参数资料
型号: IDT70261S25PF8
厂商: IDT, Integrated Device Technology Inc
文件页数: 11/19页
文件大小: 0K
描述: IC SRAM 256KBIT 25NS 100TQFP
标准包装: 750
格式 - 存储器: RAM
存储器类型: SRAM - 双端口,异步
存储容量: 256K(16K x 16)
速度: 25ns
接口: 并联
电源电压: 4.5 V ~ 5.5 V
工作温度: 0°C ~ 70°C
封装/外壳: 100-LQFP
供应商设备封装: 100-TQFP(14x14)
包装: 带卷 (TR)
其它名称: 70261S25PF8
IDT70261S/L
High-Speed 16K x 16 Dual-Port Static RAM with Interrupt
Industrial and Commercial Temperature Ranges
AC Electrical Characteristics Over the
Operating Temperature and Supply Voltage Range (6,7)
70261X15
Com'l Only
70261X20
Com'l & Ind
70261X25
Com'l & Ind
Symbol
Parameter
Min.
Max.
Min.
Max.
Min.
Max.
Unit
BUSY TIMING (M/ S =V IH )
t BAA
t BDA
t BAC
t BDC
BUSY Access Time from Address Match
BUSY Disable Time from Address Not Matched
BUSY Acce ss Time from Chip Enable Low
BUSY Acce ss Time from Chip Enable High
____
____
____
____
15
15
15
15
____
____
____
____
20
20
20
17
____
____
____
____
20
20
20
17
ns
ns
ns
ns
BUSY Disable to Valid Data
Write Hold After BUSY
t APS
t BDD
t WH
Arbitration Priority Set-up Time
(3)
(5)
(2)
5
____
12
____
18
____
5
____
15
____
30
____
5
____
17
____
30
____
ns
ns
ns
BUSY TIMING (M/ S =V IL )
Write Hold After BUSY
t WB
t WH
BUSY Input to Write (4)
(5)
0
12
____
____
0
15
____
____
0
17
____
____
ns
ns
PORT-TO-PORT DELAY TIMING
t WDD
Write Pulse to Data Delay (1)
____
30
____
45
____
50
ns
t DDD
Write Data Valid to Read Data Delay
(1)
____
25
____
30
____
35
ns
3039 tbl 14a
70261X35
Com'l Only
70261X55
Com'l Only
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
BUSY TIMING (M/ S =V IH )
Write Hold After BUSY
t BAA
t BDA
t BAC
t BDC
t APS
t BDD
t WH
BUSY Access Time from Address Match
BUSY Disable Time from Address Not Matched
BUSY Acce ss Time from Chip Enable Low
BUSY Acce ss Time from Chip Enable High
Arbitration Priority Set-up Time (2)
BUSY Disable to Valid Data (3)
(5)
____
____
____
____
5
____
25
20
20
20
20
____
35
____
____
____
____
____
5
____
25
45
40
40
35
____
40
____
ns
ns
ns
ns
ns
ns
ns
BUSY TIMING (M/ S =V IL )
Write Hold After BUSY
t WB
t WH
BUSY Input to Write (4)
(5)
0
25
____
____
0
25
____
____
ns
ns
PORT-TO-PORT DELAY TIMING
t WDD
t DDD
Write Pulse to Data Delay (1)
Write Data Valid to Read Data Delay (1)
____
____
60
45
____
____
80
65
ns
ns
NOTES:
3039 tbl 14b
1. Port-to-port delay through RAM cells from writing port to reading port, refer to "Timing Wave form 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, t WDD – t WP (actual), or t DDD – t DW (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).
11
6.42
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