Datasheet MSM81C55-5GS Datasheet (OKI)

E2O0014-27-X2

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

¡ Semiconductor MSM81C55-5RS/GS/JS

¡ Semiconductor

This version: Jan. 1998

Previous version: Aug. 1996

MSM81C55-5RS/GS/JS

2048-Bit CMOS STATIC RAM WITH I/O PORTS AND TIMER

GENERAL DESCRIPTION

The MSM81C55-5 has a 2k-bit static RAM (256 bytes) with parallel I/O ports and a timer. It uses
silicon gate CMOS technology and consumes a standby current of 100 micro ampere, maximum,
while the chip is not selected. Featureing a maximum access time of 400 ns, the MSM81C55-5
can be used in an MSM80C85AH system without using wait states. The parallel I/O consists
of two 8-bit ports and one 6-bit port (both general purpose).
The MSM81C55-5 also contains a 14-bit programmable counter/timer which may be used for
sequence-wave generation or terminal count-pulsing.

FEATURES

• High speed and low power achieved with silicon gate CMOS technology

• 256 words x 8bits RAM

• Single power supply, 3 to 6 V

• Completely static operation

• On-chip address latch

• 8-bit programmable I/O ports (port A and B)

• TTL Compatible

• RAM data hold characteristic at 2 V

• 6-bit programmable I/O port (port C)

• 14-bit programmable binary counter/timer

• Multiplexed address/data bus

• Direct interface with MSM80C85AH

• 40-pin Plastic DIP (DIP40-P-600-2.54): (Product name: MSM81C55-5RS)

• 44-pin Plastic QFJ (QFJ44-P-S650-1.27): (Product name: MSM81C55-5JS)

• 44-pin Plastic QFP (QFP44-P-910-0.80-2K): (Product name: MSM81C55-5GS-2K)

FUNCTIONAL BLOCK DIAGRAM

IO/M

AD

0 - 7

CE

ALE

RD

WR

RESET

TIMER IN

TIMER OUT

256 ¥ 8

Static

RAM

Timer

Port A

PA

A

B

C

8

Port B

8

Port C

6

V

(+5 V)

CC

GND (0 V)

PB

PC

0 - 7

0 - 7

0 - 5

1/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

PIN CONFIGURATION (TOP VIEW)

