© 2009 Microchip Technology Inc. DS21828F-page 1
25AA320A/25LC320A
Device Selection Table
Features:
• Max. Clock 10 MHz
• Low-Power CMOS Technology
- Max. Write Current: 5 mA at 5.5V, 10 MHz
- Read Current: 5 mA at 5.5V, 10 MHz
- Standby Current: 5 μA at 5.5V
• 4096 x 8-bit Organization
• 32-Byte Page
• Self-Timed Erase and Write Cycles (5 ms max.)
• Block Write Protection
- Protect none, 1/4, 1/2 or all of array
• Built-in Write Protection
- Power-on/off data protection circuitry
- Write enable latch
- Write-protect pin
• Sequential Read
• High Reliability
- Endurance: >1M erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• Temperature Ranges Supported;
• Pb-Free and RoHS Compliant
Description:
The Microchip Technology Inc. 25AA320A/25LC320A
(25XX320A
*
) are 32 kbit Serial Electrically Erasable
PROMs. The memory is accessed via a simple Serial
Peripheral Interface (SPI) compatible serial bus. The
bus signals required are a clock input (SCK) plus sep-
arate data in (SI) and data out (SO) lines. Access to the
device is controlled through a Chip Select (CS
) input.
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused, transi-
tions on its inputs will be ignored, with the exception of
Chip Select, allowing the host to service higher priority
interrupts.
The 25XX320A is available in standard packages
including 8-lead PDIP and SOIC, and advanced
packaging including 8-lead MSOP, TSSOP and 2x3
TDFN.
Package Types (not to scale)
Part Number VCC Range Page Size Temp. Ranges Packages
25LC320A 2.5-5.5V 32 Byte I,E P, SN, ST, MS, MNY
25AA320A 1.8-5.5V 32 Byte I P, SN, ST, MS, MNY
- Industrial (I): -40°Cto +85°C
- Automotive (E): -40°C to +125°C
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
PDIP/SOIC
(P, SN)
TSSOP/MSOP
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
(ST, MS)
TDFN
CS
SO
WP
VSS
HOLD
SCK
SI
5
6
7
8
4
3
2
1
VCC
(MNY)
X-Rotated TSSOP
HOLD
V
CC
CS
SO
1
2
3
4
8
7
6
5
SCK
SI
V
SS
WP
(X/ST)
32K SPI Bus Serial EEPROM
*25XX320A is used in this document as a generic part number
for the 25AA320A, 25LC320A devices.
