参数资料
型号: IDT7027S25PF
厂商: IDT, Integrated Device Technology Inc
文件页数: 4/19页
文件大小: 0K
描述: IC SRAM 512KBIT 25NS 100TQFP
标准包装: 6
格式 - 存储器: RAM
存储器类型: SRAM - 双端口,异步
存储容量: 512K (32K x 16)
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: 100-LQFP
供应商设备封装: 100-TQFP(14x14)
包装: 托盘
其它名称: 7027S25PF
IDT7027S/L
High-Speed 32K x 16 Dual-Port Static RAM
Truth Table I – Chip Enable
Industrial and Commercial Temperature Ranges
NOTES:
CE
L
H
CE 0
V IL
< 0.2V
V IH
X
>V CC - 0.2V
X
CE 1
V IH
>V CC - 0.2V
X
V IL
X
<0.2V
Mode
Port Selected (TTL Active)
Port Selected (CMOS Active)
Port Deselected (TTL Inactive)
Port Deselected (TTL Inactive)
Port Deselected (CMOS Inactive)
Port Deselected (CMOS Inactive)
3199 tbl 02
1. Chip Enable references are shown above with the actual CE 0 and CE 1 levels, CE is a reference only.
2. Port "A" and "B" references are located where CE is used.
3. "H" = V IH and "L" = V IL .
Truth Table II – Non-Contention Read/Write Control
Inputs (1)
Outputs
CE (2)
H
X
L
L
L
L
L
L
X
R/ W
X
X
L
L
L
H
H
H
X
OE
X
X
X
X
X
L
L
L
H
UB
X
H
L
H
L
L
H
L
X
LB
X
H
H
L
L
H
L
L
X
SEM
H
H
H
H
H
H
H
H
X
I/O 8-15
High-Z
High-Z
DATA IN
High-Z
DATA IN
DATA OUT
High-Z
DATA OUT
High-Z
I/O 0-7
High-Z
High-Z
High-Z
DATA IN
DATA IN
High-Z
DATA OUT
DATA OUT
High-Z
Mode
Deselected: Power-Down
Both Bytes Deselected
Write to Upper Byte Only
Write to Lower Byte Only
Write to Both Bytes
Read Upper Byte Only
Read Lower Byte Only
Read Both Bytes
Outputs Disabled
NOTES:
1. A 0L — A 14L ≠ A 0R — A 14R.
2. Refer to Chip Enable Truth Table.
Truth Table III – Semaphore Read/Write Control
3199 tbl 03
Inputs (1)
Outputs
CE
(2)
H
X
H
X
L
L
R/ W
H
H
X
X
OE
L
L
X
X
X
X
UB
X
H
X
H
L
X
LB
X
H
X
H
X
L
SEM
L
L
L
L
L
L
I/O 8-15
DATA OUT
DATA OUT
DATA IN
DATA IN
______
______
I/O 0-7
DATA OUT
DATA OUT
DATA IN
DATA IN
______
______
Mode
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Write I/O 0 into Semaphore Flag
Write I/O 0 into Semaphore Flag
Not Allowed
Not Allowed
NOTES:
1. There are eight semaphore flags written to via I/O 0 and read from all the I/Os (I/O 0 __ I/O 15 ). These eight semaphore flags are addressed by A 0 -A 2 .
2. Refer to Chip Enable Truth Table.
6.42
3199 tbl 04
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