25AA040A/25LC040A
4K SPI™ Bus Serial EEPROM
Device Selection Table
Part Number
VCC Range
Page Size
Temp. Ranges
Packages
25AA040A
25LC040A
1.8-5.5V
2.5-5.5V
16 Bytes
16 Bytes
I
P, MS, SN, ST
P, MS, SN, ST
I, E
Features
Description
• Max. clock 10 MHz
The Microchip Technology Inc. 25XX040A* is a 4k-bit
Serial Electrically Erasable Programmable Read-Only
Memory (EEPROM). 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.
• Low-power CMOS technology
- Max Write Current: 5 mA at 5.5V, 10MHz
- Read Current: 5 mA at 5.5V, 10MHz
- Standby Current 5 µA at 5.5V
• 512 x 8-bit organization
• Write Page mode (up to 16 bytes)
• Sequential Read
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.
• 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
The 25XX040A is available in standard packages
including 8-lead PDIP and SOIC, and advanced
packages including 8-lead MSOP, 8-lead TSSOP
and rotated TSSOP. Pb-free (Pure Matte Sn) finish is
also available.
- Power-on/off data protection circuitry
- Write enable latch
- Write-protect pin
• High reliability
Package Types (not to scale)
- Endurance: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• Temperature ranges supported;
- Industrial (I):
- Automotive (E):
PDIP/SOIC
(P, SN)
TSSOP/MSOP
(ST, MS)
CS
SO
WP
VCC
1
2
3
4
8
7
6
5
1
2
3
4
8
7
6
5
CS
SO
WP
V
CC
HOLD
SCK
SI
HOLD
SCK
SI
-40°C to +85°C
-40°C to +125°C
VSS
VSS
• Standard and Pb-free packages available
X-Rotated TSSOP
(X/ST)
Pin Function Table
Name
Function
Chip Select Input
1
2
3
4
8
7
6
5
HOLD
SCK
SI
VSS
WP
VCC
CS
SO
CS
SO
Serial Data Output
Write-Protect
Ground
SPI is a registered trademark of Motorola Corporation.
WP
VSS
SI
Serial Data Input
Serial Clock Input
Hold Input
SCK
HOLD
VCC
*25XX040A is used in this document as a generic part number for the
25AA040A and the 25LC040A.
Supply Voltage
2003 Microchip Technology Inc.
Preliminary
DS21827B-page 1