40 pin Plastic DIP

44 pin Plastic QFP

5

RESET

TIMER IN

PC

4443424140

PC4PC3V

CC

39

2PC1PC0PB7

NC

PC

37

38

363534

PC
PC

TIMER IN

RESET

PC

TIMER OUT

IO/M

WR

ALE
AD
AD
AD
AD
AD
AD
AD
AD

GND

1

3

2

4

3
4
5

5

6
7
8

CE

9

RD

10
11
12

0

13

1

14

2

15

3

16

4

17

5

18

6

19

7

20

40

V

CC

39

PC

2

38

PC

1

37

PC

0

PB

36

7

35

PB

6

34

PB

5

33

PB

4

32

PB

3

31

PB

2

30

PB

1

29

PB

0

28

PA

7

27

PA

6

26

PA

5

25

PA

4

24

PA

3

23

PA

2

22

PA

1

21

PA

0

TIMEROUT

IO/M

WR

ALE

AD

AD

AD

AD

1

2

CE

3

RD

4

5

6

7

0

8

1

9

2

10

3

NC

11 PA

12131415161718

4AD5

AD6AD7GND

AD

192021

0

1PA2PA3

CC

PA

PA

V

TIMER OUT

33

PB

6

PB

32

5

PB

31

4

PB

30

3

PB

29

2

PB

28

1

PB

27

0

26

PA

7

PA

25

6

PA

24

5

23

4

22

NC

44 pin Plastic QFJ

5

PC

RESET

TIMER IN

5

PC4PC3NC

4

3

2

6

1

2PC1PC0PB7

CC

V

PC

43

44

7

IO/M

8

CE

9

RD

10

WR

11

NC

12

ALE

13

14

AD

0

15

AD

1

16

AD

2

AD

17 PA

3

424140

39

PB

6

PB

38

5

PB

37

4

PB

36

3

PB

35

2

NC

34

PB

33

1

32

PB

0

PA

31

7

PA

30

6

29

5

18192021222324

4

AD

NC

AD5AD6AD

7

GND

252627

0

1PA2PA3PA4

PA

PA

28

2/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

ABSOLUTE MAXIMUM RATING

Parameter Unit

Power Supply Voltage

Input Voltage

Output Voltage

Storage Temperature

Power Dissipation

Symbol

V

V

V

OUT

T

STG

P

CC

IN

D

Conditions

Referenced

to GND

—

Ta = 25°C

MSM81C55-5RS

Rating

MSM81C55-5GS MSM81C55-5JS

–0.5 to +7

–0.5 to V

–0.5 to V

CC

CC

+0.5

+0.5

–55 to +150

0.7

1.01.0

OPERATING CONDITION

Parameter UnitSymbol

Power Supply Voltage

Operating Temperature

V

CC

T

OP

Range

3 to 6

–40 to +85

RECOMMENDED OPERATING CONDITIONS

Parameter UnitSymbol

Power Supply Voltage (81C55)

Operating Temperature (81C55)

"L" Level Input V

"H" Level Input

Supply Voltage (81C55-5)

Operating Temperature (81C55-5)

Min.

V

CC

T

OP

IL

V

IH

V

CC

V

OP

4.5

–40

–0.3

2.2

Typ.

5V

+25

—

—

54.75 5.25

+25–40 +70

Max.

+0.8

V

CC

5.5

+85

+0.3

V

V

V

°C

W

V

°C

°C

V

V

V

°C

DC CHARACTERISTICS

Parameter Unit

"L" Level Output Voltage

"H" Level Output Voltage

Input Leak Current

Output Leak Current

Symbol

V

OL

V

OH

I

LI

I

LO

I

= 2 mA

OL

I

= –400 mA

OH

I

= –40 mA

OH

0 £ V

0 £ V
CE ≥ V

Standby Current

Mean Operating
Current

I

CCS

I

CC

≥ V

V

IH

V

£ –0.2 V

IL

Memory cycle
time: 1 ms

IN

OUT

CC

£ V

CC

£ V

–0.2 V

–0.2 V

Condition

CC

CC

= 4.5 V to 5.5 V

V

CC

= –40°C to 85°C

Ta

Min.

—

2.4

4.2

–10

–10

—

—

Typ. Max.

— 0.45 V

—— V

—— V

—10mA

—10mA

0.1 100 mA

—5mA

3/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

AC CHARACTERISTICS

V

= 4.75 V to 5.25 V,

CC

Ta = –40 to +70°C
80C85AH 5MHz I/F

Parameter

V

= 4.5 V to 5.5 V,

CC

Symbol Unit Remarks

Ta = –40 to +80°C
80C85AH 3MHz I/F

Min.

Address/latch Setup Time
Latch/address Holt Time
Latch/read (write) Delay Time
Read/output Delay Time
Address/output Delay Time
Latch Width
Read/data Bus Floating Time
Read (write)/latch Delay Time
Read (write) Width
Data In/write Setup Time
Write/data-in Hold Time
Recovery Time
Write/port Output Delay Time
Port Input/read Setup Time Load capaci­Read/port Input Hold Time
Strobe/buffer Full Delay Time
Strobe Width
Strobe/buffer Empty Delay Time
Strobe/interrupt-on Delay Time
Read/interrupt-off Delay Time
Port Input/strobe Setup Time
Strobe/port-input Hold Time
Strobe/buffer-empty Delay Time
Write/buffer-full Delay Time
Write/interrupt-off Delay Time
Time Output Delay Time Low
Time Output Delay Time High
Read/data Buse Enable Delay Time
Timer Cycle Time
Timer Input Rise and Fall Times
Timer Input Low Level Time
Timer Input High Level Time
WRITE to TIMER-IN

for writes which start counting
TIMER-IN to WRITE

for writes which start counting

t

t
t

t

t

t

t
t
t
t

t

t
t
tr, t

t

t

t

AL

t

LA

t

LC

t

RD

t

AD

t

LL

RDF

t

CL

t

CC

DW

WD

t

RV

WP

t

PR

t

RP

SBF

t

SS

RBE

t

SI

RDI

PSS

PHS

SBE

WBF

t

WI

t

TL

t

TH

RDE

CYC

t

1

t

2

WT

TW

f

50
30

100

—
—

100

0

20
250
150

0

300

—

70
50
—

200

—
—
—
50

120

—
—
—
—
—
10

320

—
80

120

200

0

Max.

