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XL9020 Datasheet Preview

XL9020 Datasheet

2/048-Bit Serial Electrically Erasable PROM 2.7 to 5.5 Volt Operation

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EXEL Microelectronics, Inc.
XL9020
2,048-Bit Serial Electrically Erasable PROM
2.7 to 5.5 Volt Operation
FEATURES
• 1 MHz Clock Rate
• Extended Temperature Range: -40°C to +85°C
• Low Power Consumption
— Active current 1.5 mA
— Standby current 2µA
• 2.7 to 5.5 volt operation (both READ and
WRITE)
• 4-Wire Bus Interface
• Hardware & Software Write Protection
— Defaults to disabled state at power up
— Software instructions for WRITE-enable/
disable
• Internally Organized as 128 x 16 bits
• Versatile, Easy-to-Use Interface
— READY/BUSY status signal
— Automatic write cycle time-out
• Advanced CMOS E2PROM Technology
• High Reliability
— Endurance: 100,000 cycles per byte
— Data retention: 100 years
• 8-Pin PDIP or SOIC Packages
PIN CONFIGURATIONS
Plastic Dual-in-line
“P” Package
CS 1
SK 2
DI 3
DO 4
8 VCC
7 R/B
6 WC
5 GND
EIAJ Small Outline
“F” Package
R/B 1
VCC 2
CS 3
SK 4
8 WC
7 GND
6 DO
5 DI
D0018 ILL A01.2
CS
SK
DI
DO
GND
WC
R/B
VCC
PIN NAMES
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Write Control
READY/BUSY Output
Power Supply
OVERVIEW
The XL9020 is a cost effective 2,048-bit, nonvolatile,
serial E2PROM designed to directly connect with serial
interface. It is fabricated using EXEL's advanced CMOS
E2PROM technology. The XL9020 provides external
read/write memory arranged as 128 registers of 16 bits
each. Four 8-bit instructions control the operation of the
device, which include read, write, write enable and write
disable. The READY/BUSY pin indicates the status of the
device when polled during the WRITE operation. The data
output pin (DO) also indicates the status of the device
during self-timed nonvolatile programming cycle. To pro-
tect against inadvertent writes, the WRITE instruction is
accepted only while the chip is in the write enabled state.
After the initiation of the write cycle, if Chip Select (CS) is
brought into LOW state, while SK is low, the DO pin will
indicate the READY/BUSY status of the chip.
EXEL Microelectronics, Inc.
2150 Commerce Drive • San Jose, CA 95131
Phone 408 432-0500 • Fax 408 432-8710 • Internet www.exel.com
D0018 5/96
DVPTD 6931-05




ETC

XL9020 Datasheet Preview

XL9020 Datasheet

2/048-Bit Serial Electrically Erasable PROM 2.7 to 5.5 Volt Operation

No Preview Available !

XL9020
BLOCK DIAGRAM
DI INSTRUCTION
REGISTER
CS
WC
SK
INSTRUCTION
DECODE,
CONTROL
AND
CLOCK
GENERATION
DATA
REGISTER
R/W
AMPS
ADDRESS
REGISTER
ADDRESS
DECODER
LOW VCC
DETECTOR
WRITE
ENABLE
HIGH VOLTAGE
GENERATOR
DO
E2 PROM
ARRAY
(128 X 16)
R/B
D0018 ILL B01.1
APPLICATIONS
The XL9020 is ideal for high volume applications requiring
low power and low density data storage. It uses a cost-
effective, space saving 8-pin package, and readily inter-
faces with standard microprocessors and popular
microcontrollers.
end. For a WRITE operation, a 16 bit data field is required
following the 8 bit address field. The device requires an
active LOW CS in order to be selected. Each instruction
must be preceded by a HIGH-to-LOW transition of CS
before the 4 bit start sequence is given. Prior to the 4 bit
start sequence (1010), inputs of all other logical sequence
are ignored.
Candidate applications include alarm devices, air condi-
tioners, TV’s, VCRs, cameras, computer terminals, smart
cards, electronic locks, meters, robotics and telephones,
to name just a few.
During the self-timed internal programming cycle that
accompanies a write, the SK clock is deactivated. It is
needed only when instructions or data are being passed
to or from the memory.
ENDURANCE AND DATA RETENTION
The XL9020 is designed for applications requiring up to
100,000 write cycles per bit. It provides 100 years of
secure data retention, with or without power applied.
Any of the four modes (read, write, write enable, write
disable) may be specified. The write time is set by internal
timer, and determination of whether a write operation is in
progress or not can be made from the status of the
READY/BUSY pin.
DEVICE OPERATION
The XL9020 is a clocked serial port compatible E2PROM.
It operates on a single power supply ranging from 2.7V to
5.5V and it has an on-chip voltage generator to provide
the high voltage needed during a programming operation.
Input data is latched on the rising edge of the clock(SK),
and data is output on the falling edge of the clock.
Data is grouped in 8-bit bytes. The beginning 8 bits specify
the mode, the next 8 bits specify the address, and subse-
quent 16 bits specify the I/O data. Each instruction sent to
the device includes a 4 bit start sequence, 1010, a 4 bit
opcode and an 8 bit address including a dummy bit at the
Read (READ)
The read instruction is the only instruction that outputs
serial data on the DO pin. After the read instruction and
address have been decoded, data is transferred from the
selected memory register into the output register. The
output on DO changes during the HIGH to LOW transition
of SK.
Write (WRITE)
After a write instruction and its address have been de-
coded, the device expects 16 bits of data. These are to be
transferred into the specific memory register which has
previously been automatically erased. After the last data
bit has been clocked into DI on the 32nd clock edge, the
D0018 5/96
DVPTD 6931-05
2


Part Number XL9020
Description 2/048-Bit Serial Electrically Erasable PROM 2.7 to 5.5 Volt Operation
Maker ETC
Total Page 12 Pages
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