Preliminary
CAT33C804A
4K-Bit Secure Access Serial E2PROM
FEATURES
■ Single 3V Supply
■ 100,000 Program/Erase Cycles
■ Password READ/WRITE Protection: 1 to 8 Bytes
■ Memory Pointer WRITE Protection
■ Sequential READ Operation
■ I/O Speed: 9600 Baud
–Clock Frequency: 4.9152 MHz Xtal
■ Low Power Consumption:
–Active: 3 mA
■ 256 x 16 or 512 x 8 Selectable Serial Memory
■ UART Compatible Asynchronous Protocol
–Standby: 250 µA
■ 100 Year Data Retention
■ Commercial, Industrial and Automotive
Temperature Ranges
DESCRIPTION
The CAT33C804A 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
CAT33C804A uses a UART compatible asynchronous
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)
V
1
2
3
4
8
7
6
5
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CC
CS
CLK
DI
V
NC
NC
CS
CLK
DI
NC
NC
V
CC
GND
PE
64-BIT ACCESS CODE
ERR
GND
&
CC
CONTROL BLOCK
DO
PE
DO
ERR
GND
NC
SERIAL
CLK
DO
NC
NC
COMMUNI-
CATION
BLOCK
PE
CS
DI
4K-BIT EEPROM
ARRAY
NC
PIN FUNCTIONS
5074 FHD F01
R/W
ADDRESS
Pin Name
Function
BUFFER
DECODER
INSTRUCTION
REGISTER
CS
Chip Select
DO(1)
CLK
DI(1)
PE
Serial Data Output
Clock Input
INSTRUCTION
DECODER
ADDRESS
REGISTER
ERR
Serial Data Input
Parity Enable
STATUS
REGISTER
MEMORY
POINTER
ERR
VCC
GND
Error Indication Pin
+3V Power Supply
Ground
33C804 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. 25044-00 2/98
1