DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM

2 of 18

PIN DESCRIPTION

A0–A16

- Address Input

DQ0–DQ7

- Data Input/Outputs

IRQ/FT

- Interrupt, Frequency Test Output (Open Drain)

RST

- Power-On Reset Output (Open Drain)

CE

- Chip Enable

OE

- Output Enable

WE

- Write Enable

- Power Supply Input

GND

- Ground

N.C.

- No Connection

X1, X2

- Crystal Connection

- Battery Connection

ORDERING INFORMATION

PART

TEMP RANGE

VOLTAGE

(V)

PIN-PACKAGE

TOP MARK**

DS1556-70+

0°C to +70°C

5.0

32 EDIP (0.740a)

DS1556+070

DS1556-70IND+

-40°C to +85°C

5.0

32 EDIP (0.740a)

DS1556+070 IND

DS1556P-70+

0°C to +70°C

5.0

34 PowerCap*

DS1556P+70

DS1556P-70IND+

-40°C to +85°C

5.0

34 PowerCap*

DS1556P+70 IND

DS1556W-120+

0°C to +70°C

3.3

32 EDIP (0.740a)

DS1556W+120

DS1556W-120IND+

-40°C to +85°C

3.3

32 EDIP (0.740a)

DS1556W+120 IND

DS1556WP-120+

0°C to +70°C

3.3

34 PowerCap*

DS1556WP+120

DS1556WP-120IND+

-40°C to +85°C

3.3

34 PowerCap*

DS1556WP+120 IND

+Denotes a lead(Pb)-free/RoHS-compliant package.

*DS9034-PCX+ or DS9034I-PCX+ required (must be ordered separately).

**A “+” in top mark denotes a lead(Pb)-free device. An “IND” anywhere on the top mark indicates an industrial temperature grade device.