SUMMIT
MICROELECTRONICS, Inc.
S93662/S93663
Precision Supply-Voltage Monitor and Reset Controller
FEATURES
• Precision Monitor & RESET Controller
— RESET and RESET Outputs
— Guaranteed RESET Assertion to V
CC
= 1V
— 200ms Reset Pulse Width
— Internal 1.26V Reference with ±1% Accuracy
— ZERO External Components Required
• Memory
— 4K-bit Microwire Memory
— S93662
– Internally Ties ORG Low
– 100% Compatible With all 8-bit
Implementations
– Sixteen Byte Page Write Capability
— S93663
– Internally Ties ORG High
– 100% Compatible With all 16-bit
Implementations
– Eight Word Page Write Capability
OVERVIEW
The S93662 and S93663 are precision power supervi-
sory circuits providing both active high and active low
reset outputs.
Both devices have 4k-bits of E
2
PROM memory that is
accessible via the industry standard microwire bus. The
S93662 is configured with an internal ORG pin tied low
providing a 8-bit byte organization and the S93663 is
configured with an internal ORG pin tied high providing
a 16-bit word organization. Both the S93662 and
S93663 have page write capability. The devices are
designed for a minimum 100,000 program/erase cycles
and have data retention in excess of 100 years.
BLOCK DIAGRAM
VCC
8
5kHz
OSCILLATOR
RESET
PULSE
GENERATOR
6
RESET#
+
–
VTRIP
RESET
CONTROL
7
RESET
CS
1
1.26V
SK
DI
2
3
MODE
DECODE
ADDRESS
DECODER
WRITE
CONTROL
DATA I/O
DO
4
5
GND
E2PROM
MEMORY
ARRAY
2012 T BD 2.0
SUMMIT MICROELECTRONICS, Inc.
•
300 Orchard City Drive, Suite 131
•
Campbell, CA 95008
•
Telephone 408-378-6461
•
Fax 408-378-6586
•
www.summitmicro.com
© SUMMIT MICROELECTRONICS, Inc. 2000
2012 2.0 4/18/00
1
Characteristics subject to change without notice
S93662/S93663
PIN CONFIGURATION
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 V
CC
falls below V
TRIP
.
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.
8-Pin PDIP
or 8-Pin SOIC
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
RESET
RESET#
GND
2012 T PCon 2.0
PIN FUNCTIONS
Pin Name
CS
SK
DI
DO
V
CC
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 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
V
CC
reaches the V
TRIP
threshold. The outputs will con-
tinue to be driven for approximately 200ms after reach-
2012 2.0 4/18/00
2
S93662/S93663
Read
Upon receiving a READ command and an address
(clocked into the DI pin), the DO pin of the S93662/663
will come out of the high impedance state and, will first
output an initial dummy zero bit, then begin shifting out
the data addressed (MSB first). The output data bits
will toggle on the rising edge of the SK clock and
are stable after the specified time delay
(t
PD0
or t
PD1
).
Write
After receiving a WRITE command, address and the
data, the CS (Chip Select) pin must be deselected for a
minimum of 250ns (t
CSMIN
). The falling edge of CS will
start automatic erase and write cycle to the memory
location specified in the instruction. The ready/busy
status of the S93662/663 can be determined by select-
ing the device and polling the DO pin.
Erase
Upon receiving an ERASE command and address, the
CS (Chip Select) pin must be deselected for a minimum
of 250ns (t
CSMIN
). The falling edge of CS will start the
auto erase cycle of the selected memory location. The
ready/busy status of the S93662/663 can be deter-
mined by selecting the device and polling the DO pin.
Once cleared, the content of a cleared location returns
to a logical “1” state.
Erase/Write Enable and Disable
The S93662/663 powers up in the write disable state.
