6.42
IDT70121/IDT70125
High-Speed 2K x 9 Dual-Port Static RAM with Busy & Interrupt Industrial and Commercial Temperature Ranges
8
AC Electrical Characteristics Over the
Operating Temperature and Supply Voltage Range
(4)
NOTES:
1. Transition is measured 0mV from Low or High-impedance voltage with Output Test Load (Figure 2).
2. This parameter guaranteed by device characterization, but is not production tested.
3. For MASTER/SLAVE combination, t
WC = tBAA + tWP, since R/W = VIL must occur after tBAA .
4. 'X' in part numbers indicates power rating (S or L).
5. The specified t
DH must be met by the device supplying write date to the RAM under all operating conditions.
Although t
DH and t
OW
values will vary over voltage and temperature. The actual tDH will always be smaller than the actual tOW.
6. 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.
Symbol Parameter
70121X25
70125X25
Com'l Only
70121X35
70125X35
Com'l
& Ind
UnitMin. Max. Min. Max.
WRITE CYCLE
t
WC
Write Cycle Time
(4)
25
____
35
____
ns
t
EW
Chip Enable to End-of-Write 20
____
30
____
ns
t
AW
Address Valid to End-of-Write 20
____
30
____
ns
t
AS
Address Set-up Time 0
____
0
____
ns
t
WP
Write Pulse Width
(6 )
20
____
30
____
ns
t
WR
Write Recovery Time 0
____
0
____
ns
t
DW
Data Valid to End-of-Write 12
____
20
____
ns
t
HZ
Output High-Z Time
(1 , 2 ,3 )
____
10
____
15 ns
t
DH
Data Hold Time
(5 )
0
____
0
____
ns
t
WZ
Write Enable to Output in High-Z
(1,3)
____
10
____
15 ns
t
OW
Output Active from End-of-Write
(1,2,3,5)
0
____
0
____
ns
2654 tbl 10a
Symbol Parameter
70121X55
70125X55
Com'l Only
UnitMin. Max.
WRITE CYCLE
t
WC
Write Cycle Time
(4)
55
____
ns
t
EW
Chip Enable to End-of-Write 40
____
ns
t
AW
Address Valid to End-of-Write 40
____
ns
t
AS
Address Set-up Time 0
____
ns
t
WP
Write Pulse Width
(6)
40
____
ns
t
WR
Write Recovery Time 0
____
ns
t
DW
Data Valid to End-of-Write 20
____
ns
t
HZ
Output High-Z Time
(1,2,3)
____
30 ns
t
DH
Data Hold Time
(5)
0
____
ns
t
WZ
Write Enable to Output in High-Z
(1,3)
____
30 ns
t
OW
Output Active from End-of-Write
(1,2,3,5)
0
____
ns
2654 tbl 10b