参数资料
型号: IDT70261L20PFI
厂商: IDT, Integrated Device Technology Inc
文件页数: 9/19页
文件大小: 0K
描述: IC SRAM 256KBIT 20NS 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: 20ns
接口: 并联
电源电压: 4.5 V ~ 5.5 V
工作温度: -40°C ~ 85°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: 70261L20PFI
IDT70261S/L
High-Speed 16K x 16 Dual-Port Static RAM with Interrupt
Industrial and Commercial Temperature Ranges
Timing Waveform of Write Cycle No. 1, R/ W Controlled Timing (1,5,8)
t WC
ADDRESS
OE
t AW
t HZ
(7)
CE or SEM
UB or LB
(9)
(9)
t AS (6)
t WP
(2)
t WR
(3)
R/ W
t WZ (7)
t OW
DATA OUT
(4)
t DW
t DH
(4)
DATA IN
3039 drw 07
Timing Waveform of Write Cycle No. 2, CE , UB , LB Controlled Timing (1,5)
t WC
ADDRESS
t AW
CE or SEM
(9)
UB or LB
R/ W
(9)
t AS (6)
t EW (2)
t DW
t WR (3)
t DH
DATA IN
3039 drw 08
NOTES:
1. R/ W or CE or UB and LB = V IH during all address transitions.
2. A write occurs during the overlap (t EW or t WP ) of a CE = V IL and a R/ W = V IL for memory array writing cycle.
3. t WR is measured from the earlier of CE or R/ W (or SEM or R/ W ) going V IH to the end of write cycle.
4. During this period, the I/O pins are in the output state and input signals must not be applied.
5. If the CE or SEM = V IL transition occurs simultaneously with or after the R/ W = V IL transition, the outputs remain in the High-impedance state.
6. Timing depends on which enable signal is asserted last, CE or R/ W .
7. This parameter is guaranteed by device characterization, but is not production tested. Transition is measured 0mV from steady state with the Output Test Load (Figure
2).
8. If OE = V IL during R/ W controlled write cycle, the write pulse width must be the larger of t WP or (t WZ + t DW ) to allow the I/O drivers to turn off and data to be
placed on the bus for the required t DW . If OE = V IH during an R/ W controlled write cycle, this requirement does not apply and the write pulse can be as short as the
specified t WP .
9. To access RAM, CE = V IL and SEM = V IH . To access semaphore, CE = V IH and SEM = V IL . t EW must be met for either condition.
9
6.42
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