IDT72V261LA Integrated Device Technology, IDT72V261LA Datasheet - Page 27

• Manufacturer Part Number: IDT72V261LA
• Description: 3.3 Volt Cmos Supersync Fifo
• Manufacturer: Integrated Device Technology

part is pin-for-pin compatible with the original “L” version. Some difference exist between the two versions. The following table details these differences.
NOTES:
1. WCLK and RCLK can vary independently and can be stopped. There is no restriction on operating WCLK and RCLK.
2. This is t
3. Tf is the period of the ‘selected clock’.
4. T
5. Typical I
! 2002 Integrated Device Technology, Inc.
IDT and the IDT logo are registered trademarks. The SuperSync FIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
DIFFERENCES BETWEEN THE IDT72V261LA/72V271LA AND IDT72V261L/72V271L
RCLK
IDT has improved the performance of the IDT72V261/72V271 SuperSync™ FIFOs. The new versions are designated by the “LA” mark. The LA
is the cycle period of the read clock.
SKEW3
CC1
Pin #3
First Word Latency
(IDT Standard Mode)
First Word Latency
Retransmit Latency
(IDT Standard Mode)
Retransmit Latency
(FWFT Mode)
I
I
Typical I
is based on V
CC1
CC2
.
(FWFT Mode)
Item
CC1
CC
(5)
= 3.3V, t
A
= 25#C, f
DC (Don’t Care) - There is
RCLK. See note 1.
60ns
60ns
60ns
60ns
55mA
20mA
10 + 0.95*f
no restriction on WCLK and
3.3 VOLT CMOS SuperSync FIFO
16,384 x 9
32,768 x 9
S
(2)
(2)
(2)
(2)
= WCLK frequency = RCLK frequency (in MHz using TTL levels), data switching at f
+ t
+ t
+ t
+ t
IDT72V261LA
IDT72V271LA
NEW PART
REF
REF
REF
REF
S
+ 0.02*C
+ 1 T
+ 2 T
+ 1 T
+ 2 T
RCLK
RCLK
RCLK
RCLK
L
*f
(4)
(4)
(4)
(4)
S
(mA)
FS (Frequency Select)
t
t
t
t
150mA
15mA
Not Given
FWL
FWL
RTF
RTF
27
1
2
1
2
= 14*Tf
= 14*Tf
= 10*Tf
= 10*Tf
IDT72V261L
IDT72V271L
OLD PART
(3)
(3)
(3)
(3)
+ 3T
+ 4T
+ 2T
+ 3T
™
RCLK
RCLK
RCLK
RCLK
(4)
(4)
(4)
(4)
(ns)
(ns)
(ns) First word latency in the LA part is
(ns) First word latency in the LA part is
In the LA part this pin must be tied
to either V
not toggle after reset.
a fixed value, independent of the
frequency of RCLK or WCLK.
a fixed value, independent of the
frequency of RCLK or WCLK.
Retransmit latency in the LA part is
a fixed value, independent of the
frequency of RCLK or WCLK.
Retransmit latency in the LA part is
a fixed value, independent of the
frequency of RCLK or WCLK.
Active supply current
Standby current
Typical I
S
/2, C
CC1
Comments
CC
L
= Capacitive Load (in pF).
Current calculation
or GND and must
IDT72V261LA
IDT72V271LA