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HMNR28D

Description
5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM
File Size271KB,13 Pages
ManufacturerHANBIT Electronics
Websitehttp://www.hbe.co.kr/
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HMNR28D Overview

5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM

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 :
(V
PFD
= Power-fail Deselect Voltage)
HMNR28D : V
CC
= 4.5 to 5.5V
4.2V
V
PFD
4.5V
HMNR28DV: V
CC
= 3.0 to 3.6V
2.7V
V
PFD
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
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
Vss
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
Vcc
A8
A9
/WE
/OE
A10
/CE
DQ7
DQ6
DQ5
DQ4
DQ3
24-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 0.0 (March, 2002)
1
HANBit Electronics Co.,Ltd.

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Description 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM 5.0 or 3.3V, 16K bit (2 Kbit x 8) TIMEKEEPER NVSRAM
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