Datasheet

 2003-2012 Microchip Technology Inc. DS21827H-page 1
25AA040A/25LC040A
Device Selection Table
Features:
• Max. Clock 10 MHz
• Low-Power CMOS Technology:
- Max. Write Current: 5 mA at 5.5V, 10 MHz
- Read Current: 5 mA at 5.5V, 10 MHz
- Standby Current: 5 A at 5.5V
• 512 x 8-Bit Organization
• Write Page mode (up to 16 bytes)
• Sequential Read
• 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:
- Power-on/off data protection circuitry
- Write enable latch
- Write-protect pin
• High Reliability:
- Endurance: 1,000,000 Erase/Write cycles
- Data retention: >200 years
- ESD protection: >4000V
• Temperature Ranges Supported:
• Pb-Free and RoHS Compliant
Pin Function Table
Description:
The Microchip Technology Inc. 25XX040A* is a 4 Kbit
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.
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.
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, 8-lead 2x3 DFN and TDFN, and
6-lead SOT-23.
Package Types (not to scale)
Part Number VCC Range Page Size Temp. Ranges Packages
25AA040A 1.8-5.5V 16 Bytes I P, MS, SN, ST, MN, MC, OT
25LC040A 2.5-5.5V 16 Bytes I, E P, MS, SN, ST, MN, MC, OT
- Industrial (I): -40Cto +85C
- Automotive (E): -40Cto+125C
Name Function
CS
Chip Select Input
SO Serial Data Output
WP Write-Protect
V
SS Ground
SI Serial Data Input
SCK Serial Clock Input
HOLD
Hold Input
V
CC Supply Voltage
CS
SO
WP
V SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
PDIP/SOIC
(P, SN)
CS
SO
WP
V SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
CS
SO
WP
V SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
TSSOP/MSOP
(ST, MS)
X-Rotated TSSOP
HOLD
V CC
CS
SO
1
2
3
4
8
7
6
5
SCK
SI
V
SS
WP
(X/ST)
V SS
1
2
3
4
6
5
V
DD
CS
SO
(OT)
SOT-23
SCK
SI
CS
SO
WP
V SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
(MC, MN)
DFN/TDFN
4K SPI Bus Serial EEPROM
*25XX040A is used in this document as a generic part number
for the 25AA040A and the 25LC040A.