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HD74LS85
4-bit Magnitude Comparator
REJ03D0421-0200 Rev.2.00 Feb.18.2005 This four bit magnitude comparator performs comparison of straight binary and straight BCD (8-4-2-1) codes. Three fully decoded decisions about two 4-bit words (A, B) are made and are externally available at three outputs. This device is fully expandable to any number of bits without external gates. Words of greater length may be compared by connecting comparators in cascade. The A > B, A < B, and A = B outputs of a stage handling less-significant bits. The stage handling the least- significant bits must have a high-level voltage applied to the A B input. The cascading path is implemented with only a two-gate-level delay to reduce overall comparison times for long words.
Features
* Ordering Information
Part Name HD74LS85P HD74LS85FPEL Package Type DILP-16 pin SOP-16 pin (JEITA) Package Code (Previous Code) PRDP0016AE-B (DP-16FV) PRSP0016DH-B (FP-16DAV) Package Abbreviation P FP Taping Abbreviation (Quantity) -- EL (2,000 pcs/reel)
Note: Please consult the sales office for the above package availability.
Pin Arrangement
B3 Data Input AB A>B Outputs A=B A1 B3 2 3 4 5 6 7 8 AB A>B A3 B2 A2 A1
16 15 14 13 12 11 10 9
VCC A3 B2 A2 A1 B1 A0 B0 Data Inputs
A=B Out B1 A(Top view)
Rev.2.00, Feb.18.2005, page 1 of 6
HD74LS85
Function Table
A3, B3 A3 > B3 A3 < B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 A3 = B3 Inputs A2, B2 A1, B1 X X X X A2 > B2 X A2 < B2 X A2 = B2 A1 > B1 A2 = B2 A1 < B1 A2 = B2 A1 = B1 A2 = B2 A1 = B1 A2 = B2 A1 = B1 A2 = B2 A1 = B1 A2 = B2 A1 = B1 A2 = B2 A1 = B1 A2 = B2 A1 = B1 A0, B0 X X X X X X A0 > B0 A0 < B0 A0 = B0 A0 = B0 A0 = B0 A0 = B0 A0 = B0 Cascading Inputs A>B AB H L H L H L H L H L L L H Outputs AH; high level, L; low level, X; irrelevant
Block Diagram
A3 B3
A>B A2 B2 AB A1 B1 AA0 B0
Absolute Maximum Ratings
Item Symbol Ratings Supply voltage VCC 7 Input voltage VIN 7 Power dissipation PT 400 Storage temperature Tstg -65 to +150 Note: Voltage value, unless otherwise noted, are with respect to network ground terminal. Unit V V mW C
Rev.2.00, Feb.18.2005, page 2 of 6
HD74LS85
Recommended Operating Conditions
Item Supply voltage Output current Operating temperature Symbol VCC IOH IOL Topr Min 4.75 -- -- -20 Typ 5.00 -- -- 25 Max 5.25 -400 8 75 Unit V A mA C
Electrical Characteristics
(Ta = -20 to +75 C)
Item Input voltage Symbol VIH VIL VOH Output voltage VOL A < B, A > B inputs Other inputs Input current A < B, A > B inputs Other inputs A < B, A > B inputs Other inputs Short-circuit output current Supply current** Input clamp voltage min. 2.0 -- 2.7 -- -- -- -- IIL -- -- II -- -- IOS ICC VIK -20 -- -- typ.* -- -- -- -- -- -- -- -- -- -- -- -- 10.4 -- max. -- 0.8 -- 0.4 0.5 20 60 -0.4 -1.2 0.1 0.3 -100 20 -1.5 mA mA V VCC = 5.25 V VCC = 5.25 V VCC = 4.75 V, IIN = -18 mA mA VCC = 5.25 V, VI = 7 V mA VCC = 5.25 V, VI = 0.4 V Unit V V V V A Condition
VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V, IOH = -400 A IOL = 4 mA VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V IOL = 8 mA VCC = 5.25 V, VI = 2.7 V
IIH
Note: * VCC = 5 V, Ta = 25C ** ICC is measured with outputs open, A = B grounded, and all other inputs at 4.5 V.
