72V255LA20PF Integrated Device Technology (Idt), 72V255LA20PF Datasheet - Page 17

• Manufacturer Part Number: 72V255LA20PF
• Description: FIFO Mem Sync Dual Depth/Width Uni-Dir 8K x 18 64-Pin TQFP
• Manufacturer: Integrated Device Technology (Idt)

Specifications of 72V255LA20PF

• Package: 64TQFP
• Configuration: Dual
• Bus Directional: Uni-Directional
• Density: 144 Kb
• Organization: 8Kx18
• Data Bus Width: 18 Bit
• Timing Type: Synchronous
• Expansion Type: Depth|Width
• Typical Operating Supply Voltage: 3.3 V
• Operating Temperature: 0 to 70 °C

NOTES:
1. t
2. LD = HIGH, OE = LOW, EF = HIGH
NOTES:
1. t
2. LD = HIGH.
3. First word latency: 60ns + t
IDT72V255LA/72V265LA 3.3 VOLT CMOS SuperSync FIFO™
Q
Q
D
D
8,192 x 18, 16,384 x 18
WCLK
RCLK
0
0
WCLK
0
0
WEN
RCLK
rising edge of the RCLK and the rising edge of the WCLK is less than t
REN
rising edge of WCLK and the rising edge of RCLK is less than t
SKEW1
- Q
- D
WEN
SKEW3
REN
- D
- Q
OE
EF
n
n
n
n
is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that FF will go high (after one WCLK cycle pus t
is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that EF will go HIGH (after one RCLK cycle plus t
t
ENS
t
DATA IN OUTPUT REGISTER
ENS
t
t
OLZ
t
SKEW1
ENH
t
REF
t
A
REF
Figure 8. Read Cycle, Empty Flag and First Data Word Latency Timing (IDT Standard Mode)
t
OE
(1)
+ 1*
TRCLK
t
SKEW3
t
t
ENH
ENS
t
DS
t
.
A
D
(1)
1
0
NO WRITE
NO OPERATION
Figure 7. Write Cycle and Full Flag Timing (IDT Standard Mode)
t
t
DHS
ENH
LAST WORD
1
SKEW3
2
t
WFF
, then EF deassertion may be delayed one extra RCLK cycle.
SKEW1
t
t
OHZ
t
DS
t
DS
ENS
t
CLKH
, then the FF deassertion may be delayed one extra WCLK cycle.
D
D
1
NO OPERATION
X
t
WFF
t
t
ENH
DH
DATA READ
17
t
DH
t
CLK
2
t
CLKL
t
CLKH
t
t
REF
ENS
t
OLZ
t
SKEW1
t
CLK
(1)
t
CLKL
t
ENS
t
ENH
LAST WORD
t
A
1
NO WRITE
t
ENH
t
A
COMMERCIAL AND INDUSTRIAL
WFF
2
REF
TEMPERATURE RANGES
). If the time between the
). If the time between the
NEXT DATA READ
t
t
ENS
WFF
OCTOBER 22, 2008
t
DS
D
0
D
X
+1
t
REF
t
t
ENH
A
4672 drw 10
t
DH
t
WFF
4672 drw 11
D
1