—
—

—
170
400

—
100

—

—

—

—

—
400

—

—
400

—
400
400
400

—

—
400
400
400
400
400

—

—

80

—

—

—

—

37 —
30 —
40 —
— 140
— 330
70 —

080

20 —
200 —
100 —

25 —
200 —

— 300

50 —
10 —
— 300

150 —

— 300
— 300
— 300
20 —

100 —

— 300
— 300
— 300
— 300
— 300
10 —

320 —

—80
40 —
70 —

200 —

0—

Max.Min.

ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns

tance: 150 pF

ns
ns
ns
ns
ns
ns
ns
ns
ns
ns

ns
ns
ns
ns
ns
ns
ns
ns
ns

ns

ns

Note: Timings are measured wth VL = 0.8 V and VH = 2.2 V for both input and output.

4/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

TIMING DIAGRAM

Read Cycle

CE

AD

Write Cycle

AD

IO/M

0 - 7

ALE

RD

CE

IO/M

0 - 7

ALE

WR

t

t

AL

LL

t

AL

t

LL

Address

Address

t

LA

t

AD

Data Valid

t

LA

t

t

RDE

t

RD

t

LC

t

CC

RDF

t

CL

t

RV

Data Valid

t

DW

t

LC

t

CL

t

WD

t

CC

t

RV

5/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

Strobe Input Mode

BF

t

SBF

STROBE

INTR

t

SS

t

SI

t

RBE

t

RDI

RD

Input Data

From Port

Strobe Output Mode

BF

STROBE

INTR

WR

Output Data

To Port

t

PSS

t

t

PHS

t

SBE

t

WBF

WI

t

WP

t

SI

6/19

¡ Semiconductor MSM81C55-5RS/GS/JS

y

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

Basic Input Mode

t

RP

Port Input

Data Bus

Basic Output Mode

Port Output

RD

WR

t

PR

t

WP

Data Bus

Note: The DATA BUS timing is the same as the read and write cycles.

Timer Waveforms 1

Load Counter From
Count Length Register

TIMER IN

TIMER OUT

(Pulse)

TIMER OUT

(Square Wave)

Note: Periodicall

Load Counter From
Count Length Register

t

f

t

t

r

1

(Note)

(Note)

t

CYC

t

2

t

TL

t

TL

Count Down(5Æ1)

outut according to the output mode (m1=1) programming contents.

1234512 5

(T.C)

t

TH

t

TH

7/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

Timer Waveforms 2

WR

Timer - Start

t

TW

t

WT

TIMER IN

RAM DATA HOLD CHARACTERISTICS AT LOW SUPPLY VOLTAGE

Item UnitSymbol Condition

Data Holding Supply Voltage V

Data Holding Supply Current I

Setup Time t

Hold Time t

CCH

CCH

SU

R

VIN = 0 V or VCC, ALE = 0 V

V

= V

CC

V

= 0 V or V

IN

Two ways to place device in standby mode:

, ALE = 0

CCH

CC

Specification

Min. Typ.

Max.

2.0 — V

— 0.05 mA

30 — ns

20 —

—

20

—

—ns

(1) Method using CE

V

5 V

4.5 V

V

CCH

ALE

0.8 V
0 V

2.2 V

CE

V

CCH

CC

t

SU

Standby Mode

t

LA

t

R

t

AL

8/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

(2) Method using RESET

5 V

t

SU

V

CC

Standby Mode

t

R

4.5 V

2.2 V

V

CCH

GND

RESET

Note: In this case, the C/S register is reset, the port is set into the input mode, and the timer stops.

PIN FUNCTION

Symbol Function

RESET

ALE

AD

0 - 7

CE When the CE input is high, both read and write operations to the chip are disabled.

IO/M A high level input to this pin selects the internal I/O functions, and a low level selects the memory.

RD

WR

PA

0 - 7

(PB

)

0 - 7

PC

0 - 5

TIMER IN Input to the counter/timer

TIMER OUT

V

CC

GND GND

A high level input to this pin resets the chip, places all three I/O ports in the input mode, resets all
output latches and stops timer.

