25AA1024-I/ST Microchip Technology, 25AA1024-I/ST Datasheet - Page 14

• Manufacturer Part Number: 25AA1024-I/ST
• Description: IC, EEPROM, 1MBIT, SERIAL, 20MHZ TSSOP-8
• Manufacturer: Microchip Technology

Specifications of 25AA1024-I/ST

• Memory Size: 1Mbit
• Ic Interface Type: SPI
• Clock Frequency: 20MHz
• Supply Voltage Range: 1.8V To 5.5V
• Memory Case Style: TSSOP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +85°C

25AA1024
2.6
The following protection has been implemented to
prevent inadvertent writes to the array:
• The write enable latch is reset on power-up
• A write enable instruction must be issued to set
• After a byte write, page write or STATUS register
• CS must be set high after the proper number of
• Access to the array during an internal write cycle
TABLE 2-4:
DS21836G-page 14
x = don’t care
the write enable latch
write, the write enable latch is reset
clock cycles to start an internal write cycle
is ignored and programming is continued
(SR bit 1)
WEL
0
1
1
1
Data Protection
WRITE-PROTECT FUNCTIONALITY MATRIX
(SR bit 7)
WPEN
x
0
1
1
1 (high)
0 (low)
(pin 3)
WP
x
x
Protected Blocks
Protected
Protected
Protected
Protected
2.7
The 25AA1024 powers on in the following state:
• The device is in low-power Standby mode
• The write enable latch is reset
• SO is in high-impedance state
• A high-to-low-level transition on CS is required to
(CS = 1)
enter active state
Unprotected Blocks
Power-On State
Protected
Writable
Writable
Writable
 2010 Microchip Technology Inc.
STATUS Register
Protected
Protected
Writable
Writable