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參數(shù)資料
| 型號： | IDT72V831L20PF8 |
| 廠商： | IDT, Integrated Device Technology Inc |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SYNC FIFO 2048X9 20NS 64QFP |
| 標(biāo)準(zhǔn)包裝： | 750 |
| 系列： | 72V |
| 功能： | 異步 |
| 存儲容量： | 18.4K（2K x 9） |
| 數(shù)據(jù)速率： | 50MHz |
| 訪問時間： | 20ns |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-LQFP |
| 供應(yīng)商設(shè)備封裝： | 64-TQFP（14x14） |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | 72V831L20PF8 |
3
IDT72V801/72V8211/72V821/72V831/72V841/72V851 3.3V DUAL CMOS SyncFIFOTM
DUAL 256 x 9, DUAL 512 x 9, DUAL 1K x 9, DUAL 2K x 9, DUAL 4K x 9, DUAL 8K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
OCTOBER 22, 2008
PIN DESCRIPTIONS
The IDT72V801/72V811/72V821/72V831/72V841/72V851's two FIFOs,
referred to as FIFO A and FIFO B, are identical in every respect. The following
description defines the input and output signals for FIFO A. The corresponding
signal names for FIFO B are provided in parentheses.
Symbol
Name
I/O
Description
DA0-DA8
A Data Inputs
I
9-bit data inputs to RAM array A.
DB0-DB8
B Data Inputs
I
9-bit data inputs to RAM array B.
RSA, RSB
Reset
I
When
RSA (RSB) is set LOW, the associated internal read and write pointers of array A (B) are set to the first
location;
FFA (FFB) and PAFA (PAFB) go HIGH, and PAEA (PAEB) and EFA (EFB) go LOW. After power-
up, a reset of both FIFOs A and B is required before an initial WRITE.
WCLKA
Write Clock
I
Data is written into the FIFO A (B) on a LOW-to-HIGH transition of WCLKA (WCLKB) when the write enable(s)
WCLKB
are asserted.
WENA1
Write Enable 1
I
If FIFO A (B) is configured to have programmable flags,
WENA1 (WENB1) is the only write enable pin that can be
WENB1
used. When
WENA1 (WENB1) is LOW, data A (B) is written into the FIFO on every LOW-to-HIGH transition
WCLKA (WCLKB). If the FIFO is configured to have two write enables,
WENA1 (WENB1) must be LOW and
WENA2 (WENB2) must be HIGH to write data into the FIFO. Data will not be written into the FIFO if
FFA (FFB) is
LOW.
WENA2/
LDA
Write Enable 2/
I
FIFO A (B) is configured at reset to have either two write enables or programmable flags. If
LDA (LDB) is HIGH at
WENB2/
LDB
Load
reset, this pin operates as a second Write Enable. If WENA2/
LDA (WENB2/LDB) is LOW at reset this pin operates
as a control to load and read the programmable flag offsets for its respective array. If the FIFO is configured to have
two write enables,
WENA1 (WENB1) must be LOW and WENA2 (WENB2) must be HIGH to write data into FIFO
A (B). Data will not be written into FIFO A (B) if
FFA (FFB) is LOW. If the FIFO is configured to have programmable
flags,
LDA(LDB) is held LOW to write or read the programmable flag offsets.
QA0-QA8
A Data Outputs
O
9-bit data outputs from RAM array A.
QB0-QB8
B Data Outputs
O
9-bit data outputs from RAM array B.
RCLKA
Read Clock
I
Data is read from FIFO A (B) on a LOW-to-HIGH transition of RCLKA (RCLKB) when
RENA1(RENB1) and
RCLKB
RENA2 (RENB2) are asserted.
RENA1
Read Enable 1
I
When
RENA1 (RENB1) and RENA2 (RENB2) are LOW, data is read from FIFO A (B) on every LOW-to-HIGH
RENB1
transition of RCLKA (RCLKB). Data will not be read from Array A (B) if
EFA (EFB) is LOW.
RENA2
Read Enable 2
I
When
RENA1 (RENB1) and RENA2 (RENB2) are LOW, data is read from the FIFO A (B) on every LOW-to-
RENB2
HIGH transition of RCLKA (RCLKB). Data will not be read from array A (B) if the
EFA (EFB) is LOW.
OEA
Output Enable
I
When
OEA (OEB) is LOW, outputs DA0-DA8 (DB0-DB8) are active. If OEA (OEB) is HIGH, the OEB outputs DA0-
DA8 (DB0-DB8) will be in a high-impedance state.
EFA
Empty Flag
O
When
EFA (EFB) is LOW, FIFO A (B) is empty and further data reads from the output are inhibited. When EFA
EFB
(
EFB) is HIGH, FIFO A (B) is not empty. EFA (EFB) is synchronized to RCLKA (RCLKB).
PAEA
Programmable
O
When
PAEA (PAEB) is LOW, FIFO A (B) is Almost-Empty based on the offset programmed into the appropriate
PAEB
Almost-Empty Flag
offset register. The default offset at reset is Empty+7.
PAEA (PAEB) is synchronized to RCLKA (RCLKB).
PAFA
Programmable
O
When
PAFA(PAFB) is LOW, FIFO A (B) is Almost-Full based on the offset programmed into the appropriate offset
PAFB
Almost-Full Flag
register. The default offset at reset is Full-7.
PAFA (PAFB) is synchronized to WCLKA (WCLKB).
FFA
Full Flag
O
When
FFA (FFB) is LOW, FIFO A (B) is full and further data writes into the input are inhibited. When FFA (FFB) is
FFB
HIGH, FIFO A (B) is not full.
FFA (FFB) is synchronized to WCLKA (WCLKB).
VCC
Power
+3.3V power supply pin.
GND
Ground
0V ground pin.
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