Document
Preliminary
CAT35C704
4K-Bit Secure Access Serial E2PROM FEATURES
s Single 5V Supply s Password READ/WRITE Protection: 1 to 8 Bytes s Memory Pointer WRITE Protection s Sequential READ Operation s 256 x16 or 512 x 8 Selectable Serial Memory s High Speed Synchronous Protocol s Commercial, Industrial and Automotive s Operating Frequency: DC–3MHz s Low Power Consumption:
–Active: 3 mA –Standby: 250 µA
s 100,000 Program/Erase Cycles s 100 Year Data Retention
Temperature Ranges
DESCRIPTION
The CAT35C704 is a 4K-bit Serial E2PROM that safeguards stored data from unauthorized access by use of a user selectable (1 to 8 byte) access code and a movable memory pointer. Two operating modes provide unprotected and password-protected operation allowing the user to configure the device as anything from a ROM to a fully protected no-access memory. The CAT35C704 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
DIP Package (P)
CS CLK DI DO 1 2 3 4 8 7 6 5 VCC PE ERR GND
BLOCK DIAGRAM
SOIC Package (J)
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NC NC VCC PE ERR GND NC NC
5074 FHD F01
NC NC CS CLK DI DO NC NC
VCC GND
64-BIT ACCESS CODE & CONTROL BLOCK SERIAL COMMUNICATION BLOCK
DO CLK PE CS DI
4K-BIT EEPROM ARRAY R/W BUFFER ADDRESS DECODER
PIN FUNCTIONS
Pin Name CS DO(1) CLK DI(1) PE ERR VCC GND Function Chip Select Serial Data Output Clock Input Serial Data Input Parity Enable Error Indication Pin +5V Power Supply Ground
ERR
INSTRUCTION REGISTER INSTRUCTION DECODER ADDRESS REGISTER
STATUS REGISTER
MEMORY POINTER
35C704 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. 25045-00 2/98
1
CAT35C704
Preliminary
ABSOLUTE MAXIMUM RATINGS*
Temperature Under Bias ................. –55°C to +125°C Storage Temperature ....................... –65°C to +150°C Voltage on Any Pin with Respect to Ground(1) ........... –2.0V to +VCC + 2.0V VCC with Respect to Ground ............... –2.0V to +7.0V Package Power Dissipation Capability (Ta = 25°C) ................................... 1.0W Lead Soldering Temperature (10 secs) ............ 300°C Output Short Circuit Current(2) ........................ 100mA RELIABILITY CHARACTERISTICS Symbol NEND(3) TDR
(3)
*COMMENT
Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
Parameter Endurance Data Retention ESD Susceptability Latch-up
Min. 100,000 100 2000 100
Max.
Units Cycles/Byte.