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MC74HC237

Features: • Output Drive Capability: 10 LSTTL Loads• Outputs Directly Interface to CMOS, NMOS, and TTL• Operating Voltage Range: 2 to 6 V• Low Input Current: 1 mA• High Noise Immunity Characteristic of CMOS Devices• In Compliance with the Requirements Defined by...

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MC74HC237: Features: • Output Drive Capability: 10 LSTTL Loads• Outputs Directly Interface to CMOS, NMOS, and TTL• Operating Voltage Range: 2 to 6 V• Low Input Current: 1 mA• High...

MC74HC237 Data Sheet

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Part Number:
MC74HC237
Supply Ability:
5000

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Product Details

Description



Features:

• Output Drive Capability: 10 LSTTL Loads
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2 to 6 V
• Low Input Current: 1 mA
• High Noise Immunity Characteristic of CMOS Devices
• In Compliance with the Requirements Defined by JEDEC Standard No 7A
• Chip Complexity: 156 FETs or 39 Equivalent Gate


Pinout

Connection Diagram


Specifications

Symbol Parameter Value Unit
vcc DC Supply Voltage (Referenced to GND) 0.5 to +7.0 V
VIN DC Input Voltage (Referenced to GND) 0.5 to VCC + 0.5 V
VOUT DC Output Voltage (Referenced to GND) 0.5 to VCC + 0.5 V
LIN DC Input Current, per Pin ±20 mA
IOUT DC Onput Current, per Pin ±25 mA
ICC DC Supply Current Per Supply Pin ±50 mA
PD Power dissipation in still air piastic DIP
SOIC package
750
500		 mW
TSTG Storage Temperature 65 to +150 °C
TL Lead Temperature, 1 mm from Case for 10 Seconds
(Plastic DIP or SOIC Package)		 260 °C
* Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
?Derating - Plastic DIP: 10 mW/ from 65to 125
Ceramic DIP: 10 mW/ from 100 to 125
SOIC Package: 7 mW/ from 65 to 125
For high frequency or heavy load considerations, see Chapter 2 of the Motorola HighSpeed CMOS Data Book (DL129/D).


Description

The MC74HC237 is identical in pinout to the LS137, but has noninverting outputs. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs.

The HC237 decodes a threebit Address to oneofeight activehigh outputs. MC74HC237 has a transparent latch for storage of the Address. Two Chip Selects, one activelow and one activehigh, are provided to facilitate the demultiplexing, cascading, and chipselecting functions.

The demultiplexing function of MC74HC237 is accomplished by using the Address inputs to select the desired device output, and then by using one of the Chip Selects as a data input while holding the other one active. The HC237 is the noninverting version of the HC137




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