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| 型号： | IDT72T18125L5BBI |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 19/55页 |
| 文件大小： | 0K |
| 描述： | IC FIFO 524X18 2.5V 5NS 240BGA |
| 标准包装： | 1 |
| 系列： | 72T |
| 功能： | 异步，同步 |
| 存储容量： | 9M（512K x 18） |
| 数据速率： | 10MHz |
| 访问时间： | 5ns |
| 电源电压： | 2.375 V ~ 2.625 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 240-BGA |
| 供应商设备封装： | 240-PBGA（19x19） |
| 包装： | 托盘 |
| 其它名称： | 72T18125L5BBI 800-2331 IDT72T18125L5BBI-ND |
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26
COMMERCIALANDINDUSTRIAL
TEMPERATURERANGES
IDT72T1845/55/65/75/85/95/105/115/125 2.5V TeraSync 18-BIT/9-BIT FIFO 2Kx18/4Kx9, 4Kx18/
8Kx9, 8Kx18/16Kx9, 16Kx18/32Kx9, 32Kx18/64Kx9, 64Kx18/128Kx9, 128Kx18/256Kx9, 256Kx18/512Kx9, 512Kx18/1Mx9
FEBRUARY 10, 2009
programmingoftheoffsets.(D8becomesavalidbit).Additionally,outputQ8will
become a valid bit when performing a read of the offset register. IP mode is
selected during Master Reset by the state of the IP input pin.
OUTPUTS:
FULL FLAG (
FF/IR)
Thisisadualpurposepin.InIDTStandardmode,theFullFlag(
FF)function
is selected. When the FIFO is full,
FF will go LOW, inhibiting further write
operations. When
FF is HIGH, the FIFO is not full. If no reads are performed
after a reset (either
MRS or PRS), FF will go LOW after D writes to the FIFO.
If x18 Input or x18 Output bus Width is selected, D = 2,048 for the IDT72T1845,
4,096 for the IDT72T1855, 8,192 for the IDT72T1865, 16,384 for the
IDT72T1875, 32,768 for the IDT72T1885, 65,536 for the IDT72T1895,
131,072writesfortheIDT72T18105,262,144writesfortheIDT72T18115and
524,288writesfortheIDT72T18125.Ifbothx9Inputandx9OutputbusWidths
are selected, D = 4,096 for the IDT72T1845, 8,192 for the IDT72T1855,
16,384 for the IDT72T1865, 32,768 for the IDT72T1875, 65,536 for the
IDT72T1885, 131,072 for the IDT72T1895, 262,144 writes for the
IDT72T18105, 524,288 writes for the IDT72T18115 and 1,048,576 writes for
the IDT72T18125. See Figure 11, Write Cycle and Full Flag Timing (IDT
Standard Mode), for the relevant timing information.
In FWFT mode, the Input Ready (
IR) function is selected. IR goes LOW
when memory space is available for writing in data. When there is no longer
anyfreespaceleft,
IRgoesHIGH,inhibitingfurtherwriteoperations.Ifnoreads
are performed after a reset (either
MRSorPRS),IRwillgoHIGHafterD writes
to the FIFO. If x18 Input or x18 Output bus Width is selected, D = 2,049 for the
IDT72T1845, 4,097 for the IDT72T1855, 8,193 for the IDT72T1865, 16,385
for the IDT72T1875, 32,769 for the IDT72T1885, 65,537 for the IDT72T1895,
131,073writesfortheIDT72T18105,262,145writesfortheIDT72T18115and
524,289writesfortheIDT72T18125.Ifbothx9Inputandx9OutputbusWidths
areselected,D=4,097fortheIDT72T1845,8,193fortheIDT72T1855,16,385
for the IDT72T1865, 32,769 for the IDT72T1875, 65,537 for the IDT72T1885,
131,073 for the IDT72T1895, 262,145 writes for the IDT72T18105, 524,289
writes for the IDT72T18115 and 1,048,577 writes for the IDT72T18125. See
Figure 14, Write Timing (FWFT Mode), for the relevant timing information.
