参数资料
型号: IDT7133LA25JGI8
厂商: IDT, Integrated Device Technology Inc
文件页数: 11/17页
文件大小: 0K
描述: IC SRAM 32KBIT 25NS 68PLCC
标准包装: 250
格式 - 存储器: RAM
存储器类型: SRAM - 双端口,异步
存储容量: 32K(2K x 16)
速度: 25ns
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: 68-LCC(J 形引线)
供应商设备封装: 68-PLCC(24x24)
包装: 带卷 (TR)
其它名称: 7133LA25JGI8
IDT7133SA/LA, IDT7143SA/LA
High-Speed 2K x 16 Dual-Port RAM
Military, Industrial and Commercial Temperature Ranges
Timing Waveform of Write Cycle No. 1 (R/ W Controlled Timing) (1,5,8)
t WC
ADDRESS
OE
CE
t AS
(6)
t AW
t WR (3)
R/ W
(9)
t WP (2)
t HZ
(7)
DATA OUT
t LZ
(4)
t WZ (7)
t DW
t OW
t DH
(4)
t HZ (7)
DATA IN
2746 drw 09
Write Cycle No. 2 ( CE Controlled Timing) (1,5)
t WC
ADDRESS
t AW
CE
R/ W
(9)
t AS (6)
t EW (2)
t DW
t DH
t WR
DATA IN
2746 drw 10
NOTES:
1. R/ W or CE must be HIGH 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 .
3. t WR is measured from the earlier of CE or R/ W going HIGH to the end of the 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 LOW transition occurs simultaneously with or after the R/ W LOW transition, the outputs remain in the High-impedance state.
6. Timing depends on which enable signal ( CE or R/ W ) is asserted last.
7. Timing depends on which enable signal is de-asserted first, CE or OE .
8. If OE is LOW during a 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 is HIGH 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. R/ W for either upper or lower byte.
11
6.42
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