HANBit

HMNR1288D(V)

URL : www.hbe.co.kr

1

HANBit Electronics Co.,Ltd

Rev. 1.0 (April, 2002)

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 :

■

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

(Valid even during battery back-up mode)

■

PROGRAMMABLE ALARM OUTPUT ACTIVE IN

BATTERY BACK-UP MODE

OPTIONS

MARKING

w

Timing

70 ns

-70

85 ns

-85

5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER NVSRAM

Part No. HMNR1288D(V)

1

32

12

21

14

19

15

18

10

23

11

22

13

20

2

31

3

30

4

29

6

27

9

24

7

26

5

28

8

25

16

17

/RST

IRQ/FT

/CE

/WE

/OE

32-pin Encapsulated Package

PIN ASSIGNMENT