 2003 Microchip Technology Inc. DS21807B-page 1
25AA160A/B, 25LC160A/B
Device Selection Table
Features
Max. clock 10 MHz
Low-power CMOS technology
2048 x 8-bit organization
16 byte page (‘A’ version devices)
32 byte page (‘B’ version devices)
Write cycle time: 5 ms max.
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: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
Temperature ranges supported;
Pin Function Table
Description
The Microchip Technology Inc. 25AA160A/B,
25LC160A/B (25XX160A/B
*
) are 16 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 25XX160A/B is available in standard packages
including 8-lead PDIP and SOIC, and advanced
packaging including 8-lead MSOP, and 8-lead TSSOP.
Pb-free (Pure Matte Sn) finish is also available.
Package Types (not to scale)
Part Number VCC Range Page Size Temp. Ranges Packages
25LC160A 2.5-5.5V 16 Byte I,E P, SN, ST, MS
25AA160A 1.8-5.5V 16 Byte I P, SN, ST, MS
25LC160B 2.5-5.5V 32 Byte I,E P, SN, ST, MS
25AA160B 1.8-5.5V 32 Byte I P, SN, ST, MS
- Industrial (I): -40°Cto +85°C
- Automotive (E): -40°C to +125°C
Name Function
CS Chip Select Input
SO Serial Data Output
WP Write-Protect
VSS Ground
SI Serial Data Input
SCK Serial Clock Input
HOLD Hold Input
VCC Supply Voltage
CS
SO
WP
VSS
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
PDIP/SOIC
(P, SN)
TSSOP/MSOP
CS
SO
WP
VSS
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
(ST, MS)
16K SPI
™
Bus Serial EEPROM
*25XX160A/B is used in this document as a generic part
number for the 25AA160A/B, 25LC160A/B devices.
SPI is a registered trademark of Motorola Semiconductor.