Not recommended for new designs –
Please use 25AA320A or 25LC320A.
25AA320/25LC320/25C320
32K SPI Bus Serial EEPROM
Description:
Device Selection Table
Part
Number
VCC
Range
Max. Clock
Frequency
Temp.
Ranges
The Microchip Technology Inc. 25AA320/25LC320/
25C320 (25XX320*) 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 separate data in (SI) and data out (SO)
lines. Access to the device is controlled through a Chip
Select (CS) input.
25AA320
25LC320
25C320
1.8-5.5V
2.5-5.5V
4.5-5.5V
1 MHz
2 MHz
3 MHz
I
I,E
I,E
Features:
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused,
transitions on its inputs will be ignored, with the
exception of Chip Select, allowing the host to service
higher priority interrupts.
• Low-Power CMOS Technology:
- Write current: 3 mA maximum
- Read current: 500 μA, typical
- Standby current: 500 nA, typical
• 4096 x 8 Bit Organization
• 32 Byte Page
Block Diagram
• Write Cycle Time: 5 ms Maximum
• Self-Timed Erase and Write Cycles
• Block Write Protection:
STATUS
HV Generator
Register
- Protect none, 1/4, 1/2 or all of array
• Built-in Write Protection:
- Power on/off data protection circuitry
- Write enable latch
EEPROM
Memory
I/O Control
Logic
Array
Control
Logic
XDEC
- Write-protect pin
• Sequential Read
Page
Latches
• High Reliability:
- Endurance: 1M E/W cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• 8-Pin PDIP, SOIC and TSSOP Packages
• 14-Lead TSSOP Package
• Temperature Ranges Supported:
SI
Y Decoder
SO
CS
SCK
Sense Amp.
R/W Control
HOLD
WP
- Industrial (I):
-40°C to +85°C
VCC
VSS
- Automotive (E):
-40°C to +125°C
Package Types
PDIP, SOIC
TSSOP
TSSOP
1
2
3
4
5
6
7
14
13
12
11
10
9
VCC
CS
SO
CS
1
8
VCC
1
8
7
6
5
HOLD
VCC
SCK
SI
HOLD
NC
NC
2
3
4
SO
2
3
7
6
HOLD
SCK
NC
NC
NC
WP
WP
CS
SO
VSS
WP
NC
SCK
SI
VSS
4
5
SI
8
VSS
*25XX320 is used in this document as a generic part number for the 25AA320/25LC320/25C320 devices.
© 2008 Microchip Technology Inc.
DS21227F-page 1