2007 Microchip Technology Inc.
DS21828D-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
μ
A 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;
- Industrial (I):
- Automotive (E):
Standard and Pb-free packages available
Pin Function Table
Description:
The Microchip Technology Inc. 25AA320A/25LC320A
(25XX320A
*
) are 32k-bit 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, and 8-lead TSSOP.
All packages are Pb-free.
Package Types (not to scale)
Part Number
V
CC
Range
Page Size
Temp. Ranges
Packages
25LC320A
25AA320A
2.5-5.5V
1.8-5.5V
32 Byte
32 Byte
I,E
I
P, SN, ST, MS
P, SN, ST, MS
-40
°
C to
-40°C to +125°C
+85
°
C
Name
Function
CS
Chip Select Input
SO
Serial Data Output
WP
Write-Protect
V
SS
Ground
SI
Serial Data Input
SCK
Serial Clock Input
HOLD
Hold Input
V
CC
Supply Voltage
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
PDIP/SOIC
(P, SN)
TSSOP/MSOP
(ST, MS)
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
HOLD
SCK
SI
32K SPI Bus Serial EEPROM
*25XX320A
is used in this document as a generic part number
for the 25AA320A, 25LC320A devices.