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1. Features
Medium-voltage and Standard-voltage Operation
– 2.7 (VCC = 2.7V to 5.5V)
User-selectable Internal Organization
– 1K: 128 x 8 or 64 x 16
Three-wire Serial Interface
2 MHz Clock Rate (5V)
Self-timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Write Cycles
– Data Retention: 100 Years
8-lead TSSOP and 8-lead JEDEC SOIC Packages
2. Description
The AT93C46 provides 1024 bits of serial electrically erasable programmable read
only memory (EEPROM) organized as 64 words of 16 bits each, when the ORG pin is
connected to VCC and 128 words of 8 bits each when it is tied to ground. The device
is optimized for use in many automotive applications where low power and low voltage
operations are essential. The AT93C46 is available in space-saving 8-lead TSSOP
and 8-lead JEDEC SOIC packages. The AT93C46 is enabled through the Chip Select
pin (CS), and accessed via a 3-wire serial interface consisting of Data Input (DI), Data
Output (DO), and Shift Clock (SK). Upon receiving a Read instruction at DI, the
address is decoded and the data is clocked out serially on the data output pin DO. The
WRITE cycle is completely self-timed and no separate erase cycle is required before
write. The Write cycle is only enabled when it is in the Erase/Write Enable state. When
CS is brought “high” following the initiation of a write cycle, the DO pin outputs the
Ready/Busy status.
Table 2-1.
Pin Name
CS
SK
DI
DO
GND
VCC
ORG
Pin Configuration
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
Internal Organization
8-lead SOIC
CS 1
SK 2
DI 3
DO 4
8 VCC
7 DC
6 ORG
5 GND
8-lead TSSOP
CS 1
SK 2
DI 3
DO 4
8 VCC
7 DC
6 ORG
5 GND
Three-wire
Automotive
Temperature
Serial
EEPROMs
1K (128 x 8 or 64 x 16)
AT93C46
Rev. 5125C–SEEPR–11/07

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3. Absolute Maximum Ratings*
Operating Temperature......................................−55°C to +125°C
Storage Temperature .........................................−65°C to +150°C
Voltage on Any Pin
with Respect to Ground ........................................ −1.0V to +7.0V
Maximum Operating Voltage .......................................... 6.25V
DC Output Current........................................................ 5.0 mA
*NOTICE:
Stresses beyond those listed under “Absolute Maxi-
mum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions beyond those indicated in the operational sec-
tions of this specification is not implied. Exposure to
absolute maximum rating conditions for extended
periods may affect device reliability
Figure 3-1. Block Diagram
Note:
When the ORG pin is connected to VCC, the “x 16” organization is selected. When it is connected to ground, the “x 8” organiza-
tion is selected. If the ORG pin is left unconnected and the application does not load the input beyond the capability of the
internal 1 Meg ohm pullup, then the “x 16” organization is selected.
For the AT93C46, if “x 16” organization is the mode of choice and Pin 6 (ORG) is left unconnected, Atmel recommends
using the AT93C46A device. For more details, see the AT93C46A datasheet.
2 AT93C46
5125C–SEEPR–11/07

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AT93C46
Table 3-1. Pin Capacitance(1)
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +5.0V (unless otherwise noted)
Symbol Test Conditions
Max
Units
Conditions
COUT
CIN
Note:
Output Capacitance (DO)
Input Capacitance (CS, SK, DI)
1. This parameter is characterized and is not 100% tested.
5 pF VOUT = 0V
5 pF VIN = 0V
Table 3-2. DC Characteristics
Applicable over recommended operating range from: TA = 40°C to +125°C, VCC = +2.7V to +5.5V (unless otherwise
noted)
Symbol Parameter
Test Condition
Min Typ Max Unit
VCC1
Supply Voltage
2.7 5.5 V
VCC2
Supply Voltage
4.5 5.5 V
READ at 1.0 MHz
ICC
Supply Current
VCC = 5.0V
WRITE at 1.0 MHz
0.5 2.0 mA
0.5 2.0 mA
ISB1
Standby Current
VCC = 2.7V
CS = 0V
ISB2
Standby Current
VCC = 5.0V
CS = 0V
IIL
Input Leakage
VIN = 0V to VCC
IOL
VIL1(1)
VIH1(1)
Output Leakage
Input Low Voltage
Input High Voltage
VIN = 0V to VCC
2.7V VCC 5.5V
VOL1
VOH1
Note:
Output Low Voltage
Output High Voltage
2.7V VCC 5.5V
IOL = 2.1 mA
IOH = 0.4 mA
1. VIL min and VIH max are reference only and are not tested.
0.6
2.0
2.4
6.0
10.0
0.1
0.1
10.0
15.0
1.0
1.0
0.8
VCC + 1
0.4
µA
µA
µA
µA
V
V
V
5125C–SEEPR–11/07
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