AKM AK93C51A

ASAHI KASEI
[AK93C41A/51A]
AK93C41A / 51A
0.9V operation 1K / 2Kbit Serial CMOS EEPROM
Features
† ADVANCED CMOS EEPROM TECHNOLOGY
Preliminary
† LOW VCC OPERATION … Vcc = 0.9V ∼ 3.6V
† AK93C41A • • 1024 bits, 64 × 16 organization
AK93C51A • • 2048 bits, 128 × 16 organization
† SERIAL INTERFACE
- Interfaces with popular microcontrollers and standard microprocessors
† LOW POWER CONSUMPTION
- 10µA Max. Standby (VCC=3.6V)
† Automatic address increment (READ)
† Automatic write cycle time-out with auto-ERASE
† Busy/Ready status signal
† Software controlled write protection
† Hardware write protect for lower block (AK93C51A only)
† IDEAL FOR LOW DENSITY DATA STORAGE
- Low cost, space saving, 8-pin package
Block Diagram
DAM05E-01
1999/12
-1-
ASAHI KASEI
[AK93C41A/51A]
General Description
The AK93C41A/51A is a 1024/2048-bit serial CMOS EEPROM divided into 64/128 registers of 16 bits each.
The AK93C41A/51A has 4 instructions such as READ, WRITE, EWEN and EWDS. Those instructions control
the AK93C41A/51A.
The AK93C41A/51A can operate full function under wide operating voltage range from 0.9V to 3.6V. The
charge up circuit is integrated for high voltage generation that is used for write operation.
A serial interface of AK93C41A/51A, consisting of chip select (CS), serial clock (SK), data-in (DI) and dataout (DO), can easily be controlled by popular microcontrollers or standard microprocessors. AK93C41A/51A
takes in the write data from data input pin (DI) to a register synchronously with rising edge of input pulse of
serial clock pin (SK). And at read operation, AK93C41A/51A takes out the read data from a register to data
output pin (DO) synchronously with rising edge of SK.
The DO pin is usually in high impedance state. The DO pin outputs "L" or "H" in case of data output or Busy/Ready
signal output.
•
Software and Hardware controlled write protection
When Vcc is applied to the part, the part automatically powers up in the ERASE/WRITE Disable state. In the
ERASE/WRITE disable state, execution of WRITE instruction is disabled. Before WRITE instruction is
executed, EWEN instruction must be executed. The ERASE/WRITE enable state continues until EWDS
instruction is executed or Vcc is removed from the part.
Execution of a read instruction is independent of both EWEN and EWDS instructions.
The PROTECT pin is available only on the AK93C51A. When PROTECT pin is tied to GND, PROGRAM
operations onto the lower 1Kbit ($00a$3F) will not be executed. When PROTECT pin is tied to VCC, normal
operation is enabled. There is an internal pull-down on the PROTECT pin.
•
Busy/Ready status signal
After a write instruction, the DO output serves as a Busy/Ready status indicator. After the falling edge of the
CS initiates the self-timed programming cycle, the DO indicates the Busy/Ready status of the chip if the CS is
brought high after a minimum of 250ns (Tcs). DO=logical "0" indicates that programming is still in progress.
DO=logical "1" indicates that the register at the address specified in the instruction has been written with the
new data pattern contained in the instruction and the part is ready for a next instruction.
The Busy/Ready status indicator is only valid when CS is active (high). When CS is low, the DO output goes
into a high impedance state.
The Busy/Ready signal outputs until a start bit (Logic"1") of the next instruction is given to the part.
„ Type of Products
Model
AK93C41AV
AK93C51AV
Memory size
1Kbits
2Kbits
Temp.Range
-10°C∼70°C
-10°C∼70°C
DAM05E-01
Vcc
0.9V∼3.6V
0.9V∼3.6V
Package
8pin Plastic TSSOP
8pin Plastic TSSOP
1999/12
-2-
ASAHI KASEI
[AK93C41A/51A]
Pin arrangement
(note) AK93C41A • • NC, AK93C51A • • PROTECT
Pin Name
Function
CS
Chip Select
SK
Serial Data Clock
DI
Serial Data Input
DO
Serial Data Output
GND
Ground
PROTECT
Memory Protect
(AK93C51A only)
PROTECT =L or NC : Protect enable
PROTECT =H
Vcc
Power Supply
NC
Not Connected
DAM05E-01
: Protect disable
1999/12
-3-
ASAHI KASEI
[AK93C41A/51A]
Functional Description
The AK93C41A/51A has 4 instructions such as READ, WRITE, EWEN and EWDS. A valid instruction consists
of a Start Bit (Logic"1"), the appropriate Op Code and the desired memory Address location.
The CS pin must be brought low for a minimum of 250ns (Tcs) between each instruction when the instruction
is continuously executed.
Instruction Start
Bit
Op
Code
Address
Data
Comments
READ
1
10
A5-A0
D15-D0
Reads data stored in memory, at specified address.
WRITE
1
01
A5-A0
D15-D0
Writes register.
EWEN
1
00
11XXXX
Write enable must precede all programming modes.
EWDS
1
00
00XXXX
Disables all programming instructions.
WRAL
1
00
01XXXX
D15-D0
Writes all registers.
table1. Instruction Set for the AK93C41A
Instruction Start
Bit
Op
Code
Address
Data
Comments
READ
1
10
X A6-A0
D15-D0
Reads data stored in memory, at specified address.
WRITE
1
01
X A6-A0
D15-D0
Writes register.
EWEN
1
00
11XXXXXX
Write enable must precede all programming modes.
EWDS
1
00
00XXXXXX
Disables all programming instructions.
WRAL
1
00
01XXXXXX
D15-D0
Writes all registers.
table2. Instruction Set for the AK93C51A
(Note)
•
The WRAL instruction are used for factory function test only.
User can't use the WRAL instruction.
• The AK93C41A/51A perceives the start bit in the logic"1" and also "01".
DAM05E-01
1999/12
-4-
ASAHI KASEI
[AK93C41A/51A]
Write
The write instruction is followed by 16 bits of data to be written into the specified address.
The self-timed programming cycle is initiated on the rising edge of the SK clock as the last data bit (D0) is
clocked in. The DO indicates the Busy/Ready status of the chip after the self-timed programming cycle is
initiated.
The Busy/Ready status indicator is only valid when CS is active (high). When CS is low, the DO output goes
into a high impedance state. The Busy/Ready signal outputs until a start bit (Logic"1") of the next instruction is
given to the part.
DO=logical "0" indicates that programming is still in progress. DO=logical "1" indicates that the register at the
address specified in the instruction has been written with the new data pattern contained in the instruction and
the part is ready for a next instruction.
WRITE (AK93C41A)
WRITE (AK93C51A)
DAM05E-01
1999/12
-5-
ASAHI KASEI
[AK93C41A/51A]
Read
The read instruction is the only instruction which outputs serial data on the DO pin.
Following the Start bit, first Op code and address are decoded, then the data from the selected memory
location is available at the DO pin. A dummy bit (logical "0") precedes the 16-bit data from the selected
memory location. The output data changes are synchronized with the rising edges of the serial clock (SK).
The data in the next address can be read sequentially by continuing to provide clock. The address
automatically cycles to the next higher address after the 16bit data shifted out.
AK93C41A • • When the highest address is reached ($3F), the address counter rolls over to
address $00 allowing the read cycle to be continued indefinitely.
•
•
AK93C51A
When the highest address is reached ($7F), the address counter rolls over to
address $00 allowing the read cycle to be continued indefinitely.
READ (AK93C41A)
READ (AK93C51A)
DAM05E-01
1999/12
-6-
ASAHI KASEI
[AK93C41A/51A]
EWEN / EWDS
When Vcc is applied to the part, the part automatically powers up in the ERASE/WRITE Disable state. In the
ERASE/WRITE disable state, execution of WRITE instruction is disable. Before WRITE instruction is
executed, EWEN instruction must be executed. The ERASE/WRITE enable state continues until EWDS
instruction is executed or Vcc is removed from the part.
Execution of a read instruction is independent of both EWEN and EWDS instructions.
