參數(shù)資料
型號(hào)： LM9830
廠商： National Semiconductor Corporation
英文描述： LM9830 36-Bit Color Document Scanner
中文描述： LM9830 36位彩色文件掃描儀
文件頁數(shù)： 44/45頁
文件大?。?/td> 566K
代理商： LM9830
74HCT373
To
Computer
To
Printer
D
D
5
8
LM9830
Databus
Control Signals
Printer Passthrough Block Diagram
TRISTATE
LATCH
5
5
4
4
4
BIAS
V
PASSTHROUGH
Notes:
V
PASSTHROUGH
is generated by rectifying the control outputs from the PC and printer parallel ports. If needed, the 8 bit data lines
may be rectified as well to provide additional current.
If the LM9830’s TRISTATE output is not forced to ground when the LM9830 power is off, then it needs a pulldown resistor to
ground.
The 74HCT373 needs to pass 4 lines from the PC to the printer, the 74HCT244 controls 5 lines from the printer to the PC. The
latch is needed to hold the 4 inputs to the printer in the state they were in before the LM9830 left the transparent mode. It is possi-
ble that a simple tristate buffer (74HCT244) could be used instead of the latch, with pullups/pulldowns defining the signals sent to
the printer when the LM9830 is active. It is also possible that one signal (probably INIT) could always be simultaneously connected
to the printer port and the LM9830, allowing just one 74HCT244 to implement the printer passthrough function.
The final recommended schematic for this mode is an applications issue and will be determined after testing with final silicon.
The design requirements are:
Scanner Active
PassThrough
LM9830 Power Off
TRISTATE
+5V
0V
0V (through pulldown, if necessary)
LATCH
0V
5V
5V (through pullup) (latches previous states)
D0-D7
LM9830 sends/receives
Tristate
Tristate
STROBE, AUTOFEED,
Inputs to LM9830
Tristate
Tristate
SELECT IN, INIT
ACK, BUSY, PE,
LM9830 Outputs
Tristate
Tristate
SELECT, ERROR
74HCT244
+5V from Scanner Power Supply
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM9830VJD 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 RoHS:否 制造商:Texas Instruments 輸入信號(hào)類型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel
LM9830VJD/NOPB 功能描述:視頻模擬/數(shù)字化轉(zhuǎn)換器集成電路 RoHS:否 制造商:Texas Instruments 輸入信號(hào)類型:Differential 轉(zhuǎn)換器數(shù)量:1 ADC 輸入端數(shù)量:4 轉(zhuǎn)換速率:3 Gbps 分辨率:8 bit 結(jié)構(gòu): 輸入電壓:3.3 V 接口類型:SPI 信噪比: 電壓參考: 電源電壓-最大:3.45 V 電源電壓-最小:3.15 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:TCSP-48 封裝:Reel
LM9830VJDX 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9830 36-Bit Color Document Scanner
LM9831 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner
LM9831CCVJD 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LM9831 42-Bit Color, 1200dpi USB Image Scanner
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