ATMEL AT93C46B 3-wire serial e2prom Datasheet

AT93C46B
Features
• x16 Organization Utilizing “No Connects” for Pins 6 and 7
• Low Voltage and Standard Voltage Operation
•
•
•
•
•
•
– 5.0 (VCC = 4.5V to 5.5V)
– 2.7 (VCC = 2.7V to 5.5V)
– 2.5 (VCC = 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
3-Wire
Serial
E2PROMs
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 optimized 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 3wire 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 selftimed 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.
1K (64 x 16)
AT93C46B
Pin Configuration
Pin Name
Function
CS
Chip Select
SK
Serial Data Clock
DI
Serial Data Input
DO
Serial Data Output
GND
Ground
VCC
Power Supply
NC
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
Block Diagram
2
AT93C46B
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum 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 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.
AT93C46B
Pin Capacitance(1)
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +5.0V (unless otherwise noted).
Test Conditions
Max
Units
Conditions
COUT
Output Capacitance (DO)
5
pF
VOUT = 0V
CIN
Input Capacitance (CS, SK, DI)
5
pF
VIN = 0V
Note:
1. This parameter is characterized and is not 100% tested.
DC Characteristics
Applicable over recommended operating range from: TAI = -40°C to +85°C, VCC = +2.5V to +5.5V,
TAC = 0°C to +70°C, VCC = +2.5V to +5.5V (unless otherwise noted).
Symbol
Parameter
VCC2
Supply Voltage
VCC3
Test Condition
Min
Typ
Max
Units
2.5
5.5
V
Supply Voltage
2.7
5.5
V
VCC4
Supply Voltage
4.5
5.5
V
ICC
Supply Current
ISB1
Standby Current
ISB2
READ at 1.0 MHz
0.5
2.0
mA
WRITE at 1.0 MHz
0.5
2.0
mA
VCC = 2.5V
CS = 0V
14.0
20.0
µA
Standby Current
VCC = 2.7V
CS = 0V
14.0
20.0
µA
ISB3
Standby Current
VCC = 5.0V
CS = 0V
35.0
50.0
µA
IIL
Input Leakage
VIN = 0V to VCC
0.1
1.0
µA
IOL
Output Leakage
VIN = 0V to VCC
0.1
1.0
µA
VIL1(1)
VIH1(1)
Input Low Voltage
Input High Voltage
4.5V ≤ VCC ≤ 5.5V
-0.1
2.0
0.8
VCC + 1
V
VIL2(1)
VIH2(1)
Input Low Voltage
Input High Voltage
1.8V ≤ VCC ≤ 2.7V
0.0
VCC x 0.7
VCC x 0.3
VCC + 1
V
VOL1
VOH1
Output Low Voltage
Output High Voltage
4.5V ≤ VCC ≤ 5.5V
0.4
V
VOL2
VOH2
Output Low Voltage
Output High Voltage
1.8V ≤ VCC ≤ 2.7V
Note:
VCC = 5.0V
IOL = 2.1 mA
IOH = -0.4 mA
2.4
IOL = 0.15 mA
IOH = -100 µA
V
0.2
VCC - 0.2
V
V
1. VIL and VIH max are reference only and are not tested.
3
AC Characteristics
Applicable over recommended operating range from TA = -40°C to + 85°C, VCC = +2.5V to + 5.5V,
CL = 1 TTL Gate and 100 pF (unless otherwise noted).
Symbol
Parameter
Test Condition
Min
Typ
fSK
SK Clock Frequency
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
0
0
0
tSKH
SK High Time
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
250
250
500
ns
tSKL
SK Low Time
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
250
250
500
ns
tCS
Minimum CS Low Time
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
250
250
500
ns
tCSS
CS Setup Time
Relative to SK
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
50
50
100
ns
tDIS
DI Setup Time
Relative to SK
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
100
100
200
ns
tCSH
CS Hold Time
Relative to SK
0
ns
tDIH
DI Hold Time
Relative to SK
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
100
100
200
ns
tPD1
Output Delay to ‘1’
AC Test
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
250
250
500
ns
tPD0
Output Delay to ‘0’
AC Test
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
250
250
500
ns
tSV
CS to Status Valid
AC Test
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
250
250
500
ns
tDF
CS to DO in High Impedance
AC Test
CS = VIL
4.5V ≤ VCC ≤ 5.5V
2.7V ≤ VCC ≤ 5.5V
2.5V ≤ VCC ≤ 5.5V
100
100
200
ns
10
ms
tWP
Write Cycle Time
0.1
Endurance
4
4.5V ≤ VCC ≤ 5.5V
25°C, VCC = 5.0V, Page Mode
AT93C46B
1
1M
Max
Units
2
1
0.5
MHz
ms
Cycles
AT93C46B
Instruction Set for the AT93C46B
SB
Op Code
Address
(x16)
READ
1
10
A5 - A0
Reads data stored in memory, at specified address.
EWEN
1
00
11XXXX
Write enable must precede all programming modes.
ERASE
1
11
A5 - A0
Erase memory location An - A0.
WRITE
1
01
A5 - A0
Writes memory location An - A0.
ERAL
1
00
10XXXX
Erases all memory locations. Valid only at VCC = 4.5V to 5.5V.
