
 1996 Microchip Technology Inc.
DS21058G-page 1
FEATURES
 Voltage operating range:  4.5V to 5.5V
- Peak write current 3 mA at 5.5V
- Maximum read current 150 
- Standby current 1 
 Industry standard two-wire bus protocol, I
compatible 
 8 byte page, or byte modes available
 2 ms typical write cycle time, byte or page
 64-byte input cache for fast write loads  
 Up to eight devices may be connected to the 
same bus for up to 512K bits total memory
 Including 400 KHz compatibility
 Programmable block security options
 Programmable endurance options
 Schmitt trigger, filtered inputs for noise suppres-
sion
 Output slope control to eliminate ground bounce
 Self-timed ERASE and WRITE cycles
 Power on/off data protection circuitry
 Endurance:
- 10,000,000 E/W cycles guaranteed for High 
Endurance Block
- 100,000 E/W cycles guaranteed for a Stan-
dard Endurance Block
 Electrostatic discharge protection > 4000V
 Data retention > 200 years
 8-pin PDIP/SOIC packages
  Temperature ranges
- Commercial (C):
- Industrial (I)
- Automotive (E):
μ
A at 5.5V
μ
A typical
2
C
DESCRIPTION
The Microchip Technology Inc. 24C65 is a “smart” 8K x
8 Serial Electrically Erasable PROM (EEPROM).    This
device has been developed for advanced, low power
applications such as personal communications, and
provides the systems designer with flexibility through
the use of many new user-programmable features. The
24C65 offers a relocatable 4K bit block of
ultra-high-endurance memory for data that changes
frequently. The remainder of the array, or 60K bits, is
rated at 1,000,000 ERASE/WRITE (E/W) cycles guar-
anteed. The 24C65 features an input cache for fast
write loads with a capacity of eight pages, or 64 bytes.
This device also features programmable security
0
°
°
°
C to
C to
C to +125
+70
+85
°
°
°
C
C
C
-40
-40
options for E/W protection of critical data and/or code of
up to fifteen 4K blocks. Functional address lines allow
the connection of up to eight 24C65's on the same bus
for up to 512K bits contiguous EEPROM memory.
Advanced CMOS technology makes this device ideal
for low-power nonvolatile code and data applications.
The 24C65 is available in the standard 8-pin plastic DIP
and 8-pin surface mount SOIC package.
24C65
 EEPROM
64K 5.0V I
2
C
 Smart Serial
PACKAGE TYPES
BLOCK DIAGRAM
2
A0
A1
A2
V
SS
1
2
3
4
8
7
6
5
V
CC
NC
SCL
SDA
2
A0
A1
A2
V
SS
1
2
3
4
8
7
6
9
V
CC
NC
SCL
SDA
PDIP
SOIC
HV Generator
EEPROM ARRAY
Page Latches
Cache
YDEC
Vcc
Vss
I/O
Control
Logic
Memory
Control
Logic
SCL
SDA
A0..A2
XDEC
Sense AMP 
R/W Control
I/O
I
Smart Serial is a trademark of Microchip Technology Inc.
2
C is a trademark of Philips Corporation.
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