The
IRstatusnotonlymeasuresthecontentsoftheFIFOmemory,butalso
counts the presence of a word in the output register. Thus, in FWFT mode, the
total number of writes necessary to deassert
IR isonegreaterthanneededto
assert
FF in IDT Standard mode.
FF/IRissynchronousandupdatedontherisingedgeofWCLK.FF/IRare
double register-buffered outputs.
Note,whenthedeviceisinRetransmitmode,thisflagisacomparisonofthe
write pointer to the ‘marked’ location. This differs from normal mode where this
flag is a comparison of the write pointer to the read pointer.
EMPTY FLAG (
EF/OR)
This is a dual purpose pin. In the IDT Standard mode, the Empty Flag (
EF)
function is selected. When the FIFO is empty,
EFwillgoLOW,inhibitingfurther
readoperations.When
EFisHIGH,theFIFOisnotempty.SeeFigure12,Read
Cycle, Empty Flag and First Word Latency Timing (IDT Standard Mode), for
therelevanttiminginformation.
InFWFTmode,theOutputReady(
OR)functionisselected.ORgoesLOW
at the same time that the first word written to an empty FIFO appears valid on
theoutputs.
ORstaysLOWaftertheRCLKLOWtoHIGHtransitionthatshiftsthe
last word from the FIFO memory to the outputs.
ORgoesHIGHonlywithatrue
read(RCLKwith
REN=LOW).Thepreviousdatastaysattheoutputs,indicating
the last word was read. Further data reads are inhibited until
OR goes LOW
again. See Figure 15, Read Timing (FWFT Mode), for the relevant timing
information.
EF/OR is synchronous and updated on the rising edge of RCLK.
In IDT Standard mode,
EF is a double register-buffered output. In FWFT
mode,
OR isatripleregister-bufferedoutput.
PROGRAMMABLE ALMOST-FULL FLAG (
PAF)
The Programmable Almost-Full flag (
PAF) will go LOW when the FIFO
reaches the almost-full condition. In IDT Standard mode, if no reads are
performed after reset (
MRS), PAF will go LOW after (D-m) words are written
totheFIFO.Ifx18Inputorx18OutputbusWidthisselected,(D-m) = (2,048-m)
writes for the IDT72T1845, (4,096-m) writes for the IDT72T1855, (8,192-m)
writes for the IDT72T1865, (16,384-m) writes for the IDT72T1875, (32,768-m)
writesfortheIDT72T1885,(65,536-m)writesfortheIDT72T1895,(131,072-m)
writes for the IDT72T18105, (262,144-m) writes for the IDT72T18115 and
(524,288-m) writes for the IDT72T18125. If both x9 Input and x9 Output bus
Widths are selected, (D-m) = (4,096-m) writes for the IDT72T1845, (8,192-m)
writes for the IDT72T1855, (16,384-m) writes for the IDT72T1865, (32,768-m)
writesfortheIDT72T1875,(65,536-m)writesfortheIDT72T1885,(131,072-m)
writes for the IDT72T1895, (262,144-m) writes for the IDT72T18105,
(524,288-m) writes for the IDT72T18115 and (1,048,576-m) writes for the
IDT72T18125. The offset “m” is the full offset value. The default setting for this
value is stated in Table 2.
