74F148 PHILIPS | Alldatasheet

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/C0109 /C0110 /C0114 74F148 8-input priority encoder Product specification IC15 Data Handbook

1990 Mar 01

Philips Semiconductors Product specification 74F1488-input priority encoder 2March 1, 1990 853–0345 98994

FEATURES

  • Code conversions
  • Multi-channel D/A converter
  • Decimal-to-BCD converter
  • Cascading for priority encoding of “N” bits
  • Input enable capability
  • Priority encoding-automatic selection of highest priority input line
  • Output enable-active Low when all inputs are High
  • Group signal output-active when any input is Low

DESCRIPTION

The 74F148 8-input priority encoder accepts data from eight active-Low inputs and provides a binary representation on the three active-Low outputs. A priority is assigned to each input so that when two or more inputs are simultaneously active, the input with the highest priority is represented on the output, with input line I 7 having the highest priority. A High on the Enable Input (EI) will force all outputs to the inactive (High) state and allow new data to settle without producing erroneous information at the outputs. A Group Signal (GS ) output and an Enable Output (EO) are provided with the three data outputs. The GS is active-Low when any input is Low: this indicates when any input is active. The EO is active-Low when all inputs are High. Using the Enable Output along with the Enable Input allows priority encoding of N input signals. Both EO and GS are active-High when the Enable Input is High. PIN CONFIGURATION 107 VCC EO GS EI 98GND A 0 SF00181 TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74F148 6.0ns 23mA

ORDERING INFORMATION

VCC = 5V ±10%, Tamb = 0°C to +70°C PKG DWG # 16-pin plastic DIP N74F148N SOT38-4 16-pin plastic SO N74F148D SOT109-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW I1 – I7 Priority inputs (active Low) 1.0/2.0 20µA/1.2mA I0 Priority input (active Low) 1.0/1.0 20µA/0.6mA EI Enable input (active Low) 1.0/2.0 20µA/1.2mA EO Enable output (active Low) 50/33 1.0mA/20mA GS Group select output (active Low) 50/33 1.0mA/20mA A0 – A2 Address outputs (active Low) 50/33 1.0mA/20mA NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.

Philips Semiconductors Product specification 74F1488-input priority encoder March 1, 1990 3 LOGIC SYMBOL A0 A1 A2 97 6VCC = Pin 16 GND = Pin 8 SF00182 I0 I1 I2 I4 I5 I6 I7I3 10 11 12 13 1 2 3 4 EO GS 5E I IEC/IEEE SYMBOL 10/Z10 5/Z15 11/Z11 6/Z16 3/Z13 2/Z12 7/Z17 EN = α /V18 SF00183 1 4/Z14 HPRI/BIN 0 α 1 α 2 α α ≥ 110 LOGIC DIAGRAM VCC = Pin 16 GND = Pin 8 SF00184 GS EO EI 4 3 2 1 13 12 11 10 I6I 5I 4I 3I 2I 1I 0

Philips Semiconductors Product specification 74F1488-input priority encoder March 1, 1990 4 FUNCTION TABLE INPUTS OUTPUTS EI I0 I1 I2 I3 I4 I5 I6 I7 GS A 0 A 1 A 2 EO H X X X X X X X X H H H H H L HHH HHHHHH HHHL L X X X X X X X L L L L L H L XXX XXXLHL HLLH L XXX XXLHHL LHLH L XXX XLHHHL HHLH L X X X L H H H H L L L H H L XXL HHHHHL HLHH L XLH HHHHHL LHHH L L H H H H H H H L H H H H H = High voltage level L = Low voltage level X = Don’t care APPLICATION SF0018516-Input Priority Encoder A0 A1 A2 I0 I1 I2 I4 I5 I6 I7I3 EI GS EO LSB A0 A1 A2 I0 I1 I2 I4 I5 I6 I7I3 EI GS EO ENABLE MSB A0A 1A 2A 3 FLAG

