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54688 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 54688
기능 8-Bit Magnitude Comparator
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54688 데이터시트, 핀배열, 회로
February 1988
MM54HCT688 MM74HCT688
8-Bit Magnitude Comparator (Equality Detector)
General Description
This equality detector utilizes advanced silicon-gate CMOS
technology to compare bit for bit two 8-bit words and indi-
cate whether or not they are equal The PeQ output indi-
cates equality when it is low A single active low enable is
provided to facilitate cascading of several packages and en-
able comparison of words greater than 8 bits
This device is useful in memory block decoding applica-
tions where memory block enable signals must be generat-
ed from computer address information
The comparator combines the low power consumption of
CMOS but inputs are compatible with TTL logic levels and
the output can drive 10 low power Schottky equivalent
loads
MM54HCT MM74HCT devices are intended to interface be-
tween TTL and NMOS components and standard CMOS
devices These parts are also plug in replacements for LS-
TTL devices and can be used to reduce power consumption
in existing designs
All inputs are protected from damage due to static dis-
charge by diodes to VCC and ground
Features
Y TTL input compatible
Y Typical propagation delay 20 ns
Y Low quiescent current 80 mA maximum (74HCT Series)
Y Large output current 4 mA
Y Same as HCT521
Logic Diagrams
C1995 National Semiconductor Corporation TL F 5371
TL F 5371 – 2
RRD-B30M105 Printed in U S A




54688 pdf, 반도체, 판매, 대치품
Physical Dimensions inches (millimeters)
Order Number MM54HCT688J or MM74HCT688J
NS Package J20A
LIFE SUPPORT POLICY
Order Number MM74HCT688N
NS Package N20A
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
systems which (a) are intended for surgical implant
into the body or (b) support or sustain life and whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling can
be reasonably expected to result in a significant injury
to the user
2 A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system or to affect its safety or
effectiveness
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National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications

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54688

8-Bit Magnitude Comparator

National Semiconductor
National Semiconductor

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