WRAL
1
00
01XXXX
Writes all memory locations. Valid only at VCC = 4.5V to 5.5V.
EWDS
1
00
00XXXX
Disables all programming instructions.
Instruction
Comments
5
Functional Description
The AT93C46B is accessed via a simple and versatile
three-wire serial communication interface. Device operation is controlled by seven instructions issued by the host
processor. A valid instruction starts with a rising edge of CS
and consists of a Start Bit (logic ‘1’) followed by the appropriate Op Code and the desired memory Address location.
READ (READ): The Read (READ) instruction contains
the Address code for the memory location to be read. After
the instruction and address are decoded, data from the
selected memory location is available at the serial output
pin DO. Output data changes are synchronized with the rising edges of serial clock SK. It should be noted that a
dummy bit (logic ‘0’) precedes the 16 bit data output string.
ERASE/WRITE (EWEN): To assure data integrity, the
part automatically goes into the Erase/Write Disable
(EWDS) state when power is first applied. An Erase/Write
Enable (EWEN) instruction must be executed first before
any programming instructions can be carried out. Please
note that once in the Erase/Write Enable state, programming remains enabled until an Erase/Write Disable
(EWDS) instruction is executed or VCC power is removed
from the part.
ERASE (ERASE): The Erase (ERASE) instruction programs all bits in the specified memory location to the logical
‘1’ state. The self-timed erase cycle starts once the ERASE
instruction and address are decoded. The DO pin outputs
the READY / BUSY status of the part if CS is brought high
after being kept low for a minimum of 250 ns (tCS). A logic
‘1’ at pin DO indicates that the selected memory location
has been erased, and the part is ready for another instruction.
Synchronous Data Timing
Note:
6
1.
This is the minimum SK period.
AT93C46B
WRITE (WRITE): The Write (WRITE) instruction contains
the 16 bits of data to be written into the specified memory
location. The self-timed programming cycle starts after the
last bit of data is received at serial data input pin DI. The
DO pin outputs the READY/BUSY status of the part if CS is
brought high after being kept low for a minimum of 250 ns
(tCS). A logic ‘0’ at DO indicates that programming is still in
progress. A logic ‘1’ indicates that the memory location at
the specified address has been written with the data pattern contained in the instruction and the part is ready for
further instructions.
ERASE ALL (ERAL): The Erase All (ERAL) instruction
programs every bit in the memory array to the logic ‘1’ state
and is primarily used for testing purposes. The DO pin outputs the READY/BUSY status of the part if CS is brought
high after being kept low for a minimum of 250 ns (tCS). The
ERAL instruction is valid only at VCC = 5.0V ± 10%.
WRITE ALL (WRAL): The Write All (WRAL) instruction
programs all memory locations with the data patterns specified in the instruction. The DO pin outputs the
READY/BUSY status of the part if CS is brought high after
being kept low for a minimum of 250 ns (tCS). The WRAL
instruction is valid only at VCC = 5.0V ± 10%.
ERASE/WRITE DISABLE (EWDS): To protect against
accidental data disturb, the Erase/Write Disable (EWDS)
instruction disables all programming modes and should be
executed after all programming operations. The operation
of the READ instruction is independent of both the EWEN
and EWDS instructions and can be executed at any time.
AT93C46B
Organization Key for Timing Diagrams
I/O
AT93C46B
(x16)
AN
A5
DN
D15
READ Timing
EWEN Timing
EWDS Timing(1)
Note:
1.
Requires a minimum of nine clock cycles.
7
WRITE Timing
WRAL Timing(1)(2)
Notes:
1.
Valid only at VCC = 4.5V to 5.5V.
2.
Requires a minimum of nine clock cycles.
ERASE Timing
8
AT93C46B
AT93C46B
TERAL Timing(1)
Note:
1.
Valid only at VCC = 4.5V to 5.5V.
9
Ordering Information
tWP (max)
(ms)
ICC (max)
(µA)
ISB (max)
(µA)
fMAX
(kHz)
10
2000
50.0
2000
10
800
20.0
10
600
10
Ordering Code
Package
Operation Range
AT93C46B-10PC
AT93C46B-10SC
8P3
8S1
Commercial
(0°C to 70°C)
1000
AT93C46B-10PC-2.7
AT93C46B-10SC-2.7
8P3
8S1
Commercial
(0°C to 70°C)
20.0
500
AT93C46B-10PC-2.5
AT93C46B-10SC-2.5
8P3
8S1
Commercial
(0°C to 70°C)
2000
50.0
2000
AT93C46B-10PI
AT93C46B-10SI
8P3
8S1
Industrial
(-40°C to 85°C)
10
800
20.0
1000
AT93C46B-10PI-2.7
AT93C46B-10SI-2.7
8P3
8S1
Industrial
(-40°C to 85°C)
10
600
20.0
500
AT93C46B-10PI-2.5
AT93C46B-10SI-2.5
8P3
8S1
Industrial
(-40°C to 85°C)
Package Type
8P3
8 Lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)
8S1
8 Lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)
Options
Blank
Standard Device (4.5V to 5.5V)
-2.7
Low Voltage (2.7V to 5.5V)
-2.5
Low Voltage (2.5V to 5.5V)
10
AT93C46B
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