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93LC86C-I/MS Datasheet(PDF) 5 Page - Microchip Technology

Part # 93LC86C-I/MS
Description  16K Microwire Compatible Serial EEPROM
Download  26 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

93LC86C-I/MS Datasheet(HTML) 5 Page - Microchip Technology

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 2004 Microchip Technology Inc.
DS21797D-page 5
93AA86A/B/C, 93LC86A/B/C, 93C86A/B/C
2.0
FUNCTIONAL DESCRIPTION
When the ORG* pin is connected to VCC, the (x16)
organization is selected. When it is connected to
ground, the (x8) organization is selected. Instructions,
addresses and write data are clocked into the DI pin on
the rising edge of the clock (CLK). The DO pin is
normally held in a HIGH-Z state except when reading
data from the device, or when checking the READY/
BUSY status during a programming operation. The
READY/BUSY status can be verified during an Erase/
Write operation by polling the DO pin; DO low indicates
that programming is still in progress, while DO high
indicates the device is ready. DO will enter the HIGH-Z
state on the falling edge of CS.
2.1
Start Condition
The Start bit is detected by the device if CS and DI are
both high with respect to the positive edge of CLK for
the first time.
Before a Start condition is detected, CS, CLK, and DI
may change in any combination (except to that of a
Start condition), without resulting in any device
operation (READ, WRITE, ERASE, EWEN, EWDS,
ERAL or WRAL). As soon as CS is high, the device is
no longer in Standby mode.
An instruction following a Start condition will only be
executed if the required opcode, address and data bits
for any particular instruction are clocked in.
2.2
Data In/Data Out (DI/DO)
It is possible to connect the Data In and Data Out pins
together. However, with this configuration it is possible
for a “bus conflict” to occur during the “dummy zero”
that precedes the read operation, if A0 is a logic high
level. Under such a condition the voltage level seen at
Data Out is undefined and will depend upon the relative
impedances of Data Out and the signal source driving
A0. The higher the current sourcing capability of the
driver, the higher the voltage at the Data Out pin. In
order to limit this current, a resistor should be con-
nected between DI and DO.
2.3
Data Protection
All modes of operation are inhibited when VCC is below
a typical voltage of 1.5V for ‘93AA’ and ‘93LC’ devices
or 3.8V for ‘93C’ devices.
The EWEN and EWDS commands give additional
protection against accidentally programming during
normal operation.
Note:
For added protection, an EWDS command
should be performed after every write
operation.
After power-up, the device is automatically in the
EWDS mode. Therefore, an EWEN instruction must be
performed before the initial ERASE or WRITE instruction
can be executed.
Block Diagram
Memory
Array
Data Register
Mode
Decode
Logic
Clock
Register
Address
Decoder
Address
Counter
Output
Buffer
DO
DI
ORG*
CS
CLK
VCC
VSS
*ORG and PE inputs are not available on
PE*
A/B devices.


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