Datasheet

 2003-2013 Microchip Technology Inc. DS21830F-page 1
25AA640A/25LC640A
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: 1 A at 5.5V
• 8192 x 8-bit Organization
• 32 Byte Page
• 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
• Sequential Read
• High Reliability:
- Endurance: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• Temperature Ranges Supported:
Description:
The Microchip Technology Inc. 25AA640A/25LC640A
(25XX640A
*
) are 64 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, transi-
tions on its inputs will be ignored, with the exception of
Chip Select, allowing the host to service higher priority
interrupts.
The 25XX640A is available in standard packages
including 8-lead PDIP and SOIC, and advanced
packaging including 8-lead MSOP, 8-lead TSSOP, DFN
and TDFN.
Package Types (not to scale)
Part Number VCC Range Page Size Temp. Ranges Packages
25LC640A 2.5-5.5V 32 Byte I,E P, SN, ST, MS, MF, MNY
25AA640A 1.8-5.5V 32 Byte I, E P, SN, ST, MS, MF, MNY
- Industrial (I): -40Cto +85C
- Automotive (E): -40°C to +125°C
CS
SO
WP
V SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
PDIP/SOIC
(P, SN)
TSSOP/MSOP
CS
SO
WP
V SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
(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)
DFN/TDFN
CS
SO
WP
VSS
HOLD
SCK
SI
5
6
7
8
4
3
2
1
VCC
(MF/MNY)
64K SPI Bus Serial EEPROM
* 25XX640A is used in this document as a generic part number
for the 25AA640A, 25LC640A devices.