HMNR28D-70 参数 Datasheet PDF下载

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 :

(V

PFD

= Power-fail Deselect Voltage)

–

HMNR28D : V

CC

= 4.5 to 5.5V

4.2V

≤

V

PFD

≤

4.5V

–

HMNR28DV: 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 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

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

Vss

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

Vcc

A8

A9

/WE

/OE

A10

/CE

DQ7

DQ6

DQ5

DQ4

DQ3

24-pin Encapsulated Package

URL : www.hbe.co.kr

Rev. 0.0 (March, 2002)

1

HANBit Electronics Co.,Ltd.