Negative going edge of the ALE (Address Latch Enable) input latches AD

, IO/M, and CE signals into

0 - 7

the respective latches.

Three-state, bi-directional address/data bus. Eight-bit address information on this bus is read into
the internal address latch at the negative going edge of the ALE. Eight bits of data can be read from
or written to the chip using this bus depending on the state of the WRITE or READ input.

If this pin is low, data from either the memory or ports is read onto the AD

lines depending on

0 - 7

the state of the IO/M line.

If this pin is low, data on lines AD

is written into either the memory or into the selected port

0 - 7

depending on the state of the line IO/M line.

General-purpose I/O pins. Input/output directions can be determined by programming the command/
status (C/S) register.

Three pins are usable either as general-purpose I/O pins or control pins for the PA and PB ports.
When used as control pins, they are assigned to the following functions:
PC

: A INTR (port A interrupt)

0

: A BF (port A full)

PC

1

PC

: A STB (port A strobe)

2

PC

: B INTR (port B interrupt)

3

: B BF (port B buffer full)

PC

4

: B STB (port B strobe)

PC

5

Timer output. When the present count is reached during timer operation, this pin provides
a square-wave or pulse output depending on the programmed control status.

3–6V power supply

9/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

OPERATION

Description

The MSM81C55-5 has three functions as described below.

• 2K-bit static RAM (256 words ¥ 8 bits)

• Two 8-bit I/O ports (PA and PB) and a 6-bit I/O port (PC)

• 14-bit timer counter

The internal register is shown in the figure below, and the I/O addresses are described in the
table below.

8 Bit Internal Data Bus

A

A

7

6

¥

¥

¥

¥

¥

¥

¥

¥

¥

¥

¥

¥

¥: Don't care.

Command

Status

I/O Address

A

5

¥

¥

¥

¥

¥

¥

PC

6 Bit

A

A

4

¥

¥

¥

¥

¥

¥

A

3

2

¥

0

¥

0

¥

0

¥

0

¥

1

¥

1

PB

8 Bit

A

A

1

0

0

0

0

1

1

0

1

1

0

0

0

1

PA

8 Bit

Internal command/status register
Universal I/O port A (PA)

Universal I/O port B (PB)
I/O port C (PC)

Timer count lower position 8 bits (LSB)
Timer count upper position 6 bits and timer mode

2 bits (MSB)

Timer

MSB

Timer Mode

Selecting Register

Timer

LSB

10/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

(1) Programming the Command/Status (C/S) Register

The contents of the command register can be written during an I/O cycle by addressing it
with an I/O address of xxxxx000. Bit assignments for the register are shown below:

76543210

TM2 TM1 IEB IEA PC2 PC1 PB PA

Timer Command

Definition of PA
Definition of PB

0 - 7

0 - 7

0= Input
1= Output

00=ALT1

Definition of PC

0 - 5

11=ALT2
01=ALT3
10=ALT4

Port A Interrupt Enable 1 = Enabled
Port B Interrupt Enable 0 = Disabled

00 = NOP : Does not affect counter operations.
01 = STOP : Stops the timer if it is runnning.

NOP if the timer is not runnning.

10 = STOP AFTER TC :

Stops the timer when it reaches TC.
NOP if the timer is not running.

11 = START : If the timer is not running, loads the mode and

the count length, and immediately starts timer operation.
If the timer is running, loads a new mode and the count
length, and starts timer operation immediately after
TC is reached.

Port Control Assignment Table

See the port
control
assignment
table.

Pin

PC

0

PC

1

PC

2

PC

3

PC

4

PC

5

ALT1

Input port
Input port

Input port
Input port

Input port
Input port

ALT2

Output port
Output port

Output port
Output port

Output port
Output port

ALT3

A INTR

A BF

A STB
Output port

Output port
Output port

ALT4

A INTR

A BF

A STB

B INTR

B BF

B STB

11/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

(2) Reading the C/S Register

The I/O and timer status can be accessed by reading the contents of the Status register
located at I/O address xxxxx000. The status word format is shown below:

AD

7

AD

6

TIMER

AD

INTE

B

AD

5

AD

4

INTR

B

BF

AD

3

AD

2

INTE

B

A

BF

AD

1

A

0

INTR

A

Port A Interrupt Request

Port A Buffer Full

Port A Interrupt Enable

Port B Interrupt Request

Port B Buffer Full

Port B Interrupt Enable

Timer Interrupt. This bit is set high when the timer
reaches TC, and is reset when the C/S register is read
or a hardware reset occurs.

