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M66255FP

8192 × 10-BIT LINE MEMORY (FIFO)

MITSUBISHI ELECTRIC  

MITSUBISHI 〈DIGITAL ASSP〉

M66255FP

8192 × 10-BIT LINE MEMORY (FIFO)

FUNCTION

When write enable input WE is “L”, the contents of data inputs

D0 to D9 are written into memory in synchronization with rise

edge of write clock input WCK. At this time, the write address

counter is also incremented simultaneously.

The write functions given below are also performed in syn-

chronization with rise edge of WCK.

When WE is “H”, a write operation to memory is inhibited and

the write address counter is stopped.

When write reset input WRES is “L”, the write address counter

is initialized.

When read enable input RE is “L”, the contents of memory are

output to data outputs Q0 to Q9 in synchronization with rise

edge of read clock input RCK. At this time, the read address

counter is also incremented simultaneously.

The read functions given below are also performed in syn-

chronization with rise edge of RCK.

When RE is “H”, a read operation from memory is inhibited

and the read address counter is stopped. The outputs are in

the high impedance state.

When read reset input RRES is “L”, the read address counter

is initialized.

ABSOLUTE MAXIMUM RATINGS (Ta = 0 ~ 70°C, unless otherwise noted)

Symbol

Parameter

Conditions

Ratings

Unit

VCC

Supply voltage

–0.5 ~ +7.0

V

VI

Input voltage

A value based on GND pin

–0.5 ~ VCC + 0.5

V

VO

Output voltage

–0.5 ~ VCC + 0.5

V

Pd

Maximum power dissipation

Ta = 25°C

825 (Note 1)

mW

Tstg

Storage temperature

–65 ~ 150

°C

Note 1: Ta ≥ 40°C are derated at –9.7mW/°C

RECOMMENDED OPERATING CONDITIONS

Symbol

Parameter

VCC

GND

Topr

Supply voltage

Supply voltage

Operating ambient temperature

Limits

Unit

Min.

Typ.

Max.

4.5

5

5.5

V

0

V

0

70

°C

ELECTRICAL CHARACTERISTICS (Ta = 0 ~ 70°C, VCC = 5V ± 10%, GND = 0V)

Symbol

VIH

VIL

VOH

VOL

IIH

IIL

IOZH

IOZL

ICC

CI

CO

Parameter

“H” input voltage

“L” input voltage

“H” output voltage

“L” output voltage

“H” input current

“L” input current

Off state “H” output current

Off state “L” output current

Operating mean current dissipa-

tion

Input capacitance

Off state output capacitance

Test conditions

Min.

2.0

IOH = –4mA

IOL = 4mA

VI = VCC

WE, WRES, WCK, RE,

RRES, RCK,

D0 ~ D9

VI = GND

WE, WRES, WCK, RE,

RRES, RCK,

D0 ~ D9

VO = VCC

VO = GND

VI = VCC, GND, Output open

tWCK, tRCK = 30ns

f = 1MHz

f = 1MHz

VCC–0.8

Limits

Typ.

Unit

Max.

V

0.8

V

V

0.55

V

1.0

mA

–1.0

mA

5.0

mA

–5.0

mA

150

mA

10

pF

15

pF

2

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