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參數(shù)資料
| 型號： | DM74AS646NT |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Octal Bus Transceiver and Register |
| 中文描述： | AS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001, DIP-24 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 82K |
| 代理商： | DM74AS646NT |
2000 Fairchild Semiconductor Corporation
DS006324
www.fairchildsemi.com
October 1986
Revised March 2000
D
DM74AS646 DM74AS648
Octal Bus Transceiver and Register
General Description
This device incorporates an octal bus transceiver and an
octal D-type register configured to enable multiplexed
transmission of data from bus to bus or internal register to
bus.
This bus transceiver features totem-pole 3-STATE outputs
designed specifically for driving highly-capacitive or rela-
tively low-impedance loads. The high-impedance third
state and increased high-logic-level drive provide this
device with the capability of being connected directly to and
driving the bus lines in a bus-organized system without
need for interface or pull-up components. It is particularly
attractive for implementing buffer registers, I/O ports, bidi-
rectional bus drivers, and working registers.
The registers in the DM74AS646, DM74AS648 are edge-
triggered D-type flip-flops. On the positive transition of the
clock (CAB or CBA), the input bus data is stored.
The SAB and SBA control pins are provided to select
whether real-time data or stored data is transferred. A LOW
input level selects real-time data, and a HIGH level selects
stored data. The select controls have a “make before
break” configuration to eliminate a glitch which would nor-
mally occur in a typical multiplexer during the transition
between stored and real-time data.
The enable G and direction control pins provide four modes
of operation; real-time data transfer from bus A to B, real-
time data transfer from bus B to A, real-time bus A and/or B
data transfer to internal storage, or internal store data
transfer to bus A or B.
When the enable G pin is LOW, the direction pin selects
which bus receives data. When the enable G pin is HIGH,
both buses become disabled yet their input function is still
enabled.
Features
I
Switching specifications at 50 pF
I
Switching specifications guaranteed over full tempera-
ture and V
CC
range
I
Advanced oxide-isolated, ion-implanted Schottky TTL
process
I
Functionally and pin-for-pin compatible with LS TTL
counterpart
I
3-STATE buffer-type outputs drive bus lines directly
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Order Number
DM74AS646WM
DM74AS646NT
DM74AS648WM
DM74AS648NT
Package Number
M24B
N24C
M24B
N24C
Package Description
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide
24-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
24-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-100, 0.300 Wide
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM74AS646WM | 功能描述:總線收發(fā)器 Oct 3-STATE Bus Reg RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| DM74AS646WMX | 功能描述:總線收發(fā)器 Oct 3-STATE Bus Reg RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| DM74AS648NT | 功能描述:總線收發(fā)器 Oct 3-STATE Bus Reg RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| DM74AS648WM | 功能描述:總線收發(fā)器 Oct 3-STATE Bus Reg RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| DM74AS648WMX | 功能描述:總線收發(fā)器 Oct 3-STATE Bus Reg RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
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