Contents
Features ..........................................................................................................
Pin Assignment................................................................................................
Pin Functions...................................................................................................
Block Diagram .................................................................................................
Instruction Set..................................................................................................
Absolute Maximum Ratings .............................................................................
Recommended Operationg Conditions............................................................
Pin Capacitance ..............................................................................................
Endurance .......................................................................................................
DC Characteristics...........................................................................................
AC Characteristics...........................................................................................
Operation.........................................................................................................
1
1
1
2
2
2
3
3
3
4
5
6
Receiving a Start-Bit........................................................................................ 9
Three-wire Interface(DI-DO direct connection) ................................................ 9
Connecting to CPU with a Serial Port .............................................................. 10
Memory Protection .......................................................................................... 10
Dimensions (Unit : mm) ................................................................................... 11
Ordering Information........................................................................................ 12
Characteristics................................................................................................. 13
Frequently Asked Questions ......................................................................... 18
CMOS SERIAL E
2
PROM
S-29X94A Series
The S-29X94A Series is high speed, low power 1K/2K/4K-bit serial
E
2
PROM with a wide operating voltage range. They are organized as
64-word
16-bit, 128-word
16-bit and 256-word
16-bit, respectively.
Each is capable of sequential read, where addresses are automatically
incremented in 16-bit blocks.
The S-29X94A Series is capable of protecting the memory, 50% of
which can be protected starting from address 00.
Interface is structured so that this IC can be directly connected to the
CPU with serial ports. 8-bit instructions make it easy to prepare your
own software.
Features
Can be easily connected to the serial port
Low power consumption
Standby
: 1.0
A Max.
(V
CC
=6.5 V)
CS Active "L"
Endurance : 10 cycles/word
Data retention : 10 years
S-29194A : 1 Kbits
S-29294A : 2 Kbits
S-29394A : 4 Kbits
5
Operating : 0.8 mA Max. (V
CC
=5.5 V)
0.4 mA Max. (V
CC
=2.5 V)
Wide operating voltage range
Write
Read
:2.5 to 6.5 V
:1.8 to 6.5 V
Sequential read capable
Memory Protection
Pin Assignment
8-pin DIP
Top view
CS
SK
DI
DO
1
2
3
4
8
7
6
5
S-29194ADP
S-29294ADP
S-29394ADP
V
CC
NC
PROTECT
GND
NC
V
CC
CS
SK
8-pin SOP1
Top view
1
2
3
4
8
7
6
5
PROTECT
GND
DO
DI
S-29194AFJ
S-29294AFJ
S-29394AFJ
*
differs depending on the package type :
A : A type, (blank) : B type
See
Dimensions.
Figure 1
Pin Functions
Table 1
Name
CS
SK
DI
DO
GND
PROTECT
Pin Number
DIP
1
2
3
4
5
6
SOP1
3
4
5
6
7
8
Chip select input
Serial clock input
Serial data input
Serial data output
Ground
Memory Protection Control Input
Connected to GND or Open : Protection Valid
Connected to Vcc
: Protection Invalid
No Connection
Power supply
Function
NC
V
CC
7
8
1
2
Seiko Instruments Inc.
1
CMOS SERIAL E
2
PROM
S-29X94A Series
Block Diagram
Memory array
Write Protection
Circuit
Bank 1*
Bank 2
Address
decoder
V
CC
GND
PROTECT
Data register
DI
Mode decode
logic
Output buffer
DO
CS
SK
Clock generator
*50% of the memory can be protected starting from address 00.
Figure 2
Instruction Set
Table 2
Instruction
READ (Read data)
PROGRAM (Program data)
WRAL (Write all)
ERAL (Erase all)
PEN
PDS
(Program enable)
(Program disable)
Start
Bit
1
1
1
1
1
1
Ope
code
1000xxx
x100xxx
0001xxx
0010xxx
0011xxx
0000xxx
S-29194A
xx A5toA0
xx A5toA0
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
Address
S-29294A
x A6toA0
x A6toA0
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
S-29394A
A7toA0
A7toA0
xxxxxxxx
xxxxxxxx
xxxxxxxx
xxxxxxxx
Data
D
15
to D
0
Output*
D
15
to D
0
Input
D
15
to D
0
Input
—
—
—
x: Doesn't matter.
* : When 16-bit data of the specified address is output, the data of the next address is output.
Absolute Maximum Ratings
Table 3
Parameter
Power supply voltage
Input voltage
Output voltage
Storage temperature under bias
Storage temperature
Symbol
V
CC
V
IN
V
OUT
T
bias
T
stg
Ratings
- 0.3 to +7.0
- 0.3 to V
CC
+0.3
- 0.3 to V
CC
- 50 to +95
- 65 to +150
Unit
V
V
V
°C
°C
2
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