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M74HC148
8 TO 3 LINE PRIORITY ENCODER
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HIGH SPEED: tPD = 16ns (TYP.) at VCC = 6V LOW POWER DISSIPATION: ICC = 4A(MAX.) at TA=25C HIGH NOISE IMMUNITY: VNIH = V NIL = 28 % VCC (MIN.) SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 4mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL WIDE OPERATING VOLTAGE RANGE: VCC (OPR) = 2V to 6V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 148
DIP
SOP
TSSOP
ORDER CODES
PACKAGE DIP SOP TSSOP TUBE M74HC148B1R M74HC148M1R T&R M74HC148RM13TR M74HC148TTR
DESCRIPTION The M74HC148 is an high speed CMOS 8 TO 3 LINE PRIORITY ENCODER fabricated with silicon gate C2MOS technology. The M74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO)
has been provided to allow octal expansion without the need for external circuitry. Data inputs are active at the low logic level. All inputs are equipped with protection circuits against static discharge and transient excess voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
July 2001
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M74HC148
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 9, 7, 6 10, 11, 12, 13, 1, 2, 3, 4 15 5 14 8 16 SYMBOL A0 to A2 0 to 7 EO EI GS GND VCC NAME AND FUNCTION Data Outputs Data Inputs Enable Output Enable Input Priority Flag Output Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS E1 H L L L L L L L L L 0 X H X X X X X X X L 1 X H X X X X X X L H 2 X H X X X X X L H H 3 X H X X X X L H H H 4 X H X X X L H H H H 5 X H X X L H H H H H 6 X H X L H H H H H H 7 X H L H H H H H H H A2 H H L L L L H H H H A1 H H L L H H L L H H OUTPUTS A0 H H L H L H L H L H GS H H L L L L L L L L E0 H L H H H H H H H H
X : Don't Care
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
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M74HC148
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO IIK IOK IO PD Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Power Dissipation Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 20 20 25 50 500(*) -65 to +150 300 Unit V V V mA mA mA mA mW C C
ICC or IGND DC VCC or Ground Current
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied (*) 500mW at 65 C; derate to 300mW by 10mW/C from 65C to 85C
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VI VO Top tr, tf Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time VCC = 2.0V VCC = 4.5V VCC = 6.0V Parameter Value 2 to 6 0 to VCC 0 to VCC -55 to 125 0 to 1000 0 to 500 0 to 400 Unit V V V C ns ns ns
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M74HC148
DC SPECIFICATIONS
Test Condition Symbol Parameter VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 4.5 6.0 VOL Low Level Output Voltage 2.0 4.5 6.0 4.5 6.0 II ICC Input Leakage Current Quiescent Supply Current 6.0 6.0 IO=-20 A IO=-20 A IO=-20 A IO=-4.0 mA IO=-5.2 mA IO=20 A IO=20 A IO=20 A IO=4.0 mA IO=5.2 mA VI = VCC or GND VI = VCC or GND TA = 25C Min. 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.18 5.68 2.0 4.5 6.0 4.31 5.8 0.0 0.0 0.0 0.17 0.18 0.1 0.1 0.1 0.26 0.26 0.1 4 1.9 4.4 5.9 4.13 5.63 0.1 0.1 0.1 0.33 0.33 1 40 Typ. Max. Value -40 to 85C Min. 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 4.10 5.60 0.1 0.1 0.1 0.40 0.40 1 80 A A V V Max. -55 to 125C Min. 1.5 3.15 4.2 0.5 1.35 1.8 Max. V Unit
VIH
High Level Input Voltage Low Level Input Voltage High Level Output Voltage
VIL
V
VOH
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M74HC148
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6ns)
Test Condition Symbol Parameter VCC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 TA = 25C Min. Typ. 30 8 7 60 19 16 60 19 16 40 14 12 40 14 12 40 14 12 Max. 75 15 13 150 30 26 150 30 26 115 23 20 115 23 20 115 23 20 Value -40 to 85C Min. Max. 95 19 16 190 38 32 190 38 32 145 29 25 145 29 25 145 29 25 -55 to 125C Min. Max. 110 22 19 225 45 38 225 45 38 175 35 30 175 35 30 175 35 30 ns Unit
tTLH tTHL Output Transition Time tPLH tPHL Propagation Delay Time (In - A0, A1, A2) tPLH tPHL Propagation Delay Time (In - EO, GS) tPLH tPHL Propagation Delay Time ( EI -EO) tPLH tPHL Propagation Delay Time (EI -GS) tPLH tPHL Propagation Delay Time (EI - A0, A1, A2)
ns
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CAPACITIVE CHARACTERISTICS
Test Condition Symbol Parameter VCC (V) 5.0 5.0 TA = 25C Min. Typ. 5 60 Max. 10 Value -40 to 85C Min. Max. 10 -55 to 125C Min. Max. 10 pF pF Unit
CIN CPD
Input Capacitance Power Dissipation Capacitance (note 1)
1) CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC
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M74HC148
TEST CIRCUIT
CL = 50pF or equivalent (includes jig and probe capacitance) RT = ZOUT of pulse generator (typically 50)
WAVEFORM 1: PROPAGATION DELAY TIMES ,FOR INVERTING AND NON INVERTING OUTPUTS (f=1MHz; 50% duty cycle)
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M74HC148
TYPICAL APPLICATION
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M74HC148
Plastic DIP-16 (0.25) MECHANICAL DATA
mm. DIM. MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 TYP MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 TYP. MAX. inch
P001C
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M74HC148
SO-16 MECHANICAL DATA
DIM. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 8 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm. MIN. TYP MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.003 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010
PO13H
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M74HC148
TSSOP16 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 4.9 6.2 4.3 5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 5.1 6.6 4.48 0.002 0.031 0.007 0.004 0.193 0.244 0.169 0.197 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0089 0.201 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
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M74HC148
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom (c) http://www.st.com
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