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