HANBit
HMNR1288D(V)
5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER NVSRAM
Part No. HMNR1288D(V)
GENERAL DESCRIPTION
The HMNR1288D(V) TIMEKEEPER SRAM is a 128Kb x 8 non-volatile static RAM and real time clock organized as
131,072 words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock
solution. The HMNR1288D(V) directly replaces industry standard 128Kbit 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
■ YEAR 2000 COMPLIANT
■ 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)
– HMNR1288D : VCC = 4.5 to 5.5V
4.2V ≤ VPFD ≤ 4.5V
– HMNR1288DV: 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 128K x 8 SRAMS
■ SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE
■ BATTERY LOW WARNING FLAG
■ SOFTWARE CONTROLLED CLOCK CALIBRATION
FOR HIGH ACCURACY APPLICATIONS
■ MICROPROCESSOR POWER-ON RESET
PIN ASSIGNMENT
(Valid even during battery back-up mode)
■ PROGRAMMABLE ALARM OUTPUT ACTIVE IN
BATTERY BACK-UP MODE
/RST
A16
A14
1
2
3
4
32
31
30
29
VCC
A15
IRQ/FT
/WE
A13
A8
A9
A11
/OE
A10
/CE
DQ7
DQ6
DQ5
DQ4
DQ3
A12
5
6
7
8
28
27
26
25
24
23
22
21
20
19
18
17
A7
A6
A5
A4
A3
A2
OPTIONS
w Timing
70 ns
MARKING
9
10
11
12
13
14
15
16
-70
-85
A1
A0
DQ0
DQ1
DQ2
VSS
85 ns
32-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 1.0 (April, 2002)
1
HANBit Electronics Co.,Ltd
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
