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| 型号： | IDT70V261L25PFG |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC SRAM 256KBIT 25NS 100TQFP |
| 标准包装： | 45 |
| 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： | 3 V ~ 3.6 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： | 托盘 |
| 产品目录页面： | 1254 (CN2011-ZH PDF) |
| 其它名称： | 70V261L25PFG 800-1390 |
IDT70V261S/L
High-Speed 16K x 16 Dual-Port Static RAM with Interrupt
Truth Table III — Interrupt Flag (1)
Left Port
Industrial and Commercial Temperature Ranges
Right Port
L
H
L
H
R/ W L
L
X
X
X
CE L
L
X
X
L
OE L
X
X
X
L
A 13L -A 0L
3FFF
X
X
3FFE
INT L
X
X
(3)
(2)
R/ W R
X
X
L
X
CE R
X
L
L
X
OE R
X
L
X
X
A 13R -A 0R
X
3FFF
3FFE
X
INT R
(2)
(3)
X
X
Function
Set Right INT R Flag
Reset Right INT R Flag
Set Left INT L Flag
Reset Left INT L Flag
NOTES:
1. Assumes BUSY L = BUSY R =V IH .
2. If BUSY L = V IL , then no change.
3. If BUSY R = V IL , then no change.
Truth Table IV —
Address BUSY Arbitration
3040 tbl 15
Inputs
Outputs
CE L
X
H
X
L
CE R
X
X
H
L
A 0L -A 13L
A 0R -A 13R
NO MATCH
MATCH
MATCH
MATCH
BUSY L (1)
H
H
H
(2)
BUSY R (1)
H
H
H
(2)
Function
Normal
Normal
Normal
Write Inhibit (3)
NOTES:
3040 tbl 16
1. Pins BUSY L and BUSY R are both outputs when the part is configured as a master. Both are inputs when configured as a slave. BUSY X outputs on the IDT70V261 are push
pull, not open drain outputs. On slaves the BUSY X input internally inhibits writes.
2. L if the inputs to the opposite port were stable prior to the address and enable inputs of this port. V IH if the inputs to the opposite port became stable after the address and
enable inputs of this port. If t APS is not met, either BUSY L or BUSY R = LOW will result. BUSY L and BUSY R outputs cannot be LOW simultaneously.
3. Writes to the left port are internally ignored when BUSY L outputs are driving LOW regardless of actual logic level on the pin. Writes to the right port are internally ignored when
BUSY R outputs are driving LOW regardless of actual logic level on the pin.
Truth Table V — Example of Semaphore Procurement Sequence (1,2,3)
Functions
No Action
Left Port Writes "0" to Semaphore
Right Port Writes "0" to Semaphore
Left Port Writes "1" to Semaphore
Left Port Writes "0" to Semaphore
Right Port Writes "1" to Semaphore
Left Port Writes "1" to Semaphore
Right Port Writes "0" to Semaphore
Right Port Writes "1" to Semaphore
Left Port Writes "0" to Semaphore
Left Port Writes "1" to Semaphore
NOTES:
D 0 - D 15 Left
1
0
0
1
1
0
1
1
1
0
1
D 0 - D 15 Right
1
1
1
0
0
1
1
0
1
1
1
Status
Semaphore free
Left port has semaphore token
No change. Right side has no write access to semaphore
Right port obtains semaphore token
No change. Left port has no write access to semaphore
Left port obtains semaphore token
Semaphore free
Right port has semaphore token
Semaphore free
Left port has semaphore token
Semaphore free
3040 tbl 17
1. This table denotes a sequence of events for only one of the eight semaphores on the IDT70V261.
2. There are eight semaphore flags written to via I/O 0 and read from all I/O's (I/O 0 -I/O 15 ). These eight semaphores are addressed by A 0 -A 2 .
3. CE = V IH , SEM = V IL to access the semaphore. Refer to the Semaphore Read/Write Control Truth Table.
13
6.42
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| IDT70V261L25PFG8 | 功能描述:IC SRAM 256KBIT 25NS 100TQFP RoHS:是 类别:集成电路 (IC) >> 存储器 系列:- 标准包装:45 系列:- 格式 - 存储器:RAM 存储器类型:SRAM - 双端口，异步 存储容量:128K（8K x 16） 速度:15ns 接口:并联 电源电压:3 V ~ 3.6 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:托盘 其它名称:70V25S15PF |
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