DS1248/DS1248P

2 of 21

ORDERING INFORMATION

DS1248YP–XXXY (5V)

- IND Industrial

- 70

70ns access

blank 32-Pin DIP Module

P

34-Pin PowerCap Module board*

DS1248WP-XXXY (3.3V)

- IND Industrial

- 120 120ns access

blank 32-Pin DIP Module

P

34-Pin PowerCap Module board*

*DS9034PCX (PowerCap) Required:

(Must be ordered separately.)

PIN DESCRIPTION

- Address Inputs

CE

- Chip Enable

OE

- Output Enable

WE

- Write Enable

- Power Supply Input

GND

- Ground

- Data In/Data Out

NC

- No Connection

X1, X2

- Crystal Connection

- Battery Connection

RST

- Reset

DESCRIPTION

The DS1248 1024k NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 128k

words by 8 bits) with a built-in real-time clock. The DS1248 has a self-contained lithium energy source

condition occurs, the lithium energy source is automatically switched on and writes protection is

unconditionally enabled to prevent garbled data in both the memory and real-time clock.

PACKAGES

The DS1248 is available in two packages: 32-pin DIP and 34-pin PowerCap module. The 32-pin DIP

style module integrates the crystal, lithium energy source, and silicon in one package. The 34-pin

PowerCap module board is designed with contacts for connection to a separate PowerCap (DS9034PCX)

that contains the crystal and battery. This design allows the PowerCap to be mounted on top of the

DS1248P after completion of the surface mount process. Mounting the PowerCap after the surface mount

process prevents damage to the crystal and battery because of the high temperatures required for solder

reflow. The PowerCap is keyed to prevent reverse insertion. The PowerCap module board and PowerCap

are ordered separately and shipped in separate containers.