Commercial and Industrial Temperature Range
IDT 70V27S/L
High-Speed 3.3V 32K x 16 Dual-Port Static RAM
13
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 (M/S = V
IH)".
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 the 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).
AC Electrical Characteristics Over the
Operating Temperature and Supply Voltage Range
(6)
70V27X15
Com'l Only
70V27X20
Com'l & Ind
70V27X25
Com'l Only
UnitSymbol Parameter Min.Max.Min.Max.Min.Max.
BUSY TIMING (M/S=V
IH
)
t
BAA
BUSY Access Time from Address Match
____
15
____
20
____
25 ns
t
BDA
BUSY Disable Time from Address Not Matched
____
15
____
20
____
25 ns
t
BAC
BUSY Access Time from Chip Enable Low
____
15
____
20
____
25 ns
t
BDC
BUSY Disable Time from Chip Enable High
____
15
____
20
____
25 ns
t
APS
Arbitration Priority Set-up Time
(2)
5
____
5
____
5
____
ns
t
BDD
BUSY Disable to Valid Data
(3)
____
17
____
35
____
35 ns
t
WH
Write Hold After BUSY
(5)
12
____
15
____
20
____
ns
BUSY TIMING (M/S=V
IL
)
t
WB
BUSY Input to Write
(4)
0
____
0
____
0
____
ns
t
WH
Write Hold After BUSY
(5)
12
____
15
____
20
____
ns
PORT-TO-PORT DELAY TIMING
t
WDD
Write Pulse to Data Delay
(1)
____
30
____
45
____
55 ns
t
DDD
Write Data Valid to Read Data Delay
(1)
____
25
____
30
____
50 ns
3603 tbl 14a
70V27X35
Com'l & Ind
70V27X55
Com'l Only
UnitSymbol Parameter Min. Max. Min. Max.
BUSY TIMING (M/S =V
IH
)
t
BAA
BUSY Access Time from Address Match
____
35
____
45 ns
t
BDA
BUSY Disable Time from Address Not Matched
____
35
____
45 ns
t
BAC
BUSY Access Time from Chip Enable Low
____
35
____
45 ns
t
BDC
BUSY Disable Time from Chip Enable High
____
35
____
45 ns
t
APS
Arbitration Priority Set-up Time
(2)
5
____
5
____
ns
t
BDD
BUSY Disable to Valid Data
(3)
____
40
____
50 ns
t
WH
Write Hold After BUSY
(5)
25
____
25
____
ns
BUSY TIMING (M/S =V
IL
)
t
WB
BUSY Input to Write
(4)
0
____
0
____
ns
t
WH
Write Hold After BUSY
(5)
25
____
25
____
ns
PORT-TO-PORT DELAY TIMING
t
WDD
Write Pulse to Data Delay
(1)
____
65
____
85 ns
t
DDD
Write Data Valid to Read Data Delay
(1)
____
60
____
80 ns
3603 tbl 14b