Preliminary
CAT33C704
4K-Bit Secure Access Serial E2PROM
FEATURES
■ Single 3V Supply
■ Low Power Consumption:
Active: 3 mA
■ Password READ/WRITE Protection: 1 to 8 Bytes
■ Memory Pointer WRITE Protection
■ Sequential READ Operation
Standby: 250 µA
■ 100,000 Program/Erase Cycles
■ 100 Year Data Retention
■ 256 x16 or 512 x 8 Selectable Serial Memory
■ High Speed Synchronous Protocol
■ Operating Frequency: DC–1MHz
■ Commercial, Industrial and Automotive
Temperature Ranges
DESCRIPTION
The CAT33C704 is a 4K-bit Serial E2PROM that safe-
guards stored data from unauthorized access by use of
a user selectable (1 to 8 byte) access code and a
movablememorypointer. Twooperatingmodesprovide
unprotected and password-protected operation allow-
ing the user to configure the device as anything from a
ROM to a fully protected no-access memory. The
CAT33C704 uses a unique serial-byte synchronous
communication protocol and has a Sequential Read
feature where data can be sequentially clocked out of
the memory array. The device is available in 8-pin DIP
or 16-pin SOIC packages.
PIN CONFIGURATION
BLOCK DIAGRAM
DIP Package (P)
SOIC Package (J)
1
2
3
4
8
7
6
5
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CS
CLK
DI
V
NC
NC
CS
CLK
DI
NC
NC
CC
V
CC
PE
GND
64-BIT ACCESS CODE
&
CONTROL BLOCK
ERR
GND
V
CC
PE
DO
ERR
GND
NC
DO
CLK
PE
SERIAL
COMMUNI-
CATION
DO
NC
NC
CS
DI
NC
BLOCK
4K-BIT EEPROM
ARRAY
5074 FHD F01
R/W
BUFFER
ADDRESS
DECODER
PIN FUNCTIONS
INSTRUCTION
REGISTER
Pin Name
Function
CS
Chip Select
INSTRUCTION
DECODER
ADDRESS
REGISTER
ERR
DO(1)
CLK
DI(1)
PE
Serial Data Output
Clock Input
Serial Data Input
Parity Enable
STATUS
REGISTER
MEMORY
POINTER
ERR
VCC
GND
Error Indication Pin
+3V Power Supply
Ground
33C704 F02
Note:
(1) DI, DO may be tied together to form a common I/O.
© 1998 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 25046-00 2/98
1