(3) PA and PB Registers

These registers may be used as either input or output ports depending on the programmed
contents of the C/S register. They may also be used either in the basic mode or in the strobe
mode.
I/O address of the PA register: xxxxx001
I/O address of the PB register: xxxxx010

(4) PC Register

The PC register may be used as an input port, output port or control register depending on
the programmed contents of the C/S register. The I/O address of the PC register is
xxxxx011.

(5) Timer

The timer is a 14-bit down counter which counts TIMER IN pulses.
The low order byte of the timer register has an I/O address of xxxxx100, and the high order
byte of the register has an I/O address of xxxxx101.
The count length register (CLR) may be preset with two bytes of data. Bits 0 through 13 are
assigned to the count length and bits 14 and 15 specify the timer output mode. A read
operation of the CLR reads the contents of the counter and the pertinent output mode. The
initial value range which can initially be loaded into the counter is 2 through 3FFF hex. Bit
assignments to the timer counter and possible output modes are shown in the following.

M

M

2

Output Mode High Order 6 Bits of Count Length

T

7

T

1

T

6

Low Order Byte of Count Length

T

13

12

T

T

5

4

T

T

11

T

3

T

10

T

2

T

9

8

T

T

1

0

12/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

M2M

1

0 0 Outputs a low-level signal in the latter half (Note 1) of a count period.
0 1 Outputs a low-level signal in the latter half of a count period, automatically

loads the programmed count length, and restarts counting when the TC

value is reached.
1 0 Outputs a pulse when the TC value is reached.
1 1 Outputs a pulse each time the preset TC value is reached, automatically

loads the programmed count length, and restarts from the beginning.

Notes: 1. When counting an asymmetrical value such as (9), a high level is output during

the first period of five,and a low level is output during the second period of four.

2. If an internal counter of the MSM81C55-5 receives a reset signal, count operation
stops but the counter is not set to a specific initial value or output mode. When
restarting count operation after reset, the START command must be executed
again through the C/S register.

Note that while the counter is counting, you may load a new count and mode into the CLR.
Before the new count and mode will be used by the counter, you must issue a START
command to the counter. Please note the timer circuit on the MSM81C55-5 is designed to
be a square-wave timer, not a event counter. To achieve this, it counts down by twos twice
in completing one cycle. Thus, its registers do not contain values directly representing the
number of TIMER IN pulse received. After the timer has started counting down, the values
residing in the count registers can be used to calculate the actual number of TIMER IN pulse
required to complete the timer cycle if desired. To obtain the remaining count, perform the
following operations in order.

1. STOP the counter

2. Read in the 16-bit value from the count registers.

3. Reset the upper two mode bits

4. Reset the carry and rotate right one position all 16 bits through carry

5. If carry is set, add 1/2 of the full original count (1/2 full count-1 if full count is odd).

Note: If you started with an odd count and you read the count registers before the third
count pulse occurs, you will not be able to recognize whether one or two
counts have occurred. Regardless of this, the MSM81C55­5 always counts out the right number of pulses in generating the
TIMER OUT waveforms.

TIMER-IN

WR

TIMER-OUT

TIMER-OUT

WR

TIMER-OUT

TIMER-OUT

n=5

(Square Wave)

(Pulse)

n=4

(Square Wave)

(Pulse)

Start

Start

55 34 2

(TC)

53 42

534

(TC)

55

Note: n is the value set in the CLR. Figures in the diagram refer to counter values

13/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

(6) Standby Mode (see page 7)

The MSM81C55-5 is placed in standby mode when the high level at the CE input is latched
during the negative going edge of ALE. All input ports and the timer input should be pulled
up or down to either VCC or GND potential.
When using battery back-up, all ports should be set low or in input port mode. The timer
output should be set low. Otherwise, a buffer should be added to the timer output and the
battery should be connected to the power supply pins of the buffer.
By setting the reset input to a high level, the standby mode can be selected. In this case, the
command register is reset, so the ports automatically set to the input mode and the timer
stops.

