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74HCT257NB PDF预览

74HCT257NB

更新时间: 2024-11-20 13:02:51
品牌 Logo 应用领域
恩智浦 - NXP 复用器
页数 文件大小 规格书
17页 177K
描述
HCT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16

74HCT257NB 技术参数

生命周期:Obsolete包装说明:DIP,
Reach Compliance Code:unknownHTS代码:8542.39.00.01
风险等级:5.09系列:HCT
JESD-30 代码:R-PDIP-T16长度:19.025 mm
负载电容(CL):50 pF逻辑集成电路类型:MULTIPLEXER
功能数量:4输入次数:2
输出次数:1端子数量:16
最高工作温度:125 °C最低工作温度:-40 °C
输出特性:3-STATE输出极性:TRUE
封装主体材料:PLASTIC/EPOXY封装代码:DIP
封装形状:RECTANGULAR封装形式:IN-LINE
传播延迟(tpd):53 ns认证状态:Not Qualified
座面最大高度:4.2 mm最大供电电压 (Vsup):5.5 V
最小供电电压 (Vsup):4.5 V标称供电电压 (Vsup):5 V
表面贴装:NO技术:CMOS
温度等级:AUTOMOTIVE端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
宽度:7.62 mmBase Number Matches:1

74HCT257NB 数据手册

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74HC257; 74HCT257  
Quad 2-input multiplexer; 3-state  
Rev. 05 — 13 January 2010  
Product data sheet  
1. General description  
The 74HC257; 74HCT257 are high-speed Si-gate CMOS devices and are pin compatible  
with Low-power Schottky TTL (LSTTL).  
The 74HC257 and 74HCT257 have four identical 2-input multiplexers with 3-state outputs,  
which select 4 bits of data from two sources and are controlled by a common data select  
input (S).  
The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data  
inputs from source 1 (1I1 to 4I1) are selected when S is HIGH. Data appears at the  
outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.  
The 74HC257 and 74HCT257 are the logic implementation of a 4-pole, 2-position switch,  
where the position of the switch is determined by the logic levels applied to S. The outputs  
are forced to a high-impedance OFF-state when OE is HIGH.  
The logic equations for the outputs are:  
1Y = OE • (1I1 S 1I0 S)  
2Y = OE • (2I1 S 2I0 S)  
3Y = OE • (3I1 S 3I0 S)  
4Y = OE • (4I1 S 4I0 S)  
Except for their non-inverting (true) outputs the 74HC257; 74HCT257 are identical to the  
74HC258.  
2. Features  
„ Non-inverting data path  
„ 3-state outputs interface directly with system bus  
„ Complies with JEDEC standard no. 7A  
„ ESD protection:  
‹ HBM JESD22-A114E exceeds 2000 V  
‹ MM JESD22-A115-A exceeds 200 V  
„ Multiple package options  
„ Specified from 40 °C to +85 °C and from 40 °C to +125 °C  

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