6.42
IDT71321SA/LA and IDT71421SA/LA
High Speed 2K x 8 Dual-Port Static RAM with Interrupts Industrial and Commercial Temperature Ranges
9
AC Electrical Characteristics Over the
Operating Temeprature and Supply Voltage Range
(4)
NOTES:
1. Transition is measured 0mV from Low or High-impedance voltage with Output Test Load (Figure 2). This parameter is guaranteed by
device characterization but is not production tested.
2. For Master/Slave combination, t
WC = tBAA + tWP, since R/W = VIL must occur after tBAA .
3. If OE is LOW during a R/W controlled write cycle, the write pulse width must be the larger of tWP or (tWZ + tDW) to allow the I/O drivers to turn off data to be
placed on the bus for the required t
DW. If OE is HIGH during a R/W controlled write cycle, this requirement does not apply and the write pulse can be as short
as the specified t
WP.
4. 'X' in part numbers indicates power rating (SA or LA).
Symbol Parameter
71321X20
71421X20
Com'l Only
71321X25
71421X25
Com'l
& Ind
UnitMin. Max. Min. Max.
WRITE CYCLE
t
WC
Write Cycle Time
(2 )
20
____
25
____
ns
t
EW
Chip Enable to End-of-Write 15
____
20
____
ns
t
AW
Address Valid to End-of-Write 15
____
20
____
ns
t
AS
Address Set-up Time 0
____
0
____
ns
t
WP
Write Pulse Width
(3 )
15
____
15
____
ns
t
WR
Write Recovery Time 0
____
0
____
ns
t
DW
Data Valid to End-of-Write 10
____
12
____
ns
t
HZ
Output High-Z Time
(1)
____
10
____
10 ns
t
DH
Data Hold Time 0
____
0
____
ns
t
WZ
Write Enable to Output in High-Z
(1)
____
10
____
10 ns
t
OW
Output Active from End-of-Write
(1 )
0
____
0
____
ns
2691 tbl 09a
Symbol Parameter
71321X35
71421X35
Com'l Only
71321X55
71421X55
Com'l
& Ind
UnitMin. Max. Min. Max.
WRITE CYCLE
t
WC
Write Cycle Time
(2 )
35
____
55
____
ns
t
EW
Chip Enable to End-of-Write 30
____
40
____
ns
t
AW
Address Valid to End-of-Write 30
____
40
____
ns
t
AS
Address Set-up Time 0
____
0
____
ns
t
WP
Write Pulse Width
(3 )
25
____
30
____
ns
t
WR
Write Recovery Time 0
____
0
____
ns
t
DW
Data Valid to End-of-Write 15
____
20
____
ns
t
HZ
Output High-Z Time
(1)
____
15
____
25 ns
t
DH
Data Hold Time 0
____
0
____
ns
t
WZ
Write Enable to Output in High-Z
(1)
____
15
____
30 ns
t
OW
Output Active from End-of-Write
(1 )
0
____
0
____
ns
2691 tbl 09b