参数资料
型号: IDT70914S25PF8
厂商: IDT, Integrated Device Technology Inc
文件页数: 10/11页
文件大小: 0K
描述: IC SRAM 36KBIT 25NS 80TQFP
标准包装: 750
格式 - 存储器: RAM
存储器类型: SRAM - 双端口,同步
存储容量: 36K(4K x 9)
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: 80-LQFP
供应商设备封装: 80-TQFP(14x14)
包装: 带卷 (TR)
其它名称: 70914S25PF8
IDT70914S
High-Speed 36K (4K x 9) Synchronous Dual-Port Static RAM
Functional Description
The IDT70914 provides a true synchronous Dual-Port Static RAM
interface. Registered inputs provide very short set-up and hold times on
address, data, and all critical control inputs. All internal registers are clocked
on the rising edge of the clock signal. An asynchronous output enable is
provided to ease asynchronous bus interfacing.
The internal write pulse width is dependent on the LOW to HIGH
Truth Table I: Read/Write Control (1)
Military, Industrial and Commercial Temperature Ranges
transitions of the clock signal allowing the shortest possible realized cycle
times. Clock enable inputs are provided to stall the operation of the address
and data input registers without introducing clock skew for very fast
interleaved memory applications.
A HIGH on the CE input for one clock cycle will power down the
internal circuitry to reduce static power consumption.
Synchronous
(3)
Inputs
Asynchronous
Outputs
CLK
CE
H
L
L
X
R/ W
X
L
H
X
OE
X
X
L
H
I/O 0-8
High-Z
DATA IN
DATA OUT
High-Z
Mode
Deselected, Power-Down
Selected and Write Enabled
Read Selected and Data Output Enable Read
Outputs Disabled
3490 tbl 09
Truth Table II: Clock Enable Function Table (1)
Inputs
Register Inputs
Register Outputs (4)
Mode
Load "1"
Load "0"
Hold (do nothing)
CLK (3)
X
CLKEN (2)
L
L
H
H
ADDR
H
L
X
X
DATAIN
H
L
X
X
ADDR
H
L
NC
NC
DATAOUT
H
L
NC
NC
NOTES:
3490 tbl 10
1. 'H' = HIGH voltage level steady state, 'h' = HIGH voltage level one set-up time prior to the LOW-to-HIGH clock transition, 'L' = LOW voltage level steady state 'l' = LOW
voltage level one set-up time prior to the LOW-to-HIGH clock transition, 'X' = Don't care, 'NC' = No change
2. CLKEN = V IL must be clocked in during Power-Up.
3. Control signals are initialted and terminated on the rising edge of the CLK, depending on their input level. When R/ W and CE are LOW, a write cycle is initiated on
the LOW-to-HIGH transition of the CLK. Termination of a write cycle is done on the next LOW-to-HIGH transistion of the CLK.
4. The register outputs are internal signals from the register inputs being clocked in or disabled by CLKEN .
10
6.42
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