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CY74FCT138TSOIC

更新时间： 2024-09-15 22:28:59
品牌 Logo 应用领域
德州仪器 - TI 解码器
页数 文件大小 规格书
7页 110K
描述
1-of-8 Decoder

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CY74FCT138TSOIC 数据手册

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CY54FCT138T, CY74FCT138T  
1-OF-8 DECODERS  
SCCS013B – MAY 1994 – REVISED OCTOBER 2001  
CY54FCT138T . . . D PACKAGE  
CY74FCT138T . . . Q OR SO PACKAGE  
(TOP VIEW)  
Function, Pinout, and Drive Compatible  
With FCT and F Logic  
Reduced V  
Equivalent FCT Functions  
(Typically = 3.3 V) Versions of  
OH  
A
A
A
E
E
E
O
V
CC  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
0
1
2
1
2
3
7
O
O
O
O
O
O
O
0
1
2
3
4
5
6
Edge-Rate Control Circuitry for  
Significantly Improved Noise  
Characteristics  
I
Supports Partial-Power-Down Mode  
off  
Operation  
Matched Rise and Fall Times  
GND  
Fully Compatible With TTL Input and  
Output Logic Levels  
CY54FCT138T . . . L PACKAGE  
(TOP VIEW)  
Dual 1-of-8 Decoder With Enables  
ESD Protection Exceeds JESD 22  
– 2000-V Human-Body Model (A114-A)  
– 200-V Machine Model (A115-A)  
3
2 1 20 19  
18  
O
O
A
E
4
5
6
7
8
1
2
2
1
– 1000-V Charged-Device Model (C101)  
17  
16  
15  
14  
CY54FCT138T  
– 32-mA Output Sink Current  
– 12-mA Output Source Current  
NC  
NC  
O
3
O
4
E
2
E
3
CY74FCT138T  
9 10 11 12 13  
– 64-mA Output Sink Current  
– 32-mA Output Source Current  
NC – No internal connection  
description  
The ’FCT138T devices are 1-of-8 decoders. These devices accept three binary weighted inputs (A , A , A )  
0
1
2
and, when enabled, provide eight mutually exclusive active-low outputs (O –O ). The ’FCT138T devices  
0
7
feature three enable inputs: two active low (E , E ) and one active high (E ).  
1
2
3
All outputs are high unless E and E are low and E is high. This multiple-enable function allows easy parallel  
1
2
3
expansion of the device to a 1-of-32 (five lines to 32 lines) decoder with just four ’FCT138T devices and one  
inverter.  
These devices are fully specified for partial-power-down applications using I . The I circuitry disables the  
off  
off  
outputs, preventing damaging current backflow through the device when it is powered down.  
PIN DESCRIPTION  
NAME  
DESCRIPTION  
Address inputs  
A
E , E  
Enable inputs (active low)  
Enable input (active high)  
Outputs  
1
2
E
3
O
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Copyright 2001, Texas Instruments Incorporated  
On products compliant to MIL-PRF-38535, all parameters are tested  
unless otherwise noted. On all other products, production  
processing does not necessarily include testing of all parameters.  
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.  
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
1234567

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