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參數(shù)資料
| 型號： | SN74ACT7803DL |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 512 ?18 CLOCKED FIRST-IN, FIRST-OUT MEMORY |
| 中文描述： | 512？18時鐘先入先出存儲器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 241K |
| 代理商： | SN74ACT7803DL |
SN74ACT7803
512
×
18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SCAS191C – MARCH 1991 – REVISED APRIL 1998
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
offset values for AF/AE
The AF/AE flag has two programmable limits: the almost-empty offset value (X) and the almost-full offset
value (Y). They can be programmed after the FIFO is reset and before the first word is written to memory. If the
offsets are not programmed, the default values of X = Y = 64 are used. The AF/AE flag is high when the FIFO
contains X or fewer words or (512 – Y) or more words.
Program enable (PEN) should be held high throughout the reset cycle. PEN can be brought low only when IR
is high and WRTCLK is low. On the following low-to-high transition of WRTCLK, the binary value on D0–D7 is
stored as the almost-empty offset value (X) and the almost-full offset value (Y). Holding PEN low for another
low-to-high transition of WRTCLK reprograms Y to the binary value on D0–D7 at the time of the second
WRTCLK low-to-high transition. When the offsets are being programmed, writes to the FIFO memory are
disabled, regardless of the state of the write enables (WRTEN1, WRTEN2). A maximum value of 255 can be
programmed for either X or Y (see Figure 4). To use the default values of X = Y = 64, PEN must be held high.
Figure 4. Programming X and Y Separately
3
4
RESET
WRTCLK
PEN
WRTEN1
WRTEN2
D0–D7
IR
X and Y
Y
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
CC
Input voltage range, V
I
Voltage range applied to a disabled 3-state output
Package thermal impedance,
θ
JA
(see Note 1)
Storage temperature range, T
stg
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The package thermal impedance is calculated in accordance with JESD 51.
–0.5 V to 7 V
–0.5 V to 7 V
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.5 V
74
°
C/W
–65
°
C to 150
°
C
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SN74ACT7804-20DL | 功能描述:先進(jìn)先出 512 x 18 asynch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲容量:4 Mbit 定時類型:Synchronous 組織:256 K x 18 最大時鐘頻率:100 MHz 訪問時間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝: |
| SN74ACT7804-20DLR | 功能描述:先進(jìn)先出 512 x 18 asynch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲容量:4 Mbit 定時類型:Synchronous 組織:256 K x 18 最大時鐘頻率:100 MHz 訪問時間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝: |
| SN74ACT7804-25DL | 功能描述:先進(jìn)先出 512 x 18 asynch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲容量:4 Mbit 定時類型:Synchronous 組織:256 K x 18 最大時鐘頻率:100 MHz 訪問時間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝: |
| SN74ACT7804-25DLR | 功能描述:先進(jìn)先出 512 x 18 asynch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲容量:4 Mbit 定時類型:Synchronous 組織:256 K x 18 最大時鐘頻率:100 MHz 訪問時間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝: |
| SN74ACT7804-40DL | 功能描述:先進(jìn)先出 512 x 18 asynch 先進(jìn)先出 Memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線寬度:18 bit 總線定向:Unidirectional 存儲容量:4 Mbit 定時類型:Synchronous 組織:256 K x 18 最大時鐘頻率:100 MHz 訪問時間:10 ns 電源電壓-最大:3.6 V 電源電壓-最小:6 V 最大工作電流:35 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-80 封裝: |
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