14/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

NOTICE ON REPLACING LOW-SPEED DEVICES WITH HIGH-SPEED DEVICES

The conventional low speed devices are replaced by high-speed devices as shown below.
When you want to replace your low speed devices with high-speed devices, read the replacement
notice given on the next pages.

High-speed device (New)

M80C85AH
M80C86A-10

M80C88A-10

M82C84A-2

M81C55-5
M82C37B-5

M82C51A-2

M82C53-2
M82C55A-2

Low-speed device (Old)

M80C85A/M80C85A-2

M80C86A/M80C86A-2

M80C88A/M80C88A-2

M82C84A/M82C84A-5

M81C55
M82C37A/M82C37A-5

M82C51A

M82C53-5
M82C55A-5

Remarks

8bit MPU
16bit MPU

8bit MPU

Clock generator

RAM.I/O, timer
DMA controller

USART

Timer
PPI

15/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

Differences between MSM81C55-5 and MSM81C55

1) Manufacturing Process

These devices use a 3 m Si-CMOS.

2) Design

These devices use the same chip. However, different outgoing inspection standards are used for
these devices separately.

3) Electrical Characteristics

''Oki's '96 Data Book for MICROCONTROLLER'' describes that the MSM81C55-5 satisfies the
electrical characteristics of the MSM81C55.

As shown above, the devices can be replaced without any trouble.

16/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

PACKAGE DIMENSIONS

(Unit : mm)

DIP40-P-600-2.54

Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)

Epoxy resin
42 alloy
Solder plating
5 mm or more

6.10 TYP.

Notes for Mounting the Surface Mount Type Package

The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).

17/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

(Unit : mm)

QFJ44-P-S650-1.27

Mirror finish

Package material
Lead frame material
Pin treatment
Solder plate thickness
Package weight (g)

Epoxy resin
Cu alloy
Solder plating
5 mm or more

2.00 TYP.

Notes for Mounting the Surface Mount Type Package

The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).

18/19

¡ Semiconductor MSM81C55-5RS/GS/JS

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

(Unit : mm)

QFP44-P-910-0.80-2K

Mirror finish

Package material
Lead frame material
Pin treatment
Solder plate thickness

Package weight (g)

Epoxy resin
42 alloy
Solder plating
5 mm or more

0.41 TYP.

Notes for Mounting the Surface Mount Type Package

The SOP, QFP, TSOP, SOJ, QFJ (PLCC), SHP and BGA are surface mount type packages, which
are very susceptible to heat in reflow mounting and humidity absorbed in storage.
Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the
product name, package name, pin number, package code and desired mounting conditions
(reflow method, temperature and times).

19/19

欢迎索取免费详细资料、设计选型指南和光盘、样品；产品繁多未能尽录，欢迎

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

SUNSTAR电子元器件 http://www.sunstare.com/ TEL: [phone] FAX:[phone] E-MAIL:[e-mail]

来电查询。

中国传感器科技信息网：HTTP：//WWW.SENSOR-IC.COM/
工控安防网：HTTP：//WWW.PC-PS.NET/
消费电子专用电路网：HTTP://WWW.SUNSTARE.COM/

E-MAIL： [e-mail] [e-mail]

ＭＳＮ：　[e-mail]　
ＱＱ：　１９５８４７３７６

地址： 深圳市福田区福华路福庆街鸿图大厦 1602 室
电话：[phone] 83376489 83387030 83387016
传真：[phone] 83338339 邮编：518033 手机：[phone]
深圳展销部： 深圳华强北路赛格电子市场 2583 号 TEL/FAX ：

0755-83665529 25059422
北京分公司：北京海淀区知春路 132 号中发电子大厦3097 号
TEL：[phone] 82615020 13501189838 FAX：[phone]
上海分公司：上海市北京东路 668 号上海賽格电子市场2B35 号
TEL：[phone] 56703037 13701955389 FAX：[phone]

西安分公司：西安高新开发区 20 所(中国电子科技集团导航技术研究所)
　 　 　 　 　 西安劳动南路 88 号电子商城二楼 D23 号

TEL：[phone] 13072977981 FAX:[phone]
成都：ＴＥＬ：[phone]

技术支持：０７５５－８３３９４０３３　１３５０１５６８３７６