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询价
产品信息
型号:SN74LS138NSR
数量:2000
厂商:Texas Instruments
描述:XOR (Exclusive OR) IC 4 Channel Open Collector SOIC
系列:74LS
包装:卷带
电压 - 电源:4.75 V ~ 5.25 V
工作温度:0°C ~ 70°C
安装类型:表面贴装
供应商器件封装:SOIC封装/
• Designed Specifically for High Speed:
Memorv Oecoders
Data Transmission Systems
SN54lS13B. SN54S138 . . . J OR W PACKAGE
SN74lS13B. SN74S13SA... 0 OR N PACKAGE
ITOP VIEWI
• 3 Enable Inputs to Simplify Cascadlng and/or Data Reception
• Schottky.Clamped lor High Performance
cription
These Schottky-damped TTL MSJ circuits are designed to be used in high-performance
A B C
G2A G2
1
Y7
GND
Vcc yO
Yl
Y2
Y3
Y4
Y5
Y6
memory decoding or data-routing applications requiring very short propagation delay times. Jn
high-performance memory systems these
docoders can be used to minimize the efNfeE cts 01
sγstem decodìng. When employed withShigh-
spccd memories utilizing a fast enable cirouitheEm
delay times of these decoders and the enable
SN54lS138. SN54S 38. .. FK PACκAGE (TOP VIEWJ
U
u Uo
<Z>>-
time of the memory are usually less than the typical access time of the rr emary. This means
that the effective system delay introduced by the Schottky-damped system decoder is negligible
UMMh
sE
hvm
The 'LS138 SN54S13 and SN74S13A decode one of eight lines dependent on the
conditions at the three binary select inputs and the three enable ìnputs. Twa active-low and ane
E--G
2N2G
CACB1
r- au
>22>->
active-high enable inputs reduce the need for external gat85 or inverters when expanding. A
24-0ne decoder can be implemented without
external inverters and a 32-line decoder requires only one inverter. Än enable input can be
used
as a data input for demultiplexing applications
AII of these decoder/demultiplexers feature fully buffered inputseach of which represents only one
normalized load to its driving circuit. AII Înputs are clamped wÎth high-performance
Schottky diodes to suppres5 line-ringing and t simplify system desn
The SN54LS138 and SN54S138 are characterized for operation over the fullrlritary
temperature range of - 55 oC to 125 0C. The
SN74LS 1 38 and SN74S 1 38A are characterized for operation from QOC to 7Q o C
NC -No jnternal conn ction logic svmbols t
YYNYY
12C34