Equality Detector. MM74HC688 Datasheet


MM74HC688 Detector. Datasheet pdf. Equivalent


Part Number

MM74HC688

Description

8-Bit Magnitude Comparator (Equality Detector)

Manufacture

Fairchild

Total Page 6 Pages
Datasheet
Download MM74HC688 Datasheet


MM74HC688
September 1983
Revised February 1999
MM74HC688
8-Bit Magnitude Comparator (Equality Detector)
General Description
The MM74HC688 equality detector utilizes advanced sili-
con-gate CMOS technology to compare bit for bit two 8-bit
words and indicates whether or not they are equal. The
P=Q output indicates equality when it is LOW. A single
active low enable is provided to facilitate cascading of sev-
eral packages and enable comparison of words greater
than 8 bits.
This device is useful in memory block decoding applica-
tions, where memory block enable signals must be gener-
ated from computer address information.
The comparator’s output can drive 10 low power Schottky
equivalent loads. This comparator is functionally and pin
compatible to the 74LS688. All inputs are protected from
damage due to static discharge by diodes to VCC and
ground.
Features
s Typical propagation delay: 20 ns
s Wide power supply range: 2–6V
s Low quiescent current: 80 µA (74 Series)
s Large output current: 4 mA (74 Series)
s Same as HC521
Ordering Code:
Order Number Package Number
Package Description
MM74HC688WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300” Wide
MM74HC688SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MM74HC688MTC
MTC20
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
MM74HC688N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300” Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Logic Diagram
Pin Assignments for DIP
Truth Table
Top View
Inputs
Data
Enable
P,Q G
P=Q
L
P>Q
L
P<Q
L
XH
P=Q
L
H
H
H
© 1999 Fairchild Semiconductor Corporation DS005018.prf
www.fairchildsemi.com

MM74HC688
Absolute Maximum Ratings(Note 1)
(Note 2)
Recommended Operating
Conditions
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
Lead Temperature (TL)
(Soldering 10 seconds)
0.5 to +7.0V
Min Max Units
1.5 to VCC +1.5V Supply Voltage (VCC)
0.5 to VCC +0.5V DC Input or Output Voltage
±20 mA (VIN, VOUT)
±25 mA Operating Temperature Range (TA)
±50 mA Input Rise or Fall Times
2
0
40
6
VCC
+85
V
V
°C
65°C to +150°C (tr, tf) VCC = 2.0V
1000 ns
600 mW
500 mW
VCC = 4.5V
500 ns
VCC = 6.0V
400 ns
Note 1: Absolute Maximum Ratings are those values beyond which dam-
age to the device may occur.
260°C
Note 2: Unless otherwise specified all voltages are referenced to ground.
Note 3: Power Dissipation temperature derating — plastic “N” package:
12 mW/°C from 65°C to 85°C.
DC Electrical Characteristics (Note 4)
Symbol
Parameter
Conditions
VCC
TA = 25°C
TA = −40 to 85°C TA = −55 to 125°C Units
Typ Guaranteed Limits
VIH Minimum HIGH Level
Input Voltage
2.0V
4.5V
1.5
3.15
1.5
3.15
1.5
3.15
V
V
6.0V
4.2 4.2
4.2 V
VIL Maximum LOW Level
Input Voltage
2.0V
4.5V
0.5
1.35
0.5
1.35
0.5
1.35
V
V
6.0V
1.8 1.8
1.8 V
VOH Minimum HIGH Level VIN = VIH or VIL
Output Voltage
|IOUT| 20 µA
2.0V
4.5V
2.0
4.5
1.9
4.4
1.9
4.4
1.9 V
4.4 V
6.0V
6.0
5.9
5.9
5.9 V
VIN = VIH or VIL
|IOUT| 4.0 mA
|IOUT| 5.2 mA
VOL Maximum LOW Level VIN = VIH or VIL
Output Voltage
|IOUT| 20 µA
4.5V 4.2 3.98
6.0V 5.7 5.48
2.0V
4.5V
0
0
0.1
0.1
3.84
5.34
0.1
0.1
3.7 V
5.2 V
0.1 V
0.1 V
6.0V
0
0.1
0.1
0.1 V
IIN Maximum Input
Current
VIN = VIH or VIL
|IOUT| 4.0 mA
|IOUT| 5.2 mA
VIN = VCC or GND
4.5V 0.2 0.26
6.0V 0.2 0.26
6.0V
±0.1
0.33
0.33
±1.0
0.4
0.4
±1.0
V
V
µA
ICC Maximum Quiescent VIN = VCC or GND
6.0V
8.0 80
160 µA
Supply Current
IOUT = 0 µA
Note 4: For a power supply of 5V ±10% the worst case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when
designing with this supply. Worst case VIH and VIL occur at VCC = 5.5V and 4.5V respectively. (The VIH value at 5.5V is 3.85V.) The worst case leakage cur-
rent (IIN, ICC, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used.
www.fairchildsemi.com
2


Features MM74HC688 8-Bit Magnitude Comparator (Eq uality Detector) September 1983 Revise d February 1999 MM74HC688 8-Bit Magnit ude Comparator (Equality Detector) Gene ral Description The MM74HC688 equality detector utilizes advanced silicon-gate CMOS technology to compare bit for bit two 8-bit words and indicates whether or not they are equal. The P=Q output i ndicates equality when it is LOW. A sin gle active low enable is provided to fa cilitate cascading of several packages and enable comparison of words greater than 8 bits. This device is useful in m emory block decoding applications, wher e memory block enable signals must be g enerated from computer address informat ion. The comparator’s output can driv e 10 low power Schottky equivalent load s. This comparator is functionally and pin compatible to the 74LS688. All inpu ts are protected from damage due to sta tic discharge by diodes to VCC and grou nd. Features s Typical propagation del ay: 20 ns s Wide power supply range: 2–6V s Low quiescent current.
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