In FWFT mode, if x18 Input or x18 Output bus Width is selected, the
PAF
willgoLOWafter(2,049-m)writesfortheIDT72T1845,(4,097-m)writesforthe
IDT72T1855, (8,193-m) writes for the IDT72T1865, (16,385-m) writes for the
IDT72T1875, (32,769-m) writes for the IDT72T1885, (65,537-m) writes for the
IDT72T1895, (131,073-m) writes for the IDT72T18105, (262,145-m) writes
for the IDT72T18115 and (524,289-m) writes for the IDT72T18125. If both x9
Inputandx9OutputbusWidthsareselected,the
PAFwillgoLOWafter(4,097-
m)writesfortheIDT72T1845,(8,193-m)writesfortheIDT72T1855,(16,385-m)
writes for the IDT72T1865, (32,769-m) writes for the IDT72T1875, (65,537-m)
writes for the IDT72T1885, (131,073-m) writes for the IDT72T1895, (262,145-
m) writes for the IDT72T18105, (524,289-m) writes for the IDT72T18115
and (1,048,577-m) writes for the IDT72T18125. The offset m is the full offset
value. The default setting for this value is stated in Table 2.
See Figure 23, Synchronous Programmable Almost-Full Flag Timing (IDT
Standard and FWFT Mode), for the relevant timing information.
If asynchronous
PAF configuration is selected, thePAF is asserted LOW
ontheLOW-to-HIGHtransitionoftheWriteClock(WCLK).
PAFisresettoHIGH
ontheLOW-to-HIGHtransitionoftheReadClock(RCLK).Ifsynchronous
PAF
configuration is selected, the
PAFisupdatedontherisingedgeofWCLK.See
Figure 25 for Asynchronous Programmable Almost-Full Flag Timing (IDT
Standard and FWFT Mode).
Note,whenthedeviceisinRetransmitmode,thisflagisacomparisonofthe
write pointer to the ‘marked’ location. This differs from normal mode where this
flag is a comparison of the write pointer to the read pointer.
PROGRAMMABLE ALMOST-EMPTY FLAG (
PAE)
The Programmable Almost-Empty flag (
PAE)willgoLOWwhentheFIFO
reaches the almost-empty condition. In IDT Standard mode, PAE will go LOW
when there are n words or less in the FIFO. The offset “n” is the empty offset
value. The default setting for this value is stated in Table 2.
In FWFT mode, the
PAE will go LOW when there are n+1 words or less
in the FIFO. The default setting for this value is stated in Table 2.
See Figure 24, Synchronous Programmable Almost-Empty Flag Timing
(IDT Standard and FWFT Mode), for the relevant timing information.
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| IDT72T18125L6-7BB | 功能描述:IC FIFO 524X18 2.5V 6-7NS 240BGA RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72T 标准包装:15 系列:74F 功能:异步 存储容量:256（64 x 4） 数据速率:- 访问时间:- 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:24-DIP（0.300"，7.62mm） 供应商设备封装:24-PDIP 包装:管件 其它名称:74F433 |
| IDT72T1845L4-4BB | 功能描述:IC FIFO 2048X18 2.5V 4NS 240BGA RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72T 标准包装:90 系列:7200 功能:同步 存储容量:288K（16K x 18） 数据速率:100MHz 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（14x14） 包装:托盘 其它名称:72271LA10PF |
| IDT72T1845L5BB | 功能描述:IC FIFO 2048X18 2.5V 5NS 144BGA RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72T 标准包装:90 系列:7200 功能:同步 存储容量:288K（16K x 18） 数据速率:100MHz 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（14x14） 包装:托盘 其它名称:72271LA10PF |
| IDT72T1845L5BBI | 功能描述:IC FIFO 2048X18 2.5V 5NS 144BGA RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72T 标准包装:90 系列:7200 功能:同步 存储容量:288K（16K x 18） 数据速率:100MHz 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（14x14） 包装:托盘 其它名称:72271LA10PF |
| IDT72T1845L6-7BB | 功能描述:IC FIFO 2048X18 6-7NS 144BGA RoHS:否 类别:集成电路 (IC) >> 逻辑 - FIFO 系列:72T 标准包装:90 系列:7200 功能:同步 存储容量:288K（16K x 18） 数据速率:100MHz 访问时间:10ns 电源电压:4.5 V ~ 5.5 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:64-LQFP 供应商设备封装:64-TQFP（14x14） 包装:托盘 其它名称:72271LA10PF |
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