EWEN/EWDS (AK93C41A)
EWEN/EWDS (AK93C51A)
DAM05E-01
1999/12
-7-
ASAHI KASEI
[AK93C41A/51A]
Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Power Supply
VCC
-0.6
+5.0
V
All Input Voltages
with Respect to Ground
VIO
-0.6
VCC+0.6
V
Ambient storage temperature
Tst
-65
+150
°C
Stress above 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 above those indicated in the operational sections of the
specification is not implied. Exposure to absolute maximum conditions for extended
periods may affect device reliability.
Recommended Operating Condition
Parameter
Symbol
Min
Max
Unit
Power Supply
VCC
0.9
3.6
V
Ambient Operating Temperature
Ta
-10
+70
°C
DAM05E-01
1999/12
-8-
ASAHI KASEI
[AK93C41A/51A]
Electrical Characteristics
(1) D.C. ELECTRICAL CHARACTERISTICS
( 0.9V≤Vcc≤3.6V, -10°C≤Ta≤70°C, unless otherwise specified )
Parameter
Max.
Unit
*1
TBD
mA
VCC=0.9V, tSKP=10us, *1
TBD
mA
VCC=3.6V, tSKP=4us,
*1
TBD
mA
(READ,EWEN,EWDS) ICC4
VCC=0.9V, tSKP=10us, *1
TBD
mA
Current Dissipation
ICCSB
(Standby)
VCC=3.6V
10.0
uA
Current Dissipation
Symbol
ICC1
(WRITE) ICC2
Current Dissipation
ICC3
Condition
VCC=3.6V, tSKP=4us,
Min.
*2
Input High Voltage
VIH
0.8 × VCC
VCC+0.5
V
Input Low Voltage
VIL
-0.1
0.2 × VCC
V
Output High Voltage
VOH
IOH=-10µA
Output Low Voltage
VOL
IOL=10µA
0.2
V
Input Leakage
ILI
(CS,SK,DI pin)
VCC=3.6V
VIN=VCC/GND
‘1.0
uA
Output Leakage
ILO
(DO pin)
VCC=3.6V, CS=GND
VOUT=VCC/GND
‘1.0
uA
VCC-0.4
V
*1: VIN=VIH/VIL,DO=Open
*2: VIN=VCC/GND,CS=GND,DO=Open
DAM05E-01
1999/12
-9-
ASAHI KASEI
[AK93C41A/51A]
(2) A.C. ELECTRICAL CHARACTERISTICS
( 0.9V≤Vcc≤3.6V, -10°C≤Ta≤70°C, unless otherwise specified )
Parameter
Symbol
SK Cycle Time
SK Pulse Width
Condition
Min.
Max.
Unit
tSKP1
1.8V≤VCC≤3.6V
4
us
tSKP2
0.9V≤VCC<1.8V
10
us
tSKW1
1.8V≤VCC≤3.6V
2
ns
tSKW2
0.9V≤VCC<1.8V
5
us
CS Setup Time
tCSS
TBD
ns
CS Hold Time
tCSH
TBD
ns
Data Setup Time
tDIS
TBD
ns
Data Hold Time
tDIH
TBD
ns
Output delay
tPD1
1.8V≤VCC≤3.6V, *3
TBD
ns
tPD2
0.9V≤VCC<1.8V, *3
TBD
us
tE/W1
1.8V≤VCC≤3.6V
10
ms
tE/W2
0.9V≤VCC<1.8V
20
ms
Selftimed Programming
Time
Min CS Low Time
tCS
TBD
ns
CS to Status Valid1
tSV
CL=100pF
TBD
ns
CS to Status Valid2
tSVV
CL=100pF
TBD
ns
CS to Output High-Z
tOZ1
1.8V≤VCC≤3.6V
TBD
ns
tOZ2
0.9V≤VCC<1.8V
TBD
ns
*3: CL=100pF
DAM05E-01
1999/12
- 10 -
ASAHI KASEI
[AK93C41A/51A]
Synchronous Data timing
The Start of Instruction
The End of Instruction
DAM05E-01
1999/12
- 11 -
ASAHI KASEI
[AK93C41A/51A]
Busy/Ready Signal Output
DAM05E-01
1999/12
- 12 -