参数资料
型号: IDT7054S25PRF8
厂商: IDT, Integrated Device Technology Inc
文件页数: 10/11页
文件大小: 0K
描述: IC SRAM 32KBIT 25NS 128TQFP
标准包装: 1,000
格式 - 存储器: RAM
存储器类型: SRAM - 四端口,异步
存储容量: 32K (4K x 8)
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: 128-LQFP
供应商设备封装: 128-TQFP(14x20)
包装: 带卷 (TR)
其它名称: 7054S25PRF8
IDT7054S/L
High-Speed 4K x 8 FourPort? Static RAM
Military, Industrial and Commercial Temperature Ranges
Timing Waveform of Write with Port-to-Port Read (1, 2)
t WC
ADDR "A"
MATCH
t WP
R/ W "A"
t DW
t DH
DATA IN"A"
ADDR "B"
DATA "B"
NOTES:
VALID
MATCH
t WDD
t DDD
VALID
3241 drw 09
1. OE = V IL for the reading ports.
2. All timing is the same for left and right ports. Port "A" may be either of the four ports and Port "B" is any other port.
Functional Description
Table I – Read/Write Control
The IDT7054 provides four ports with separate control, address, and
I/O pins that permit independent access for reads or writes to any location
in memory. These devices have an automatic power down feature
controlled by CE . The CE controls on-chip power down circuitry
that permits the respective port to go into standby mode when not selected
( CE = V IH ). When a port is enabled, access to the entire memory array
is permitted. Each port has its own Output Enable control ( OE ). In the read
mode, the port’s OE turns on the output drivers when set LOW. READ/
WRITE conditions are illustrated in the table.
R/ W
X
X
L
H
X
CE
H
H
L
L
X
Any Port (1)
OE
X
X
X
L
H
D 0-7
Z
Z
DATA IN
DATA OUT
Z
Function
Port Deselected: Power-Down
CE P1 = CE P2 = CE P3 = CE P4 =V IH
Power Down Mode I SB or I SB1
Data on port written into memory (2)
Data in memory output on port
Outputs Disabled
3241 tbl 11
NOTES:
1. "H" = V IH , "L" = V IL , "X" = Don’t Care, "Z "= High Impedance
2. For valid write operation, no more than one port can write to the same address
location at the same time.
10
6.42
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