INTEGRATED CIRCUITS
74F85 4-bit magnitude comparator
Product specification IC15 Data Handbook 1994 Sep 27
Philips Semiconductors
Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
FEATURES
* High-impedance NPN base inputs for reduced loading
(20A in High and Low states)
PIN CONFIGURATION
B3 IAB 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC A3 B2 A2 A1 B1 A0 B0
* Magnitude comparison of any binary words * Serial or parallel expansion without extra gating
DESCRIPTION
The 74F85 is a 4-bit magnitude comparator that can be expanded to almost any length. It compares two 4-bit binary, BCD, or other monotonic codes and presents the three possible magnitude results at the outputs. The 4-bit inputs are weighted (A0-A3) and (B0-B3) where A3 and B3 are the most significant bits. The operation of the 74F85 is described in the Function Table, showing all possible logic conditions. The upper part of the table describes the normal operation under all conditions that will occur in a single device or in a series expansion scheme. In the upper part of the table the three outputs are mutually exclusive. In the lower part of the table, the outputs reflect the feed-forward conditions that exist in the parallel expansion scheme. The expansion inputs IA>B, and IA=B and IAB, A=B and AB, IA=B and IAB = Low, IA=B = High, and IAA>B A=B ASF00075
TYPE
TYPICAL PROPAGATION DELAY 7.0ns
TYPICAL SUPPLY CURRENT (TOTAL) 40mA
74F85
ORDERING INFORMATION
DESCRIPTION 16-pin plastic DIP 16-pin plastic SO COMMERCIAL RANGE VCC = 5V 10%, Tamb = 0C to +70C N74F85N N74F85D PKG DWG # SOT38-4 SOT162-1
INPUT AND OUTPUT LOADING AND FAN OUT TABLE
PINS A0-A3 B0-B3 IAB AB DESCRIPTION Comparing inputs Comparing inputs Expansion inputs (active High) Data outputs (active High) 74F (U.L.) HIGH/LOW 1.0/0.033 1.0/0.033 1.0/0.033 50/33 LOAD VALUE HIGH/LOW 20A/20A 20A/20A 20A/20A 1.0mA/20mA
NOTE: One (1.0) FAST unit load is defined as: 20A in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
10 12 13 15 9 11 14 1
IEC/IEEE SYMBOL
10 12 13 P 3 0 Q 3 < = > PQ 7 6 5 0 COMP
A0 2 3 4 IAB
A1
A2
A3
B0
B1
B2
B3
15 9 11 14 1
A>B
A=B
A2 3
VCC = Pin 16 GND = Pin 8
4 5 6 7
SF00076
SF00077
September 27, 1994
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853-0055 13903
Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
LOGIC DIAGRAM
A3 B3
15 1
5 A>B
A2 B2 IAB
13 14 2 3 4 12 11 6 A=B
A1 B1
7 AA0 B0
10 9
VCC = Pin 16 GND = Pin 8
SF00078
FUNCTION TABLE
COMPARING INPUTS A3,B3 A3>B3 A3B2 A2B1 A1B0 A0B X X X X X X X X H L L X H L EXPANSION INPUTS IAB H L H L H L H L H L L L L H OUTPUTS AA3=B3 A2=B2 H = High voltage level L = Low voltage level X = Don't care September 27, 1994
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Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
APPLICATION
INPUTS (LSB) B23 A23 B22 A22 B21 A21 B20 A20 B19 L A19 B18 A18 B17 A17 B16 A16 B15 A15 B14 L A14 B13 A13 B12 A12 B11 A11 B10 A10 B9 L A9 B8 A8 B7 A7 B6 A6 B5 A5 B4 L A4 B3 A3 B2 A2 B1 A1 (LSB) B0 A0 L H L B3 A3 B2 A2 B1 A1 B0 A0 IAB B3 A3 B2 A2 B1 A1 B0 A0 IAB B3 A3 B2 A2 B1 A1 B0 A0 IAB B3 A3 B2 A2 B1 A1 B0 A0 IAB B3 A3 B2 A2 B1 A1 B0 A0 IAB AB AB NC AB NC B3 A3 B2 A2 B1 A1 B0 A0 AB AB OUTPUTS AB NC AB NC
The parallel expansion scheme shown in Figure 1 demonstrates the most efficient general use of these comparators. The expansion inputs can be used as a fifth input bit position except on the least significant device, which must be connected as in the serial scheme. The expansion inputs used by labeling IA>B as an "A" input, IATable 1.