Any writing after power-up or after an EWDS (write
disable) instruction must first be preceded by the EWEN
(write enable) instruction. Once the write instruction is
enabled, it will remain enabled until power to the device
is removed, or the EWDS instruction is sent. The EWDS
instruction can be used to disable all S93662/663 write
and clear instructions, and will prevent any accidental
tSKHI
SK
t DIS
DI
t CSS
CS
VALID
t SKLOW
t CSH
t DIH
VALID
t DIS
DO
t PD0,t PD1
DATA V ALID
tCSMIN
Figure 1. Sychronous Data Timing
2012 ILL 3 1.0
SK
tCS
CS
STANDBY
AN
DI
1
1
0
tHZ
0
DN
DN–1
D1
D0
2012 ILL4 1.0
AN–1
A0
DO
HIGH-Z
tPD0
HIGH-Z
Figure 2. Read Instruction Timing
2012 2.0 4/18/00
3
S93662/S93663
writing or clearing of the device. Data can be read
normally from the device regardless of the write enable/
disable status.
Erase All
Upon receiving an ERAL command, the CS (Chip
Select) pin must be deselected for a minimum of 250ns
(t
CSMIN
). The falling edge of CS will start the self clocking
clear cycle of all memory locations in the device. The
clocking of the SK pin is not necessary after the device
has entered the self clocking mode. The ready/busy
status of the S93662/663 can be determined by select-
ing the device and polling the DO pin. Once cleared, the
contents of all memory bits return to a logical “1” state.
Write All
Upon receiving a WRAL command and data, the CS
(Chip Select) pin must be deselected for a minimum of
250ns (t
CSMIN
). The falling edge of CS will start the self
clocking data write to all memory locations in the device.
The clocking of the SK pin is not necessary after the
device has entered the self clocking mode. The ready/
busy status of the S93662/663 can be determined by
selecting the device and polling the DO pin. It is not
necessary for all memory locations to be cleared before
the WRAL command is executed.
Page Write
93662
- Assume WEN has been issued. The host will
then take CS high, and begin clocking in the start bit,
write command and 9-bit byte address immediately
followed by the first byte of data to be written. The host
can then continue clocking in 8-bit bytes of data with
each byte to be written to the next higher address.
Internally the address pointer is incremented after
receiving each group of eight clocks; however, once
the address counter reaches x xxxx 1111 it will roll over
to x xxxx 0000 with the next clock. After the last bit is
clocked in no internal write operation will occur until CS
is brought low.
93663
- Assume WEN has been issued. The host will
then take CS high, and begin clocking in the start bit,
write command and 8-bit byte address immediately
followed by the first 16-bit word of data to be written.
The host can then continue clocking in 16-bit words of
data with each word to be written to the next higher
address. Internally the address pointer is incremented
after receiving each group of sixteen clocks; however,
once the address counter reaches xxxx x111 it will roll
over to xxxx x000 with the next clock. After the last bit
is clocked in no internal write operation will occur until
CS is brought low.
Continuous Read
This begins just like a standard read with the host
issuing a read instruction and clocking out the data
byte [word]. If the host then keeps CS high and
continues generating clocks on SK, the S93662/663
will output data from the next higher address location.
The S93662/663 will continue incrementing the ad-
dress and outputting data so long as CS stays high. If
the highest address is reached, the address counter
will roll over to address 0000. . CS going low will reset
the instruction register and any subsequent read must
be initiated in the normal manner of issuing the com-
mand and address.
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S93662/S93663
SK
tCS
CS
AN
DI
1
0
1
tSV
DO
HIGH-Z
tEW
2012 ILL 5 1.0
STATUS
VERIFY
AN-1
A0
DN
D0
STANDBY
BUSY
READY
tHZ
HIGH-Z
Figure 3. Write Instruction Timing
SK
CS
AN
DI
1
1
1
tSV
HIGH-Z
DO
AN-1
A0
STATUS VERIFY
tCS
STANDBY
tHZ
BUSY
tEW
2012 ILL6 1.0
READY
HIGH-Z
Figure 4. Erase Instruction Timing
SK
CS
STANDBY
DI
1
0
0
*
1
2012 ILL 7 1.0
* ENABLE=1
DISABLE=00
Figure 5. EWEN/EWDS Instruction Timing
5
2012 2.0 4/18/00
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