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HMNR28DV-85I Datasheet(PDF) 1 Page - Hanbit Electronics Co.,Ltd

Part # HMNR28DV-85I
Description  5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM
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Manufacturer  HANBIT [Hanbit Electronics Co.,Ltd]
Direct Link  http://www.hbe.co.kr
Logo HANBIT - Hanbit Electronics Co.,Ltd

HMNR28DV-85I Datasheet(HTML) 1 Page - Hanbit Electronics Co.,Ltd

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HANBit
HMNR28D(V)
URL : www.hbe.co.kr
1
HANBit Electronics Co.,Ltd.
Rev. 0.0 (March, 2002)
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
MARKING
w
Timing
70 ns
-70
85 ns
-85
5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM
Part No. HMNR28D(V)
PIN ASSIGNMENT
24-pin Encapsulated Package
1
24
12
13
10
15
11
14
2
23
3
22
4
21
6
19
9
16
7
18
5
20
8
17
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
Vss
Vcc
A8
A9
/WE
/OE
A10
/CE
DQ7
DQ6
DQ5
DQ4
DQ3


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