Renesas HD74HCT688RPEL 8-bit magnitude comparator Datasheet

HD74HCT688
8-bit Magnitude Comparator
REJ03D0673–0200
(Previous ADE-205-563)
Rev.2.00
Mar 30, 2006
Description
The HD74HCT688 compares 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 several packages and enable comparison of words
greater than 8-bits.
This device is useful in memory block decoding applications, where memory block enable signals must be generated
from computer address information.
Features
•
•
•
•
•
•
•
LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
High Speed Operation: tpd (Data to P=Q) = 18 ns typ (CL = 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 4.5 to 5.5 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
Taping Abbreviation
(Quantity)
HD74HCT688P
DILP-20 pin (JEDEC)
PRDP0020AC-B
(DP-20NEV)
P
—
HD74HCT688FPEL
SOP-20 pin (JEITA)
PRSP0020DD-B
(FP-20DAV)
FP
EL (2,000 pcs/reel)
HD74HCT688RPEL
SOP-20 pin (JEDEC)
PRSP0020DC-A
(FP-20DBV)
RP
EL (1,000 pcs/reel)
Function Table
Input
H :
L :
X :
Data P, Q
P=Q
P>Q
P<Q
X
high level
low level
irrelevant
Rev.2.00, Mar 30, 2006 page 1 of 7
Enable G
L
L
L
H
Output P=Q
L
H
H
H
HD74HCT688
Pin Arrangement
G
1
20 VCC
P0
2
19 P=Q
Q0
3
18 Q7
P1
4
17 P7
Q1
5
16 Q6
P2
6
15 P6
Q2
7
14 Q5
P3
8
13 P5
Q3
9
12 Q4
GND 10
11 P4
(Top view)
Rev.2.00, Mar 30, 2006 page 2 of 7
HD74HCT688
Logic Diagram
P0
Q0
P1
Q1
P2
Q2
P3
Q3
P4
P=Q
Q4
P5
Q5
P6
Q6
P7
Q7
G
Absolute Maximum Ratings
Item
Supply voltage range
Input / Output voltage
Input / Output diode current
Output current
VCC, GND current
Power dissipation
Storage temperature
Symbol
VCC
VIN, VOUT
IIK, IOK
IOUT
ICC or IGND
PT
Tstg
Ratings
–0.5 to 7.0
–0.5 to VCC +0.5
±20
±25
±50
500
–65 to +150
Unit
V
V
mA
mA
mA
mW
°C
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of
which may be realized at the same time.
Rev.2.00, Mar 30, 2006 page 3 of 7
HD74HCT688
Recommended Operating Conditions
Item
Supply voltage
Input / Output voltage
Operating temperature
Input rise / fall time*1
Symbol
VCC
VIN, VOUT
Ta
tr, tf
Ratings
4.5 to 5.5
0 to VCC
–40 to 85
0 to 500
Unit
V
V
°C
ns
Conditions
VCC = 4.5 V
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Electrical Characteristics
Item
Input voltage
Output voltage
Symbol VCC (V)
Min
VIH
4.5 to 5.5 2.0
4.5 to 5.5 —
VIL
VOH
4.5
4.4
4.5
4.18
VOL
4.5
—
4.5
—
Ta = 25°C
Typ
Max
—
—
—
0.8
—
—
—
—
—
0.1
—
0.26
Ta = –40 to+85°C
Min
Max
2.0
—
—
0.8
4.4
—
4.13
—
—
0.1
—
0.33
Unit
Test Conditions
V
V
V
Vin = VIH or VIL IOH = –20 µA
IOH = –4 mA
V
Vin = VIH or VIL IOL = 20 µA
IOL = 4 mA
Input current
Iin
5.5
—
—
±0.1
—
±1.0
µA
Vin = VCC or GND
Quiescent current
ICC
5.5
—
—
4.0
—
40
µA
Vin = VCC or GND, Iout = 0 µA
Switching Characteristics
(CL = 50 pF, Input tr = tf = 6 ns)
Item
Propagation delay
time
Symbol VCC (V)
tPLH
tPHL
tPLH
tPHL
Output rise/fall time
Input capacitance
tTLH
tTHL
Cin
4.5
4.5
4.5
4.5
Ta = 25°C
Ta = –40 to +85°C
Unit
Min
Typ
Max
Min
Max
Test Conditions
—
17
42
—
53
ns Por Q to output
—
19
42
—
53
—
9
24
—
30
ns Enable to output
—
12
24
—
30
4.5
—
5
15
—
19
ns
—
—
5
10
—
10
pF
Test Circuit
Input
Pulse Generator
Zout = 50 Ω
VCC
See Function Table
VCC
G
Output
P1
P7
P=Q
Q0
Q7
Note : 1. CL includes probe and jig capacitance.