Philips Semiconductors Product specification 74F1488-input priority encoder March 1, 1990 5 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 PARAMETER RATING UNIT VCC Supply voltage –0.5 to +7.0 V VIN Input voltage –0.5 to +7.0 V IIN Input current –30 to +5 mA VOUT Voltage applied to output in High output state –0.5 to VCC V IOUT Current applied to output in Low output state 40 mA Tamb Operating free-air temperature range 0 to +70 °C Tstg Storage temperature range –65 to +150 °C RECOMMENDED OPERATING CONDITIONS SYMBOL PARAMETER LIMITS UNITSYMBOL PARAMETER MIN NOM MAX UNIT VCC Supply voltage 4.5 5.0 5.5 V VIH High-level input voltage 2.0 V VIL Low-level input voltage 0.8 V IIK Input clamp current –18 mA IOH High-level output current –1 mA IOL Low-level output current 20 mA Tamb Operating free-air temperature range 0 +70 °C DC ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range unless otherwise noted.) SYMBOL PARAMETER TEST CONDITIONS 1 LIMITS UNITSYMBOL PARAMETER TEST CONDITIONS 1 MIN TYP 2 MAX UNIT VO High level output voltage VCC = MIN, VIL = MAX ±10%V CC 2.5 VVOH High-level output voltage VIH = MIN, IOH = MAX ±5%V CC 2.7 3.4 V VO Low level output voltage VCC = MIN, VIL = MAX ±10%V CC 0.30 0.50 VVOL Low-level output voltage VIH = MIN, IOL = MAX ±5%V CC 0.30 0.50 V VIK Input clamp voltage VCC = MIN, II = IIK –0.73 –1.2 V II Input current at maximum input voltageVCC = MAX, VI = 7.0V 100 µA IIH High-level input current VCC = MAX, VI = 2.7V 20 µA I Low level input current VCC = MAX V =05 V –0.6 mA IIL Low-level input current I1 – I7, EI VCC = MAX , VI = 0.5V –1.2 mA IOS Short-circuit output current3 VCC = MAX –60 –150 mA ICC Supply current (total)4 VCC = MAX 23 35 mA 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 = 25°C. 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. 4. To measure ICC , outputs must be open, VIN on all inputs = 4.5V.

Philips Semiconductors Product specification 74F1488-input priority encoder March 1, 1990 6 AC ELECTRICAL CHARACTERISTICS LIMITS SYMBOL PARAMETER TEST CONDITION VCC = +5.0V Tamb = +25°C C L = 50pF, RL = 500Ω VCC = +5.0V ± 10% Tamb = 0°C to +70°C C L = 50pF, RL = 500Ω UNIT MIN TYP MAX MIN MAX tPLH tPHL Propagation delay In to An Waveform 2 3.5 3.5 6.0 6.0 9.0 9.0 3.5 3.5 10.0 10.0 ns tPLH tPHL Propagation delay I n to EO Waveform 1 1.5 1.5 3.0 2.5 6.5 6.5 1.5 1.5 7.5 7.5 ns tPLH tPHL Propagation delay I n to GS Waveform 2 2.0 2.0 4.0 4.0 8.0 8.0 2.0 2.0 9.0 9.0 ns tPLH tPHL Propagation delay EI to An Waveform 2 3.5 3.0 6.0 5.5 8.5 8.0 3.5 3.0 9.5 9.0 ns tPLH tPHL Propagation delay EI to GS Waveform 2 2.5 3.0 4.5 5.5 7.0 7.5 2.5 3.0 8.0 8.5 ns tPLH tPHL Propagation delay EI to EO Waveform 2 3.0 3.5 5.0 5.0 7.0 7.5 3.0 3.5 8.0 9.0 ns AC WAVEFORMS For all waveforms, VM = 1.5V. VMVM VMVM An, EO, GS In, EI tPHL tPLH SF00186 Waveform 1. For Inverting Outputs VMVM VMVM An, EO, GS In, EI tPHL tPLH SF00187 Waveform 2. For Non-Inverting Outputs TEST CIRCUIT AND WAVEFORMS tw 90% VM 10% 90% VM 10% 90% VM 10% 90% VM 10% NEGATIVE PULSE POSITIVE PULSE tw AMP (V) tTHL (tf ) INPUT PULSE REQUIREMENTS rep. rate tw tTLH tTHL 1MHz 500ns 2.5ns 2.5ns Input Pulse Definition VCC family 74F D.U.T.PULSE GENERATOR R LC LR T VIN VOUT Test Circuit for Totem-Pole Outputs DEFINITIONS: R L = Load resistor; see AC ELECTRICAL CHARACTERISTICS for value. C L = Load capacitance includes jig and probe capacitance; see AC ELECTRICAL CHARACTERISTICS for value. R T = Termination resistance should be equal to ZOUT of pulse generators. tTHL (tf ) tTLH (tr ) tTLH (tr ) AMP (V) amplitude 3.0V 1.5V VM SF00006

Philips Semiconductors Product specification 74F1488-input priority encoder

1990 Mar 01 7

DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4

Philips Semiconductors Product specification 74F1488-input priority encoder

1990 Mar 01 8

SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

Philips Semiconductors Product specification 74F1488-input priority encoder

1990 Mar 01 9

Philips Semiconductors Product specification 74F1488-input priority encoder yyyy mmm dd 10 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  Copyright Philips Electronics North America Corporation 1998 All rights reserved. Printed in U.S.A. print code Date of release: 10-98 Document order number: 9397-750-05078 /C0109 /C0110 /C0114 Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Production 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. Data sheet status [1] Please consult the most recently issued datasheet before initiating or completing a design.