IDT70121S_14 Datasheet, PDF (12/16 Pages) Integrated Device Technology – HIGH-SPEED 2K x 9 DUAL-PORT STATIC RAM WITH BUSY & INTERRUPT

IDT70121/IDT70125
High-Speed 2K x 9 Dual-Port Static RAM with Busy & Interrupt
Industrial and Commercial Temperature Ranges
Timing Waveform of BUSY Arbritration Controlled by Address⁽¹⁾
tRC OR tWC
ADDR'A'
ADDRESSES MATCH
ADDRESSES DO NOT MATCH
tAPS⁽²⁾
ADDR'B'
BUSY'B'
tBAA
tBDA
NOTES:
1. All timing is the same for left and right ports. Port “A” may be either left or right port. Port “B” is the opposite from port “A”.
2. If tAPS is not satisfied, the BUSY will be asserted on one side or the other, but there is no guarantee on which side BUSY will be asserted
(70121 only).
2654 drw 12
AC Electrical Characteristics Over the
Operating Temperature and Supply Voltage Range⁽¹⁾
70121X25
70125X25
Com'l Only
70121X35
70125X35
Com'l
& Ind
Symbol
Parameter
Min.
Max.
Min.
Max. Unit
INTERRUPT TIMING
tAS
Address Set-up Time
0
____
0
____
ns
tWR
Write Recovery Time
0
____
0
____
ns
tINS
Interrupt Set Time
____
25
____
35
ns
tINR
Interrupt Reset Time
____
25
____
35
ns
70121X55
70125X55
Com'l Only
2654 tbl 12a
Symbol
Parameter
Min. Max. Unit
INTERRUPT TIMING
tAS
Address Set-up Time
0
____
ns
tWR
Write Recovery Time
0
____
ns
tINS
Interrupt Set Time
____
45
ns
tINR
Interrupt Reset Time
____
45
ns
NOTES:
1. 'X' in part numbers indicates power rating (S or L).
2654 tbl 12b
61.422