Rev.2.00, Mar 30, 2006 page 4 of 7
CL =
50 pF
HD74HCT688
Waveforms
• Waveform – 1
tr
tf
90%
1.3V
10%
P or Q
VCC
90%
1.3V
10%
0V
tw
tPHL
tPLH
90%
1.3V
P=Q
1.3V
10%
G
tr
tf
90%
1.3V
VCC
90%
1.3V
10%
10%
tPHL
0V
tPLH
90%
P=Q
VOL
tTHL
tTLH
• Waveform – 2
VOH
90%
90%
1.3V
10%
tTHL
1.3V
10%
tTLH
Notes : 1. Input waveform : PRR ≤ 1 MHz, duty cycle 50%, tr ≤ 6 ns, tf ≤ 6 ns
Rev.2.00, Mar 30, 2006 page 5 of 7
VOH
VOL
HD74HCT688
Package Dimensions
JEITA Package Code
P-DIP20-6.3x24.5-2.54
RENESAS Code
PRDP0020AC-B
Previous Code
DP-20NEV
MASS[Typ.]
1.26g
D
11
E
20
1
10
b3
0.89
A1
A
Z
Reference
Symbol
L
e1
D
E
A
A1
bp
b3
c
θ
e
Z
L
θ
bp
e
c
e1
( Ni/Pd/Au plating )
JEITA Package Code
P-SOP20-7.5x12.8-1.27
RENESAS Code
PRSP0020DC-A
*1
Previous Code
FP-20DBV
Dimension in Millimeters
Min
Nom Max
7.62
24.50 25.40
6.30 7.00
5.08
0.51
0.40 0.48 0.56
1.30
0.19 0.25 0.31
0°
15°
2.29 2.54 2.79
1.27
2.54
MASS[Typ.]
0.52g
D
F
20
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
@ DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
@ INCLUDE TRIM OFFSET.
11
HE
c
*2
E
bp
Index mark
Terminal cross section
( Ni/Pd/Au plating )
1
e
*3
bp
x
M
L1
A
Z
Reference Dimension in Millimeters
Symbol
10
A1
θ
L
y
Detail F
Rev.2.00, Mar 30, 2006 page 6 of 7
D
E
A2
A1
A
bp
b1
c
c1
θ
HE
e
x
y
Z
L
L1
Min Nom Max
12.80 13.2
7.50
0.10 0.20 0.30
2.65
0.34 0.40 0.46
0.20 0.25 0.30
0°
8°
10.00 10.40 10.65
1.27
0.12
0.15
0.935
0.40 0.70 1.27
1.45
HD74HCT688
JEITA Package Code
P-SOP20-5.5x12.6-1.27
RENESAS Code
PRSP0020DD-B
*1
Previous Code
FP-20DAV
MASS[Typ.]
0.31g
D
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
INCLUDE TRIM OFFSET.
F
20
11
c
HE
*2
E
bp
Index mark
Terminal cross section
( Ni/Pd/Au plating )
1
Z
10
e
*3
bp
x
Reference Dimension in Millimeters
Symbol
M
A
L1
A1
θ
y
L
Detail F
Rev.2.00, Mar 30, 2006 page 7 of 7
D
E
A2
A1
A
bp
b1
c
c1
θ
HE
e
x
y
Z
L
L1
Min Nom Max
12.60 13.0
5.50
0.00 0.10 0.20
2.20
0.34 0.40 0.46
0.15 0.20 0.25
0°
8°
7.50 7.80 8.00
1.27
0.12
0.15
0.80
0.50 0.70 0.90
1.15
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