HANBit
HMNR88D(V)
5.0 or 3.3V, 64K bit (8 Kbit x 8) TIMEKEEPER NVSRAM
Part No. HMNR88D(V)
GENERAL DESCRIPTION
The HMNR88D(V) TIMEKEEPER SRAM is a 8Kbit x 8 non-volatile static RAM and real time clock organized as 8,192
words by 8 bits. The special DIP package provides a fully integrated battery back-up memory and real time clock solution.
The HMNR88D(V) directly replaces industry standard 8Kbit 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)
–
HMNR88D(V) : V
CC
= 4.5 to 5.5V
4.2V
≤
V
PFD
≤
4.5V
–
HMNR88D(V)V: 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 8K x 8 SRAMS
■
SELF-CONTAINED BATTERY and CRYSTAL IN DIP PACKAGE
OPTIONS
w
Timing
70 ns
85 ns
MARKING
-70
-85
PIN ASSIGNMENT
/RST
NC
12
A
A
7
A
6
A
5
A
4
A
3
A
2
A
1
A
0
DQ
0
DQ
1
DQ
2
V
SS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
CC
/WE
NC
A
8
A
9
A
11
/OE
A
10
/CE
DQ
7
DQ
6
DQ
5
DQ
4
DQ
3
28-pin Encapsulated Package
URL : www.hbe.co.kr
Rev. 1.0 (April, 2002)
1
HANBit Electronics Co.,Ltd.
HANBIT [ HANBIT ELECTRONICS CO.,LTD ]
