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參數(shù)資料
| 型號(hào)： | MAX7300ANI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 11/22頁(yè) |
| 文件大?。?/td> | 348K |
| 代理商： | MAX7300ANI |
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M
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
______________________________________________________________________________________
11
The MAX7300 maintains an internal 7-bit snapshot reg-
ister to hold the comparison copy of the logic states of
ports P24 to P30. The snapshot register is updated with
the condition of P24 to P31 whenever the configuration
register is written with the M bit set. The update action
occurs regardless of the previous state of the M bit so
that it is not necessary to clear the M bit and then reset
it in order to update the snapshot register.
When the data change detection bit is set, the MAX7300
continuously compares the snapshot register against
the changing states of P24 to P31. When a difference
occurs, the IRQ bit (mask register bit D7) is set and IRQ
port P31 goes high if it is configured as an output.
The IRQ bit and IRQ output remain set until the mask
register is next read or written, so if the IRQ is set, then
the mask register reads with bit D7 set. Writing the
mask register clears the IRQ bit and resets the IRQ out-
put, regardless of the value of bit D7 written.
External Component R
ISET
The MAX7300 uses an external resistor, R
ISET,
to set
internal biasing. Use a resistor value of 39k
.
Applications Information
Low-Voltage Operation
The MAX7300 operates down to 2V supply voltage
(although the sourcing and sinking currents are not
guaranteed), providing that the MAX7300 is powered up
initially to at least 2.5V to trigger the device
’
s internal
reset.
Power-Supply Considerations
The MAX7300 operates with power-supply voltages of
2.5V to 5.5V. Bypass the power supply to GND with a
0.047μF capacitor as close to the device as possible.
Add a 1μF capacitor if the MAX7300 is far away from
the board
’
s input bulk decoupling capacitor.
Chip Information
TRANSISTOR COUNT: 33,559
PROCESS: CMOS
S
A
A
P
0
SLAVE ADDRESS
COMMAND BYTE
ACKNOWLEDGE FROM MAX7300
R/W
ACKNOWLEDGE FROM MAX7300
D15 D14 D13 D12 D11 D10
D9
D8
COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION
Figure 7. Command Byte Received
S
A
A
A
P
0
SLAVE ADDRESS
COMMAND BYTE
DATA BYTE
ACKNOWLEDGE FROM MAX7300
1 BYTE
AUTOINCREMENT MEMORY WORD ADDRESS
D15 D14
D13 D12
D11 D10
D9
D8
D1
D0
D3
D2
D5
D4
D7
D6
HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX7300’s REGISTER
ACKNOWLEDGE FROM MAX7300
ACKNOWLEDGE FROM MAX7300
R/W
Figure 8. Command and Single Data Byte Received
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7300ANI+ | 功能描述:接口-I/O擴(kuò)展器 Integrated Circuits (ICs) RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7300ATI | 功能描述:接口-I/O擴(kuò)展器 RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7300ATI+ | 功能描述:接口-I/O擴(kuò)展器 2Wire 2.5-5.5V 20/28Port I/Ox RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MAX7300ATI+T | 制造商:Maxim Integrated Products 功能描述:MAX7300ATI+T |
| MAX7300ATI-T | 功能描述:接口-I/O擴(kuò)展器 RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
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