Contents
Features.............................................................. 1
Pin Assignment ................................................... 1
Pin Functions ...................................................... 1
Block Diagram..................................................... 2
Instruction Set ..................................................... 2
Absolute Maximum Ratings................................. 2
Recommended Operating Conditions ................. 3
Pin Capacitance .................................................. 3
Endurance........................................................... 3
DC Electrical Characteristics............................... 4
AC Electrical Characteristics ............................... 5
Operation ............................................................ 6
Recieving a Start-Bit ........................................... 11
Three-wire Interface (DI-DO direct connection)... 11
Memory Protection .............................................. 11
Dimensions (Unit:mm)......................................... 12
Ordering Information ........................................... 12
Characteristics .................................................... 13
Frequently Asked Questions .............................. 18
CMOS SERIAL E
2
PROM
S-29LXX1A Series
The S-29LXX1A Series is low power 1K/2K/4K-bit serial E PROM with a
low 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 instruction code is compatible with the NM93CSXX
Series.
The S-29LXX1A Series is capable of protecting the memory, 50% of
which can be protected starting from address 00.
Features
2
Low power consumption
Max. (V
CC
=5.5 V)
Standby
: 0.8
µ
A
Operating : 0.8 mA Max. (V
CC
=5.5 V)
: 0.4 mA Max. (V
CC
=2.7 V)
Low operating voltage range
Write
: 1.8 to 5.5 V
Read
: 1.8 to 5.5 V
Sequential read capable
Memory Protection
Endurance : 10
5
cycles/word
Data retention : 10 years
S-29L131A : 1K bits NM93CS46 instruction code compatible
S-29L221A : 2K bits NM93CS56 instruction code compatible
S-29L331A : 4K bits NM93CS66 instruction code compatible
Pin Assignment
8-pin SOP2
Top view
CS
SK
DI
DO
1
2
3
4
8
7
6
5
V
CC
NC
PROTECT
GND
CS
SK
DI
DO
8-pin SSOP
Top view
1
8
2
7
3
6
4
5
S-29L131AFS
S-29L221AFS
S-29L331AFS
V
CC
NC
PROTECT
GND
S-29L131ADFE
S-29L221ADFE
S-29L331ADFE
*See
Dimensions
Figure 1
Pin Functions
Table 1
Name
CS
SK
DI
DO
GND
PROTECT
Pin Number
SOP2 SSOP
1
1
Chip select input
2
2
Serial clock input
3
4
5
6
3
4
5
6
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
7
8
Seiko Instruments Inc.
1
CMOS SERIAL E
2
PROM
S-29LXX1A Series
Block Diagram
Memory array
PROTECT
Write Protection
Circuit
Bank 1*
Bank 2
Address
decoder
V
CC
GND
Data register
DI
Mode decode logic
CS
Output buffer
DO
SK
Clock generator
* 50% of the memory can be protected starting from address 00
Figure 2
Instruction Set
Table 2
Start
Instruction
READ(Read data)
WRITE
ERASE
(Write data)
(Erase data)
Bit
1
1
1
1
Ope
code
10
01
11
00
Address
Data
S-29L131A S-29L221A S-29L331A
A
5
to A
0
A
5
to A
0
A
5
to A
0
11xxxx
XA
6
to A
0
XA
6
to A
0
XA
6
to A
0
11xxxxxx
A
7
to A
0
A
7
to A
0
A
7
to A
0
11xxxxxx
D
15
to D
0
Output*
D
15
to D
0
Input
EWEN (Program enable)
00xxxx
00xxxxxx 00xxxxxx
EWDS (Program disable)
1
00
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
Seiko Instruments Inc.
CMOS SERIAL E
2
PROM
S-29LXX1A Series
Recommended Operating Conditions
Table
4
Parameter
Power supply voltage
High level input voltage
Low level input voltage
Operating temperature
Symbol
V
CC
V
IH
V
IL
T
opr
Conditions
Read Operation
Write Enable/Disable
Write Operation
Min.
1.8
1.8
0.8×Vcc
0.0
-40
Typ.
Max.
5.5
5.5
Vcc
0.2×Vcc
+85
Unit
V
V
V
V
°C
Pin Capacitance
Table 5
(Ta=25°C, f=1.0 MHz, V
CC
=5 V)
Parameter
Input Capacitance
Output Capacitance
Symbol
C
IN
C
OUT
Conditions
V
IN
=0 V
V
OUT
=0 V
Min.
Typ.
Max.
8
10
Unit
pF
pF
Endurance
Table 6
Parameter
Endurance
Symbol
N
W
Min.
10
5
Typ.
Max.
Unit
cycles/word
Seiko Instruments Inc.
3
CMOS SERIAL E
2
PROM
S-29LXX1A Series
DC Electrical Characteristics
Parameter
Current
consumption
(READ)
Current
consumption
(PROGRAM)
Smbl
Conditions
V
CC
=4.5 V to 5.5 V V
CC
=2.7 V to 4.5 V
Min.
Typ. Max. Min.
V
CC
=1.8 to 2.7 V
Typ. Max.
Typ. Max. Min.
Unit
I
CC1
DO unloaded
0.8
0.6
0.4
mA
I
CC2
DO unloaded
2.0
1.5
1.0
mA
Table
8
Parameter
Standby current
consumption
Input leakage
current
Output leakage
current
Low level output
voltage
High level output
voltage
Smbl
Conditions
CS=GND DO=Open
Other input: Connected to
V
CC
or GND
V
IN
=GND to V
CC
V
OUT
=GND to V
CC
I
OL
=2.1 mA
I
OL
=100
µA
I
OH
=-400
µA
I
OH
=-10
µA
Only when write disable
mode
PROTECT Terminal=V
CC
V
CC
=4.5 V to 5.5 V
Min.
Typ. Max.
V
CC
=2.7 to 4.5 V
Min.
V
CC
=1.8 to 2.7 V
Typ
Max
0.4
µA
µA
µA
V
Unit
Typ. Max. Min.
I
SB
0.1
0.1
0.8
0.1
0.1
0.6
0.1
0.1
I
LI
I
LO
V
OL
1.0
1.0
1.0
1.0
1.0
1.0
V
OH
I
OH
=-100
µA
Write enable latch V
DH
data hold voltage
Pull-Down Current
I
PD
0.45
0.1
2.4
V
CC
-
0.7
V
CC
-
0.7
V
CC
-
0.7
V
CC
-
0.7
1.5
1.5
15
0.1
0.1
V
V
V
V
CC
-
0.3
1.5
50
1
15
V
V
µA
80
4
4
Seiko Instruments Inc.
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