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参数资料
| 型号： | SN74ALS621A-1NSRE4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 总线收发器 |
| 英文描述： | ALS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| 封装： | GREEN, PLASTIC, SO-20 |
| 文件页数： | 1/18页 |
| 文件大小： | 566K |
| 代理商： | SN74ALS621A-1NSRE4 |
SN74ALS620A, SN74ALS621A, SN74ALS623A, SN74AS623
OCTAL BUS TRANSCEIVERS
SDAS226A – DECEMBER 1982 – REVISED JANUARY 1995
Copyright
1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Local Bus-Latch Capability
Choice of True or Inverting Logic
Package Options Include Plastic
Small-Outline (DW) Packages and Standard
Plastic (N) 300-mil DIPs
DEVICE
OUTPUT
LOGIC
SN74ALS620A
3 state
Inverting
SN74ALS621A
Open collector
True
SN74ALS623A, SN74AS623
3 state
True
description
These octal bus transceivers are designed for asynchronous two-way communication between data buses. The
control-function implementation allows for maximum flexibility in timing.
These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus, depending
upon the logic levels at the output-enable (OEAB and OEBA) inputs.
The output-enable inputs disable the device so that the buses are effectively isolated. The dual-enable
configuration gives the transceivers the capability to store data by simultaneously enabling OEAB and OEBA.
Each output reinforces its input in this transceiver configuration. When both OEAB and OEBA are enabled and
all other data sources to the two sets of bus lines are in the high-impedance state, both sets of bus lines (16 total)
remain at their last states. The 8-bit codes appearing on the two sets of buses are identical for the
SN74ALS621A, SN74ALS623A, and SN74AS623 or complementary for the SN74ALS620A.
The -1 versions of the SN74ALS620A and SN74ALS621A are identical to the standard versions, except that
the recommended maximum IOL is increased to 48 mA in the -1 versions.
The SN74ALS620A, SN74ALS621A, SN74ALS623A, and SN74AS623 are characterized for operation from
0
°C to 70°C.
FUNCTION TABLE
INPUTS
OPERATION
OEBA
OEAB
SN74ALS620A
SN74ALS621A
SN74ALS623A
SN74AS623
L
B data to A bus
H
HA data to B bus
A data to B bus
H
L
Isolation
L
H
B data to A bus,
A data to B bus
B data to A bus,
A data to B bus
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
OEAB
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
OEBA
B1
B2
B3
B4
B5
B6
B7
B8
DW OR N PACKAGE
(TOP VIEW)
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
相关PDF资料 |
PDF描述 |
|---|---|
| SN74ALS621ADWRG4 | ALS SERIES, 1-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| SN74ALS621ADWRE4 | ALS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| SN74ALS623ANSR | ALS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| SN74ALS621A-1DWR | ALS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| SN74ALS623ADW | ALS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SN74ALS621A-1NSRG4 | 功能描述:总线收发器 OCTAL BUS TRANSCEIVER RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| SN74ALS621ADW | 功能描述:总线收发器 OCTAL BUS TRANSCEIVER RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| SN74ALS621ADWE4 | 功能描述:总线收发器 OCTAL BUS TRANSCEIVER RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| SN74ALS621ADWG4 | 功能描述:总线收发器 OCTAL BUS TRANSCEIVER RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| SN74ALS621ADWR | 功能描述:总线收发器 OCTAL BUS TRANSCEIVER RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
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