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AM93LC66IGS Folha de dados(PDF) 4 Page - Anachip Corp

Nome de Peças AM93LC66IGS
Descrição Electrónicos  4096-bits Serial Electrically Erasable PROM
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4096-bits Serial Electrically Erasable PROM
AM93LC66
Anachip Corp.
www.anachip.com.tw
Rev. A1 Oct 20, 2003
4/10
ATC
Pin Capacitance ** (Ta=25°C , f=1MHz )
Symbol
Parameter
Max
Units
COUT
Output capacitance
5
pF
CIN
Input capacitance
5
pF
Note ** :The parameter is characterized and isn’t 100% tested.
Functional Descriptions
Applications
The AM93LC66 is ideal for high volume applications
requiring low power and low density storage. This
device uses a low cost, space saving 8-pin package.
Typical applications include robotics, alarm devices,
electronic locks, meters and instrumentation settings
such as LAN cards, monitors and MODEM.
Endurance and Data Retention
The AM93LC66 is designed for applications
requiring up to 1M programming cycles (WRITE,
WRALL, EARSE and ERALL). It provides 40 years
of secure data retention.
Device Operation
The AM93LC66 is controlled by seven 11-bit
instructions. Instructions are clocked in (serially) on
the DI pin. Each instruction begins with a logical "1"
(the start bit). This is followed by the opcode (2 bits),
the address field (8 bits), and data, if appropriate.
The clock signal (SK) may be halted at any time and
the AM93LC66 will remain in its last state. This
allows full static flexibility and maximum power
conservation.
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 a
8-bit or 16-bit serial shift register. (Please note that
one logical "0" bit precedes the actual 8-bit or 16-bit
output data string.) The output on DO changes
during the rising edge transitions of SK. (Shown in
Figure 3)
Auto Increment Read Operations
Sequential read is possible, since the AM93LC66
has been designed to output a continuous stream of
memory content in response to a single read
operation instruction. To utilize this function, the
system asserts a read instruction specifying a start
location address. Once the 8-bit or 16-bit of the
addressed word have been clocked out, the data in
consecutively higher address locations is output.
The address will wrap around continuously with CS
high until the chip select (CS) control pin is brought
low. This allows for single instruction data dumps to
be executed with a minimum of firmware overhead.
Write Enable (WEN)
Before any device programming (WRITE, WRALL,
ERASE, and ERAL) can be done, the WRITE
ENABLE (WEN) instruction must be executed first.
When Vcc is applied, this device powers up in the
WRITE DISABLE state. The device then remains in
a WRITE DISABLE state until a WEN instruction is
executed. Thereafter the device remains enabled
until a WDS instruction is executed or until Vcc is
removed. (NOTE: Neither the WEN nor the WDS
instruction has any effect on the READ instruction.)
(Shown in Figure 4)
Write Disable (WDS)
The WRITE DISABLE (WDS) instruction disables all
programming capabilities. This protects the entire
part against accidental modification of data until a
WEN instruction is executed. (When Vcc is applied,
this part powers up in the WRITE DISABLE state.)
To protect data, a WDS instruction should be
executed upon completion of each programming
operation. (NOTE: Neither the WEN nor the WDS
instruction has any effect on the READ instruction.)
(Shown in Figure 5)


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