S93462 Datasheet, PDF (2/14 Pages) Summit Microelectronics, Inc. – Precision Supply-Voltage Monitor and Reset Controller

PIN CONFIGURATION
8-Pin SOIC
CS 1
SK 2
DI 3
DO 4
8 VCC
7 RESET
6 RESET#
5 GND
2021 T PCon 2.0
PIN FUNCTIONS
Pin Name
CS
SK
DI
DO
VCC
GND
RESET/RESET#
Function
Chip Select
Clock Input
Serial Data Input
Serial Data Output
+2.7 to 6.0V Power Supply
Ground
RESET I/O
DEVICE OPERATION
APPLICATIONS
The S93462/463 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 S93462/463 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.
S93462/S93463
During power-up, the reset outputs remain active until
VCC reaches the VTRIP threshold. The outputs will con-
tinue to be driven for approximately 150ms after reach-
ing V_TRIP. The reset outputs will be valid so long as V_CC
is ≥ 1.0V. During power-down, the reset outputs will
begin driving active when VCC falls below VTRIP.
The reset pins are I/Os; therefore, the S93462/463 can
act as a signal conditioning 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 ex-
tender 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 S93462/463 is a 1024-bit nonvolatile memory
intended for use with industry standard microproces-
sors. The S93463 is organized as X16, seven 9-bit
instructions control the reading, writing and erase
operations of the device. The S93462 is organized as
X8, seven 10-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.
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2021 4.2 1/23/01
Summit Microelectronics, Inc.