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Hanbit Electronics

HMNR28D Datasheet Preview

HMNR28D Datasheet

TIMEKEEPER NVSRAM

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HANBit
HMNR28D(V)
5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM
Part No. HMNR28D(V)
GENERAL DESCRIPTION
The HMNR28D(V) TIMEKEEPER SRAM is a 2Kb x 8 non-volatile static RAM and real time clock organized as 2,048
words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution.
The HMNR28D(V) directly replaces industry standard 2Kbit x 8 SRAMs. It also provides the non-volatility of Flash without
any requirement for special WRITE timing or limitations on the number of WRITEs that can be performed.
FEATURES
INTEGRATED LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY and
CRYSTAL
BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES, and SECONDS
AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION VOLTAGES :
(VPFD = Power-fail Deselect Voltage)
HMNR28D : VCC = 4.5 to 5.5V
4.2V VPFD 4.5V
HMNR28DV: VCC = 3.0 to 3.6V
2.7V VPFD 3.0V
CONVENTIONAL SRAM OPERATION : UNLIMITED WRITE CYCLES
SOFTWARE CONTROLLED CLOCK CALIBRATION FOR HIGH ACCURACY APPLICATIONS
10 YEARS OF DATA RETENTION and CLOCK OPERATION IN THE ABSENCE OF POWER PIN and FUNCTION
COMPATIBLE WITH INDUSTRY STANDARD 2K x 8 SRAMS
SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE
OPTIONS
w Timing
70 ns
85 ns
MARKING
-70
-85
PIN ASSIGNMENT
A7 1
A6 2
A5 3
A4 4
A3 5
A2 6
A1 7
A0 8
DQ0 9
DQ1 10
DQ2 11
Vss 12
24 Vcc
23 A8
22 A9
21 /WE
20 /OE
19 A10
18 /CE
17 DQ7
16 DQ6
15 DQ5
14 DQ4
13 DQ3
24-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 0.0 (March, 2002)
1 HANBit Electronics Co.,Ltd.




Hanbit Electronics

HMNR28D Datasheet Preview

HMNR28D Datasheet

TIMEKEEPER NVSRAM

No Preview Available !

HANBit
HMNR28D(V)
FUNCTIONAL DESCRIPTION
The HMNR28D(V) is a full function, year 2000 compliant (Y2KC), realtime clock/calendar (RTC) and 2k x 8 non-volatile
static RAM. User access to all registers within the HMNR28D(V) is accomplished with a bytewide interface . The Real-
time clock (RTC) information and control bits reside in the sixteen upper most RAM locations. The RTC registers contain
century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for the date of
each month and leap year are made automatically. The RTC clock registers are double buffered to avoid access of
incorrect data that can occur during clock update cycles. The double buffered system also prevents time loss as the
timekeeping countdown continues unabated by access to time register data.
The HMNR28D(V) also contains its own power-fail circuitry which deselects the device when the VCC supply is in an out of
tolerance condition. This feature prevents loss of data from unpredictable system operation brought on by low VCC as
errant access and update cycles are avoided.
BLOCK DIAGRAM
32.768KHz
CRYSTAL
LITHIUM
CELL
OSCILLATOR AND
CLOCK CHAIN
16 x 8
TIMEKEEPER
REGISTER
POWER
VOLTAGE SENSE
AND
SWITCHING
CIRCURITY
VPFD
2,032 x 8
SRAM ARRAY
A0 ~ A10
DQ0 ~ DQ7
/CE
/WE
/OE
A0-A10 : Address Input
/CE : Chip Enable
Vss : Ground
DQ0-DQ7 : Data In / Data Out
Vcc
/WE : Write Enable
/OE : Output Enable
VCC : Power (+5V or +3.3V)
NC : No Connection
Vss
URL : www.hbe.co.kr
Rev. 0.0 (March, 2002)
2
HANBit Electronics Co.,Ltd.


Part Number HMNR28D
Description TIMEKEEPER NVSRAM
Maker Hanbit Electronics
Total Page 13 Pages
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