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 :
(V
PFD
= Power-fail Deselect Voltage)
–
HMNR1288D : V
CC
= 4.5 to 5.5V
4.2V
≤
V
PFD
≤
4.5V
–
HMNR1288DV: 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 128K x 8 SRAMS
■
SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE
■
BATTERY LOW WARNING FLAG
■
SOFTWARE CONTROLLED CLOCK CALIBRATION
FOR HIGH ACCURACY APPLICATIONS
PIN ASSIGNMENT
■
MICROPROCESSOR POWER-ON RESET
(Valid even during battery back-up mode)
/RST
1
32
V
CC
■
PROGRAMMABLE ALARM OUTPUT ACTIVE IN
A
16
2
31
A
15
BATTERY BACK-UP MODE
OPTIONS
w
Timing
70 ns
85 ns
MARKING
-70
-85
A
14
A
12
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
3
4
5
6
7
8
9
10
11
12
13
14
15
16
30
29
28
27
26
25
24
23
22
21
20
19
18
17
IRQ/FT
/WE
A
13
A
8
A
9
A
11
/OE
A
10
/CE
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
32-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 1.0 (April, 2002)
1
HANBit Electronics Co.,Ltd
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
