FM32256-G Ver la hoja de datos (PDF) - Ramtron International Corporation

Número de pieza

componentes Descripción

Lista de partido

FM32256-G

Integrated Processor Companion with Memory

Ramtron International Corporation 

FM3204/16/64/256

A1, A0

SCL

SDA

2-Wire

Interface

LockOut

FRAM

Array

LockOut

RST

PFI

PFO

VDD

VBAK

+

- 1.2V

2.5V -

+

Watchdog

LV Detect

Special

Function

Registers

S/N

Switched Power

Event

Counters

CNT1

CNT2

Nonvolatile

Battery Backed

Figure 1. Block Diagram

Pin Descriptions

Pin Name

A0, A1

Type

Input

CNT1, CNT2 Input

PFO

/RST

SDA

Output

I/O

I/O

SCL

PFI

VBAK

VDD

VSS

Input

Input

Supply

Supply

Supply

Pin Description

Device select inputs are used to address multiple memories on a serial bus. To select

the device the address value on the two pins must match the corresponding bits

contained in the device address. The device select pins are pulled down internally.

Event Counter Inputs: These battery-backed inputs increment counters when an edge is

detected on the corresponding CNT pin. The polarity is programmable.

Power Fail Output: This is the early power-fail output.

Active low reset output with weak pull-up. Also input for manual reset.

Serial Data & Address: This is a bi-directional line for the two-wire interface. It is

open-drain and is intended to be wire-OR’d with other devices on the two-wire bus.

The input buffer incorporates a Schmitt trigger for noise immunity and the output

driver includes slope control for falling edges. A pull-up resistor is required.

Serial Clock: The serial clock line for the two-wire interface. Data is clocked out of the

part on the falling edge, and in on the rising edge. The SCL input also incorporates a

Schmitt trigger input for noise immunity.

Early Power-fail Input: Typically connected to an unregulated power supply to detect

an early power failure. This pin should not be left floating.

Backup supply voltage: A 3V battery or a large value capacitor. If VDD<3.6V and no

backup supply is used, this pin should be tied to VDD. If VDD>3.6V and no backup

supply is used, this pin should be left floating and the VBC bit should be set.

Supply Voltage.

Ground

Rev 2.1

Dec. 2004

Page 3 of 20

Share Link: