1996 Microchip Technology Inc.

Preliminary

DS21158B-page 1

FEATURES

• SPI modes 0,0 and 1,1
• 3.0 MHz Clock Rate
• Single supply with Programming Operation down
to 2.5V
• Low Power CMOS Technology
- Max Write Current: 5.0 mA
- Read Current: 1 mA at 5.5V, 3 Mhz
- Standby Current: 1

m

A typical
• 4096 x 8 Organization
• 32-Byte Page
• Sequential Read
• 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
• High Reliability
- Endurance: 1M cycles (guaranteed)
- Data Retention: >200 years
- ESD protection: >4000V
• 8-pin PDIP/SOIC, 14-pin TSSOP
• Temperature ranges supported

DESCRIPTION

The Microchip Technology Inc. 25LC320 is a 32K-bit
serial Electrically Erasable PROM (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, allowing any
number of devices to share the same bus.
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 exception of chip select, allowing the host
to service higher priority interrupts. Also write opera-
tions to the Status Register can be disabled via the
write protect pin (WP).
- Commercial (C): 0



C to +70



C
- Industrial (I): -40



C to +85



C

PACKAGE TYPES
BLOCK DIAGRAM
DIP/SOIC
25LC320
CS
SO
WP
VSS
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
25LC320 14
13
12
11
10
9
8
VCC
HOLD
NC
NC
NC
SCK
SI
1
2
3
4
5
6
7
CS
SO
NC
NC
NC
WP
VSS
TSSOP
SI
SO
SCK
CS
HOLD
WP
Status
Register
I/O Control
Memory
Control
Logic
X
Dec
HV Generator
EEPROM
Array
Page Latches
Y Decoder
Sense Amp.
R/W Control
Logic
Vcc
Vss

25LC320

32K 2.5V SPI



Bus Serial EEPROM

SPI is a trademark of Motorola.

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