mA
1.5 V
VCC + 0.8 V
0.4 V
3 3.5 V
450 500 nA
Table 7. Power Down/Up Trip Points DC Characteristics (1)
(TA = 0 to 70°C or –40 to 85°C)
Symbol
Parameter
Min
VPFD
Power-fail Deselect Voltage
1.2 VBAT
VSO Battery Back-up Switchover Voltage
Note: 1. All voltages referenced to VSS.
Typ
1.25 VBAT
VBAT
Max
1.285 VBAT
Unit
V
V
Table 8. Crystal Electrical Characteristics
(Externally Supplied)
Symbol
Parameter
Min Typ Max Unit
fO Resonant Frequency
32.768
kHz
RS Series Resistance
35 kΩ
CL Load Capacitance
12.5
Notes: Load capacitors are integrated within the MK41T56. Circuit board layout considerations for the 32.768 kHz crystal of
minimum trace lengths and isolation from RF generating signals should be taken into account.
pF
STMicroelectronics recommends the ECS-.327-12.5-8SP-2 quartz crystal is recommended for industrial temperature operations.
ESC Inc. can be contacted at 800-237-1041 or 913-782-7787 for further information on this crystal type.
4/15
4페이지 Figure 6. Serial Bus Data Transfer Sequence
DATA LINE
STABLE
DATA VALID
CLOCK
MK41T56, MKI41T56
DATA
START
CONDITION
CHANGE OF
DATA ALLOWED
STOP
CONDITION
AI00587
Figure 7. Acknowledgement Sequence
SCLK FROM
MASTER
START
1
DATA OUTPUT
BY TRANSMITTER
DATA 1
DATA OUTPUT
BY RECEIVER
2
DATA 2
CLOCK PULSE FOR
ACKNOWLEDGEMENT
89
DATA 8
AI00588
Figure 8. Bus Timing Requirements Sequence
SDA
tBUF
SCL
P
tHD:STA
tR tF
tHIGH
S tLOW
tSU:DAT
tHD:DAT
tHD:STA
tSU:STA
SR
tSU:STO
P
AI00589
7/15
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부품번호 | 상세설명 및 기능 | 제조사 |
MK41T56S00TR | 512 bit 64b x8 Serial Access TIMEKEEPER SRAM | ST Microelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |