Replaces X25328/X25329
X5328/X5329
CPU Supervisor with 32Kbit SPI EEPROM
FEATURES
DESCRIPTION
• Low V detection and reset assertion
These devices combine three popular functions, Power-
on Reset Control, Supply Voltage Supervision, and
Block Lock Protect Serial EEPROM Memory in one
package. This combination lowers system cost, reduces
board space requirements, and increases reliability.
CC
—Five standard reset threshold voltages
—Re-program low V reset threshold voltage
CC
using special programming sequence
—Reset signal valid to V = 1V
CC
• Long battery life with low power consumption
—<50µA max standby current, watchdog on
—<1µA max standby current, watchdog off
—<400µA max active current during read
• 32Kbits of EEPROM
Applying power to the device activates the power on
reset circuit which holds RESET/RESET active for a
period of time. This allows the power supply and oscilla-
tor to stabilize before the processor can execute code.
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2 or all of EEPROM array with
Block Lock™ protection
—In circuit programmable ROM mode
• 2MHz SPI interface modes (0,0 & 1,1)
• Minimize EEPROM programming time
—32-byte page write mode
The device’s low V
user’s system from low voltage conditions by holding
RESET/RESET active when V falls below a mini-
detection circuitry protects the
CC
CC
mum V
until V
trip point. RESET/RESET remains asserted
returns to proper operating level and stabi-
CC
CC
lizes. Five industry standard V
thresholds are
TRIP
available, however, Xicor’s unique circuits allow the
threshold to be reprogrammed to meet custom
requirements or to fine-tune the threshold in applica-
tions requiring higher precision.
—Self-timed write cycle
—5ms write cycle time (typical)
• 2.7V to 5.5V and 4.5V to 5.5V power supply
operation
• Available packages
—14-lead TSSOP, 8-lead SOIC
BLOCK DIAGRAM
WP
Protect Logic
SI
Data
Status
Register
Register
SO
Command
Decode &
Control
SCK
CS
8Kbits
8Kbits
Logic
16Kbits
Reset
Timebase
RESET/RESET
Power on and
Low Voltage
Reset
V
+
-
CC
Generation
X5328 = RESET
X5329 = RESET
V
TRIP
Characteristics subject to change without notice. 1 of 21
REV 1.1.1 3/6/01
www.xicor.com