Switching Characteristics
(VCC = 5 V, Ta = 25C)
Item Symbol Inputs Outputs Number of gate levels 1 2 3 4 1 2 3 4 1 1 2 2 1 1 min. -- -- -- -- -- -- -- -- -- -- -- -- -- -- typ. 14 19 24 27 11 15 20 23 14 11 13 13 14 11 max. -- -- 36 45 -- -- 30 45 22 17 20 26 22 17 ns CL = 15 pF, RL = 2 k Unit Condition
tPLH
Any A or B data input
A < B, A > B A=B
Propagation delay time
tPHL
Any A or B data input A < B or A=B A=B A > B or A=B
A < B, A > B A=B
tPHL tPHL tPLH tPHL tPLH tPHL
A>B A=B ARev.2.00, Feb.18.2005, page 3 of 6
HD74LS85
Testing Method
Test Circuit
VCC Output
4.5V
Input P.G. Zout = 50
See Testing Table
A3 B3 A2 B2 A1 B1 A0 B0 AB
RL A>B CL Output A=B Output ALoad circuit 1
Same as Load Circuit 1. Same as Load Circuit 1.
Notes:
1. CL includes probe and jig capacitance. 2. All diodes are 1S2074(H).
Waveform
tTLH 90% 1.3 V 10% tPLH tTHL 90% 1.3 V 10% tPHL VOH In phase output (A) tPHL 1.3 V tPLH VOH Out of phase output (B) 1.3 V 1.3 V VOL 1.3 V VOL 3V 0V
Input
Note:
Input pulse; tTLH 15 ns, tTHL 6 ns, PRR = 1 MHz, duty cycle = 50%
Rev.2.00, Feb.18.2005, page 4 of 6
HD74LS85 Testing Table
Item A3 IN 4.5 v GND GND GND GND GND GND GND GND GND GND GND B3 4.5 v IN GND GND GND GND GND GND GND GND GND GND GND A2 4.5 v GND IN 4.5 v GND GND GND GND GND GND GND GND GND B2 GND 4.5 v 4.5 v IN GND GND GND GND GND GND GND GND GND Inputs A1 B1 GND GND GND GND 4.5 v GND GND 4.5 v IN 4.5 v 4.5 v IN GND GND GND GND GND GND GND GND GND GND GND GND GND GND A0 GND GND GND GND 4.5 v GND IN 4.5 v IN 4.5 v GND GND GND B0 GND GND GND GND GND 4.5 v 4.5 v IN 4.5 v IN GND GND GND A>B GND GND GND GND GND GND 4.5 v GND GND GND IN GND GND A=B GND GND GND GND GND GND GND GND 4.5 v 4.5 v GND IN GND Output waveforms AB A=B AtPLH tPHL
Rev.2.00, Feb.18.2005, page 5 of 6
HD74LS85
Package Dimensions
JEITA Package Code P-DIP16-6.3x19.2-2.54 RENESAS Code PRDP0016AE-B Previous Code DP-16FV MASS[Typ.] 1.05g
D
16
9
1 0.89 b3
8
Z
E
A1
A
Reference Symbol
Dimension in Millimeters Min Nom 7.62 19.2 6.3 20.32 7.4 5.06 0.51 0.40 0.48 1.30 0.19 0 2.29 2.54 0.25 0.31 15 2.79 1.12 2.54 0.56 Max
e D E
L
1
A A1
e
bp
e1
b c b c
p 3
e Z ( Ni/Pd/Au plating ) L
JEITA Package Code P-SOP16-5.5x10.06-1.27
RENESAS Code PRSP0016DH-B
Previous Code FP-16DAV
MASS[Typ.] 0.24g
*1
D F 9
16
NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET.
bp
HE
E
Index mark
Reference Symbol
*2
c
Dimension in Millimeters Min Nom 10.06 5.50 Max 10.5
Terminal cross section ( Ni/Pd/Au plating )
1 Z e
*3
D E A2
8 bp x M L1
A1 A bp b1 c
0.00
0.10
0.20 2.20
0.34
0.40
0.46
0.15
1
0.20
0.25
A
c
HE
0 7.50 7.80 1.27
8 8.00
A1
y L
e x y
0.12 0.15 0.80 0.50
1
Detail F
Z L L 0.70 1.15
0.90
Rev.2.00, Feb.18.2005, page 6 of 6
Sales Strategic Planning Div.
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