WORD LENGTH 1-4 bits 5-24 bits 25-120 bits NUMBER OF PACKAGES 1 2-6 8-31 TYPICAL SPEEDS 74F 12ns 22ns 34ns
SF00079
Figure 1. Comparison of Two 24-Bit Words
September 27, 1994
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Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free-air temperature range.) SYMBOL VCC VIN IIN VOUT IOUT Tamb Tstg Supply voltage Input voltage Input current Voltage applied to output in High output state Current applied to output in Low output state Operating free-air temperature range Storage temperature range PARAMETER RATING -0.5 to +7.0 -0.5 to +7.0 -30 to +5 -0.5 to VCC 40 0 to +70 -65 to +150 UNIT V V mA V mA C C
RECOMMENDED OPERATING CONDITIONS
LIMITS SYMBOL VCC VIH VIL IIK IOH IOL Tamb Supply voltage High-level input voltage Low-level input voltage Input clamp current High-level output current Low-level output current Operating free-air temperature range 0 PARAMETER MIN 4.5 2.0 0.8 -18 -1 20 +70 NOM 5.0 MAX 5.5 V V V mA mA mA C UNIT
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS1 VCC = MIN, VIL = MAX VIH = MIN, IOH = MAX Low-level Low level output voltage Input clamp voltage Input current at maximum input voltage High-level input current Low-level input current Short-circuit output current3 ICCH ICC Supply current (total) ICCL VCC = MAX VCC = MIN, VIL = MAX VIH = MIN, IOL = MAX VCC = MIN, II = IIK VCC = 0.0V, VI = 7.0V VCC = MAX, VI = 2.7V VCC = MAX, VI = 0.5V VCC = MAX VIN = GND An = Bn = IA=B = GND, IA>B= IAVO OH
High level output voltage High-level
V
VO OL VIK II IIH IIL IOS
NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type. 2. All typical values are at VCC = 5V, Tamb = 25C. 3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last.
September 27, 1994
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Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
AC ELECTRICAL CHARACTERISTICS
LIMITS SYMBOL PARAMETER TEST CONDITION VCC = +5.0V Tamb = +25C CL = 50pF, RL = 500 MIN tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL Propagation delay A or B to AB Propagation delay A or B to A=B Propagation delay IAB Propagation delay IA=B to A=B Propagation delay IA>B and IA=B to AAC WAVEFORMS
VIN
VM tPHL
VM tPLH
VOUT
VM
VM
SF00080
Waveform 1. Propagation Delay Input to Output NOTE: For all waveforms, VM = 1.5V.
TEST CIRCUIT AND WAVEFORMS
VCC NEGATIVE PULSE VIN PULSE GENERATOR RT D.U.T. VOUT 90% VM 10% tTHL (tf ) CL RL tw VM 10% tTLH (tr ) 0V 90% AMP (V)
tTLH (tr ) 90% POSITIVE PULSE VM 10% tw
tTHL (tf ) AMP (V) 90% VM 10% 0V
Test Circuit for Totem-Pole Outputs DEFINITIONS: RL = Load resistor; see AC ELECTRICAL CHARACTERISTICS for value. CL = Load capacitance includes jig and probe capacitance; see AC ELECTRICAL CHARACTERISTICS for value. RT = Termination resistance should be equal to ZOUT of pulse generators.
Input Pulse Definition INPUT PULSE REQUIREMENTS family amplitude VM 74F 3.0V 1.5V rep. rate 1MHz tw 500ns tTLH 2.5ns tTHL 2.5ns
SF00006
September 27, 1994
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Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
DIP16: plastic dual in-line package; 16 leads (300 mil)
SOT38-4
1994 Sep 27
7
Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
SO16: plastic small outline package; 16 leads; body width 7.5 mm
SOT162-1
1994 Sep 27
8
Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
NOTES
1994 Sep 27
9
Philips Semiconductors
Product specification
4-bit magnitude comparator
74F85
Data sheet status
Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make chages at any time without notice in order to improve design and supply the best possible product. This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.
Production
[1] Please consult the most recently issued datasheet before initiating or completing a design.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 1998 All rights reserved. Printed in U.S.A. print code Document order number: Date of release: 10-98 9397-750-05067
Philips Semiconductors
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