6.42
IDT70121/IDT70125
High-Speed 2K x 9 Dual-Port Static RAM with Busy & Interrupt Industrial and Commercial Temperature Ranges
10
AC Electrical Characteristics Over the Operating Temperature
and Supply Voltage Range
(6)
NOTES:
1. Port-to-port delay through RAM cells from writing port to reading port, refer to “Timing Waveform of Write with Port-to-Port Read and BUSY.
2. To ensure that the earlier of the two ports wins.
3. t
BDD is a calculated parameter and is the greater of 0, tWDD – tWP (actual) or tDDD – tDW (actual).
4. To ensure that a write cycle is inhibited on port 'B' during contention on port 'A'..
5. To ensure that a write cycle is completed on port 'B' after contention on port 'A'.
6. 'X' in part numbers indicates power rating (S or L).
70121X25
70125X25
Com'l Only
70121X35
70125X35
Com'l
& Ind
Symbol Parameter Min.Max.Min.Max.Unit
BUSY TIMING (For MASTER IDT70121)
t
BAA
BUSY Access Time from Address
____
20
____
20 ns
t
BDA
BUSY Disable Time from Address
____
20
____
20 ns
t
BAC
BUSY Access Time from Chip Enable
____
20
____
20 ns
t
BDC
BUSY Disable Time from Chip Enable
____
20
____
20 ns
t
WDD
Write Pulse to Data Delay
(1)
50 60
t
DDD
Write Data Valid to Read Data Delay
(1)
35 45
t
APS
Arbitration Priority Set-up Time
(2)
5
____
5
____
ns
t
BDD
BUSY Disable to Valid Data
(3)
____
30
____
30 ns
t
WH
Write Hold After BUSY
(5)
15
____
20
____
ns
BUSY INPUT TIMING (For SLAVE IDT70125)
t
WB
Write to BUSY Input
(4)
0
____
0
____
ns
t
WH
Write Hold After BUSY
(5)
15
____
20
____
ns
t
WDD
Write Pulse to Data Delay
(1)
____
50
____
60 ns
t
DDD
Write Data Valid to Read Data Delay
(1)
____
35
____
45 ns
2654 tbl 11a
70121X55
70125X55
Com'l Only
Symbol Parameter Min. Max. Unit
BUSY TIMING (For MASTER IDT 70121)
t
BAA
BUSY Access Time from Address
____
30 ns
t
BDA
BUSY Disable Time from Address
____
30 ns
t
BAC
BUSY Access Time from Chip Enable
____
30 ns
t
BDC
BUSY Disable Time from Chip Enable
____
30 ns
t
WDD
Write Pulse to Data Delay
(1)
80
t
DDD
Write Data Valid to Read Data Delay
(1)
65
t
APS
Arbitration Priority Set-up Time
(2)
5
____
ns
t
BDD
BUSY Disable to Valid Data
(3)
____
45 ns
t
WH
Write Hold After BUSY
(5)
20
____
ns
BUSY INPUT TIMING (For SLAVE IDT 70125)
t
WB
Write to BUSY Input
(4)
0
____
ns
t
WH
Write Hold After BUSY
(5)
20
____
ns
t
WDD
Write Pulse to Data Delay
(1)
____
80 ns
t
DDD
Write Data Valid to Read Data Delay
(1)
____
65 ns
2654 tbl 11b
