AT93C46B
Features
•
x16 Organization Utilizing “No Connects” for Pins 6 and 7
•
Low Voltage and Standard Voltage Operation
– 5.0 (V
CC
= 4.5V to 5.5V)
– 2.7 (V
CC
= 2.7V to 5.5V)
– 2.5 (V
CC
= 2.5V to 5.5V)
3-Wire Serial Interface
2 MHz Clock Rate (5V) Compatibility
Self-Timed Write Cycle (10 ms max)
High Reliability
– Endurance: 1 Million Cycles
– Data Retention: 100 Years
Automotive Grade and Extended Temperature Devices Available
8-Pin PDIP and JEDEC SOIC Packages
•
•
•
•
•
•
Description
The AT93C46B provides 1024 bits of serial electrically erasable programmable read
only memory (EEPROM) organized as 64 words of 16 bits each. The device is opti-
mized for use in many industrial and commercial applications where low power and
low voltage operation are essential. The AT93C46B is available in space saving 8-pin
PDIP and 8-pin JEDEC packages.
The AT93C46B 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 the part 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 of the part.
The AT93C46B is available in 4.5V to 5.5V, 2.7V to 5.5V, and 2.5V to 5.5V versions.
3-Wire
Serial
E
2
PROMs
1K (64 x 16)
AT93C46B
Pin Configuration
Pin Name
CS
SK
DI
DO
GND
V
CC
NC
Function
Chip Select
Serial Data Clock
Serial Data Input
Serial Data Output
Ground
Power Supply
No Connect
8-Pin PDIP
CS
SK
DI
DO
1
2
3
4
8
7
6
5
VCC
NC
NC
GND
8-Pin SOIC
CS
SK
DI
SO
1
2
3
4
8
7
6
5
VCC
NC
NC
GND
0917A-A–11/97
1
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
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
Block Diagram
2
AT93C46B
AT93C46B
Pin Capacitance
(1)
Applicable over recommended operating range from T
A
= 25°C, f = 1.0 MHz, V
CC
= +5.0V (unless otherwise noted).
Test Conditions
C
OUT
C
IN
Note:
Output Capacitance (DO)
Input Capacitance (CS, SK, DI)
1. This parameter is characterized and is not 100% tested.
Max
5
5
Units
pF
pF
Conditions
V
OUT
= 0V
V
IN
= 0V
DC Characteristics
Applicable over recommended operating range from: T
AI
= -40°C to +85°C, V
CC
= +2.5V to +5.5V,
T
AC
= 0°C to +70°C, V
CC
= +2.5V to +5.5V (unless otherwise noted).
Symbol
V
CC2
V
CC3
V
CC4
I
CC
I
SB1
I
SB2
I
SB3
I
IL
I
OL
V
IL1(1)
V
IH1(1)
V
IL2(1)
V
IH2(1)
V
OL1
V
OH1
V
OL2
V
OH2
Note:
Parameter
Supply Voltage
Supply Voltage
Supply Voltage
READ at 1.0 MHz
Supply Current
Standby Current
Standby Current
Standby Current
Input Leakage
Output Leakage
Input Low Voltage
Input High Voltage
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
Output Low Voltage
Output High Voltage
V
CC
= 5.0V
V
CC
= 2.5V
V
CC
= 2.7V
V
CC
= 5.0V
V
IN
= 0V to V
CC
V
IN
= 0V to V
CC
4.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
≤
2.7V
4.5V
≤
V
CC
≤
5.5V
1.8V
≤
V
CC
≤
2.7V
I
OL
= 2.1 mA
I
OH
= -0.4 mA
I
OL
= 0.15 mA
I
OH
= -100
µA
V
CC
- 0.2
2.4
0.2
-0.1
2.0
0.0
V
CC
x 0.7
WRITE at 1.0 MHz
CS = 0V
CS = 0V
CS = 0V
Test Condition
Min
2.5
2.7
4.5
0.5
0.5
14.0
14.0
35.0
0.1
0.1
Typ
Max
5.5
5.5
5.5
2.0
2.0
20.0
20.0
50.0
1.0
1.0
0.8
V
CC
+ 1
V
CC
x 0.3
V
CC
+ 1
0.4
Units
V
V
V
mA
mA
µA
µA
µA
µA
µA
V
V
V
V
V
V
1. V
IL
and V
IH
max are reference only and are not tested.
3
AC Characteristics
Applicable over recommended operating range from T
A
= -40°C to + 85°C, V
CC
= +2.5V to + 5.5V,
C
L
= 1 TTL Gate and 100 pF (unless otherwise noted).
Symbol
f
SK
Parameter
SK Clock Frequency
Test Condition
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
Relative to SK
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
4.5V
≤
V
CC
≤
5.5V
2.7V
≤
V
CC
≤
5.5V
2.5V
≤
V
CC
≤
5.5V
0.1
t
WP
Endurance
Write Cycle Time
4.5V
≤
V
CC
≤
5.5V
25°C, V
CC
= 5.0V, Page Mode
1M
1
Min
0
0
0
250
250
500
250
250
500
250
250
500
50
50
100
100
100
200
0
100
100
200
250
250
500
250
250
500
250
250
500
100
100
200
10
Typ
Max
2
1
0.5
Units
MHz
t
SKH
SK High Time
ns
t
SKL
SK Low Time
ns
t
CS
Minimum CS Low Time
ns
t
CSS
CS Setup Time
ns
t
DIS
t
CSH
t
DIH
DI Setup Time
CS Hold Time
DI Hold Time
Relative to SK
Relative to SK
Relative to SK
ns
ns
ns
t
PD1
Output Delay to ‘1’
AC Test
ns
t
PD0
Output Delay to ‘0’
AC Test
ns
t
SV
CS to Status Valid
AC Test
ns
t
DF
CS to DO in High Impedance
AC Test
CS = V
IL
ns
ms
ms
Cycles
4
AT93C46B
AT93C46B
Instruction Set for the AT93C46B
Instruction
READ
EWEN
ERASE
WRITE
ERAL
WRAL
EWDS
SB
1
1
1
1
1
1
1
Op Code
10
00
11
01
00
00
00
Address
(x16)
A
5
- A
0
11XXXX
A
5
- A
0
A
5
- A
0
10XXXX
01XXXX
00XXXX
Comments
Reads data stored in memory, at specified address.
Write enable must precede all programming modes.
Erase memory location A
n
- A
0
.
Writes memory location A
n
- A
0
.
Erases all memory locations. Valid only at V
CC
= 4.5V to 5.5V.
Writes all memory locations. Valid only at V
CC
= 4.5V to 5.5V.
Disables all programming instructions.
5
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