MITSUBISHI 〈DIGITAL ASSP〉
M66256FP
5120 × 8-BIT LINE MEMORY (FIFO)
FUNCTION
When write enable input WE is “L”, the contents of data inputs
D0 to D7 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 function given below are also performed in synchro-
nization 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 Q7 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
440
mW
Tstg
Storage temperature
–65 ~ 150
°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 ~ D7
VI = GND
WE, WRES, WCK, RE,
RRES, RCK,
D0 ~ D7
VO = VCC
VO = GND
VI = VCC, GND, Output open
tWCK, tRCK = 25ns
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
80
mA
10
pF
15
pF
2