参数资料
型号: IDT71V3558S166PFGI8
厂商: IDT, Integrated Device Technology Inc
文件页数: 9/28页
文件大小: 0K
描述: IC SRAM 4MBIT 166MHZ 100TQFP
标准包装: 1,000
格式 - 存储器: RAM
存储器类型: SRAM - 同步 ZBT
存储容量: 4.5M(256K x 18)
速度: 166MHz
接口: 并联
电源电压: 3.135 V ~ 3.465 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: 带卷 (TR)
其它名称: 71V3558S166PFGI8
IDT71V3556, IDT71V3558, 128K x 36, 256K x 18, 3.3V Synchronous SRAMS with
ZBT ? Feature, 3.3V I/O, Burst Counter, and Pipelined Outputs
Commercial and Industrial Temperature Ranges
Synchronous Truth Table
(1)
CEN
R/ W
Chip (5)
ADV/ LD
BW x
ADDRESS
PREVIOUS CYCLE
CURRENT CYCLE
I/O
Enable
USED
(2 cycles later)
L
L
L
L
L
L
H
L
H
X
X
X
X
X
Select
Select
X
X
Deselect
X
X
L
L
H
H
L
H
X
Valid
X
Valid
X
X
X
X
External
External
Internal
Internal
X
X
X
X
X
LOAD WRITE /
BURST WRITE
LOAD READ /
BURST READ
X
DESELECT / NOOP
X
LOAD WRITE
LOAD READ
BURST WRITE
(Advance burst counter) (2)
BURST READ
(Advance burst counter) (2)
DESELECT or STOP (3)
NOOP
SUSPEND (4)
D (7)
Q (7)
D (7)
Q (7)
HiZ
HiZ
Previous Value
NOTES:
5281 tbl 08
1. L = V IL , H = V IH , X = Don’t Care.
2. When ADV/ LD signal is sampled high, the internal burst counter is incremented. The R/ W signal is ignored when the counter is advanced. Therefore the nature of the burst
cycle (Read or Write) is determined by the status of the R/ W signal when the first address is loaded at the beginning of the burst cycle.
3. Deselect cycle is initiated when either ( CE 1 , or CE 2 is sampled high or CE 2 is sampled low) and ADV/ LD is sampled low at rising edge of clock. The data bus will tri-state
two cycles after deselect is initiated.
4. When CEN is sampled high at the rising edge of clock, that clock edge is blocked from propogating through the part. The state of all the internal registers and the I/Os remains
unchanged.
5. To select the chip requires CE 1 = L, CE 2 = L, CE 2 = H on these chip enables. Chip is deselected if any one of the chip enables is false.
6. Device Outputs are ensured to be in High-Z after the first rising edge of clock upon power-up.
7. Q - Data read from the device, D - data written to the device.
Partial Truth Table for Writes
(1)
READ
WRITE ALL BYTES
OPERATION
R/ W
H
L
BW 1
X
L
BW 2
X
L
BW 3 (3)
X
L
BW 4 (3)
X
L
WRITE BYTE 1 (I/O[0:7], I/O P1 )
(2)
L
L
H
H
H
WRITE BYTE 3 (I/O[16:23], I/O P3 )
WRITE BYTE 4 (I/O[24:31], I/O P4 )
WRITE BYTE 2 (I/O[8:15], I/O P2 ) (2)
(2,3)
(2,3)
NO WRITE
L
L
L
L
H
H
H
H
L
H
H
H
H
L
H
H
H
H
L
H
NOTES:
1. L = V IL , H = V IH , X = Don’t Care.
2. Multiple bytes may be selected during the same cycle.
3. N/A for X18 configuration.
9
6.42
5281 tbl 09
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