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CD74HC137_02

更新时间: 2024-11-01 05:18:11
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德州仪器 - TI 解复用器锁存器
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9页 66K
描述
High Speed CMOS Logic, 3-to-8 Line Decoder Demultiplexer with Address Latches

CD74HC137_02 数据手册

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CD74HC137, CD74HCT137,  
CD54/74HC237, CD74HCT237  
Data sheet acquired from Harris Semiconductor  
SCHS146C  
High Speed CMOS Logic, 3-to-8 Line Decoder  
Demultiplexer with Address Latches  
March 1998 - Revised July 2002  
Features  
Description  
• Select One of Eight Data Outputs  
The  
CD74HC137,  
CD74HCT137,  
’HC237,  
and  
CD74HCT237 are high speed silicon gate CMOS decoders  
well suited to memory address decoding or data routing  
applications. Both circuits feature low power consumption  
usually associated with CMOS circuitry, yet have speeds  
comparable to low power Schottky TTL logic.  
- Active Low for CD74HC137 and CD74HCT137  
- Active High for ’HC237 and CD74HCT237  
[ /Title  
(CD74  
HC137  
,
• l/O Port or Memory Selector  
• Two Enable Inputs to Simplify Cascading  
Both circuits have three binary select inputs (A0, A1 and A2)  
that can be latched by an active High Latch Enable (LE) sig-  
nal to isolate the outputs from select-input changes. A “Low”  
LE makes the output transparent to the input and the circuit  
functions as a one-of-eight decoder. Two Output Enable  
CD74  
HCT13  
7,  
CD74  
HC237  
,
CD74  
HCT23  
7)  
/Sub-  
ject  
• Typical Propagation Delay of 13ns at V  
o
= 5V,  
CC  
15pF, T = 25 C (CD74HC237)  
A
• Fanout (Over Temperature Range)  
- Standard Outputs. . . . . . . . . . . . . . . 10 LSTTL Loads  
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads  
inputs (OE and OE ) are provided to simplify cascading  
1
0
and to facilitate demultiplexing. The demultiplexing function  
o
o
• Wide Operating Temperature Range . . . -55 C to 125 C  
• Balanced Propagation Delay and Transition Times  
is accomplished by using the A , A , A inputs to select the  
0
1
2
desired output and using one of the other Output Enable  
inputs as the data input while holding the other Output  
Enable input in its active state. In the CD74HC137 and  
CD74HCT137 the selected output is a “Low”; in the ’HC237  
and CD74HCT237 the selected output is a “High”.  
• Significant Power Reduction Compared to LSTTL  
Logic ICs  
• HC Types  
- 2V to 6V Operation  
Ordering Information  
(High  
Speed  
- High Noise Immunity: N = 30%, N = 30%, of V  
IL IH  
CC  
at V  
= 5V  
TEMP. RANGE  
o
CC  
PART NUMBER  
CD74HC137E  
( C)  
PACKAGE  
16 Ld PDIP  
16 Ld PDIP  
16 Ld SOIC  
16 Ld CERDIP  
16 Ld CERDIP  
16 Ld PDIP  
16 Ld SOIC  
16 Ld SOIC  
16 Ld SOP  
• HCT Types  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
-55 to 125  
- 4.5V to 5.5V Operation  
- Direct LSTTL Input Logic Compatibility,  
CD74HCT137E  
CD74HCT137M96  
CD54HC237F  
V = 0.8V (Max), V = 2V (Min)  
IL IH  
- CMOS Input Compatibility, I 1µA at V , V  
l
OL OH  
CD54HC237F3A  
CD74HC237E  
Pinout  
CD54HC237  
(CERDIP)  
CD74HC137, CD74HCT137, CD74HCT237  
(PDIP, SOIC)  
CD74HC237M  
CD74HC237M96  
CD74HC237NSR  
CD74HC237PWR  
CD74HCT237E  
NOTES:  
CD74HC237  
(PDIP, SOIC, SOP, TSSOP)  
TOP VIEW  
16 Ld TSSOP  
16 Ld PDIP  
A
A
A
1
2
3
4
5
6
7
8
16 V  
15 Y  
14 Y  
13 Y  
12 Y  
11 Y  
10 Y  
0
1
3
CC  
0
1
1. When ordering, use the entire part number. Add the suffix 96 to  
obtain the variant in the tape and reel.  
LE  
2
OE  
1
0
7
3
2. Wafer and die for this part number is available which meets all  
electrical specifications. Please contact your local TI sales office  
or customer service for ordering information.  
OE  
Y
4
5
9
Y
GND  
6
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.  
Copyright © 2002, Texas Instruments Incorporated  
1

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