 2004 Microchip Technology Inc. DS21227E-page 1
25AA320/25LC320/25C320
Device Selection Table
Features:
• 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
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:
- Power on/off data protection circuitry
- Write enable latch
- Write-protect pin
Sequential read
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:
Description:
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.
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
Package Types
Part
Number
VCC
Range
Max. Clock
Frequency
Temp.
Ranges
25AA320 1.8-5.5V 1 MHz I
25LC320 2.5-5.5V 2 MHz I,E
25C320 4.5-5.5V 3 MHz I,E
- Industrial (I): -40°Cto +85°C
- Automotive (E): -40°C to +125°C
SI
SO
SCK
CS
HOLD
WP
Status
Register
I/O Control
Memory
Control
Logic
HV Generator
EEPROM
Array
Page
Y Decoder
Sense Amp.
R/W Control
Logic
VCC
VSS
Latches
XDEC
TSSOP
PDIP, SOIC
TSSOP
CS
SO
WP
VSS
VCC
HOLD
SCK
SI
1
2
3
4
8
7
6
5
25X
X320
HOLD
VCC
CS
SO
1
2
3
4
8
7
6
5
SCK
SI
VSS
WP
25X
X320
NC
CS
SO
NC
WP
VSS
NC
NC
VCC
HOLD
NC
SCK
SI
NC
25XX
320
1
2
3
4
14
13
12
11
510
9
78
6
32K SPI
™
Bus Serial EEPROM
*25XX320 is used in this document as a generic part number for the 25AA320/25LC320/25C320 devices.