參數(shù)資料
型號(hào): SN74ACT7804DL
廠商: Texas Instruments, Inc.
英文描述: 512 】 18 STROBED FIRST-IN, FIRST-OUT MEMORY
中文描述: 512】18選通先入先出存儲(chǔ)器
文件頁(yè)數(shù): 4/11頁(yè)
文件大?。?/td> 146K
代理商: SN74ACT7804DL
SN74ACT7804
512
×
18 STROBED FIRST-IN, FIRST-OUT MEMORY
SCAS204C – APRIL 1992 – REVISED APRIL 1998
4
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. The AF/AE
flag is high when the FIFO contains X or fewer words or (512 – Y) or more words.
To program the offset values, PEN can be brought low after reset only when LDCK is low. On the following
low-to-high transition of LDCK, 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 LDCK reprograms Y to the
binary value on D0–D7 at the time of the second LDCK low-to-high transition. Writes to the FIFO memory are
disabled while the offsets are programmed. A maximum value of 255 can be programmed for either X or Y (see
Figure 1). To use the default values of X = Y = 64, PEN must be held high.
ììììì
ììììì
RESET
X and Y
Y
PEN
D0–D7
EMPTY
LDCK
Figure 1. Programming X and Y Separately
相關(guān)PDF資料
PDF描述
SN74ACT7805DL 256 】 18 CLOCKED FIRST-IN, FIRST-OUT MEMORY
SN74ACT7806DL 256 】 18 STROBED FIRST-IN, FIRST-OUT MEMORY
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SN74ACT7805-15DLR 功能描述:先進(jìn)先出 256 x 18 synchronous 先進(jìn)先出 memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線(xiàn)寬度:18 bit 總線(xiàn)定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類(lèi)型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪(fǎng)問(wèn)時(shí)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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SN74ACT7805-20DLR 功能描述:先進(jìn)先出 256 x 18 synchronous 先進(jìn)先出 memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線(xiàn)寬度:18 bit 總線(xiàn)定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類(lèi)型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪(fǎng)問(wèn)時(shí)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:
SN74ACT7805-25DL 功能描述:先進(jìn)先出 256 x 18 synchronous 先進(jìn)先出 memory RoHS:否 制造商:IDT 電路數(shù)量: 數(shù)據(jù)總線(xiàn)寬度:18 bit 總線(xiàn)定向:Unidirectional 存儲(chǔ)容量:4 Mbit 定時(shí)類(lèi)型:Synchronous 組織:256 K x 18 最大時(shí)鐘頻率:100 MHz 訪(fǎng)問(wèn)時(shí)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: