HMNR28D Datasheet, PDF (1/13 Pages) Hanbit Electronics Co.,Ltd – 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 :
(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.