25AA320 Datasheet, PDF (1/24 Pages) Microchip Technology – 32K SPI Bus Serial EEPROM

25AA320/25LC320/25C320
32K SPI^™ Bus Serial EEPROM
Device Selection Table
Part
Number
25AA320
25LC320
25C320
VCC
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
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:
- Industrial (I):
-40°C to +85°C
- Automotive (E): -40°C to +125°C
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
Status
Register
HV Generator
I/O Control
Logic
Memory
Control
Logic
XDEC
EEPROM
Array
Page
Latches
SI
SO
CS
SCK
HOLD
WP
VCC
VSS
Y Decoder
Sense Amp.
R/W Control
Package Types
PDIP, SOIC
CS 1
SO 2
WP 3
VSS 4
8 VCC
7 HOLD
6 SCK
5 SI
HOLD
VCC
CS
SO
TSSOP
1
8
2
7
3
6
4
5
SCK
SI
VSS
WP
TSSOP
CS ¹
SO 2
NC ³
NC 4
NC ⁵
WP ⁶
VSS ⁷
14 VCC
13 _HOLD
12 _NC
11 NC
10 _NC
9 _SCK
8 _SI
*25XX320 is used in this document as a generic part number for the 25AA320/25LC320/25C320 devices.
 2004 Microchip Technology Inc.
DS21227E-page 1