Features
• 16-Kbit Serial EEPROM:
- 2,048 x 8 bit organization
- Page size of 32 bytes
- Byte or sequential reads
- Byte or page writes
- Self-timed write cycle (4 ms maximum)
• Backward Compatible with 25AA160D/25LC160D
and AT25160B Serial EEPROMs
• Security Register:
- Preprogrammed 128-bit serial number
- 32-byte user-programmable, lockable ID
page
• Built-in Error Correction Code (ECC) Logic:
- ECC Status bit via the STATUS register
• Programmable Undervoltage Lockout Detection
• JEDEC® SPI Manufacturer Read ID Support
• High-Speed Clock Frequency:
- 20MHz at VCC ≥ 4.5V
- 10MHz at VCC ≥ 2.5V
- 5 MHz at VCC ≥ 1.7V
• 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
• Low-Power CMOS Technology:
- Voltage range: 1.7V to 5.5V
- Write current: 3.0 mA at 5.5V
- Read current: 3.0 mA at 4.5V, 10 MHz
- Standby current: 1.0 μA at 5.5V (I-Temp.)
• High Reliability:
- More than four million erase/write cycles
- Built-in ECC logic for increased reliability
- Data retention: > 200 years
- ESD protection: > 4000V
• Temperature Ranges:
- Industrial (I): -40°C to +85°C
- Extended (E): -40°C to +125°C
- Extended (H): -40°C to +150°C

General Description
The Microchip Technology Inc. 25CS160 provides
16 Kbits of Serial EEPROM utilizing the Serial
Peripheral Interface (SPI) compatible bus. The device
is organized as 2,048 bytes of 8 bits each (2-Kbyte) and
is optimized for use in consumer and industrial
applications where reliable and dependable nonvolatile
memory storage is essential. The 25CS160 is capable
of operation across a broad voltage range (1.7V to
5.5V).
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. 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.
The 25CS160 features a nonvolatile Security register
independent of the 16-Kbit main memory array. The
first half of the Security register is read-only and
contains a factory-programmed, globally unique,
128-bit serial number in the first 16 bytes. The 128-bit
serial number is unique across the entire CS series of
Serial EEPROM products and eliminates the
time-consuming step of performing and ensuring
serialization of a product on a manufacturing line.
The 128-bit read-only serial number is followed by an
additional 32 bytes of user-programmable EEPROM.
The user-programmable section of the Security
register can later be permanently write-protected via a
software sequence.
To protect against brown-out events, an undervoltage
lockout detection circuit inhibits all write sequences
when VCC supply voltage drops below the set voltage
level. The voltage level is configurable via the
Undervoltage Lockout Detection (UVLO) register.
For added reliability, the 25CS160 utilizes a built-in
Error Correction Code (ECC) scheme. This scheme
can correct up to one incorrectly read bit within a
one-byte readout. Additionally, the 25CS160 includes a
flag in the STATUS register to report if any errors were
detected and corrected in the most recent memory
array read sequence.
The 25CS160 features an Identification register that
contains identification information that can be read
from the device. This enables the application to
electronically query and identify the 25CS160 while it is
in the system. The identification method and the
instruction opcode comply with the JEDEC® standard
for “Manufacturer and Device ID Read Methodology for
SPI Compatible Serial Interface Memory Devices”.
The type of information that can be read from the
device includes the JEDEC®-defined Manufacturer ID,
the vendor-specific Device ID and the vendor-specific
Extended Device Information (EDI).