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National Semiconductor Electronic Components Datasheet


74688

8-Bit Magnitude Comparator



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74688 pdf
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



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74688 pdf
Absolute Maximum Ratings (Notes 1 2)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage (VCC)
DC Input Voltage (VIN)
DC Output Voltage (VOUT)
Clamp Diode Current (IIK IOK)
DC Output Current per pin (IOUT)
DC VCC or GND Current per pin (ICC)
Storage Temperature Range (TSTG)
Power Dissipation (PD)
(Note 3)
S O Package only
b0 5 to a7 0V
b1 5 to VCCa1 5V
b0 5 to VCCa0 5V
g20 mA
g25 mA
g50 mA
b65 C to a150 C
600 mW
500 mW
Lead Temperature (TL)
(Soldering 10 seconds)
260 C
Operating Conditions
Supply Voltage (VCC)
DC Input or Output Voltage
(VIN VOUT)
Operating Temp Range (TA)
MM74HCT688
MM54HCT688
Min
45
0
b40
b55
Input Rise or Fall Times
(tr tf)
Max
55
VCC
a85
a125
500
Units
V
V
C
C
ns
DC Electrical Characteristics (VCCe5V g10% unless otherwise specified)
Symbol
Parameter
Conditions
TAe25 C
Typ
74HCT
54HCT
TAeb40 to 85 C TAeb55 to 125 C
Guaranteed Limits
Units
VIH Minimum High Level
Input Voltage
20 20
20 V
VIL Maximum Low Level
Input Voltage
08 08
08 V
VOH
Minimum High Level VINe0 8V or 2 0V
Output Voltage
lIOUTle20 mA
VCC VCCb0 1
l lIOUT e4 0 mA VCCe4 5V 4 2
3 98
l lIOUT e4 8 mA VCCe5 5V 5 7
4 98
VOL Maximum Low Level VINeV0 8V or 2 0V
Voltage
lIOUTle20 mA
0 01
l lIOUT e4 0 mA VCCe4 5V 0 2
0 26
l lIOUT e4 8 mA VCCe5 5V 0 2
0 26
IIN
Maximum Input
VINeVCC or GND
Current
g0 1
VCCb0 1
3 84
4 84
01
0 33
0 33
g1 0
VCCb0 1
37
47
01
04
04
g1 0
V
V
V
V
V
V
mA
ICC Maximum Quiescent VINeVCC or GND
Supply Current
IOUTe0 mA
8 0 80
160 mA
VINe2 4V or 0 5V (Note 4) 0 3 0 4
0 5 mA
Note 1 Absolute Maximum Ratings are those values beyond which damage to the device may occur
Note 2 Unless otherwise specified all voltages are referenced to ground
Note 3 Power Dissipation temperature derating plastic ‘‘N’’ package b12 mW C from 65 C to 85 C ceramic ‘‘J’’ package b12 mW C from 100 C to 125 C
Note 4 Measured per pin All other inputs held at VCC or ground
2



Part Number 74688
Description 8-Bit Magnitude Comparator
Maker National Semiconductor - National Semiconductor
Total Page 4 Pages
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