Seiko Instruments Inc.

The S-29X94A Series is high speed, low power 1K/2K/4K-bit serial
E

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.

Package

8-Pin DIP (PKG drawing code : DP008-A)
8-Pin SOP (PKG drawing code : FJ008-A)

Pin

Assignment

Figure 1

CMOS SERIAL E

PROM

S-29X94A Series

Features

Low power consumption

Standby :

1.0

A Max. (V

6.5 V)

Operating : 0.8 mA Max. (V

5.5 V)

0.4 mA Max. (V

2.5 V)

Wide operating voltage range

Write

:2.5 to 6.5 V

Read

:1.8 to 6.5 V

Sequential read capable

Memory Protection

8-Pin SOP1

Top view

8-Pin DIP

Top view

VCC

GND

VCC

GND

6
5

8
7

PROTECT

S-29194ADPA

S-29294ADPA

S-29394ADPA

S-29194AFJA

S-29294AFJA

S-29394AFJA

3
4

1
2

Rev.1.2

_20

Can be easily connected to the serial port

CS Active "L"

Endurance : 10

cycles/word

Data retention : 10 years

S-29194A : 1 Kbits

S-29294A : 2 Kbits

S-29394A : 4 Kbits

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Pin

Functions

Table 1

Pin Number

Name

DIP SOP1

Function

1 3

Chip select input

2 4

Serial clock input

3 5

Serial data input

4 6

Serial data output

GND

5 7

Ground

PROTECT

6 8

Memory Protection Control Input
Connected to GND or Open : Protection Valid
Connected to Vcc

: Protection Invalid

7 1

No Connection

VCC

8 2

Power supply

Block

Diagram

Instruction

Set

Table 2

Address

Instruction

Start

Bit

Ope

code

S-29194A S-29294A S-29394A

Data

READ (Read data)

1000xxx

xx A5toA0

x A6toA0

A7toA0

to D

Output*

PROGRAM (Program data)

x100xxx

xx A5toA0

x A6toA0

A7toA0

to D

Input

WRAL (Write all)

0001xxx

xxxxxxxx xxxxxxxx xxxxxxxx D

to D

Input

ERAL (Erase all)

0010xxx

xxxxxxxx xxxxxxxx xxxxxxxx

PEN (Program

enable)

0011xxx

xxxxxxxx xxxxxxxx xxxxxxxx

PDS (Program

disable)

0000xxx

xxxxxxxx xxxxxxxx xxxxxxxx

x : Doesn't matter.
* : When 16-bit data of the specified address is output, the data of the next address is output.

Figure 2

Data register

Address
decoder

Mode decode

logic

Clock generator

Output buffer

VCC

GND

Memory array

PROTECT

*50

of the memory can be protected starting from address 00.

Bank 1*

Bank 2

Write Protection

Circuit

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Absolute

Maximum

Ratings

Caution The absolute maximum ratings are rated values exceeding which

the product could suffer physical damage. These values must
therefore not be exceeded under any conditions.

Recommended

Operating

Conditions

Table 4

Parameter Symbol

Conditions Min.

Typ.

Max.

Unit

Read Operation
Write Enable/Disable

1.8 -- 6.5 V

Power supply voltage

Write Operation

2.5

6.5

High level input voltage

5.5 to 6.5 V

4.5 to 5.5 V

2.7 to 4.5 V

1.8 to 2.7 V

0.8

Vcc

2.0

0.8

Vcc

0.8

Vcc

Low level input voltage

5.5 to 6.5 V

4.5 to 5.5 V

2.7 to 4.5 V

1.8 to 2.7 V

0.0

0.2

Vcc

0.8

0.2

Vcc

0.15

Vcc

Operating temperature

opr

40 --

85 °C

Pin Capacitance

Table 5

(Ta

25°C, f

1.0 MHz, V

5 V)

Parameter Symbol

Conditions

Min.

Typ.

Max.

Unit

Input Capacitance

0 V

Output Capacitance

OUT

0 V

Endurance

Table 6

Parameter Symbol

Min.

Typ.

Max. Unit

Endurance N

-- --

cycles/word

Table 3

Parameter Symbol

Ratings

Unit

Power supply voltage

0.3 to

7.0 V

Input voltage

0.3 to V

0.3 V

Output voltage

OUT

0.3 to V

Storage temperature under bias

bias

50 to

95 °C

Storage temperature

stg

65 to

150 °C

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Characteristics

Table 7

5.5 to 6.5

V V

4.5 to 5.5 V

2.5 to 4.5

V V

1.8 to 2.5 V

Parameter Smbl

Conditions

Min. Typ. Max. Min.

Typ. Max. Min.

Typ. Max. Min. Typ. Max.

Unit

Current

consumption
(READ)

CC1

DO
unloaded

-- --

1.0

-- --

0.8

-- --

0.6

-- --

0.4

Current

consumption
(PROGRAM)

CC2

DO
unloaded

-- --

2.5

-- --

2.0

-- --

1.5

Table 8

4.5 to 6.5 V

2.5 to 4.5 V

1.8 to 2.5 V

Parameter Smbl

Conditions

Min. Typ. Max.

Unit

Standby current
consumption

Open

Other input: Connected to

or GND

-- --

1.0

-- --

0.6

-- --

0.4

Input leakage current

GND to V

0.1

1.0

0.1

1.0

0.1 1.0

Output leakage
current

OUT

GND to V

0.1

1.0

0.1

1.0

0.1 1.0

2.1 mA

-- --

0.45

Low level output
voltag

100

-- --

0.1

-- --

0.1

-- --

0.1

400

2.4

100

0.7

High level output
voltage

0.7

0.3

-- --

Write enable latch
data hold voltage

Only when program disable
mode

1.5

-- --

Pull-down current

PROTECT terminal

Vcc

100

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

AC Characteristics

Table 9 Measuring conditions

Input pulse voltage

0.1

to 0.9

Output reference voltage

0.5

Output load

100 pF

Table 10

4.5 to 6.5V

2.5 to 4.5 V

1.8 to 2.5V

Parameter Smbl

Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.

Unit

CS setup time

CSS

0.2

0.4

1.0

CS hold time

CSH

0.2

0.4

1.0

CS deselect time

CDS

0.2

0.4

Data setup time

0.2

0.4

0.8

Data hold time

0.2

0.4

0.8

Output delay time

-- --

0.4

1.0

2.0

Clock frequency

2.0

0.5

0.25 MHz

Clock pulse width

SKH

SKL

0.25

1.0

2.0

Output disable time

HZ1

HZ2

0.15

0.5

1.0

Output enable time

0.15

0.5

1.0

Programming time

4.0

10.0

4.0

10.0

Figure 3 Timing Chart

SKH

CDS

CSS

SKL

HZ2

CSH

HZ1

Hi-Z

Input data is retrieved on the rising edge of SK.
Output data is triggered on the falling edge of SK.

Valid data

(READ)

(VERIFY)

CSS

CSH

Figure 4 Timing Chart for t

CSS

and t

CSH

when SK is "H"

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Operation

Instructions (in the order of start-bit, instruction, address, and data) are latched to DI in synchronization with the rising
edge of SK after CS goes low. A start-bit can only be recognized when the high of DI is latched at the rising edge of SK
after changing CS to low, it is impossible for it to be recognized as long as DI is low, even if there are SK pulses after CS
goes low. Instruction finishes when CS goes high, where it must be high between commands during t

CDS

All input, including DI and SK signals, is ignored while CS is high, which is stand-by mode. The start bit

instruction,

address, and data are 8-bit instructions. This makes it easy to prepare your own software using a serial interface
incorporated into the CPU.

1. READ

The READ instruction reads data from a specified address. After A0 is latched at the risig edge of SK, 16-bit data is
continuously output in synchronization with the falling edge of SK.

When all of the data (D

to D

) in the specified address has been read, data in the next address can be read with the

input of another SK clock. Thus, the data over whole area of the memory can be read by continuously inputting SK
clocks as long as CS is low.

The last address (An ··· A1 A0

1 ··· 11) rolls over to the top address (An ··· A1 A0

0 ··· 00).

Hi-Z

FIgure 5 Read Timing (S-29394A)

* On the S-29194A, A

and A

are optional.

On the S-29294A, A

is optional.

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

2. Write (PROGRAM ,WRAL, ERAL)

The write instructions (PROGRAM,WRAL,ERAL) automatically begins writing to the non-volatile memory when CS goes
high at the completion of the specified clock input.

The write operation is completed in 10 ms (t

Max.), and the typical write period is less than 5 ms. In the S-29X94A

Series, it is easy to VERIFY the completion of the write operation in order to minimize the write cycle by setting CS to low
and checking the DO pin, which is low during the write operation and high after its completion. This VERIFY procedure
can be executed over and over again.

There are two methods to detect a change in the DO output. One is to detect a change from low to high setting CS to low,
and the other is to detect a change from low to high as a result of repetitous operations of returning the CS to high after
setting CS to low and checking the DO output.

Because all SK and DI inputs are ignored during the write operation, any input of instruction will also be disregarded.
When DO outputs high after completion of the write operation or if it is in the high-impedence state (Hi-Z), the input of
instructions is available. Even if the DO pin remains high, it will enter the high-impedence state upon the recognition of
a high of DI (start-bit) attached to the rising edge of an SK pulse.

DI input should be low during the VERIFY procedure.

2.1 PROGRAM

This instruction writes 16-bit data to a specified address.
After changing CS to low, input a start-bit, op-code (PROGRAM), address, and 16-bit data. If there is a data overflow of
more than 16 bits, only the last 16-bits of the data is considered valid. Changing CS to high will start the PROGRAM
operation. It is not necessary to make the data "1" before initiating the PROGRAM operation.

FIgure 6 WRITE Timing (S-29394A)

C D S

1 1

3 2

P R

b u s y

re a d y

D 1 5

H i-Z

S V

1 6

H i-Z

1 7

1 0

S K

D I

D O

A 0

D 0

H Z 1

A 5

A 6 *

A 7 *

re a d y

C S

V E R IF Y

* On the S-29194A, A

and A

are optional.

On the S-29294A, A

is optional.

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

2.2 Write all (WRAL)

This instruction writes the same 16-bit data into every address.

After changing CS to low, input a start-bit, op-code (WRAL), address (optional), and 16-bit data. If there is a data
overflow of more than 16 bits, the write data is shifted for every clock in succession and only the last 16-bit data is valid.
Changing CS to high starts the WRAL operation. It is not necessary to make the data "1" before initiating the WRAL
operation.

Figure 7

WRAL Timing

2.3 Erase all (ERAL)

This instruction erases the data in every address. All data changes to "1".
After changing CS to low, input a start-bit, op-code (ERAL), and address (optional) . It is not necessary to input data.

Changing CS to high starts the ERAL operation.

Figure 8 ERAL Timing

3. Write enable (PEN) and Write disable (PDS)

The PEN instruction puts the S-29X94A Series into write enable mode, which accepts PROGRAM, WRAL, and ERAL
instruction. The PDS instruction puts the S-29X94A Series into write disable mode, which refuses PROGRAM, WRAL,
and ERAL instruction.

The S-29X94A Series powers on in write disable mode, which protects data against unexpected, erroneous write
operations caused by noise and/or CPU malfunctions. It should be kept in write disable mode except when performing
write operations.

Figure 9 PEN/PDS Timing

PEN

PDS

Hi-Z

D15

Hi-Z

HZ1

ready

busy

CDS

VERIFY

Standby

Hi-Z

HZ1

ready

busy

CDS

VERIFY

Standby

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Receiving a Start-Bit

Three-Wire Interface (DI-DO direct connection)

Please refer Application Note "S-29 & S-93C series EEPROMs Tips, Tricks & Traps" for equivalent circuit of each pin.

A start-bit can be recognized by latching the high level of DI at the rising edge of SK after changing CS to low (Start-Bit
Recognition). The write operation begins by inputting the write instruction and setting CS to high. The DO pin then
outputs low during the write operation and high at its completion by setting CS to low (Verify Operation). Therefore, only
after a write operation, in order to accept the next command by having CS go low, the DO pin is switched from a state of
high-impedence to a state of data output; but if it recognizes a start-bit, the DO pin returns to a state of high-impedence
(see Figure 3).

Make sure that data output from the CPU does not interfere with the data output from the serial memory IC when you
configure a 3-wire interface by connecting DI input pin and DO output pin. Such interference may cause a start-bit fetch
problem.

Although the normal configuration of a serial interface is a 4-wire interface to CS, SK, DI, and DO, a 3-wire interface is
also a possibility by connecting DI and DO. However, since there is a possibility that the DO output from the serial
memory IC will interfere with the data output from the CPU with a 3-wire interface, install a resistor between DI and DO
in order to give preference to data output from the CPU to DI(See Figure 10).

SIO

Figure 10 3-wire interface

CPU

S-29X94A

R : 10~100 k

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Connecting to the CPU with Serial Port

Memory

Protection

Precaution

Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic
protection circuit.

Figure 11

Connecting Example

Figure 12

Serial Shift Timing

S-29X94A

I/O

CPU

CPU data output

CPU data fetch

Figure 13 PROTECT Terminal Input Signal Timing

The S-29X94A Series is capable of protecting the memory. So, the contents of the memory will not be miswritten
due to error run or malfunction of the CPU. When the PROTECT terminal is connected to GND or OPEN, write to
Bank 1 in the memory array is prohibited (50

of the memory can be protected starting from address 00).

Because the pull-down resistance is connected to the PROTECT terminal internally, the memory can be
automatically protected when the PROTECT terminal is OPEN. When the protection is valid, the data in the
memory of Bank 1 will not be rewritten. However, because the write control circuit inside the IC functions, the next
instruction cannot be executed during the time period of writing (t

). While write instruction is being input and

write is being executed, always connect the PROTECT terminal to "H", "L" or OPEN, and leave the input signal
unchanged (see Figure 13).

VERIFY

Write Instruction Input

busy

Hi-Z

ready

0.2

s Min.

0.2

s Min.

PROTECT

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Characteristics

1. DC Characteristics

Ta (°C)

0.4

0.2

5.5 V

2 MHz

DATA

0101

CC1

(mA)

Ta (°C)

0.4

0.2

3.3 V

500 KHz

DATA

0101

CC1

(mA)

Ta (°C)

0.4

0.2

1.8 V

10 KHz

DATA

0101

CC1

(mA)

0.4

0.2

2 3 4

5 6

25 °C

1 MHz, 500 KHz

DATA

0101

(V)

0.4

0.2

5 6

25 °C

100 KHz, 10 KHz

DATA

0101

(V)

0.4

0.2

CC1

(mA)

5.0 V

25 °C

1M 2M

10K 100K

(Hz)

Ta (°C)

1.0

0.5

5.5 V

CC2

(mA)

Ta (

°C)

1.0

0.5

3.3 V

CC2

(mA)

CC1

(mA)

CC1

(mA)

100 KH

10 KH

1MHZ

500 KH

1.1 Current consumption (READ) I

CC1

Ambient temperature Ta

1.2 Current consumption (READ) I

CC1

Ambient temperature Ta

1.3 Current consumption (READ) I

CC1

Ambient temperature Ta

1.4 Current consumption (READ) I

CC1

Power supply voltage V

1.5 Current consumption (READ) I

CC1

Power supply voltage V

1.6 Current consumption (READ) I

CC1

Clock frequency f

1.7 Current consumption (PROGRAM) I

CC2

Ambient temperature Ta

1.8 Current consumption (PROGRAM) I

CC2

Ambient temperature Ta

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Ta (°C)

1.0

0.5

5.5 V

0 V

(

Ta (°C)

1.0

0.5

5.5 V

(

1.0

0.5

25 °C

(V)

CC2

(mA)

-6

-7

-8

-9

-10

5.5 V

-11

Ta (°C)

1.0

0.5

5.5 V

CS, SK, DI,

TEST

0 V

(

Ta (°C)

1.0

0.5

5.5 V

CS, SK, DI,

TEST

5.5 V

(A)

(

Ta (°C)

4.6

4.4

4.5 V

400

(V)

4.2

1.9 Current consumption (PROGRAM) I

CC2

Power supply voltage V

1.10 Standby current consumption I

Ambient temperature Ta

1.14 Output leakage current I

Ambient temperature Ta

1.15 Output leakage current I

Ambient temperature Ta

1.16 High level output voltage V

Ambient temperature Ta

1.12 Input leakage current I

Ambient temperature Ta

1.13 Input leakage current I

Ambient temperature Ta

25 °C

(V)

(

1.11 Pull-Down current I

Power supply voltage V

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Ta (°C)

2.5

2.4

2.5 V

100

(V)

2.3

Ta (°C)

0.3

0.2

4.5 V

2.1 mA

(V)

0.1

Ta (°C)

0.03

0.02

1.8 V

100

(V)

0.01

Ta (°C)

10.0

5.0

4.5 V

2.4 V

(mA)

Ta (°C)

2.7 V

2.0 V

(mA)

Ta (

°C)

2.5 V

1.8 V

(mA)

Ta (°C)

4.5 V

0.45 V

(mA)

1.18 High level output voltage V

Ambient temperature Ta

1.19 Low level output voltage V

Ambient temperature Ta

1.20 Low level output voltage V

Ambient temperature Ta

1.21 High level output current I

Ambient temperature Ta

1.22 High level output current I

Ambient temperature Ta

1.23 High level output current I

Ambient temperature Ta

1.24 Low level output current I

Ambient temperature Ta

Ta (°C)

2.7

2.6

2.7 V

100

(V)

2.5

1.17 High level output voltage V

Ambient temperature Ta

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

Ta (°C)

3.0

2.0

3.0

1.5

1 2 3

4 5

25 °C

CS, SK, DI,

PROT

(V)

INV

(V)

INV

(V)

5.0 V

CS, SK, DI

PROT

1.27 Input inversion voltage V

INV

Ambient temperature Ta

1.26 Input inversion voltage V

INV

Power supply voltage V

Ta (°C)

1.0

0.5

1.8 V

0.1 V

(mA)

1.25 Low level output current I

Ambient temperature Ta

CMOS SERIAL E

PROM

S-29X94A Series

Seiko Instruments Inc.

2. AC Characteristics

10 K

25 °C

(V)

max

(Hz)

2 3 4

5 6

25 °C

(V)

(ms)

100 K

1 M

2 M

Ta (°C)

5.0 V

(ms)

Ta (°C)

3.0 V

(ms)

Ta (°C)

0.6

0.4

2.7 V

0.2

(

Ta (°C)

0.3

0.2

4.5 V

0.1

(

Ta (°C)

0.6

0.4

1.8 V

0.2

(

2.7 Data output delay time t

Ambient temperature Ta

2.6 Data output delay time t

Ambient temperature Ta

2.5 Data output delay time t

Ambient temperature Ta

2.3 Program time t

Ambient temperature Ta

2.4 Program time t

Ambient temperature Ta

2.1 Maximum operating frequency f

max

Power supply voltage V

2.2 Program time t

Power supply voltage V

The information described herein is subject to change without notice.

Seiko Instruments Inc. is not responsible for any problems caused by circuits or diagrams described herein
whose related industrial properties, patents, or other rights belong to third parties. The application circuit
examples explain typical applications of the products, and do not guarantee the success of any specific
mass-production design.

When the products described herein are regulated products subject to the Wassenaar Arrangement or other
agreements, they may not be exported without authorization from the appropriate governmental authority.

Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Seiko Instruments Inc. is strictly prohibited.

The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, or any apparatus
installed in airplanes and other vehicles, without prior written permission of Seiko Instruments Inc.

Although Seiko Instruments Inc. exerts the greatest possible effort to ensure high quality and reliability, the
failure or malfunction of semiconductor products may occur. The user of these products should therefore
give thorough consideration to safety design, including redundancy, fire-prevention measures, and
malfunction prevention, to prevent any accidents, fires, or community damage that may ensue.

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