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參數資料
| 型號： | DM74AS640N |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | Replaced by SN74LVC863A : 9-Bit Bus Transceiver With 3-State Outputs 24-SOIC -40 to 85 |
| 中文描述： | AS SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, MS-001, DIP-20 |
| 文件頁數： | 1/5頁 |
| 文件大小： | 52K |
| 代理商： | DM74AS640N |
2000 Fairchild Semiconductor Corporation
DS006708
www.fairchildsemi.com
October 1986
Revised March 2000
D
DM74AS640
3-STATE Octal Bus Transceiver
General Description
This advanced Schottky device contains 8 pairs of 3-
STATE logic elements configured as octal bus transceiver.
This circuit is designed for use in memory, microprocessor
systems and in asynchronous bidirectional data buses.
This device transmits data from the A bus to the B bus, or
vice versa, depending upon the logic level of the direction
control input (DIR). The enable input (G) can be used to
disable the devices, effecting isolation of buses A and B.
The 3-STATE circuitry also contains a protection feature
that prevents these transceivers from glitching the bus dur-
ing power-up or power-down.
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 Schottky,
low power Schottky, and advanced low power Schottky
TTL counterpart
I
Improved AC performance over Schottky, low power
Schottky, and advanced low power Schottky counter-
parts
I
3-STATE outputs independently controlled on A and B
buses
I
Low output impedance drive to drive terminated trans-
mission lines to 133
I
Specified to interface with CMOS at V
OH
=
V
CC
2V
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Top View
Function Table
H
=
HIGH Logic Level
L
=
LOW Logic Level
X
=
Immaterial
Logic Diagram
Order Number
DM74AS640WM
DM74AS640N
Package Number
M20B
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Control Inputs
Operation
G
DIR
L
L
B Data to A Bus
L
H
A Data to B Bus
H
X
Isolation
相關PDF資料 |
PDF描述 |
|---|---|
| DM74AS640WM | 3-STATE Octal Bus Transceiver |
| DM74AS640WMX | Single 8-Bit Inverting Bus Transceiver |
| DM74AS648 | Octal Bus Transceiver and Register(八總線收發器和寄存器) |
| DM74AS648WM | FILTER SAW 315MHZ REMOTE SMD |
| DM74AS646 | Octal Bus Transceiver and Register |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DM74AS640WMX | 功能描述:總線收發器 Oct 3-STATE Oct Tran RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數量: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 |
| DM74AS645N | 制造商:Texas Instruments 功能描述: |
| DM74AS646_A1110562 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74AS646NT | 功能描述:總線收發器 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 |
| DM74AS646WM | 功能描述:總線收發器 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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