S93663SB datasheet(2/14 Pages) ETC

Part #	S93663SB

Description	Voltage Monitor and Reset Controller

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2

S93662/S93663

2012 2.0 4/18/00

PIN FUNCTIONS

Pin Name

Function

CS

Chip Select

SK

Clock Input

DI

Serial Data Input

DO

Serial Data Output

VCC

+2.7 to 6.0V Power Supply

GND

Ground

RESET/RESET#

RESET I/O

PIN CONFIGURATION

DEVICE OPERATION

APPLICATIONS

The S93662/663 is ideal for applications requiring low

voltage and low power consumption. This device pro-

vides microcontroller RESET control and can be manu-

ally resettable.

RESET CONTROLLER DESCRIPTION

The S93662/663 provides a precision reset controller

that ensures correct system operation during brownout

and power-up/-down conditions. It is configured with two

open drain reset outputs; pin 7 is an active high output

and pin 6 is an active low output.

During power-up, the reset outputs remain active until

VCC reaches the VTRIP threshold. The outputs will con-

tinue to be driven for approximately 200ms after reach-

ing VTRIP. The reset outputs will be valid so long as VCC

is

≥1.0V.Duringpower-down,theresetoutputswillbegin

driving active when VCC falls below VTRIP.

The reset pins are I/Os; therefore, the S93662/663 can

act as a stabilization circuit for an externally applied

reset. The inputs are edge triggered; that is, the RESET

input will initiate a reset time-out after detecting a low to

high transition and the RESET# input will initiate a reset

time-out after detecting a high to low transition. Refer to

the applications Information section for more details on

device operation as a debounce/reset extender circuit.

It should be noted the reset outputs are open drain.

When used as outputs driving a circuit they need to be

either tied high (RESET#) or tied to ground (RESET)

through the use of pull-up or pull-down resistors. Refer to

the applications aid section for help in determining the

value of resistor to be used. Internally these pins are

weakly pulled up (RESET#) and pulled down (RESET):

therefore, if the signals are not being used the pins may

be left unconnected.

GENERAL OPERATION

The S93662/663 is a 4096-bit nonvolatile memory in-

tended for use with industry standard microprocessors.

The S93663 is organized as X16, seven 11-bit instruc-

tions control the reading, writing and erase operations of

the device. The S93662 is organized as X8, seven 12-

bit instructions control the reading, writing and erase

operations of the device. The device operates on a

single 3V or 5V supply and will generate on chip, the high

voltage required during any write operation.

Instructions, addresses, and write data are clocked into

the DI pin on the rising edge of the clock (SK). The DO

pin is normally in a high impedance state except when

reading data from the device, or when checking the

ready/busy status after a write operation.

The ready/busy status can be determined after the start

of a write operation by selecting the device (CS high) and

polling the DO pin; DO low indicates that the write

operation is not completed, while DO high indicates that

the device is ready for the next instruction. See the

Applications Aid section for detailed use of the ready

busy status.

The format for all instructions is: one start bit; two op code

bits and either eight (x16) or nine (x8) address or instruc-

tion bits.

CS

SK

DI

DO

VCC

RESET

RESET#

GND

1

2

3

4

8

7

6

5

8-Pin PDIP

or 8-Pin SOIC

2012 T PCon 2.0

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