74HC257;74HCT257是高速硅栅CMOS器件,与低功耗肖特基TTL (LSTTL)针脚兼容。
74HC257和74HCT257具有四个相同的2输入多路复用器,带3态输出,其从两个数据源选择4位数据且受公共数据选择输入控制。
输入S为低电平时选中的是来自数据源0(1I0至4I0)的数据输入,S为高电平时选中的是数据源1(1I1至4I1)的数据输入。来自所选输入的数据以真正(非反相)形式出现在输出(1Y至4Y)处。
74HC257和74HCT257是4极2位置开关的逻辑实施,其中开关位置由施加到S的逻辑电平确定。OE为高电平时,输出被强制为高阻抗关断状态。
输出的逻辑方程式为:
1Y = OE • (1I1 • S • 1I0 •S)
2Y = OE • (2I1 • S • 2I0 •S)
3Y = OE • (3I1 • S • 3I0 •S)
4Y = OE • (4I1 • S • 4I0 •S)
除其非反相(真正)输出外,74HC257;74HCT257等同于74HC258。
名称/描述 | Modified Date |
---|---|
Quad 2-input multiplexer; 3-state (REV 7.0) PDF (165.0 kB) 74HC_HCT257 [English] | 02 Feb 2016 |
名称/描述 | Modified Date |
---|---|
Live Insertion Aspects of Philips Logic Families (REV 1.0) PDF (73.0 kB) AN252 [English] | 13 Mar 2013 |
Pin FMEA 74HC/74HCT family (REV 1.0) PDF (51.0 kB) AN11044 [English] | 16 Mar 2011 |
名称/描述 | Modified Date |
---|---|
HC/T User Guide (REV 1.0) PDF (508.0 kB) HCT_USER_GUIDE [English] | 01 Nov 1997 |
名称/描述 | Modified Date |
---|---|
ロジック製品セレクションガイド... (REV 1.0) PDF (38.3 MB) LOGIC_SELECTION_GUIDE_2015_JP [English] | 19 Nov 2015 |
Logic selection guide 2016 (REV 1.1) PDF (15.3 MB) 75017285 [English] | 08 Jan 2015 |
名称/描述 | Modified Date |
---|---|
plastic small outline package; 16 leads; body width 3.9 mm (REV 1.0) PDF (192.0 kB) SOT109-1 [English] | 08 Feb 2016 |
plastic shrink small outline package; 16 leads; body width 5.3 mm (REV 1.0) PDF (306.0 kB) SOT338-1 [English] | 08 Feb 2016 |
plastic thin shrink small outline package; 16 leads; body width 4.4 mm (REV 1.0) PDF (300.0 kB) SOT403-1 [English] | 08 Feb 2016 |
名称/描述 | Modified Date |
---|---|
SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 4.0) PDF (210.0 kB) SOT109-1_118 [English] | 24 Apr 2013 |
TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (218.0 kB) SOT403-1_118 [English] | 08 Apr 2013 |
名称/描述 | Modified Date |
---|---|
Footprint for reflow soldering (REV 1.0) PDF (9.0 kB) SO-SOJ-REFLOW [English] | 08 Oct 2009 |
Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE [English] | 08 Oct 2009 |
Footprint for reflow soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-REFLOW [English] | 08 Oct 2009 |
Footprint for wave soldering (REV 1.0) PDF (16.0 kB) SSOP-TSSOP-VSO-WAVE [English] | 08 Oct 2009 |
型号 | 状态 |
---|---|
74HCT257DB | Active |
74HC257DB | Active |
74HC257PW | Active |
74HCT257PW | Active |
74HC257D | Active |
74HCT257D | Active |
产品编号 | 封装说明 | Outline Version | 回流/波峰焊接 | 包装 | 产品状态 | 部件编号订购码 (12NC) | Marking | 化学成分 | RoHS / 无铅 / RHF | 无铅转换日期 | EFR | IFR(FIT) | MTBF(小时) | MSL | MSL LF |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
74HCT257D | SOT109-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE | Reel 13" Q1/T1 CECC | Active | 74HCT257D,653 (9337 136 50653) | 74HCT257D | 74HCT257D | week 35, 2004 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | ||
Bulk Pack, CECC | Active | 74HCT257D,652 (9337 136 50652) | 74HCT257D | 74HCT257D | week 35, 2004 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | |||||
74HCT257D/AU | SOT109-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE | Reel 13" Q1/T1 | Active | 74HCT257D/AUJ (9353 012 66118) | 74HCT257D | 74HCT257D/AU | Always Pb-free | 84.9 | 6.62 | 1.51E8 | 1 | 1 | ||
74HCT257D/S71 | SOT109-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE | Reel 13" Q1/T1 | Withdrawn | 74HCT257D/S71,118 (9350 667 50118) | Standard Marking | week 47, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | |||
74HC257DB | SOT338-1 | SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | 74HC257DB,118 (9351 886 60118) | HC257 | 74HC257DB | week 12, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | ||
Bulk Pack | Active | 74HC257DB,112 (9351 886 60112) | HC257 | 74HC257DB | week 12, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | |||||
74HCT257PW | SOT403-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | 74HCT257PW,118 (9351 884 00118) | HCT257 | 74HCT257PW | week 10, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | ||
Bulk Pack | Active | 74HCT257PW,112 (9351 884 00112) | HCT257 | 74HCT257PW | week 10, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | |||||
74HC257D | SOT109-1 | SO-SOJ-REFLOW
SO-SOJ-WAVE SO-SOJ-REFLOW SO-SOJ-WAVE | Reel 13" Q1/T1 CECC | Active | 74HC257D,653 (9337 136 40653) | 74HC257D | 74HC257D | week 12, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | ||
Bulk Pack, CECC | Active | 74HC257D,652 (9337 136 40652) | 74HC257D | 74HC257D | week 12, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | |||||
74HCT257DB | SOT338-1 | SSOP-TSSOP-VSO-REFLOW
SSOP-TSSOP-VSO-WAVE SSOP-TSSOP-VSO-REFLOW SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | 74HCT257DB,118 (9351 909 60118) | HCT257 | 74HCT257DB | week 12, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | ||
Bulk Pack | Active | 74HCT257DB,112 (9351 909 60112) | HCT257 | 74HCT257DB | week 12, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | |||||
74HC257PW | SOT403-1 | SSOP-TSSOP-VSO-WAVE | Reel 13" Q1/T1 | Active | 74HC257PW,118 (9351 746 80118) | HC257 | 74HC257PW | week 10, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 | ||
Bulk Pack | Active | 74HC257PW,112 (9351 746 80112) | HC257 | 74HC257PW | week 10, 2005 | 84.9 | 6.62 | 1.51E8 | 1 | 1 |