August 1996
NM93CS06L/CS46L/CS56L/CS66L
256-/1024-/2048-/4096-Bit Serial EEPROM
with Extended Voltage (2.7V to 5.5V) and Data Protect
(MICROWIRETM Bus Interface)
memory and 5 which operate on the Protect Register. The
General Description
The NM93CS06L/CS46L/CS56L/CS66L devices are
256/1024/2048/4096 bits, respectively, of non-volatile
ter instructions are PRREAD, PRWRITE, PRCLEAR,
memory instructions are READ, WRITE, WRITE ALL,
WRITE ENABLE, and WRITE DISABLE. The Protect regis-
electrically erasable memory divided into 16/64/128/256 x
16-bit registers (addresses). The NM93CSxxL Family func-
PRDISABLE and PRENABLE.
tions in an extended voltage operating range, and is fabri-
cated using National Semiconductor’s floating gate CMOS
Features
Y
Sequential register read
technology for high reliability, high endurance and low pow-
s
Y
Write protection in a user defined section of memory
s
s
s
er consumption. N registers (N 16, N 64, N 128, N
Y
Y
2.7V to 5.5V operating range in all modes
Typical active current of 200 mA; typical standby
current of 1 mA
256) can be protected against data modification by pro-
gramming the Protect Register with the address of the first
register to be protected against data modification. (All regis-
ters greater than, or equal to, the selected address are then
protected from further change.) Additionally, this address
can be ‘‘locked’’ into the device, making all future attempts
to change data impossible.
Y
Y
Y
Y
Y
Y
Y
Y
No erase required before write
Reliable CMOS floating gate technology
MICROWIRE compatible serial I/O
Self timed write cycle
These devices are available in both SO and TSSOP pack-
ages for small space considerations.
Device status during programming mode
40 year data retention
6
Endurance: 10 data changes
The serial interface that controls these EEPROMs is
MICROWIRE compatible, providing simple interfacing to
standard microcontrollers and microprocessors. There
are a total of 10 instructions, 5 which operate on the EEPROM
Packages Available: 8-pin SO, 8-pin DIP, and 8-pin
TSSOP
Block Diagram
TL/D/10044–1
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
MICROWIRETM is a trademark of National Semiconductor Corporation.
C
1996 National Semiconductor Corporation
TL/D/10044
RRD-B30M126/Printed in U. S. A.
http://www.national.com