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93LC46AB Datasheet(PDF) 6 Page - Microchip Technology

Part No. 93LC46AB
Description  1K 2.5V Microwire Serial EEPROM
Download  12 Pages
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

93LC46AB Datasheet(HTML) 6 Page - Microchip Technology

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93LC46A/B
DS21173E-page 6
 2000 Microchip Technology Inc.
3.6
ERASE/WRITE Disable and Enable
(EWDS/EWEN)
The 93LC46A/B powers up in the ERASE/WRITE Dis-
able (EWDS) state. All programming modes must be
preceded by an ERASE/WRITE Enable (EWEN)
instruction. Once the EWEN instruction is executed,
programming remains enabled until an EWDS instruc-
tion is executed or Vcc is removed from the device. To
protect against accidental data disturbance, the EWDS
instruction can be used to disable all ERASE/WRITE
functions and should follow all programming opera-
tions. Execution of a READ instruction is independent
of both the EWEN and EWDS instructions.
3.7
READ
The READ instruction outputs the serial data of the
addressed memory location on the DO pin. A dummy
zero bit precedes the 8-bit (93LC46A) or 16-bit
(93LC46B) output string. The output data bits will tog-
gle on the rising edge of the CLK and are stable after
the specified time delay (TPD). Sequential read is pos-
sible when CS is held high. The memory data will auto-
matically cycle to the next register and output
sequentially.
FIGURE 3-4:
EWDS TIMING
FIGURE 3-5:
EWEN TIMING
FIGURE 3-6:
READ TIMING
CS
CLK
DI
10
00
0
X
•••
X
TCSL
1X
CS
CLK
DI
00
1
1
X
TCSL
•••
CS
CLK
DI
DO
11
0
An
•••
A0
HIGH-Z
0Dx
•••
D0
Dx
•••
D0
•••
Dx
D0


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