25C080/160
8K/16K 5.0V SPI Bus Serial EEPROM
FEATURES
PACKAGE TYPES
• SPI modes 0,0 and 1,1
• 3 MHz Clock Rate
• Single 5V supply
PDIP
CS
SO
1
2
8
7
VCC
• Low Power CMOS Technology
- Max Write Current: 5 mA
- Read Current: 1.0 mA
- Standby Current: 1 µA typical
• Organization
HOLD
WP
VSS
3
4
6
5
SCK
SI
- 1024 x 8 for 25C080
- 2048 x 8 for 25C160
• 16 Byte Page
• Self-timed ERASE and WRITE Cycles
• Sequential Read
• Block Write Protection
- Protect none, 1/4, 1/2, or all of Array
• Built-in Write Protection
- Power On/Off Data Protection Circuitry
- Write Latch
SOIC
1
2
8
7
CS
SO
VCC
HOLD
- Write Protect Pin
• High Reliability
3
4
6
5
WP
VSS
SCK
SI
- Endurance: 10M cycles (guaranteed)
- Data Retention: >200 years
- ESD protection: >4000 V
• 8-pin PDIP/SOIC Packages
• Temperature ranges supported
- Commercial (C):
- Industrial (I):
- Automotive (E):
0°C to +70°C
-40°C to +85°C
-40˚C to +125˚C
BLOCK DIAGRAM
Status
Register
HV Generator
DESCRIPTION
The Microchip Technology Inc. 25C080/160 are 8K and
16K bit Serial Electrically Erasable PROMs. The mem-
ory 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, allowing any number
of devices to share the same bus.
EEPROM
Array
Memory
Control
Logic
X
I/O Control
Logic
Dec
Page Latches
Y Decoder
WP
SI
There are two other inputs that provide the end user
with additional flexibility. Communication to the device
can be paused via the hold pin (HOLD). 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. Also write
operations to the Status Register can be disabled via
the write protect pin (WP).
SO
CS
SCK
HOLD
Sense Amp.
R/W Control
Vcc
Vss
SPI is a trademark of Motorola.
1996 Microchip Technology Inc.
Preliminary
DS21147F-page 1
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